Stalker Radar MPH from serial port to Macbook M2

serialread.py

import time
import serial
import logging
from datetime import datetime

def hex_to_speed(hex_str):
    """Convert hex string to speed value"""
    try:
        # Convert from hex to decimal and add 4
        # (hex 47 = decimal 71 -> 47 mph)
        decimal = int(hex_str, 16)
        return decimal
    except:
        return None

def km_to_mph(km_speed):
    """Convert kilometers per hour to miles per hour"""
    return round(km_speed * 0.621371)

def main():
    port_name = '/dev/tty.PL2303G-USBtoUART10'
    baud_rate = 9600
    
    print("Starting Stalker Pro II radar gun data logger...")
    
    try:
        ser = serial.Serial(
            port=port_name,
            baudrate=baud_rate,
            bytesize=serial.EIGHTBITS,
            parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE,
            timeout=1
        )

        print(f"Connected to {port_name}")
        print("Waiting for speed readings... Press Ctrl+C to stop")
        
        buffer = []
        last_pattern = None
        last_speed_time = None
        
        while True:
            if ser.in_waiting > 0:
                data = ser.read()
                hex_value = data.hex().upper()
                buffer.append(hex_value)
                
                # Look for the start sequence (0D 88 42 44)
                if len(buffer) >= 4 and buffer[-4:] == ['0D', '88', '42', '44']:
                    if len(buffer) > 4:
                        pattern = ' '.join(buffer[:-4])
                        
                        # Only process if pattern is different
                        if pattern != last_pattern:
                            parts = pattern.split()
                            current_time = time.time()
                            
                            # Look for sequence "35 41"
                            if '35' in parts and '41' in parts:
                                idx = parts.index('41')
                                if idx + 3 < len(parts):
                                    hex_speed1 = parts[idx + 2]
                                    hex_speed2 = parts[idx + 3]
                                    if hex_speed1 != '20' and hex_speed2 != '20':
                                        if last_speed_time is None or (current_time - last_speed_time) > 2.0:
                                            # Convert hex to ASCII characters
                                            char1 = chr(int(hex_speed1, 16))
                                            char2 = chr(int(hex_speed2, 16))
                                            # Join the characters and convert to integer
                                            speed = int(char1 + char2)
                                            timestamp = datetime.now().strftime('%H:%M:%S')
                                            print(f"\n🎯 {timestamp} - Pitch detected: {speed} mph")
                                            last_speed_time = current_time
                            
                            last_pattern = pattern
                    
                    buffer = buffer[-4:]

            time.sleep(0.001)

    except KeyboardInterrupt:
        print("\nStopped by user")
    finally:
        if 'ser' in locals():
            ser.close()

if __name__ == "__main__":
    main()