RE: nRF5x as a RC receiver with RC transmitter

Luis — Thu, 17 Mar 2016 12:06:47 GMT

Great answer. Thanks for pointing out difficulties and showing me that thread with useful info. Right now I am reading PWMs from receiver, just wanted to try to simplify it. Adding a new transceiver chip is not an option right now, that is what you suggested about A7121 right? I will ask turnigy about their protocol, but I am pretty sure they wont share it due to safety reasons. Because knowing protocol I could maybe hack other communications, is it like this? Thank you again

RE: nRF5x as a RC receiver with RC transmitter

Anders Strand — Thu, 17 Mar 2016 11:55:34 GMT

Hello.

Without knowing the radio protocol spec of the transmitter, this is virtually impossible. Things that would have to match is: Data rate, packet structure, modulation method, frequency deviation and channel spacing.

You can extract this information by looking at the signal from a transmitter using an advanced frequency analyzer. You could also ask Turnigy if they want to share the protocol with you.

You can read about the radio in the nRF5 devices here. It uses GSFK modulation, and can use up to 2mpbs data rate.

If your goal is to connect a transmitter to an nRF5 in any way, you can always get a very small receiver and read the PWM output with the nRF5 chip.

According to this thread, some Turnigy devices use an A7121 tranceiver chip. You might have better luck using one of these chips, then you are left with decoding the packets that come in. This might also be a big task :)

-Anders