RC transmitter with 1 to 7 channels

Hardware includes nRF24L01+ transceiver and ATmega328P processor.

Telemetry monitors receiver voltage using LED indication.

This RC transmitter works with RC receiver from my repository RX_nRF24_Stanek

The code is Arduino.

LED mode

• Normal mode, LED is lit
• If the TX battery is low, the LED blink at 0.5s interval
• If the RX battery is low, the LED blink at 0.3s interval
• If we lose RF data for 1 second, the LED blink at 0.1s interval

Calibration

• Hold calibration button, switch transmitter TX on, still holding calibration button move all controls to extremes.
• Center all controls.
• Release calibration button (saved to eeprom).

Servo reversing

• To reverse the desired channel, hold the joystick in the end position and turn on the TX transmitter (saved to eeprom).

Arduino pins

Pots:
Number of channels according to control elements (possible combination, max. 7)
A0 to A6

D4 - calibration button
D6 - LED
A7 - input TX battery

nRF24L01:
D9  - CE
D10 - CSN
D11 - MOSI
D12 - MISO
D13 - SCK