Multiple PWM and port C

[Scampy]

Hi,
Took a quick look at the code you PM'd me and found this:

'If light=1 then                         ' If the variable is 1 then output full PWM to lights
'    hpwm 1,255,200        
'    hpwm 2,255,200
'endif
'If light=0 then                       ' If the variable is low then set value to 0 an turn off the lights
'    hpwm 1,0,200        
'    hpwm 2,0,200    
'endif

If this is where you're trying to set 100% dutycycle but ends up with a "jumpy" signal not at 100% then the problem is most likely that you're trying a frequency (200Hz) far below the specified minimum. If you look at the manual you'll see that for a 18F device running at 20MHz the minimum frequency is 1221Hz.

The only other place in the code where HPWM was used had a frequency of 5kHz so that should've worked - did it?

/Henrik.

Hi,

That section had been commented out from when I was using the hardware modules. It was intended as a manual over-ride so that I could turn the lights on or off via the push of a button. I never ran the module at high frequencies as the LED driver requires a PWM frequency of 100 hz - 1khz and at 1 Khz they resonated with a high pitched sound.

The original code had

'*******************************************************************************
'Send pulses to drivers

    hpwm 1,W_PWM,200        
    hpwm 2,B_PWM,200
    
'*******************************************************************************

Where W_PWM and B_PWM increased from 0 to 255 or decreased from 255 to 0 to fade the LEDs up and down