Communication between arduino and python with pyserial

 Arduino Code:

int led = 8;

void setup() {

  // put your setup code here, to run once:

  pinMode(led, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  // put your main code here, to run repeatedly:

   while (Serial.available() == 0) {}

    String teststr = Serial.readString();

    teststr.trim();

 

    if (teststr == "on") {

      digitalWrite(led, HIGH);

      Serial.print(teststr);

    } else if (teststr == "off") {

      digitalWrite(led, LOW);

      Serial.print(teststr);

    }

 

}

Python Code:

import serial

import time

ser = serial.Serial(port='COM3', baudrate=9600, bytesize=serial.EIGHTBITS)

while True:

    inputVal = input("Enter on or off :")

    ser.write(bytes(inputVal, 'utf-8'))

    time.sleep(0.05)

Circuit: