Last Updated or created 2026-07-20

Test for UART serial communication for my whack-a-mole game

CODE for Client

import board
import busio
import time

uart = busio.UART(
    tx=board.GP16,
    rx=board.GP17,
    baudrate=115200,
    timeout=1,
)

time.sleep(2)

commands = ["PING", "HELLO", "TEST"]
while True:
    for cmd in commands:
        print("Sending:", cmd)
        uart.write((cmd + "\n").encode())

        response = uart.readline()

        if response:
            print("Response:", response.decode().strip())
        else:
            print("No response")

        time.sleep(1)

CODE for server

import board
import busio
import digitalio
import time

# UART pins
uart = busio.UART(
    tx=board.GP0,
    rx=board.GP1,
    baudrate=115200,
    timeout=0.1
)

# Onboard LED
led = digitalio.DigitalInOut(board.LED)
led.direction = digitalio.Direction.OUTPUT

print("UART LED server ready")

while True:
    data = uart.readline()

    if data:
        command = data.decode("utf-8").strip()
        print("Received:", command)

        if command == "PING":
            # Blink LED
            led.value = True
            time.sleep(0.2)
            led.value = False

            # Reply
            uart.write(b"PONG\n")

        else:
            uart.write(b"UNKNOWN\n")

    time.sleep(0.01)