import mraa
import time

# This is a simple light switch code
# connect Touch Sensor to the D4 and the Relay to the D8

# inside a python interupt you cannot use 'basic' types so you'll need to use objects
class Toggle:
  state = 0

t=Toggle()

# D8 for the relay
mraa.Gpio(8).dir(mraa.DIR_OUT)

# D4 for the touch sensor
mraa.Gpio(4).dir(mraa.DIR_IN)

def pressed(args):
  if t.state==0:
    mraa.Gpio(8).write(1)
    t.state = 1
  else:
    mraa.Gpio(8).write(0)
    t.state = 0

# here the interrupt is set on Gpio(4)
# fourth argument is not used
mraa.Gpio(4).isr(mraa.EDGE_RISING, pressed, pressed)

# Delay destructors on script termination otherwise ISR will not run
time.sleep(60)