A Raspberry Pi Pico is connected to a Raspberry Pi SBC (single board computer). A button and LED are present at both ends. Pressing the button on one device lights up the LED on the other device by exchanging signal strings by using the serial interfaces at each end via USB.

I initially developed this for my other project at raspberrypi-wigglegram-camera, but it wasn’t included in the final design.

Software Used

• Raspberry Pi 4
  • Ubuntu Server 24.10 (64 bit)
  • python3-gpiozero
    • *May not need to install manually if using Raspberry Pi OS
• Raspberry Pi Pico
  • Circuit Python (no external libraries used)

Build

Parts List	Wiring Diagram
Raspberry Pi SBC (I developed it on a Raspberry Pi 4) Raspberry Pi Pico (rp2040 micro controller) 2x LEDs 2x Push Buttons 2x 330ohm resistors 2x Breadboards Breadboard wires Micro USB Data cable Power source for the SBC

Useful Commands

Desc	Command
Mount the pico to the raspberry pi sbc to modify pico code directly	sudo mkdir -p /mnt/pico; sudo mount /dev/sda1 /mnt/pico
I had to run as root to access the GPIO pin	sudo python3 sbc/code.py