#----------------------------------------
#         arduino_servo.py
# Reads a file: 'data.txt' that is writable from 
# '0n.php' or 'off.php' scripts in /var/www/html/piWeb
# called from webpage /var/www/html/index.html
#
# gpio LED setup: Using GPIO block pin 11 -which is 
# called GPIO 17: an LED is wired through a 330 ohm 
# resistor to Gnd pin.
#
#  An example of send serial data to the USB port
#  (the attached Arduino)
#----------------------------------------

import serial
import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.OUT)

ser = serial.Serial('/dev/ttyACM0', 9600, timeout=1)
ser.reset_input_buffer()

while True:
    read_data = open('/var/www/html/piWeb/data.txt', 'r')
    str = read_data.read()
    rtest = str[7:10]
    print(rtest)
    if rtest == 'on.':
        print("It's true!") 
        GPIO.output(11, True)    #--- LED on
        ser.write(b'0')          #-- send one byte
    else:
        print("Stopped -False-")
        GPIO.output(11, False)   #-- LED off
        ser.write(b'1')          # send different byte
    read_data.close()
    time.sleep(1)