readSerial.py

# Receives a string from Arduino using readline()
# Requires PySerial

# (c) www.xanthium.in 2021
# Rahul.S

import serial
import time

SerialObj = serial.Serial('/dev/ttyACM0',9600) # COMxx   format on Windows
                                        # /dev/ttyUSBx format on Linux
                                        #
                                        # Eg /dev/ttyUSB0
                                        # SerialObj = serial.Serial('/dev/ttyUSB0')

time.sleep(3)   # Only needed for Arduino,For AVR/PIC/MSP430 & other Micros not needed
                # opening the serial port from Python will reset the Arduino.
                # Both Arduino and Python code are sharing Com11 here.
                # 3 second delay allows the Arduino to settle down.


while True:
  SerialObj.timeout = 3 # set the Read Timeout
  ReceivedString = SerialObj.readline() #readline reads a string terminated by \n

  print(ReceivedString)
  with open('readme.txt', 'a') as f:
    f.writelines(ReceivedString)


SerialObj.close()          # Close the port