quickwink.py

import math
from time import sleep
import os

PIN_LED_R = 23
PIN_LED_G = 25
PIN_LED_B = 18

PB_DEVICE = '/dev/pi-blaster'

def interface(stmt):
	pb = os.open(PB_DEVICE, os.O_SYNC|os.O_WRONLY|os.O_TRUNC)
	try:
		os.write(pb, stmt + '\n')
	except:
		raise
	finally:
		os.close(pb)

def capture(pin):
	setvalue(pin, 1)

def release(pin):
	setvalue(pin, 0)
	interface('release {pin:d}'.format(pin=pin))

def setvalue(pin, value):
	if value >= 0 and value <= 1:
		interface('{pin:d}={value:f}'.format(pin=pin, value=value))
	else:
		raise ValueError('Value must be between 0 and 1 inclusive')


if __name__ == '__main__':
	capture(PIN_LED_R)
	capture(PIN_LED_G)
	capture(PIN_LED_B)

	i = 0

	try:
		while True:
			for j, p in [(3, PIN_LED_R), (4, PIN_LED_G), (5, PIN_LED_B)]:
				v = math.fabs(math.sin((i+(30*j))/30.0))

				print('pin{pin} value={value}'.format(pin=p, value=v))
				setvalue(p, v)

			i += 1

			sleep(0.0167)
	except:
		raise
	finally:
		release(PIN_LED_R)
		release(PIN_LED_G)
		release(PIN_LED_B)