Analog inputs implementation for nrf24-multipro

This project helps to turn cheap RC radio transmitters into multi protocol devices. The idea is to remove embedded controller from an RC transmitter and to use Arduino + NRF24 instead of it. Analog pins A0..A7 of Arduino used to measure voltage on RC stick resistors and buttons. I used DROMIDA Q100 RC transmitter as a base, it already has NRF24 soldered, but it is possible to use almost any RC control with or without NRF24 on it.

Connections

Arduino Uno/Nano	NRF24L01+ Module	nRF Pin No.
GND	GND	1
3.3V	VCC	2
D7	CE	3
D8	CSN	4
D13	SCK	5
D11	MOSI	6
D12	MISO	7
Not Used	IRQ	8

Arduino Uno/Nano	Controller analog
A0	ELEVATOR
A1	AILERON
A2	THROTTLE
A3	RUDDER
A4	BUTTON
A5	BUTTON
A6	BUTTON
A7	BUTTON

Configuration

To configure the app for your hardware change ANALOG_CHANNELS number and a_channels array:

input: A0..A7 used on Arduino; min_val, max_val: values from analogRead when button released/pressed or stcks at the edge positions.

For debugging purpose the app prints some debug information via Serial interface at 115200:

selectProtocol
ppm[RUDDER]:1491
ppm[AILERON]:1503
ppm[ELEVATOR]:1504
ppm[THROTTLE]:1002
NRF24L01 OK
Init PROTO_MJX PROTO_E010

nrf24-multipro

nRF24L01 multi-protocol RC transmitter

Need a module ?

Current build status

Binding Procedure

• Create a model in OpenTX using external module in PPM mode, 12 channels and TAER sequence order.
• Turn off Taranis.
• Power up quad.
• While holding the appropriate stick pattern listed below, power up Taranis.
• Arm quad based on it's firmware's specification.

Protocol is selected with stick position at startup:

• Rudder left + Aileron left = Bayang protocol with Silverware telemetry for OpenTX
• Rudder right + Aileron right + Elevator down = EAchine E010, NiHui NH-010, JJRC H36 mini
• Rudder right + Aileron right + Elevator up = FQ-777-124 Pocket Drone
• Rudder right + Aileron left + Elevator up = CX-10 older red PCB/CX11/CX205/CX30, JXD389/391/393, SH6057/6043/6044/6046/6047, FY326Q7, WLToys v252 Pro/v343, XinXun X28/X30/X33/X39/X40
• Rudder right + Aileron left + Elevator down = WLToys V930/931/939/966/977/988
• Rudder right + Elevator down = HiSky RXs, HFP80, HCP80/100, FBL70/80/90/100, FF120, HMX120, WLToys v933/944/955
• Rudder right + Elevator up = Syma X5C (older model), X2 ...
• Rudder right + Aileron right = MJX X600
• Rudder right + Aileron left = EAchine H8 mini 3D, JJRC H20/H22
• Elevator down + Aileron left = Syma X5C-1/X11/X11C/X12
• Elevator down + Aileron right = Attop YD-822/YD-829/YD-829C ...
• Elevator up + Aileron right = EAchine H8(C) mini, BayangToys X6/X7/X9, JJRC JJ850, Floureon H101, BWhoop B03 ...
• Elevator up + Aileron left = EAchine H7
• Elevator up = WLToys V202/252/272, JXD 385/388, JJRC H6C, Yizhan Tarantula X6 ...
• Elevator down = EAchine CG023/CG031/3D X4
• Aileron left = Cheerson CX-10 green pcb
• Aileron right = Cheerson CX-10 blue pcb & some newer red pcb, CX-10A, CX-10C, CX11, CX12, Floureon FX10, JJRC DHD D1

Last used protocol is automatically selected if stick is in neutral position.

Extra features (if available on aircraft):

• Channel 5: led light, 3 pos. rate on CX-10 and FQ777-124, H7, inverted flight on H101
• Channel 6: flip control
• Channel 7: still camera
• Channel 8: video camera, pitch trim (FQ777-124)
• Channel 9: headless
• Channel 10: calibrate Y (V2x2), pitch trim (H7), RTH (H8 mini/H20, FQ777-124), 360deg flip mode (H8 mini 3D/H22)
• Channel 11: calibrate X (V2x2), roll trim (H7,FQ777-124), emergency stop (BWhoop B03)
• Channel 12: Reset / Rebind