Cls-3900 Car Uart May 2026

void loop() if (Serial.available()) char c = Serial.read(); // process data

CLS-3900 TX → RPi RX (GPIO 15) CLS-3900 RX → RPi TX (GPIO 14) GND → GND VCC → 3.3V (if supported) Python on Raspberry Pi: cls-3900 car uart

void setup() Serial.begin(9600);