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This is a simplified build of goebish's nRF24 multi-protocol RC transmitter for OpenTX enabled transmitters with external RF support such as the FrSky Taranis.
The Arduino Nano provides a 3.3v which makes it an ideal choice with the nRF24 module. However the nRF24L01 is 5v tolerant, it is preferable to use 3.3v from the Arduino to power it.