Add examples: ADC, Digital-out, Fix Digital-in; Add shift_register class

.gitignore

@@ -1,6 +1,5 @@
 #temporary
 datasheets/
-pi-interface-board_v1.0/export/
 export/
 pcb2gcode/
 cad/import
@@ -10,10 +9,12 @@ cad/import
 \#auto_saved_files\#
 *.lck
 _autosave-*
+fp-info-cache
 
 *.kicad_sch-back
 *.bak
 *.kicad_sch-bak
+*.kicad_prl
 
 #drawio
 *.bkp

README.md

@@ -1,149 +1,197 @@
-A Raspberry Pi-compatible PCB that extends the GPIO header with protected I/O, relays, and various features for versatile use in prototyping and project development.
+# Raspberry Pi Extension board
+
+A custom PLC-like system based on the Raspberry Pi.  
+With a custom interface board, a Raspberry Pi is extended with protected I/O, bus systems, analog inputs, and Relay or PWM outputs. All components, including a display, are housed in a custom-designed enclosure.  
+  
+The project is intended for versatile use in prototyping and project development.
+
+
 ---
 
-# Notes
 
-## interface-board issues noticed when soldering
-- [x] digital in TVS diode footprint: dia is larger -> rotate one/space + 1.5mm drill
-- [x] make diodes pwm larger hole
-- [x] make pitch buzzer larger
-- 
-
-## interface-board issues at first test
-- analog leds vs terminal: CH0 and CH1 swapped (first, second terminal)
--> renamed nets and added notes 
-- analog leds vs terminal: CH2 and CH3 swapped (third fourth terminal)
-- 
-- CH1 and CH7 led on
+### Photo of all hardware components
+<p align="center">
+  <img src="doc/photos/all-components.jpg" alt="All Components (Disassembled)" width="75%"/>
+</p>
 
 
-## Power supply board 
-FIXME: barrel-connector wrong polarity 
--> change housing (connected via wires)
--> fix layout, schematic
+---
 
 
-
-# RPI Specs (Zero, 3+)
-- Available (old) Pi: Raspberry Pi 2 Model B v1.1 
-- GPIO
-  - Low: 0.9V
-  - High: 1.6V
-  - Input current: 5uA
-  - Input capacitance: 5pF
-  - Output Current +-17mA
-  - Pullup / Pulldown 50-65k
-- EEPROM GPIO0 GPIO1, leave unused
+# Repository Content
+- **KiCad Projects**: 3 KiCad projects with schematics and PCB layouts for the custom PCBs created.
+- **Housing**: Custom enclosure design for PCBs and Raspberry Pi created in FreeCAD.
+- **Software/Firmware**: Python scripts for operating and testing the PCB features (WIP).
 
 
-
-# Feature Ideas
-- [x] Temperature control
-  - fan
-    - auto turn on
-      - temp sensor
-    - ~~turn on via gpio~~
+---
 
 
-## Supply
-- Input protection
-  - [x] TVS
-  - [x] reverse polarity (polyfuse will trigger)
-  - [x] Fuse (5A polyfuse)
-  - [x] buffer
-- [x] Pass through power supply
-- [x] 3.3V, 5V, 12V, 24V Regulator
+# Features Overview
+This project provides:
+- Protected GPIO I/O for Raspberry Pi.
+- Various analog inputs.
+- Flexible power supply options (3.3 V, 5 V, -5 V, 12 V, 24 V outputs).
+- Relay and MOSFET control.
+- Integrated LEDs for status indication.
+- RS485, I2C, SPI, and UART bus communication.
 
-- [x] power by barrel connector (24V 5A)
-- ~~power by usb~~ [not allowed]
-  - ~~Switch between power by USB or power supply?~~
-- ~~power by battery~~ [dropped]
-  - liion cell connector
-  - BMS / charge controller
-  - measure battery voltage
-  - USB charging port
+Detailed features of each PCB are described in the respective sections below.
+
+---
+
+# Designed PCBs
+
+## 1. **Raspberry Pi Interface Board**
+This board connects to the Raspberry Pi via a 40-pin ribbon cable and provides protected GPIO extensions and versatile input/output features.
+
+### Photo
+<img src="doc/photos/rpi-interface-board.jpg" alt="Raspberry Pi Interface Board" width="80%"/>
+
+### Features
+**Inputs**:
+- **8x Digital Inputs**:
+  - Wide continuous voltage range (-1.7 V to 120 V), idea: compatible with 3 V and 24 V devices.
+  - TVS diodes for ESD and spike protection.
+  - Reverse polarity protection.
+  - Isolated with optocouplers.
+  - Optional low-pass filters (toggle via DIP switches).
+
+- **8x Analog Inputs**:
+  - Different fixed range inputs:
+    - 2x 0 - 3.3 V.
+    - 2x 0 - 5 V.
+    - 1x 0 - 12 V.
+    - 1x 0 - 24 V.
+    - 2x 0 - 20 mA.
+  - Overvoltage protection with clamping diodes.
+  - Optional low-pass filters (toggle via DIP switches).
+
+**Outputs**:
+- 1x onboard buzzer.
+- 2x 16 A relays.
+- 2x high-power MOSFETs (N-channel, max 55 V, 33 A continuous, 160 A pulsed).
+- 8x digital outputs (via shift register):
+  - Low-power (30 mA push-pull) and high-power (500 mA open-drain) outputs.
+  - Buzzer and relays connected to channels 6-8, with enable/disable switches.
+  - Note: Outputs are **not short-circuit proof**.
+
+**General**:
+- WAGO spring-loaded terminals for easy wiring.
+- JST connectors for external LEDs for all inputs and outputs to indicate the current pin state.
+
+**Bus Communication**:
+- RS485 (TVS protection, idle pull-up/pull-down, 120 Ω terminator).
+- UART (unprotected).
+- I2C (TVS diodes, 2.2 kΩ pull-ups).
+- SPI (unprotected).
+Note: Either RS485 or UART can be used at the same time (select with jumpers).
+
+### Schematic and Layout
+<p align="center">
+  <a href="pi-interface-board_v1.0/export/schematic_interface-board.pdf">
+    <img src="pi-interface-board_v1.0/export/schematic_interface-board.svg" width="49%" alt="Schematic"/>
+  </a>
+  <img src="pi-interface-board_v1.0/export/layout_interface-board.png" width="49%" alt="PCB Layout"/>
+</p>
 
 
-## IO
-- Input
-  - GPIO
-  - [x] wide voltage range (-1.7 to 120V)
-  - [x] TVS
-  - [x] reverse polarity (-1.73V max)
-  - [x] Low pass filter
-  - [x] Optocoupler input
-  - [x] ADC
-    - external IC
-    - ~~multiplexer?~~
-    - protection
-    - scale input voltage
-      - fixed inputs: 24V 12V 5V 3.3V
-      - 20mA input
-      - ~~trim potentiometer?~~
-- Output
-  - [x] Relay
-  - [x] Mosfet
-  - [x] Optocoupler output
-  - [ ] GPIO with over current protection
-  - [ ] GPIO level shift (24V output)
-  - [x] PWM pins
-  - [x] shift register
-  - [ ] DAC
-
-- [x] LEDS indicate I/O state
-- [ ] Testpoints
-- [x] ESD protection (tvs diodes uart, i2c...)
+---
 
 
-## Bus
-- [x] UART/RS485
-- [ ] RS232 Connector
-- [x] I2C Pullup
-- [x] SPI
-- [ ] CAN
-- ~~Serial to usb (if Arduino)~~
-- ~~OWB default GPIO4~~
+## 2. **Power Supply Board**
+Creates different voltages from supplied 24 V. Supply for the Raspberry Pi interface board as well as several terminals for variable use (connect sensors, devices, etc., to the housing).
+
+### Photo
+<img src="doc/photos/power-supply-board.jpg" alt="Power Supply Board" width="60%"/>
+
+### Features
+**Input**:
+- 24 V 5 A barrel plug.
+- 5 A self-resetting polyfuse.
+- Reverse polarity protection.
+
+**Output**:
+- 3.3 V, 3 A (buck converter).
+- 5 V, 5 A (buck converter).
+- -5 V, 20 mA (charge pump).
+- 12 V, 3 A (buck converter).
+- 24 V (supply voltage filtered).
+
+**Fan Control**:
+- 2x connector for 10 kΩ NTC.
+- Threshold adjustable (trimmer potentiometer).
+- Hysteresis adjustable (trimmer potentiometer).
+- Select between 5 V or 12 V fan.
+
+**General**:
+- Spring-loaded terminals for each voltage.
+- Combined internal terminals for all voltages.
+
+### Schematic and Layout
+<p align="center">
+  <a href="power-supply-board_v1.0/export/schematic_power-supply.pdf">
+    <img src="power-supply-board_v1.0/export/schematic_power-supply.svg" width="55%" alt="Schematic"/>
+  </a>
+  <img src="power-supply-board_v1.0/export/layout_power-supply.png" width="44%" alt="PCB Layout"/>
+</p>
+
+---
+
+## 3. **LED Boards**
+Small PCBs with LEDs, resistors, and mounting holes for housing indicators.
+
+### Photo
+<img src="doc/photos/led-boards.jpg" alt="LED Boards" width="60%"/>
+
+### Boards
+1. 2x 5 mm LEDs for relays.
+2. 2x 5 mm LEDs for PWM outputs.
+3. 8x 3 mm yellow LEDs for analog inputs.
+4. 8x 3 mm orange LEDs for digital inputs.
+5. 8x 3 mm red LEDs for digital outputs.
+
+### Schematic and Layout
+<p align="center">
+  <a href="led-boards_v0.1/export/schematic_led-boards.pdf">
+    <img src="led-boards_v0.1/export/schematic_led-boards.svg" width="48%" alt="Schematic"/>
+  </a>
+  <img src="led-boards_v0.1/export/layout_led-boards.png" width="51%" alt="PCB Layout"/>
+</p>
 
 
-## UI
-- Input [dropped]
-  - Buttons
-  - DIP switches?
-  - Temperature sensor
-  - Encoder
-  - Potentiometer
-- Output
-  - [ ] Display [RPI display pending]
-  - [x] Buzzer
-  - [x] LEDS
+---
 
 
-## Mechanical
-- [x] Barrel plug (24V 3A supply)
-- ~~Screw terminals~~
-- [x] spring loaded?
-- ~~pass through all pins?~~
-
-## Housing
-- RPI ports
--  banana sockets for power out 
--  screw terminal exposed
-- buttons, leds: need to open up?
--  BNC? []
+# Software/Firmware
+Python code for operating the extension PCBs (e.g., GPIO pins, shift registers, ADC, and bus communication). This section is a work in progress (WIP), and example scripts will be added as development continues.
 
 
-## Other
-- Extension board with multiplexer
-- Breadboard compatible?
-- SD Card
-- ~~Onboard MCU for standalone use?~~
-- ~~separate bought MCU via i2c  for additional GPIO, DAC, ADC in one~~
+---
 
 
-## Questions
-- what analog input ranges (Voltage, Count)
-- RS232  RS485  SPI,  IIC  actually necessary? examples
-- CAN to second SPI?
-- 8x shift register outputs, 0.5A open drain or 7mA tristate
-- 2x PWM 30A enough?
-- max used PWM freq? (drop opto if >80khz)
+# Housing
+Custom-designed enclosure includes:
+- Ports for Raspberry Pi.
+- Banana sockets for power outputs.
+- Exposed screw terminals.
+- Openings for buttons and LEDs.
+- Mounts for all PCBs and wiring.
+
+<img src="doc/graphics/3d-model_housing.png" width="80%" alt="3D Model"/>
+
+
+---
+
+
+# Dropped Features
+The following ideas were considered but not implemented:
+- UI Input Elements:
+  - Buttons, DIP switches, temperature sensors, encoders, or potentiometers.
+- USB or battery-powered operation:
+  - Battery packs with BMS and voltage measurement.
+  - Li-ion cell holders.
+- Analog output (DAC)
+- More bus systems
+  - RS232 Interface
+  - CAN Interface

led-boards_v0.1/led-boards_v0.1.kicad_prl

@@ -1,82 +0,0 @@
-{
-  "board": {
-    "active_layer": 44,
-    "active_layer_preset": "",
-    "auto_track_width": false,
-    "hidden_netclasses": [],
-    "hidden_nets": [],
-    "high_contrast_mode": 0,
-    "net_color_mode": 1,
-    "opacity": {
-      "images": 0.6,
-      "pads": 1.0,
-      "tracks": 1.0,
-      "vias": 1.0,
-      "zones": 0.6000000238418579
-    },
-    "selection_filter": {
-      "dimensions": false,
-      "footprints": false,
-      "graphics": false,
-      "keepouts": false,
-      "lockedItems": false,
-      "otherItems": false,
-      "pads": false,
-      "text": true,
-      "tracks": false,
-      "vias": false,
-      "zones": false
-    },
-    "visible_items": [
-      0,
-      1,
-      2,
-      3,
-      4,
-      5,
-      8,
-      9,
-      10,
-      11,
-      13,
-      15,
-      16,
-      17,
-      18,
-      19,
-      20,
-      21,
-      22,
-      23,
-      24,
-      25,
-      26,
-      27,
-      28,
-      29,
-      30,
-      32,
-      33,
-      34,
-      35,
-      36,
-      39,
-      40
-    ],
-    "visible_layers": "ffeffff_ffffffff",
-    "zone_display_mode": 0
-  },
-  "git": {
-    "repo_password": "",
-    "repo_type": "",
-    "repo_username": "",
-    "ssh_key": ""
-  },
-  "meta": {
-    "filename": "led-boards_v0.1.kicad_prl",
-    "version": 3
-  },
-  "project": {
-    "files": []
-  }
-}

pi-interface-board_v1.0/2x-LED-common-anode_external.kicad_sch

@@ -224,6 +224,17 @@
 		)
 		(uuid "ff8e5d9b-ee46-4657-a2a4-813fdfa4d6f5")
 	)
+	(text "Note: Legacy hierachial sheet\nThis was outsourced to separate pcb project \n\"led-boards_v0.1\""
+		(exclude_from_sim no)
+		(at 40.132 46.228 0)
+		(effects
+			(font
+				(size 2 2)
+			)
+			(justify left)
+		)
+		(uuid "d216fd8a-355b-44d9-82c9-ccddba031600")
+	)
 	(hierarchical_label "LED1"
 		(shape input)
 		(at 48.26 66.04 180)

pi-interface-board_v1.0/8x-LED-common-anode_external.kicad_sch

@@ -438,6 +438,17 @@
 		)
 		(uuid "f0f511aa-d379-4ed6-b9f1-8d300b8f7a64")
 	)
+	(text "Note: Legacy hierachial sheet\nThis was outsourced to separate pcb project \n\"led-boards_v0.1\""
+		(exclude_from_sim no)
+		(at 70.612 38.862 0)
+		(effects
+			(font
+				(size 2 2)
+			)
+			(justify left)
+		)
+		(uuid "0f424e6d-836c-4e21-bd19-f1b997455939")
+	)
 	(text "Connector for external LED board"
 		(exclude_from_sim no)
 		(at 75.692 48.768 0)

pi-interface-board_v1.0/8x-LED-common-cathode_external.kicad_sch

@@ -449,6 +449,17 @@
 		)
 		(uuid "3bb6e485-1926-4a9c-a057-6e133e2e6a90")
 	)
+	(text "Note: Legacy hierachial sheet\nThis was outsourced to separate pcb project \n\"led-boards_v0.1\""
+		(exclude_from_sim no)
+		(at 72.136 39.624 0)
+		(effects
+			(font
+				(size 2 2)
+			)
+			(justify left)
+		)
+		(uuid "e0c12a11-96f5-42ef-8716-5299f12502f0")
+	)
 	(hierarchical_label "LED8"
 		(shape input)
 		(at 83.82 76.2 180)

pi-interface-board_v1.0/pi-interface-board_v1.0.kicad_pcb

@@ -4950,7 +4950,7 @@
 			)
 		)
 		(property "Value" "8x Digital out (opendrain + push-pull)"
-			(at -0.3018 8.937 0)
+			(at 0.0899 12.012189 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "39efeb16-8f22-42e4-adcb-5ffce1d70abb")
@@ -8741,7 +8741,7 @@
 			)
 		)
 		(property "Value" "low power supply"
-			(at 4.0412 -4.4052 90)
+			(at 3.737811 -4.1491 90)
 			(layer "F.Fab")
 			(uuid "88417c03-196b-4558-8591-f9f627c2ced8")
 			(effects
@@ -14082,7 +14082,7 @@
 			)
 		)
 		(property "Value" "TVS 102V  1,5KE120A"
-			(at 15.194 0.127 -90)
+			(at 5.073189 -3.5979 90)
 			(layer "F.Fab")
 			(uuid "9c2e8d74-937c-4530-876a-b6e559d8493d")
 			(effects
@@ -16782,6 +16782,7 @@
 		(property "Value" "TVS 102V  1,5KE120A"
 			(at 15.067 0.508 -90)
 			(layer "F.Fab")
+			(hide yes)
 			(uuid "099b7173-04a9-49a8-ac5f-e0fe979b9c2a")
 			(effects
 				(font
@@ -17463,7 +17464,7 @@
 			)
 		)
 		(property "Value" "8x digital input - wago-734-168"
-			(at 11.968 10.8913 0)
+			(at 13.0089 13.824489 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "cb2eb570-95aa-471c-87db-885389e8efb0")
@@ -25448,7 +25449,7 @@
 			)
 		)
 		(property "Value" "UART"
-			(at 1.778 12.446 0)
+			(at 2.3711 10.080811 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "9dc3392c-0e41-4b4d-9eef-c9c8f2f3e8a4")
@@ -26795,7 +26796,7 @@
 			)
 		)
 		(property "Value" "RS485"
-			(at 1.996 12.0155 0)
+			(at 2.2531 9.972811 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "ee6831ef-02f8-48c5-88c7-39f9d5808fc4")
@@ -29124,7 +29125,7 @@
 			)
 		)
 		(property "Value" "TVS 102V  1,5KE120A"
-			(at 14.986 0 -90)
+			(at 6.119189 -2.0709 -90)
 			(layer "F.Fab")
 			(uuid "90659efd-3c7f-4008-af88-bb8795a4ec78")
 			(effects
@@ -32265,7 +32266,7 @@
 			)
 		)
 		(property "Value" "Relay2"
-			(at 1.778 6.731 90)
+			(at 0.442811 6.9849 90)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "8063190c-c18e-4ed2-a340-cfee8494b126")
@@ -32426,7 +32427,7 @@
 			)
 		)
 		(property "Value" "PWM1"
-			(at 1.778 6.731 90)
+			(at -0.449189 6.6069 90)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "55e059d0-735c-41ee-b81d-17cd535725bc")
@@ -35968,7 +35969,7 @@
 			)
 		)
 		(property "Value" "PWM2"
-			(at 1.778 6.731 90)
+			(at -0.449189 6.6069 90)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "2fbfd3e1-99a7-4801-8efc-370b15c760b4")
@@ -36130,7 +36131,7 @@
 			)
 		)
 		(property "Value" "SPI / unrpotected GPIO"
-			(at 8.89 12.065 0)
+			(at 9.4151 11.180811 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "e3c7878b-2838-4411-a975-1710a7738dbb")
@@ -41021,7 +41022,7 @@
 		(descr "Buzzer, D12.2mm height 6.5mm, https://product.tdk.com/info/en/catalog/datasheets/piezoelectronic_buzzer_ps_en.pdf")
 		(tags "buzzer")
 		(property "Reference" "BZ1"
-			(at 2.667 -4.1966 90)
+			(at 1.293189 -2.6539 90)
 			(layer "F.SilkS")
 			(uuid "7411676d-d7bb-4a4c-b8ea-a377d28ae76b")
 			(effects
@@ -41032,7 +41033,7 @@
 			)
 		)
 		(property "Value" "Buzzer"
-			(at 2.3114 2.2804 90)
+			(at 0.318189 2.5461 90)
 			(layer "F.Fab")
 			(uuid "0457f52e-7c9f-4197-b738-2ed19aa5872c")
 			(effects
@@ -41151,17 +41152,6 @@
 			(layer "F.Fab")
 			(uuid "147fdaf6-f864-4f14-8a8c-b648f80b9515")
 		)
-		(fp_text user "${REFERENCE}"
-			(at 2.5 -2.43 90)
-			(layer "F.Fab")
-			(uuid "72669b49-e1f8-4d24-8252-3955e759ce74")
-			(effects
-				(font
-					(size 1 1)
-					(thickness 0.15)
-				)
-			)
-		)
 		(pad "1" thru_hole rect
 			(at -0.75 0 270)
 			(size 2 2)
@@ -41214,7 +41204,7 @@
 			)
 		)
 		(property "Value" "I2C"
-			(at 7.254 11.938 0)
+			(at 7.470219 11.103811 0)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "8967fad9-eba0-4005-aa22-1a6387592397")
@@ -47680,6 +47670,7 @@
 		(property "Value" "TVS 102V  1,5KE120A"
 			(at 15.1922 0.5228 90)
 			(layer "F.Fab")
+			(hide yes)
 			(uuid "4ea3e6ce-3fe3-4739-9ce3-a9be1eee0387")
 			(effects
 				(font
@@ -48659,7 +48650,7 @@
 			)
 		)
 		(property "Value" "Relay1"
-			(at 1.778 6.731 90)
+			(at 0.270311 7.0849 90)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "be10c898-0964-45df-bd80-72ac88a01f2f")
@@ -57751,6 +57742,84 @@
 			(justify left bottom mirror)
 		)
 	)
+	(gr_text "GND, RX, TX"
+		(at 127.65 24.8 0)
+		(layer "Cmts.User")
+		(uuid "01924b0c-28a2-411b-9b54-e7060cd43987")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "GPIO-18 (PWM0)"
+		(at 239.7 67.7 90)
+		(layer "Cmts.User")
+		(uuid "11207d2b-7cfd-496e-81ff-cb2ea2707c53")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "Shift-Register CH7"
+		(at 240.1 95.05 90)
+		(layer "Cmts.User")
+		(uuid "21062799-c14d-4ad2-bdf2-aaef092aaffc")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "top row: push-pull\nbot row: power open drain"
+		(at 207.7 137.6 0)
+		(layer "Cmts.User")
+		(uuid "386bf708-dd36-4dcd-9ac2-0aa153c758fc")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "power connector:\n12V, 5V, 3V3, GND"
+		(at 231.15 75.925 0)
+		(layer "Cmts.User")
+		(uuid "69455f21-a69d-4037-9271-d70f0e93e2f0")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "B, A, GND"
+		(at 160.05 24.9 0)
+		(layer "Cmts.User")
+		(uuid "7f209c32-1ac9-4b76-ad1d-602f0f5d4efb")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
 	(gr_text "CH1, CH0, CH3, CH2, CH5, CH4, CH7, CH6"
 		(at 71.7691 140.670811 0)
 		(layer "Cmts.User")
@@ -57764,8 +57833,21 @@
 			(justify left bottom)
 		)
 	)
-	(gr_text "Notes Analog led connector:\nconnector order does not \nmatch terminal order\n-> see Net names for mapping \n     T1 = terminal pin 1"
-		(at 21.7311 88.854811 0)
+	(gr_text "5V, -5V, 3V3, GND"
+		(at 65.75 97.125 90)
+		(layer "Cmts.User")
+		(uuid "83ecd638-69c0-47e9-a66d-66da2de73189")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "Note Analog led connector:\nconnector order does not \nmatch terminal order\n-> see Net names for mapping \n     T1 = terminal pin 1"
+		(at 72.55 163.6 0)
 		(layer "Cmts.User")
 		(uuid "876718fc-16e2-48db-9246-164e057e8a52")
 		(effects
@@ -57777,8 +57859,34 @@
 			(justify left bottom)
 		)
 	)
-	(gr_text "Note Diodes digital input:\n Validate CCD diode direction\n Label differs (Anode Cathode swapped)"
-		(at 119.5211 155.656811 0)
+	(gr_text "TOP: GND, 3V3,  CH8, CH7, CH6, CH5, CH4, CH3, CH2, CH1\nBOT: COM, COM, CH8, CH7, CH6, CH5, CH4, CH3, CH2, CH1"
+		(at 166.65 142.85 0)
+		(layer "Cmts.User")
+		(uuid "8c9b7310-58e6-44e1-8f78-d9e457b22c13")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "5V, 3V3, GND, SCL, SDA"
+		(at 101.05 24.65 0)
+		(layer "Cmts.User")
+		(uuid "9164f0ed-eb52-4518-b103-9b4dfd0e20d5")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "Note Diodes digital input:\n Validate CCD diode direction\n Label differs for CCD Diodes\n refer Datasheet (Anode Cathode swapped)"
+		(at 120 161.25 0)
 		(layer "Cmts.User")
 		(uuid "9b206df4-3430-4b4d-8344-cb35122dc522")
 		(effects
@@ -57790,8 +57898,21 @@
 			(justify left bottom)
 		)
 	)
+	(gr_text "GND, 3V3, MISO, SCLK, MOSI, CE"
+		(at 75.1 24.65 0)
+		(layer "Cmts.User")
+		(uuid "a4a63654-1ecc-4a9e-8683-184a523c64ce")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
 	(gr_text "TODO:\n - spi terminal, traces on top as well"
-		(at 234.442 20.32 0)
+		(at 19.5 18.95 0)
 		(layer "Cmts.User")
 		(uuid "b0731196-9468-4af8-9d9e-e9be8f2bde8b")
 		(effects
@@ -57803,6 +57924,84 @@
 			(justify left bottom)
 		)
 	)
+	(gr_text "Buzzer: CH8"
+		(at 169.425 93.25 0)
+		(layer "Cmts.User")
+		(uuid "e3e35026-d627-470b-882c-95e320ed1890")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "Shift-Register CH6"
+		(at 240.1 123.85 90)
+		(layer "Cmts.User")
+		(uuid "e8a55e1f-2f88-4cb3-b6cc-b70bf18f9ed9")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "DIN1, DIN2, DIN3, DIN4, DIN5, DIN6, DIN7, DIN8"
+		(at 121.8 140.75 0)
+		(layer "Cmts.User")
+		(uuid "eeb8c6c2-e8e7-411c-b064-fa9479f38303")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "GPIO-12 (PWM0)"
+		(at 240.05 46.85 90)
+		(layer "Cmts.User")
+		(uuid "f3b331e9-f25a-44a2-a4cb-6ca2cd4d3674")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "GPIO: GND, 3V3, 19,    21,   20,   7"
+		(at 70.85 22.95 0)
+		(layer "Cmts.User")
+		(uuid "fd32d4a4-1695-4505-8153-dd317366d575")
+		(effects
+			(font
+				(size 0.9 0.9)
+				(thickness 0.2)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "GPIO-25, GPIO-16, GPIO-26, GPIO-13, GPIO-6, GPI-5, GPIO-22, GPIO-24"
+		(at 118.35 142.15 0)
+		(layer "Cmts.User")
+		(uuid "ff58db0e-8ae8-44c2-ad58-30ba922ec2e9")
+		(effects
+			(font
+				(size 0.7 0.7)
+				(thickness 0.15)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
 	(gr_text "Raspberry PI"
 		(at -69.765 64.662 0)
 		(layer "User.9")
@@ -57819,72 +58018,6 @@
 	(dimension
 		(type aligned)
 		(layer "User.4")
-		(uuid "0fa8cb26-99f2-4dd9-b410-8708c3e89659")
-		(pts
-			(xy 234.1031 41.130811) (xy 234.1031 61.450811)
-		)
-		(height -10.64)
-		(gr_text "20.3200 mm"
-			(at 243.5931 51.290811 90)
-			(layer "User.4")
-			(uuid "0fa8cb26-99f2-4dd9-b410-8708c3e89659")
-			(effects
-				(font
-					(size 1 1)
-					(thickness 0.15)
-				)
-			)
-		)
-		(format
-			(prefix "")
-			(suffix "")
-			(units 3)
-			(units_format 1)
-			(precision 4)
-		)
-		(style
-			(thickness 0.1)
-			(arrow_length 1.27)
-			(text_position_mode 0)
-			(extension_height 0.58642)
-			(extension_offset 0.5) keep_text_aligned)
-	)
-	(dimension
-		(type aligned)
-		(layer "User.4")
-		(uuid "ec75d1f1-157a-4784-9a44-a6b49de76454")
-		(pts
-			(xy 234.1001 124.950811) (xy 234.1001 94.851811)
-		)
-		(height 13.8434)
-		(gr_text "30.0990 mm"
-			(at 246.7935 109.901311 90)
-			(layer "User.4")
-			(uuid "ec75d1f1-157a-4784-9a44-a6b49de76454")
-			(effects
-				(font
-					(size 1 1)
-					(thickness 0.15)
-				)
-			)
-		)
-		(format
-			(prefix "")
-			(suffix "")
-			(units 3)
-			(units_format 1)
-			(precision 4)
-		)
-		(style
-			(thickness 0.1)
-			(arrow_length 1.27)
-			(text_position_mode 0)
-			(extension_height 0.58642)
-			(extension_offset 0.5) keep_text_aligned)
-	)
-	(dimension
-		(type aligned)
-		(layer "User.9")
 		(uuid "954a18dc-7947-48ba-98e7-91459ecdd8c4")
 		(pts
 			(xy 68.12315 31.779111) (xy 68.12315 134.446111)
@@ -57892,7 +58025,7 @@
 		(height 7.629049)
 		(gr_text "102.6670 mm"
 			(at 59.344101 83.112611 90)
-			(layer "User.9")
+			(layer "User.4")
 			(uuid "954a18dc-7947-48ba-98e7-91459ecdd8c4")
 			(effects
 				(font
@@ -57917,7 +58050,7 @@
 	)
 	(dimension
 		(type aligned)
-		(layer "User.9")
+		(layer "User.4")
 		(uuid "c9371d0a-6385-4c43-b9cd-e19e3403f7b5")
 		(pts
 			(xy 230.15515 134.446111) (xy 68.12315 134.446111)
@@ -57925,7 +58058,7 @@
 		(height -12.3487)
 		(gr_text "162.0320 mm"
 			(at 149.13915 145.644811 0)
-			(layer "User.9")
+			(layer "User.4")
 			(uuid "c9371d0a-6385-4c43-b9cd-e19e3403f7b5")
 			(effects
 				(font

pi-interface-board_v1.0/pi-interface-board_v1.0.kicad_prl

@@ -1,81 +0,0 @@
-{
-  "board": {
-    "active_layer": 0,
-    "active_layer_preset": "",
-    "auto_track_width": false,
-    "hidden_netclasses": [],
-    "hidden_nets": [],
-    "high_contrast_mode": 0,
-    "net_color_mode": 1,
-    "opacity": {
-      "images": 0.6,
-      "pads": 1.0,
-      "tracks": 1.0,
-      "vias": 1.0,
-      "zones": 0.7099999785423279
-    },
-    "selection_filter": {
-      "dimensions": false,
-      "footprints": false,
-      "graphics": false,
-      "keepouts": false,
-      "lockedItems": false,
-      "otherItems": false,
-      "pads": false,
-      "text": false,
-      "tracks": true,
-      "vias": false,
-      "zones": false
-    },
-    "visible_items": [
-      0,
-      1,
-      2,
-      3,
-      4,
-      5,
-      8,
-      9,
-      10,
-      11,
-      13,
-      15,
-      16,
-      17,
-      18,
-      19,
-      20,
-      21,
-      22,
-      23,
-      24,
-      25,
-      26,
-      27,
-      28,
-      29,
-      30,
-      32,
-      34,
-      35,
-      36,
-      39,
-      40
-    ],
-    "visible_layers": "fff7fff_ffffffff",
-    "zone_display_mode": 0
-  },
-  "git": {
-    "repo_password": "",
-    "repo_type": "",
-    "repo_username": "",
-    "ssh_key": ""
-  },
-  "meta": {
-    "filename": "pi-interface-board_v1.0.kicad_prl",
-    "version": 3
-  },
-  "project": {
-    "files": []
-  }
-}

power-supply-board_v1.0/power-supply-board_v1.0.kicad_pcb

@@ -4915,7 +4915,7 @@
 			)
 		)
 		(property "Value" "Fan"
-			(at 1.009962 6.24 180)
+			(at 0.889962 7.9 -90)
 			(layer "F.Fab")
 			(uuid "4d4df2c7-768a-440f-b24d-257e61a23141")
 			(effects
@@ -5362,7 +5362,7 @@
 			)
 		)
 		(property "Value" "TP 5V"
-			(at -4.4196 0.1016 0)
+			(at -5.374 0.205 0)
 			(layer "F.Fab")
 			(uuid "a0c561cd-f07b-449b-bdd1-95638dd33795")
 			(effects
@@ -6504,7 +6504,7 @@
 			)
 		)
 		(property "Value" "TP GND"
-			(at 0 2.33 0)
+			(at -5.674 -0.009 0)
 			(layer "F.Fab")
 			(uuid "f731c7b1-c8fe-4e90-ac69-cb625c88948a")
 			(effects
@@ -7243,7 +7243,7 @@
 			)
 		)
 		(property "Value" "TP TEMP"
-			(at 9.652 0.254 0)
+			(at 9.528 -0.432 0)
 			(layer "F.Fab")
 			(uuid "ed3680c0-c9ba-4169-a084-10cfa6173f52")
 			(effects
@@ -10050,7 +10050,7 @@
 			)
 		)
 		(property "Value" "TP BATT"
-			(at -5.2324 0.254 0)
+			(at -6.84 0.174 0)
 			(layer "F.Fab")
 			(uuid "5f62316e-74b6-43ed-bb58-25015d3a0537")
 			(effects
@@ -10306,7 +10306,7 @@
 			)
 		)
 		(property "Value" "2200uf"
-			(at -0.6096 2.579362 0)
+			(at -0.952 2.579362 0)
 			(layer "F.Fab")
 			(uuid "1f7d7bb5-f802-471e-8ae7-4e1a80563b95")
 			(effects
@@ -15778,7 +15778,7 @@
 			)
 		)
 		(property "Value" "low power supply"
-			(at 5 4.6 90)
+			(at 5.304 -17.46 -90)
 			(layer "F.Fab")
 			(uuid "1d2b2d9a-85f8-4869-9ad4-78ea70baaaa5")
 			(effects
@@ -16269,7 +16269,7 @@
 			)
 		)
 		(property "Value" "24V 6A Supply"
-			(at -19.9136 1.2954 0)
+			(at -15.187 0.642 90)
 			(layer "F.Fab")
 			(uuid "b5278e3f-7951-4c56-8683-37a8cd2cebf3")
 			(effects
@@ -20435,7 +20435,7 @@
 			)
 		)
 		(property "Value" "high power supply"
-			(at 5.1206 -3.456 0)
+			(at 5.165 -6.037 0)
 			(layer "F.Fab")
 			(uuid "d9ee3520-6870-4f5a-8c4c-ed027f9844b0")
 			(effects
@@ -20835,7 +20835,7 @@
 			)
 		)
 		(property "Value" "high power supply"
-			(at 5.5778 -3.5068 0)
+			(at 5.115 -21.832 0)
 			(layer "F.Fab")
 			(uuid "7e1d6e39-ec62-4779-b99d-5474369325c0")
 			(effects
@@ -24017,7 +24017,7 @@
 			)
 		)
 		(property "Value" "TS-NTC-103 10k"
-			(at 2.1444 -11.9634 0)
+			(at 1.215 -11.968 0)
 			(layer "F.Fab")
 			(uuid "b5f74fe3-90ad-4c5b-8181-6c82cc7709ee")
 			(effects
@@ -24808,7 +24808,7 @@
 			)
 		)
 		(property "Value" "TP fan"
-			(at 8.636 0 0)
+			(at 8.907 -0.499 0)
 			(layer "F.Fab")
 			(uuid "66939a73-4b2f-47c9-b473-948dee2ca964")
 			(effects
@@ -31280,7 +31280,7 @@
 			)
 		)
 		(property "Value" "supply nopop"
-			(at 1.761438 15.3135 0)
+			(at 1.571038 11.0415 90)
 			(unlocked yes)
 			(layer "F.Fab")
 			(uuid "e46b6e15-9716-430d-b064-c043b6a581e4")
@@ -33614,7 +33614,7 @@
 			)
 		)
 		(property "Value" "TS-NTC-103 10k"
-			(at 2.6162 -11.9126 180)
+			(at 1.234 -12.068 180)
 			(layer "F.Fab")
 			(uuid "e646e6c0-b3cf-4c3c-86ed-e6c7826a5762")
 			(effects
@@ -38546,7 +38546,7 @@
 			)
 		)
 		(property "Value" "5A polyfuse"
-			(at 5.6896 -0.5588 0)
+			(at 6.3952 -0.3016 0)
 			(layer "F.Fab")
 			(uuid "3d2a814d-7d8a-4c99-959b-f1990d4d82c3")
 			(effects
@@ -43261,14 +43261,27 @@
 			(justify left bottom)
 		)
 	)
-	(gr_text "FIXME: Power supply barrel connector wrong polarity -> reroute"
-		(at 86.98 129.76 -0)
-		(layer "F.Cu")
-		(uuid "d06dcb3d-61f7-46b5-ab9d-a35c29a9f224")
+	(gr_text "5V/12V Drain\n"
+		(at 183.9 109.025 90)
+		(layer "B.Cu")
+		(uuid "822cfa54-4e7d-4926-a61c-a59f69039109")
 		(effects
 			(font
-				(size 1.5 1.5)
-				(thickness 0.3)
+				(size 1 1)
+				(thickness 0.25)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "12V, 5V, 3V3, GND"
+		(at 126.625 29.55 0)
+		(layer "Cmts.User")
+		(uuid "0768b060-fa5a-44d8-8fb6-510f71d7a46c")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.25)
 				(bold yes)
 			)
 			(justify left bottom)
@@ -43286,6 +43299,32 @@
 			(justify left bottom)
 		)
 	)
+	(gr_text "GND, 3V3, -5V, 5V, GND"
+		(at 184.2 53.2 90)
+		(layer "Cmts.User")
+		(uuid "ac167a33-155f-491c-855c-7a657d21e44e")
+		(effects
+			(font
+				(size 1 1)
+				(thickness 0.25)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
+	(gr_text "FIXME: Power supply barrel connector wrong polarity -> reroute"
+		(at 94.05 133.4 0)
+		(layer "Cmts.User")
+		(uuid "d06dcb3d-61f7-46b5-ab9d-a35c29a9f224")
+		(effects
+			(font
+				(size 1.5 1.5)
+				(thickness 0.3)
+				(bold yes)
+			)
+			(justify left bottom)
+		)
+	)
 	(gr_text "Solder on Top side as well"
 		(at 195.4022 53.1368 0)
 		(layer "Cmts.User")

power-supply-board_v1.0/power-supply-board_v1.0.kicad_prl

@@ -1,82 +0,0 @@
-{
-  "board": {
-    "active_layer": 31,
-    "active_layer_preset": "",
-    "auto_track_width": false,
-    "hidden_netclasses": [],
-    "hidden_nets": [],
-    "high_contrast_mode": 0,
-    "net_color_mode": 1,
-    "opacity": {
-      "images": 0.5,
-      "pads": 1.0,
-      "tracks": 1.0,
-      "vias": 1.0,
-      "zones": 0.4000000059604645
-    },
-    "selection_filter": {
-      "dimensions": false,
-      "footprints": true,
-      "graphics": true,
-      "keepouts": false,
-      "lockedItems": false,
-      "otherItems": false,
-      "pads": false,
-      "text": true,
-      "tracks": true,
-      "vias": false,
-      "zones": false
-    },
-    "visible_items": [
-      0,
-      1,
-      2,
-      3,
-      4,
-      5,
-      8,
-      9,
-      10,
-      11,
-      13,
-      15,
-      16,
-      17,
-      18,
-      19,
-      20,
-      21,
-      22,
-      23,
-      24,
-      25,
-      26,
-      27,
-      28,
-      29,
-      30,
-      32,
-      33,
-      34,
-      35,
-      36,
-      39,
-      40
-    ],
-    "visible_layers": "48352a0_80000001",
-    "zone_display_mode": 0
-  },
-  "git": {
-    "repo_password": "",
-    "repo_type": "",
-    "repo_username": "",
-    "ssh_key": ""
-  },
-  "meta": {
-    "filename": "power-supply-board_v1.0.kicad_prl",
-    "version": 3
-  },
-  "project": {
-    "files": []
-  }
-}

power-supply-board_v1.0/power-supply-board_v1.0.kicad_sch

@@ -4,6 +4,13 @@
 	(generator_version "8.0")
 	(uuid "af4d11a6-73e1-4c39-a25e-5fe7dfa07237")
 	(paper "A3")
+	(title_block
+		(title "power-supply-board")
+		(date "2024-12-20")
+		(rev "V1.0")
+		(comment 2 "Supplies 3V3, 5V -5V, 12V, Filtered 24V")
+		(comment 3 "Supply board for rpi-interface board")
+	)
 	(lib_symbols
 		(symbol "Amplifier_Operational:MCP6002-xP"
 			(pin_names
@@ -14504,7 +14511,7 @@
 		)
 		(uuid "c5813cfa-ba8c-4a80-a9d4-664143707d07")
 	)
-	(text "2 NTC sensors spread in housing"
+	(text "2 NTC sensors spread in housing\ne.g. RPI Cpu and 5V Regulator"
 		(exclude_from_sim no)
 		(at 208.534 59.436 0)
 		(effects
@@ -14675,7 +14682,7 @@
 		)
 		(uuid "f9ba8cda-125a-469c-9294-dbb980b4df9f")
 	)
-	(text "TODO next version:\n  - add LED for each voltage in housing (external using connector)?\n  - FIXME: Verify power supply barrel connector polarity (wrong in V1.0)\n\nFixed since V1.0:\n  - TVS polarity\n  - Fuse, Diode footprint\n  - add GND Testpoint\n  - led gnd via\n  - 5x low power connector\n\n"
+	(text "TODO next version:\n  - add LED for each voltage in housing (external using connector)?\n  - FIXME: Verify power supply barrel connector polarity (wrong in V1.0)\n\nChangelog / Fixed since V1.0:\n  - TVS polarity\n  - Fuse, Diode footprint\n  - add GND Testpoint\n  - led gnd via\n  - 5x low power connector\n\n"
 		(exclude_from_sim no)
 		(at 114.3 34.544 0)
 		(effects

rpi-scripts/examples/read_analog_inputs.py

@@ -0,0 +1,20 @@
+# Include external libraries
+import os
+import sys
+import time
+from mcp3208 import MCP3208
+
+
+# Include custom files
+# Add the parent directory to the module search path
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+from interface_board_libs.adc_mcp3208 import MCP3208
+from interface_board_pins import ADC_CHANNELS
+
+
+adc = MCP3208()
+
+while True:
+        for i in range(8):
+                print('ADC[{}]: {:.2f}'.format(i, adc.read(i)))
+        time.sleep(0.5)

rpi-scripts/examples/read_digital_inputs.py

@@ -0,0 +1,30 @@
+# Add the parent directory to the module search path
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+# Include the common pin assignment (from parent folder)
+from interface_board_pins.py import GPIO_DIGITAL_INPUTS # map of which GPIO pins are associated with which input terminal (1-8)
+
+import RPi.GPIO as GPIO
+
+
+
+# Initialize GPIO
+GPIO.setmode(GPIO.BCM)
+for pin in DIGITAL_INPUTS.values():
+    GPIO.setup(pin, GPIO.IN)
+
+
+
+# Repeatedly read GPIOs
+print("Reading digital inputs:")
+try:
+    while True:
+        for label, pin in GPIO_DIGITAL_INPUTS.items():
+            state = GPIO.input(pin)
+            print(f"Input {label} (GPIO {pin}): {'HIGH' if state else 'LOW'}")
+        print("-" * 40)
+
+except KeyboardInterrupt:
+    print("Exiting...")
+
+finally:
+    GPIO.cleanup()

rpi-scripts/examples/write_digital_outputs_shift_reg.py

@@ -0,0 +1,66 @@
+# Include external libraries
+import os
+import sys
+from time import sleep
+
+# Add the parent directory to the module search path
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+# Include custom files
+from interface_board_libs.shift_register import ShiftRegister # custom shift register class
+from interface_board_pins import ( # pin / channel assignment
+    GPIO_SHIFT_REG_DATA,
+    GPIO_SHIFT_REG_LATCH,
+    GPIO_SHIFT_REG_CLOCK,
+    SHIFT_REG_CHANNEL_BUZZER,
+    SHIFT_REG_CHANNEL_RELAY1,
+    SHIFT_REG_CHANNEL_RELAY2,
+)
+
+
+# Initialize the shift register
+sr = ShiftRegister(GPIO_SHIFT_REG_DATA, GPIO_SHIFT_REG_LATCH, GPIO_SHIFT_REG_CLOCK)
+
+try:
+    print("Writing to shift register...")
+
+    # repeatedly write to shift register
+    while True:
+        # # Cycle through all combinations of pin states (write entire byte)
+        # print("Writing all byte values (0-255)...")
+        # for value in range(256):
+        #     sr.write_byte(value)  # Write the current value
+        #     print(f"Output: {bin(value)}")  # Print binary representation
+        #     sleep(0.05)  # Delay between each byte
+
+        # Turn each pin on and off one by one
+        print("\nToggling each pin one by one...")
+        # channels 0-4 are connected to terminal only
+        for pin in range(4): # 0-4 are connected to terminal only
+            print(f"Setting pin {pin} HIGH.")
+            sr.set_pin(pin, True)  # Set the pin HIGH
+            sleep(0.5)
+            print(f"Setting pin {pin} LOW.")
+            sr.set_pin(pin, False)  # Set the pin LOW
+            sleep(0.5)
+
+        # channels 5-7 are connected to terminal AND buzzer/relays
+        print("Activating buzzer...")
+        sr.set_pin(SHIFT_REG_CHANNEL_BUZZER, True)  # Turn buzzer ON
+        sleep(0.5)
+        sr.set_pin(SHIFT_REG_CHANNEL_BUZZER, False)  # Turn buzzer OFF
+
+        print("Toggling Relay 1...")
+        sr.toggle_pin(SHIFT_REG_CHANNEL_RELAY1)
+        sleep(0.5)
+        sr.toggle_pin(SHIFT_REG_CHANNEL_RELAY1)
+
+        print("Activating Relay 2...")
+        sr.set_pin(SHIFT_REG_CHANNEL_RELAY2, True)  # Turn relay ON
+        sleep(0.5)
+        sr.set_pin(SHIFT_REG_CHANNEL_RELAY2, False)  # Turn relay OFF
+
+finally:
+    sr.clear()  # Clear the shift register
+    print("Shift register cleared.")
+    GPIO.cleanup()  # Clean up GPIO settings

rpi-scripts/interface_board_libs/shift_register.py

@@ -0,0 +1,49 @@
+import RPi.GPIO as GPIO
+from time import sleep
+
+
+class ShiftRegister:
+    def __init__(self, data_pin, latch_pin, clock_pin):
+        self.data_pin = data_pin
+        self.latch_pin = latch_pin
+        self.clock_pin = clock_pin
+        self.current_byte = 0  # Tracks the current state of the shift register
+
+        GPIO.setmode(GPIO.BCM)
+        GPIO.setup(self.data_pin, GPIO.OUT)
+        GPIO.setup(self.latch_pin, GPIO.OUT)
+        GPIO.setup(self.clock_pin, GPIO.OUT)
+
+    def write_byte(self, byte):
+        """Writes an 8-bit value to the shift register."""
+        GPIO.output(self.latch_pin, 0)
+        for i in range(8):
+            GPIO.output(self.clock_pin, 0)
+            GPIO.output(self.data_pin, (byte >> (7 - i)) & 1)  # MSB first
+            GPIO.output(self.clock_pin, 1)
+        GPIO.output(self.latch_pin, 1)
+        self.current_byte = byte  # Update the internal state
+
+    def clear(self):
+        """Clears the shift register (sets all outputs to 0)."""
+        self.write_byte(0)
+
+    def set_pin(self, pin, state):
+        """
+        Sets an individual pin to HIGH (1) or LOW (0).
+        Pins are numbered 0-7, with 0 being the MSB.
+        """
+        if not 0 <= pin <= 7:
+            raise ValueError("Pin must be in range 0-7.")
+        if state:
+            self.current_byte |= (1 << (7 - pin))  # Set the bit to 1
+        else:
+            self.current_byte &= ~(1 << (7 - pin))  # Set the bit to 0
+        self.write_byte(self.current_byte)
+
+    def toggle_pin(self, pin):
+        """Toggles the state of an individual pin."""
+        if not 0 <= pin <= 7:
+            raise ValueError("Pin must be in range 0-7.")
+        self.current_byte ^= (1 << (7 - pin))  # Flip the bit
+        self.write_byte(self.current_byte)

rpi-scripts/interface_board_pins.py

@@ -0,0 +1,85 @@
+# Pin mappings for GPIOs and other components specifically for the pi-interface-board_v1.0
+
+
+
+# === Digital Inputs ===
+# Pin mappings for digital inputs (labeled on housing as 1-8)
+GPIO_DIGITAL_INPUTS = {
+    1: 25,  # Dig-IN_1 is connected to GPIO_25
+    2: 16,  # Dig-IN_2 is connected to GPIO_16
+    3: 26,  # Dig-IN_3 is connected to GPIO_26
+    4: 13,  # Dig-IN_4 is connected to GPIO_13
+    5: 6,   # Dig-IN_5 is connected to GPIO_6
+    6: 5,   # Dig-IN_6 is connected to GPIO_5
+    7: 22,  # Dig-IN_7 is connected to GPIO_22
+    8: 24,  # Dig-IN_8 is connected to GPIO_24
+}
+
+
+
+
+# === Shift Register ===
+GPIO_SHIFT_REG_DATA = 27
+GPIO_SHIFT_REG_LATCH = 17
+GPIO_SHIFT_REG_CLOCK = 4
+
+# Shift Register Channel Assignments
+SHIFT_REG_CHANNEL_BUZZER = 7  # Buzzer connected to shift register channel 7
+SHIFT_REG_CHANNEL_RELAY1 = 6  # Relay 1 connected to shift register channel 6
+SHIFT_REG_CHANNEL_RELAY2 = 5  # Relay 2 connected to shift register channel 5
+
+
+
+
+# === ADC ===
+# ADC IC is connected to RPI SPI interface 0 (pins below)
+ADC_SPI_BUS_NUM = 0  
+ADC_SPI_DEVICE_NUM = 0
+ADC_SPI_CS_PIN = 8  # SPI Chip Select for MCP3208
+# MISO_0: GPIO_9
+# MOSI_0: GPIO_10
+# SCLK_0: GPIO_11
+# CE_0:   GPIO# MCP3208 (ADC)
+
+ADC_CHANNELS = {
+    1: 0,  # Channel 1 = ADC channel 0
+    2: 1,  # Channel 2 = ADC channel 1
+    3: 2,  # ...
+    4: 3,
+    5: 4,
+    6: 5,
+    7: 6,
+    8: 7
+}
+
+
+
+
+# === SPI Terminal ===
+SPI_BUS_NUM = 1
+# MISO_1: GPIO_19
+# MOSI_1: GPIO_20
+# SCLK_1: GPIO_21
+# CE_1:   GPIO_7
+
+
+
+
+# === I2C Terminal ===
+GPIO_I2C_SDA = 2
+GPIO_I2C_SCL = 3
+
+
+
+
+# === PWM outputs ===
+GPIO_PWM1 = 12  # RPI_PWM0
+GPIO_PWM2 = 18  # RPI_PWM0 too
+
+
+
+
+# === UART / RS485 ===
+GPIO_UART_TX = 14 # RPI TXD
+GPIO_UART_RX = 15 # RPI RXD
+GPIO_UART_DIR = 23