Python Serial Monitor

Here’s a simple and clean Python serial monitor (CLI version) using pyserial. It works across Windows, macOS, and Linux, and reads/writes to your Arduino or other microcontroller just like the Arduino IDE Serial Monitor.

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🔧 Step 1: Install pyserial

bashCopyEditpip install pyserial

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🐍 Step 2: Basic Serial Monitor Script

pythonCopyEditimport serial
import threading

# === CONFIGURATION ===
PORT = '/dev/ttyUSB0'   # Change to your actual port, e.g. COM3 on Windows
BAUDRATE = 9600

def read_from_port(ser):
    while True:
        try:
            if ser.in_waiting:
                line = ser.readline().decode('utf-8', errors='ignore').strip()
                print(f"[RX] {line}")
        except Exception as e:
            print(f"[Error] {e}")
            break

def main():
    try:
        ser = serial.Serial(PORT, BAUDRATE, timeout=1)
        print(f"[Connected] Listening on {PORT} at {BAUDRATE} baud")

        thread = threading.Thread(target=read_from_port, args=(ser,), daemon=True)
        thread.start()

        while True:
            cmd = input("> ")
            if cmd.lower() in ['exit', 'quit']:
                break
            ser.write((cmd + "\n").encode('utf-8'))

    except serial.SerialException as e:
        print(f"[Failed to connect] {e}")
    except KeyboardInterrupt:
        print("\n[Stopped by user]")

if __name__ == "__main__":
    main()

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🧪 Example Output

bashCopyEdit[Connected] Listening on /dev/ttyUSB0 at 9600 baud
> LED ON
[RX] LED is now ON
> LED OFF
[RX] LED is now OFF
> quit

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✅ Features

• Real-time read from serial port
• Can send commands by typing
• Works on any serial device (Arduino, ESP32, etc.)
• Graceful exit with quit or Ctrl+C