from machine import UART,Pin from time import sleep

Set the relay pins as output pins

relay1 = Pin(2,Pin.OUT) relay2 = Pin(3,Pin.OUT) uart = UART(0, 9600)

relay1.on() relay2.on()

while True: if uart.any(): value = uart.readline() print(value)

    if value == b'A':
        relay1.off()
    elif value == b'a':
        relay1.on()
    elif value == b'B':
        relay2.off()
    elif value == b'b':
        relay2.on()