X9D+ 使用NRF24L01 (v2x2 protocol)控制jj1000

整體架構大致如下，架構還蠻簡單的

1. X9D+ 遙控器輸出電源與PPM訊號
2. Arduino 
1. 負責選擇protocol
2. 控制NRF24L01對頻
3. 收PPM訊號，解析出來
1. http://ddddiy.blogspot.tw/2016/08/arduino-ppm.html
4. 透過NRF24L01傳送各通道訊號

目前可以動了，但有幾個問題

1. jj1000 led 燈幾秒會閃一下
2. 不動時，有時油門會突然稍微轉一下
1. 目前懷疑控輸出的PPM 有問題，導致arduino 計算錯誤
3. 上面兩個問題可以調整timing解決
1. http://ddddiy.blogspot.tw/2016/08/arduino-ppm.html

jj1000 對頻方法

1. jj1000 開機
2. 遙控端切換protocol(PROTO_V2X2, 值為0, 我修改的code 可以印出debug message)
1. 按著前傾
2. ch12最大

https://www.facebook.com/groups/350319041794981/permalink/550183148475235/

X9D	Leonardo	NRF24L01
PPM(pin1)	pin2
Vout(battery voltage, pin3)	Vin
GND(pin4)	GND	GND
	SPI-MISO(pin14)	MISO
	SPI-MOSI(pin15)	MOSI
	SPI-SCK(pin16)	SCK
	pin9	CE
	pin10	CS
	3.3V	VCC
	DBG(pin6 to 5V or 0V)

我的code(porting to Arduino Leonardo)

Use D:\work\arduino\arduino-1.6.8

https://github.com/cy-arduino/nrf24_multipro

porting to arduino leonardo

1. change pin define
2. add debug function and dynamic debug message
- set DBG_ON=1 in source code
- connect DBG_pin(enable debug) to VCC or GND(disable debug)
3. abstract PPM_INPUT_MIN/MAX
4. fix bug about PPM ISR setup
- use digitalPinToInterrupt(PPM_pin)
5. increase throttle safe check delay to 1s

來自 <https://github.com/cy-arduino/nrf24_multipro/commit/8c776f6ef0f2fd794154fa3c51ff08ce60b72803>

原始github source

https://github.com/goebish/nrf24_multipro

nrf24l01 pin define

除了AETR前四個通道，其餘通道功能如下(依協定不同有些微差異)

Channel 5: led light, 3 pos. rate on CX-10, H7, inverted flight on H101

Channel 6: flip control

Channel 7: still camera

Channel 8: video camera

Channel 9: headless

Channel 10: calibrate Y (V2x2), pitch trim (H7), RTH (H8 mini/H20), 360deg flip mode (H8 mini 3D/H22)

Channel 11: calibrate X (V2x2), roll trim (H7)

Channel 12: Reset / Rebind













reference:
    遙控器輸出PPM格式 http://www.geek-workshop.com/thread-2408-1-1.html