PBP projects for R/C models

[ScaleRobotics]

I made some progress with 5 channel PWM measurement using a single pin. Curently 5 RC channels are being measured using capture on a PIC12f683. Right now, only one channel is being passed through, but it is possible to get a max of 4 channel pass through on this chip. Bruce gave me the idea of measuring all 5 channels on one pin with his remote code learning thread: http://picbasic.co.uk/forum/showthread.php?t=12555

I need to work on getting channel 1 to be recognized as channel 1. Somehow, I need to check for a low on CCP1 for 3ms or so (between channel 5 and channel1). Anyone got a suggestion on how to do this?

Right now, you have to restart the circuit a few times to get channel 1 output to be channel 1 input. It sometimes selects channel2,3,4 or 5 (depends when you turn the chip on, and which rise it sees first). But the output now is pretty rock solid, no jitters.

I tried to label my ASM pretty well, but I need to work on this overall, especially the variables.

total words used = 275

http://scalerobotics.com/PWMpassthrough.html

[Acetronics2]

Hi,

Ok, it's not PBP ... But it does the trick.

http://www.rcgroups.com/forums/showthread.php?t=576165

Alain

[ScaleRobotics]

Hi,

Ok, it's not PBP ... But it does the trick.

http://www.rcgroups.com/forums/showthread.php?t=576165

Alain

Thanks Alain (was that for me, or Ken??),

But I currently am able to encode 1 channel while decoding 5 channels with the below code:

http://scalerobotics.com/PWMpassthrough.html

And soon should be able to add 3 outputs, and have 4 encoded channels out, while decoding 5 channels in with the pic12f683 (and 3 diodes).

But, what I can't get my head around is how to ensure the CCP1 interrupt starts the first time on RC channel 1 (first pulse). It needs to look for a low of 3ms or so, to ensure channel 1 is looking at channel 1.

Oh .... and I need to do this in ASM.

Thanks for any help you can offer.

[Acetronics2]

Hi,

Sorry ... I didn't verify the link ... ( Xtal wrote both enc and dec ...)

those ones are real decoders

Alain

[ScaleRobotics]

Thank you very much Alain, just what I was looking for!

Need to see how they do their "sync gap", but I notice he has a number of other enhancements as well ... interesting.

Walter

[Kenjones1935]

Thanks everyone for working on the RC PWM problems.

Meanwhile I have built a autonomous toy car from the ideas voiced by fritsl in Lets Built Robots.

The DPDT switches work. I have two separate battery packs. The power for the servo and the wheels shares nothing with the power for the PIC and other logic. Not even the ground circuit! This should keep the noise down.

I am using the LED's on the PICkit2 to help debug. At least I can know which routines have been visited. I wish I could figure out a way to know what are in my variables. The USB programmer can read and write all memory locations. Where do I read about real time debugging?

Oh, yes, my new PIC16F887 book arrived via air mail at the Fitchburg, MA Post Office. It is published by MIKROELEKTRONIKA d.o.o in Belgrade, Serbia. How small the world has become.

[Kenjones1935]

That's the word I have been looking for.

Is there a mechanism in PBP for setting break points.

Once that is done, is there an easy way using PICkit 2 Programmer to read the contents of a particular register?

Ken