;*******************PIR PASSIVE INFRARED MOTION SENSOR SMART NIGHT LIGHT****************************
;Use a LDR light sensor to turn on a pir motion sensor as it gets darker.  

;Change to have a START_UP_ROUTINE
;Change the LIGHT_THRESHOLD value to turn device LED on when getting dark
;Change the length of TIME the LED turns on 

;Advanced
;Change TWO MODES at power up.  Could have two light_threshold levels 

#Picaxe08M2 				   ;Tells picaxe its a 08M2 chip
;#No_Data 					; shortens the upload process

symbol Light_threshold = b1     ;Create SYMBOL LIGHT_THRESHOLD and give it variable = b1
Light_threshold = 100		;Set the CONSTANT LIGHT_THRESHOLD below which the night light will trigger .
symbol Light_Level = b2            ;Create SYMBOL LIGHT_LEVEL and give it variable = b2	   
symbol Motion = b3 		  ;Create SYMBOL MOTION and give it variable = b3
let b3 = pin3 			     ;make PIN3 = b3

;********MAIN LOOP**************

Main:
b3 = 0 						; reset b3 to 0
b3 = pin3 				  	 ; make PIN3 = b3

gosub check_light_level 	    	  ; goto subroutine CHECK_LIGHT_LEVEL

if light_level < light_threshold then     ; CONDTIONAL Statement, compare light_level to light_threshold
   gosub check_motion 		        ; If light_level is less than light_threshold go subroutine check_motion
endif 						   ; end of if statement

nap 4 						  ; take a low power sleep
goto main

;*******END OF MAIN LOOP***************

Check_Light_Level:
readadc 1, light_level  	;Read the analogue VOLTAGE on PIN1 and PUT INTO VARIABLE "LIGHT_LEVEL"
pause 10
debug
return

;************************************************************************

Check_Motion:

if pin3 = 1 then 		;Check the PIR motion sensor on pin3, High/1 means motion sensor triggered
   pause 20
   debug 
   gosub night_light 		; If motion sensor triggered, then go to subroutine night_light			
endif				   
return				 ;return to Main Loop and check light level

;*************************************************************************

Night_Light:
debug
high 4				;Turn On pin4
wait 5      			   ;LED stays on for 5 seconds
low 4 				;Turn off pin4

goto main
return

;**************************END OF CODE *************************************