#PICAXE 08M 
‘Sample HopeRF HH10D humidity module program for June 2009 SiChip
‘Ref resources => www.picaxe.orconhosting.net.nz/hopehum.htm
‘IO DEFINITIONS 
SYMBOL humid        = 3
‘
‘ VARIABLE DEFINITIONS 
SYMBOL axefactr    	= b2
SYMBOL Soh	= w2	‘w2 = b5:b4		
SYMBOL diff	= w3	 ‘w3 = b7:b6
SYMBOL RH	= w4	‘w4 = b9:b8
‘
‘ CONSTANTS -strictly need to be read via I2C for each module, but can be assumed close
SYMBOL Offset   	= 7709	‘HH10D offset calibration constant - a second module has 340
SYMBOL Sens	= 341	‘HH10D sensitivity calibration constant - a second module has 7762
‘ 
‘ MAIN PROGRAM
Main:
      COUNT humid, 1000, Soh	‘read the frequency (ie cycles in 1 second)   
      diff = Offset - Soh
      axefactr = diff / 19 + 1          	‘factor prevents number roll over error if >65535
      RH = 10 * Diff / axefactr * Sens  	‘int. result (x10 gives possible 0.1 resolution)
      axefactr = 4096 / axefactr     	‘a factor to prevent number roll over error
      RH = RH / axefactr         	‘final value for RH%
      RH = RH / 10         	‘divide by 10 (for now) as just whole integer RH%
      SEROUT 1, N2400, (“RH% = “, #RH)
      PAUSE 5000                        	‘wait for 5 seconds until next reading
GOTO Main