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Re: [Paparazzi-devel] PPM wiring

From: David Conger
Subject: Re: [Paparazzi-devel] PPM wiring
Date: Wed, 20 Apr 2011 10:54:26 -0700


The only time to worry about 168 or 328 is when you must choose the right file to program it (done by the person who assembles it). After don't worry about it. 

Let's go high level and maybe I can help you and others about this. 

Your Tx outputs a combined signal with all 8 (or more) channels. The autopilot needs all of these also as one combined signal. Your Receiver has only individual channel outputs (labled 1,2,...8) ... so, how do you get each individual PPM signal to the autopilot as only a single combined signal? Well, Chris (hendrix) found us a way a long time ago using an ATMEGA to take each individual one and combine it and output it. So you'll find many intputs on the encoder and a single 3 wire output. Make sense? 

How you wire from your Rx to the Encoder is your way of manipulating that combined signal. If you want Ch5 on the combined signal to be a 3-pos switch that is say ch7 on the Tx then take the ch7 output from the Rx and connect it to the Ch5 input on the encoder. Voila. Ch5 is that 3-pos switch now as far as the autopilot knows. 

Best regards,
David Conger/PPZUAV

On Apr 10, 2011, at 11:02 AM, Roman Nikitin wrote:

Hi all,
I did use ATmega168 PPM encoder before and it seems to be damaged now. So I ordered a newer one that is ATmega328. I am confused a bit, it is not clear how to wire it?! Three wires (+,-, signal) goes to the ap board, for another wires there is one +, one - , and 8 holes for the signals. I found this picture  and I am not sure now, how should I do a wiring. In 168 version each of the channels had power, ground and signal  which are going to R/C receiver. Does it mean here that the R/C receiver will be powered just from one wire with one ground wire?! , and for other channels signal wires must be connected only?!
Please, I need some help with it. I  have not found any instructions how to do it.
It would be nice to have a better picture with some instructions to it.  Just sent it to my private e-mail if you have some or may be a link.
Thank you.
Bristol Institute of Technology
University of the West of England
Aerospace Systems Engineering
tel. +44 (0) 7760806643
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