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PWM to PPM conversion with Arduino

#1
I just saw this blog post this morning. It mentions that there are commercial solutions to do this. If you're into DIY, this could be fun to play with, though. I'm also thinking of the possibilities to do whatever you want to the signals in the process. What comes in via PWM doesn't have to be the same as what goes out via PPM. One input channel to multiple output channels, inverting, mixing, etc.

http://blog.oscarliang.net/build-pwm-ppm-converter-arduino-2-4ghz-receiver/

pwm-ppm-converter-arduino-pro-mini-rx-connection-1024x648.jpg
 
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#2
Very interesting but I am not sure why you are interested in doing this. I can see a modification of this being useful for PWM mixing to other PWM signals or decoding PPM into separate PWM signals. So I see many uses for this general idea so I think it is great that you are posting this, just not sure about using it as shown.