BLINKR/Transmitter Code at master · creative-motion/BLINKR · GitHub

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#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

#define LEFT 9
#define CENTER 3
#define RIGHT 4
#define OFF 0
#define PURGATORY -1
#define ON 1

#define CE 7
#define CSN 8

#define BAUDRATE 57600

RF24 radio(CE, CSN);
const byte address[6] = "00001";

int left_state = OFF;
int right_state = OFF;
int center_state = OFF;

int payload = 0;
int prev_payload = 0;
// 0 - no button pressed; 1 - button pressed
int buttons_state = OFF;
int blink_leds = 0;

void set_pins() {
  pinMode(LEFT, INPUT);
  pinMode(CENTER, INPUT);
  pinMode(RIGHT, INPUT);
}

void set_radio() {
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
}

void reset_states() {
  left_state = OFF;
  center_state = OFF;
  right_state = OFF;
}

int set_payload_value() {
  int left = digitalRead(LEFT);
  int center = digitalRead(CENTER);
  int right = digitalRead(RIGHT);

  if (left) {
    payload = LEFT;
  } else if (center) {
    payload = CENTER;
  } else if (right) {
    payload = RIGHT;
  } else {
    payload = OFF;
  }
}

void recheck_pins_state() {

}

void set_payload() {


}

void setup() {
  Serial.begin(BAUDRATE);
  Serial.println(">>>>>>>>>>>> SETUP  <<<<<<<<<<<<<");

  set_pins();
  set_radio();

}

void loop() {
  Serial.print("Before ");
  Serial.println(payload);
  set_payload_value();
  // TODO : Must find a way to optimise the sending.
  //        When is OFF is do not send more than twice
    Serial.print("After ");

  Serial.println(payload);
  radio.write(&payload, sizeof(int));
  delay(200);
}