import serial
from time import sleep
import sys

# Settings
COM_PORT = '/dev/tty.usbmodem14101'
BAUD_RATES = 9600
ser = serial.Serial(COM_PORT, BAUD_RATES)

# 傳值給 Arduino
def serial_write(text):
    s_to_byte_text = bytes(text + '\n', encoding = "utf8")
    ser.write(s_to_byte_text)

# LED example
def led(ser, choice):
    if choice == '1':
        print('傳送開燈指令')
        serial_write('LED_ON')
        sleep(0.5)
    elif choice == '2':
        print('傳送關燈指令')
        serial_write('LED_OFF')
        sleep(0.5)
    elif choice == 'e':
        ser.close()
        print('再見！')
        sys.exit()
    else:
        print('指令錯誤…')

    while ser.in_waiting:
        mcu_feedback = ser.readline().decode()
        print('控制板回應：', mcu_feedback)

try:
    while True:
        choice = input('按1開燈、按2關燈、按e關閉程式  ').lower()
        led(ser, choice);

except KeyboardInterrupt:
    ser.close()
    print('再見！')