#!/usr/bin/env python 

import time
import mraa


# Sensor initialisation
import 			pyupm_tsl2561
tsl2561Ready	= True

if (tsl2561Ready) :
	# Instantiate a digital light sensor TSL2561 on I2C
	print "initialisation TLS2561"
	lightSensor = pyupm_tsl2561.TSL2561()
	time.sleep (10)


# Value
numberSamples	= 200
valueCount		= 0
valueNow		= 0
valueSum		= 0
valueAvg 		= 0
valueMin		= 32767
valueMax		= 0


# Main loop
while True :
		
	if (valueCount == numberSamples) :
		print
		print "after", numberSamples, "samples (values in lux):"
		print "valueAvg: %5d" % valueAvg, "- valueMin: %5d" % valueMin, "- valueMax: %5d" % valueMax
		valueCount = 0
		
	if (valueCount == 0) :
		valueNow = 0
		valueSum = 0
		valueAvg = 0
		valueMin = 32767
		valueMax = 0
		
	if (tsl2561Ready) :
		valueNow = lightSensor.getLux()
		if (valueNow >= 0) :
			valueCount	= valueCount + 1
			valueSum = valueSum + valueNow
			valueAvg = valueSum / valueCount
			if valueNow < valueMin :
				valueMin = valueNow
			if valueNow > valueMax :
				valueMax = valueNow
	
			now = time.ctime(int(time.time()))
			
			if (valueCount == 1) :
				print
				print "Light (values in lux):"
			print now,"(GMT)",": %5d" % valueNow,"- avg:%5d" % valueAvg,"- min:%5d" % valueMin,"- max:%5d" % valueMax,"-%4d sample(s)" % valueCount
		
	time.sleep(1)