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Add photos, exports; Finalize kicad projects + housing; Rework README

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.gitignore vendored
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#temporary
datasheets/
pi-interface-board_v1.0/export/
export/
pcb2gcode/
cad/import
@ -10,10 +9,12 @@ cad/import
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*.lck
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fp-info-cache
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*.bak
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*.kicad_prl
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README.md
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# 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.
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.
@ -19,7 +19,7 @@ The project is intended for versatile use in prototyping and project development
# Repository Content
- **KiCad Projects**: 3 KiCad projects with schematics and PCB layouts for the custom pcbs created.
- **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).
@ -30,8 +30,8 @@ The project is intended for versatile use in prototyping and project development
# 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)
- 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.
@ -46,24 +46,24 @@ Detailed features of each PCB are described in the respective sections below.
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="60%"/>
<img src="doc/photos/rpi-interface-board.jpg" alt="Raspberry Pi Interface Board" width="80%"/>
### Features
**Inputs**:
- **8x Digital Inputs**:
- Wide continous voltage range (-1.7V to 120V), idea: compatible with 3V and 24V devices.
- 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
- Reverse polarity protection.
- Isolated with optocouplers.
- Optional low-pass filters (toggle via DIP switches).
- **8x Analog Inputs
- **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
- 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).
@ -78,14 +78,14 @@ This board connects to the Raspberry Pi via a 40-pin ribbon cable and provides p
**General**:
- WAGO spring-loaded terminals for easy wiring.
- JST connectors for external LEDs for all inputs and outputs indicate the current pin state.
- JST connectors for external LEDs for all inputs and outputs to indicate the current pin state.
**Bus Communication**:
- RS485 (TVS protection, idle pullup/pulldown, 120Ω terminator).
- RS485 (TVS protection, idle pull-up/pull-down, 120 Ω terminator).
- UART (unprotected).
- I2C (TVS diodes, 2.2k pullups).
- 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)
Note: Either RS485 or UART can be used at the same time (select with jumpers).
### Schematic and Layout
<p align="center">
@ -100,10 +100,10 @@ Note: Either RS485 or UART can be used at the same time (select with jumpers)
## 2. **Power Supply Board**
Creates different voltages from supplied 24V. Supply for the rpi interface board as well as several terminals for variable use (connect sensors, devices etc to the housing)
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="50%"/>
<img src="doc/photos/power-supply-board.jpg" alt="Power Supply Board" width="60%"/>
### Features
**Input**:
@ -118,11 +118,11 @@ Creates different voltages from supplied 24V. Supply for the rpi interface board
- 12 V, 3 A (buck converter).
- 24 V (supply voltage filtered).
**Fan Control:**
- 2x connector for 10k NTC.
- Threshold adjustable (trim poti).
- Hysteresis adjustable (trim poti).
- select between 5V or 12V Fan.
**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.
@ -178,7 +178,7 @@ Custom-designed enclosure includes:
- Openings for buttons and LEDs.
- Mounts for all PCBs and wiring.
<img src="doc/images/3d-model_housing.png" width="51%" alt="3d-model"/>
<img src="doc/graphics/3d-model_housing.png" width="80%" alt="3D Model"/>
---
@ -191,5 +191,7 @@ The following ideas were considered but not implemented:
- 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

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