USB serial communication arduino nano and jetson nano

Question

I want to communicate between Jetson nano and arduino nano through serial.

I wrote a simple script to test functionality but I receive strange data

here is the arduino code

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  Serial.println("work fine");
  delay(10000);
}

and this is the python code run on jetson nano

import serial
import time

arduino = serial.Serial('/dev/ttyUSB0', 9600, timeout=1)

while True:
  try:
     data = arduino.readline()
     if data:
        print(data)
        print('Hi Arduino')
  except:
     arduino.close

the output is

b'\x17\x0f\t\x0b\x01\x06\t\x0e\x15\r\n'
Hi Arduino

if tried different baud rates but nothing change.

when is use serial monitor on windows it works fine.

Answer 1

I also belive its to do with the following line,

 data = arduino.readline()

Try the following,

while True:


try:
     arduino.flushInput() // Clear buffer

     data = arduino.readline()

     // decode the bytes into str format, 'utf-8' arg should work
     data.decode('utf-8')

     // strip the \r\t in the str output
     data.strip()
     if data:
        print(data)
        print('Hi Arduino')
  except:
     arduino.close

See if this resolves your problem.

Note: I used an ESP32 and python script with the above-mentioned changes and it worked for me.

Also, as mentioned in the comment section some of the information might be missing in the output 'b'\x17\x0f\t\x0b\x01\x06\t\x0e\x15\r\n' this is not something reproducible for me. Just for reference my byte string output without the modifications was b'work fine\r\n' not 'b'\x17\x0f\t\x0b\x01\x06\t\x0e\x15\r\n'

• double-check Arduino write speed,
• double-check python serial connection baud rate,
• include the py script correction

see if this helps resolve your problem.

Answer 2

This stackoverflow question/answer implies that .readline() needs to be converted to a string.

import serial
ser = serial.Serial("COM11", 9600)
while True:
     cc=str(ser.readline())
     print(cc[2:][:-5])

I agree w/one of the comments to that answer that it might be better written as:

import serial
ser = serial.Serial("COM11", 9600)
while True:
     cc=str(ser.readline())
     cc=cc.decode("utf-8")
     print(cc)