 
 #define PIN_CE  7
 #define PIN_CSN 8
-#define PIN_MONITOR_SS 4
 
 #define PIN_THROTTLE A0
 #define PIN_YAW      A1
 #define PIN_PITCH    A2
 #define PIN_ROLL     A3
 
+#define PIN_SWITCH_A 2 // (PD2 - PCINT18)
+#define PIN_SWITCH_B 3 // (PD3 - PCINT19)
+#define PIN_SWITCH_C 4 // (PD4 - PCINT20)
+#define PIN_SWITCH_D 5 // (PD5 - PCINT21)
+#define PIN_SWITCH_E 6 // (PD6 - PCINT22)
 
 RF24 radio(PIN_CE, PIN_CSN);
 

  }
  
  unsigned long now = millis();
  if ( now - ppsLast > 250 ) {
    pps = ppsCounter;
    ppsLost = ppsLostCounter;


void setup() 
{
  // Push button switches
  pinMode(PIN_SWITCH_A, INPUT_PULLUP);
  pinMode(PIN_SWITCH_B, INPUT_PULLUP);
  pinMode(PIN_SWITCH_C, INPUT_PULLUP);
  pinMode(PIN_SWITCH_D, INPUT_PULLUP);
  pinMode(PIN_SWITCH_E, INPUT_PULLUP);
  
  Serial.begin(115200);
  
  if (DEBUG) {
