#!/usr/bin/env python
# -*- coding: utf-8 -*-
import serial
from time import sleep
port = '/dev/ttyAMA0'
baud = 9600
serial_connection = serial.Serial(port=port, baudrate=baud)
sleep(0.2)
serial_connection.write('a--D11HIGH--')
sleep(3)
serial_connection.write('a--D11LOW--')
serial_connection.close