pySerialを使った顕微鏡用多波長LED光源の高速波長切り替えについて

import datetime
import serial.tools.list_ports
import time

# COMポートに接続されている機器の情報を取得
coms = serial.tools.list_ports.comports()

# シグナルコンバーターの名前を設定
signal_converter_name = 'Numato Lab 2 Channel USB Powered Relay Module'

# シグナルコンバーターの名前を検索
print('[{}] searching the COM list...'.format(datetime.datetime.now()))

for com in coms:
    flag = signal_converter_name in com.description

    # 該当の名前が見つかったらCOMポートの番号を格納
    if flag is True:
        COM_PORT = com.device
        print('[', datetime.datetime.now(), ']', 'connected COM ports is: ', com.description)
    else:
        pass


def led_on(gpio_number=0):
    """
    LED ON function.
    Serial command to TTL signal conversion. TTL ON.

    Parameters
    ----------
    gpio_number : GPIO port number. Default is 0.

    Returns
    -------
    HIGH(5V) signal output from GPIO pin.

    """
    # シグナルコンバーターからTTL信号を出力するピン番号の設定
    gpio_port = str(gpio_number).encode()

    # ONに設定
    gpio_command = b'set'  # 'set' means HIGH(5V)

    # Open port for communication
    serPort = serial.Serial(COM_PORT, 19200, timeout=1)

    # Send the serial command
    serPort.write(b'gpio' + b' ' + gpio_command + b' ' + gpio_port + b'\n\r')
    print('[', datetime.datetime.now(), ']', 'LED_on')

    # Close the port
    serPort.close()


def led_off(gpio_number=0):
    """
    LED OFF function.
    Serial command to TTL signal conversion. TTL OFF.

    Parameters
    ----------
    gpio_number : GPIO port number. Default is 0.

    Returns
    -------
    LOW(0V) signal output from GPIO pin.

    """
    # シグナルコンバーターからTTL信号を出力するピン番号の設定
    gpio_port = str(gpio_number).encode()

    # OFFに設定
    gpio_command = b'clear'  # 'clear' means LOW(0V)

    # Open port for communication
    serPort = serial.Serial(COM_PORT, 19200, timeout=1)

    # Send the serial command
    serPort.write(b'gpio' + b' ' + gpio_command + b' ' + gpio_port + b'\n\r')
    print('[', datetime.datetime.now(), ']', 'LED_off')

    # Close the port
    serPort.close()


if __name__ == '__main__':

    for i in range(20):
        # LED ON
        led_on(0)

        # wait 1sec
        time.sleep(1)

        # LED OFF
        led_off(0)

        # wait 1sec
        time.sleep(1)

        # LED ON
        led_on(1)

        # wait 1sec
        time.sleep(1)

        # LED OFF
        led_off(1)

        # wait 1sec
        time.sleep(1)