Komunikacja Arduino z aplikacją python

pip install pyserial

// Arduino
const int ledPin = 13;
char inData;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  if (Serial.available() > 0) {
    inData = Serial.read();
    if (inData == 'H') {
      digitalWrite(ledPin, HIGH);
    }
    if (inData == 'L') {
      digitalWrite(ledPin, LOW);
    }
  }
}

#Python
import serial
import time
ser = serial.Serial('com5', 9600) #podaj odpowiedni com
time.sleep(3)

def sendCommand(c):    
  ser.write(c.encode())

while(True):
  my_command = input("0-off, 1-on: ")
  # my_command = input("L-off, H-on: ")
  sendCommand(my_command)

#python tkinter
import serial
import time
import tkinter

def set_button1_state():
        btn_state_label['text'] = "LED ON"
        ser.write(bytes('H', 'UTF-8'))

def set_button2_state():
        btn_state_label['text'] = "LED OFF"
        ser.write(bytes('L', 'UTF-8'))

ser = serial.Serial('com3', 9600)
time.sleep(3)
root = tkinter.Tk()
root.geometry('300x300')
root.title("Python with Arduino")
label3 = tkinter.Label(text = 'LED Controll',font=("Courier", 12,'bold')).pack()
btn_state_label = tkinter.Label(text = "___")
btn_state_label.pack()

button1state = tkinter.Button(root,
    text="ON",
    command=set_button1_state,
    height = 4,
    fg = "black",
    width = 8,
    bd = 5,
    background = "green"
)
button1state.pack(side='top', ipadx=10, padx=10, pady=15)

button2state = tkinter.Button(root,
    text="OFF",
    command=set_button2_state,
    height = 4,
    fg = "black",
    width = 8,
    bd = 5,
    background='red'
)
button2state.pack(side='top', ipadx=10, padx=10, pady=15)

tkinter.mainloop()

//Arduino
const int countDelay = 1000;
unsigned long previousMillis = 0;
int counter = 0;
void setup() {
  Serial.begin(9600);
}

void countWithDelay() {
  if (millis() - previousMillis >= countDelay) {
    previousMillis = millis();
    Serial.println(counter);
    counter++;
  }
}

void loop() {
  countWithDelay();
}

#Python
import serial
import time
port = 'COM5'
baud_rate = 9600

try:
    ser = serial.Serial(port, baud_rate, timeout=1)
    time.sleep(2) 
    print("Connected to:", port)
    while True:
        if ser.in_waiting > 0:
            line = ser.readline().decode('utf-8', errors='ignore').rstrip()
            print("Received:", line)
except serial.SerialException as e:
    print("Error:", e)
finally:
    ser.close()
    print("Serial connection closed")