Fix systemd service starting too early

README.md

@@ -14,8 +14,8 @@ The project is intended for versatile use in prototyping and project development
 - [Features Overview](#features-overview)
 - [Designed PCBs](#designed-pcbs)
   * [1. Raspberry Pi Interface Board](#1-raspberry-pi-interface-board)
-  * [2. **Power Supply Board**](#2---power-supply-board--)
-  * [3. **LED Boards**](#3---led-boards--)
+  * [2. Power Supply Board](#2---power-supply-board--)
+  * [3. LED Boards](#3---led-boards--)
 - [Raspberry Pi Usage](#raspberry-pi-usage)
   * [Connectivity](#connectivity)
     + [LAN Connection (Ethernet)](#lan-connection--ethernet-)
@@ -33,10 +33,21 @@ The project is intended for versatile use in prototyping and project development
 
 
 # Photos
-### Photo of all Hardware Components
-<p align="center">
-  <img src="doc/photos/all-components.jpg" alt="All Components (Disassembled)" width="75%"/>
-</p>
+#### Photo of all Hardware Components
+### All components:
+  <img src="doc/photos/all-components.jpg" alt="All Components (Disassembled)" width="65%"/>
+
+### Assembly:
+  <img src="doc\photos\all-connected.jpg" alt="" width="65%"/>
+
+### Finished Project:
+  <img src="doc\photos\final_diagonal-view.jpg" alt="" width="65%"/>
+  <img src="doc\photos\final_back-view.jpg" alt="" width="65%"/>
+  <img src="doc\photos\final_right-view.jpg" alt="" width="55%"/>
+
+### Detail views with annotations:
+  <img src="doc\photos\interface-board_top_annotated.jpg" alt="" width="65%"/>
+  <img src="doc\photos\supply-raspberry_annotated.jpg" alt="" width="65%"/>
 
 
 ---
@@ -123,7 +134,7 @@ This board connects to the Raspberry Pi via a 40-pin ribbon cable and provides p
 ---
 
 
-## 2. **Power Supply Board**
+## 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
@@ -162,7 +173,7 @@ Creates different voltages from supplied 24 V. Supply for the Raspberry Pi inter
 
 ---
 
-## 3. **LED Boards**
+## 3. LED Boards
 Small PCBs with LEDs, resistors, and mounting holes for housing indicators.
 
 ### Photo

pi-interface-board_v1.0/pi-interface-board_v1.0.kicad_sch

@@ -20682,8 +20682,8 @@
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-	(text "\n- Digital inputs: Isolate GND (separate GND terminal for opamp diodes) \n- Fixed voltage digital inputs (24V) with voltage divider + protection diode,\n     since some 24V sensors might consider 5V as low\n- Pulldown R analog input (currently leds randomly on when input unused)\n- UART: Add RX TX leds\n- Add diode to prevent backfeeding when USB supply connected too\n- Pin Assignment: Swap PWM1 with DIG-IN_4  so pwm outputs are on \n  different RPI pwm-channels if thats an issue"
+	(text "\n- Digital inputs: Isolate GND (separate GND terminal for opamp diodes) \n- Fixed voltage digital inputs (24V) with voltage divider + protection diode,\n     since some 24V sensors might consider 5V as low\n- Pulldown R analog input (currently leds randomly on when input unused)\n- UART: Add RX TX leds\n- Add diode to prevent backfeeding when USB supply connected too\n- Pin Assignment: Swap PWM1 with DIG-IN_4  so pwm outputs are on \n  different RPI pwm-channels if thats an issue\n- Re-evaluate LED board open drain outputs (8x DO, 2x PWM): \n  When connecting large voltage e.g. 48V motor \n  the led reverse voltage might be too high in off state? \n  -> Add additional normal diode in series + use 5V?"
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-	(text "- Footprint: Digital-in TVS diodes too large -> rotated footprint, increased drill dia\n- Footprint: Increased Pitch Buzzer\n- Footptint: Diodes PWM increased drill dia"
+	(text "- Footprint: Digital-in TVS diodes too large -> rotated footprint, increased drill dia\n- Footprint: Increased Pitch Buzzer\n- Footptint: Diodes PWM increased drill dia\n- Swap Labels for PWM1 <-> PWM2   and Relay1 <-> Relay2  \n   so order is from left to right in housing"
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@@ -21637,7 +21637,7 @@
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@@ -21780,7 +21780,7 @@
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+	(label "LED_relay-2"
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@@ -21824,7 +21824,7 @@
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+	(label "LED_relay-2"
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@@ -28773,7 +28773,7 @@
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+		(property "Value" "Relay2"
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@@ -36917,7 +36917,7 @@
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@@ -37123,7 +37123,7 @@
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power-supply-board_v1.0/power-supply-board_v1.0.kicad_pcb

@@ -43313,7 +43313,7 @@
 		)
 	)
 	(gr_text "FIXME: Power supply barrel connector wrong polarity -> reroute"
-		(at 94.05 133.4 0)
+		(at 94.91 137.52 0)
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rpi-scripts/gui/gui-start.service

@@ -9,16 +9,19 @@
 
 [Unit]
 Description=Start Python GUI for IO-control and monitoring after startup
+# note: when using After=graphical.target: it only starts after successful network connection...
 After=display-manager.service
 Wants=display-manager.service
 
 [Service]
 Environment=DISPLAY=:0
-ExecStart=/usr/bin/python3 /home/pi/git/rpi-interface-board/rpi-scripts/gui/main.py
+
+# note: some delay is needed for DISPLAY :0 to be available
+ExecStart=/bin/bash -c "/bin/sleep 6 && /usr/bin/python3 /home/pi/git/rpi-interface-board/rpi-scripts/gui/main.py"
 WorkingDirectory=/home/pi/git/rpi-interface-board/rpi-scripts/gui
 User=pi
 Group=pi
-Restart=always
+Restart=no
 
 [Install]
 WantedBy=default.target