#---------------------------------------
#      GPIO_serial_servo.py
#
# Reads a file 'data.txt' that is writable from 
# 'on.php' or 'off.php' scripts in /var/www/
#  -called from webpage /var/www/index.html
#
# gpio setup: Using GPIO block pin 11 which is 
# called GPIO 17. An LED is wired through a 
# 330 ohm resistor to the Ground pin.
#
#   Also: example of sending data to the
#   serial port (-like to the 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)
ser.flushInput()

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')      # -one byte char '0' is sent
    else:
        print("Stopped at: %s" % time.ctime())
        GPIO.output(11, False)
        ser.write(b'1')  # -one byte char '1' is sent
    read_data.close()
    time.sleep(1)