$19 DIY channel expander

[incognico]

So you can have 4 more proportional channels with this, using all four analog inputs on pots?

Yes, that would be realitively simple to configure using this approach. You'd want to check there was enough time during the "off" pause to fit the extra channels - otherwise you'd need to generate your own timing and own full signal is software which is complexity I was trying to avoid. From the looks of my saved scope traces, I would be able to fit 4 additional propo channels into my 6-channel JR TX signal with no probs.

[volto]

I see, so adding 4 more channels to a radio that has 7 channels already, may be too long of a PPM frame? Wish I had a scope.

[incognico]

I see, so adding 4 more channels to a radio that has 7 channels already, may be too long of a PPM frame? Wish I had a scope.

Yeah, perhaps - the only experience I've had is with my JR sorry.

Do you have an Arduino kicking around? There's free code & software online to use one as a simple scope. When I first started thinking about this project my oscilloscope was at work so this is what I used - It was absolutely fine for the PPM stuff

I believe there are some simple sound-card-scope instrucitons online too. Haven't tried that myself.