from serial import Serial
    serial_port = Serial(port='/dev/ttyACM0', baudrate=9600) # ou serial_port = Serial("/dev/ttyAMA0", baudrate=9600, timeout=0.5)
    lu = serial_port.write("la donnee est bonne")
    lu = serial_port.readline()
    lu # renvoie 'chaine recue et renvoyee:la donnee est bonne\r\n'
    Serial.close(serial_port)