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'PICAXE-08M E-BIKE CODE '
'       21-6-09         '
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FirstPowerUp:                                    'This is so the bike doesn't bolt from under you if the throttle is
Gosub ReadThrottle                               'on when powering up!
If W1 > 100 then Goto FirstPowerUp

Chopper:                                          
Gosub ReadThrottle                               'Reads the Hall Effect throttle value. (0 - 1023 in theory! More like 15 to 995) 
If W1 < 25 then Gosub ZeroThrottle               'Zero out the throttle value if it's already a very low value.
If Input3 = 0 And W1 > 200 then Gosub HighTemp   'Only go about 1/4 speed if the heat sink temp switch opens. 
Pwmout 2, 250, W1                                'This is where it all happens. 
Poke $12, $06                                    'Pokes the TCON register to prescale the PWM by 16:1 ratio. Now pulses down to 250Hz.
Goto Chopper 

ReadThrottle:
Readadc10 1, W1                                  'Read the throttle value and put it into word varible "W1".
W1 = W1 - 20                                     'Trying to scale the throttle as these Hall Effect throttles are not perfect!
W1 = W1 * 20/19
If W1 > 1023 then Gosub MaxThrottle              'Hold the value to 1023 if it goes higher then 1023.   
Return

ZeroThrottle:                                    'Zero out the throttle value to zero if required.
W1 = 0
Return

MaxThrottle:                                     'Maximin throttle value to be held at 1023.
W1 = 1023
Return

HighTemp:                                  
W1 = 200                                         'Hold the bike speed to about a 1/4 if the high temp switch opens.
Return