如何使用python从树莓派向arduino发送字符串

Question

I have an Arduino microcontroller (Adafruit feather M0), and if I have it plugged into my windows PC and open the serial monitor, I can type P 0 2 1 0 and then enter , the Arduino interprets this command and works as expected. Now I want to plug in the same device into my raspberry pi, and have python do this instead. I have done this in the past on a different microcontroller (sparkfun pro micro) and it worked great. I can't seem to get it to work and am not sure what I am missing.

python code:

import serial
import time

ser = serial.Serial('/dev/ttyACM0', 115200, timeout = None)
time.sleep(2)

returnKey = "\r\n"
ser.write(str.encode("P 2 1 0"))
ser.write(str.encode(returnKey)

The code finishes, but the Arduino simply does nothing, as if it discarded the command or didn't get it at all. The serial speed is matching on the Arduino too (115200).

I also tried:

ser.write(b'P 2 1 0')
ser.write(returnKey.encode())

Any ideas what I am missing here?

Answer 1

Solved it. Ended up using

import serial
import time

ser = serial.Serial('/dev/ttyACM0', 115200, timeout = None)
time.sleep(2)

ser.write(b'P 2 1 0 \r\n')