Aquarium Lighting project - PWM - Need some assistance as I'm rusty !

[Scampy]

I found DT's slow PWM (http://www.pbpgroup.com/modules/wfse...hp?articleid=6) maybe that would be the answer ??

[Scampy]

OK I've re-written the code to use the multiple spwm routine produced by DT, but still can't get the delay working right.

This is the routine that calculates the fade (or pause duration) for the dutycycle

Fade:
    Vb_1 = ((B_Day_On_H - B_Dawn_On_H)*60)       ' difference between day start and dawn start hour, converted to min
    Vb_2 = (B_Day_On_M - B_Dawn_On_M)            ' difference between day start and dawn start mins 
    Vb_5 = (Vb_1+Vb_2)*60                        ' Get total duration time in seconds
    Vb_6 = B_Max - B_Min                         ' Work out the 'distance' the lights go from min to max
    B_Fadein_Time = Vb_5 / Vb_6                  ' Get number of seconds between each PWM pulse

Setting the dusk start time to 8:00 and the day on time to 8:05 I get the following results for the variables (B_Min = 0 and B_Max = 255) on the LCD

Vb_5 = 600
Vb_6 = 255
B_Fadein_time = 2

I then have the following statement which should increment the duty cycle until it reaches 255, with each cycle paused 2 seconds

 case DAWN

    lcdout $FE,$94,"BLUE: DAWN "
    DutyCycle1 = DutyCycle1 +1
    pause B_Fadein_Time
    if DutyCycle1=B_Max then
    Blue_Day_Cycle = DAY
    endif

However when run the duty cycle cycles from 0 to 255 so fast you can hardly notice it. Right, so the pause 2 statement is going to be too low, as pause 1000 equates to 1 second, so I multiplied the result by 1000 - the net result was too slow, it never reached 255 by the time the 5 minutes were up. Doing the maths I need to divide 600 seconds by 255 steps = 2.352941176470588. So I really need to convert this to a manageable number, say 2.353. ( B_Fadein_time is a word variable so should be able to store that result), and then convert this into seconds to use in the delay loop, but in a way that actually works !

Assistance would be appeciated

[Scampy]

Seems this place is not what it used to be... almost a 100 views and not one comment or suggestion.

[Normnet]

This may be of little help but the upcoming FineLineIDE detected 3 unused labels:
Ln 213 code_start:
Ln 215 SetupPreset:
Ln 463 MyTimer:

Norm

[Scampy]

This may be of little help but the upcoming FineLineIDE detected 3 unused labels:
Ln 213 code_start:
Ln 215 SetupPreset:
Ln 463 MyTimer:

Norm

Thanks for the comment, but as you say, not a lot of help. The first two simply are place makers... the latter is a routine that exists as a subroutine prior to the clock read routine and is referenced as part of the setup of the interrupts - I'll think I'll stick to Microcode Studio as my IDE ;-)