What am I doing wrong ?

[paul borgmeier]

change this

if i = 255 then goto down

to this

if i = 0 then goto down

and all should be well .....

or better yet delete the line (it adds no value) and replace the last line of the program shown with this

goto main

(instead of the if-then, which adds no value)

Paul Borgmeier
Salt Lake City, Utah
USA

[Acetronics2]

Hi, Malc

Don't you think a simple triangle slow wave generator based upon a 555 or a twin AOP could perfectly do the job ???

Note a simple bulb lamp could also do all the job itsef ... with a rectangular wave input.

mmmmh, back to the original idea ... you'll have to seriously slow down the PWM change rate ...

May be intended for some stop light for road/rail crossing, I presume ???

Alain

PS : and why not use a lookup table, just to reproduce exactly the truth ( exponential rise and fall of enlightment ) ???
just a " particular shape " wave generator ...in fact.

[malc-c]

Hi, Malc

Don't you think a simple triangle slow wave generator based upon a 555 or a twin AOP could perfectly do the job ???

Note a simple bulb lamp could also do all the job itsef ... with a rectangular wave input.

Quite possibly, however that wouldn't improve my understanding of PBP

May be intended for some stop light for road/rail crossing, I presume ???

Errr.. actually you don't want to know... Oh well all right..

A friend wants to model the Tardis from the BBC series Dr Who... and it has a slow pulsing light on top..... me and my big mouth offered to help, and like I said it works fine on a 16F628a, but I just need to port it to a 12F675

Malc

[Acetronics2]

Hi, Malc

That's a bit more complicated ... as Dr Who is completely unknown here !!!

May be some more info about that light timing and appearance ( flash, slow rise and fall, Pulsing light ....) could help us to help you ...

Alain

[malc-c]

Hi, Malc

May be some more info about that light timing and appearance ( flash, slow rise and fall, Pulsing light ....) could help us to help you ...

Alain

I was going to attach a short avi (DVIX codec) of the result I have with the 16F628a chip, which is exactly what my friend wants..., but even zipped its slightly more than the max 200K limit we're allowed to upload. If I can't get the 12F675 working I'll just mail him the '628 chip and save all the headache !