"Hi Bill,
Thanks for your suggestions.
As soon as I get home, I'll surely try on low voltage power supply.
The strange thing that I've haven't already figured out, is why input 1 and 2 had no problem at all!
I know that the first 2 inputs are on one…"

"Hi Bill,
I really need some assistance.
I've tested so far 4(!!) different red boards, but no one seemed to correctly parse the signal on input 3 and 4.
I tested them using stock sparkfun self-test firmware and also with self-compiled test firmware…"

"Hi Bill,
We recently bought a UAV Dev Board from sparkfun, but we noticed that inputs 3 and 4 don't work...
Even debugging the application resulted in associated variables equals to 0 (counted pwm pulse length).
Inputs 1 and 2 instead are perfect!…"