/*
arduino aircraft lighting
contains various bits that were ripped from strandtest, forum.arduino.cc, arduino IDE
examples, and others, then heavily cut down and commented to the best of my ability.

modify this to suit your needs, it's working fine for me now.

 -floz
*/

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif

//data-pin for the neopixels (output)
#define PIN 6

//channel on your hobby receiver connects to this digital pin (input)
#define PWM_SOURCE 5

//how long between strobe flashes/battery checks
const long interval = 3750;
//timer var
unsigned long previousMillis = 0;

//el togglodyte supremo!
int LightState = 1;
int LastLightState = 0;

//magic sauce
Adafruit_NeoPixel strip = Adafruit_NeoPixel(2, PIN, NEO_GRB + NEO_KHZ400);


void setup()
{

    strip.begin(); // init required?
    strip.show(); // Initialize all pixels to 'off'
    Serial.begin(9600); // start serial output
}
void nav_lights(){
  //red/green FAA style with added strobe
    strip.setPixelColor(0, 0,255,0);
    strip.setPixelColor(1,255,0,0);
    strip.show();
    delay(250);

}
void landing_lights(){
  //bright warm white
   strip.setPixelColor(0, 255,255,196);
      strip.setPixelColor(1, 255,255,196);
      strip.show();
      delay(250);
}
void battery_timer(){
  //after x minutes (default 10) give the pilot a friendly warning flash
      Serial.print(millis());
      Serial.println(" battery warning - uptime exceeds 10 mins!!!");

      strip.setPixelColor(0, 255,255,0);
      strip.setPixelColor(1, 0,0,0);
      strip.show();
      delay(150);
      strip.setPixelColor(1, 255,255,0);
      strip.setPixelColor(0, 0,0,0);
      strip.show();
      delay(150);

 }

void strobe(){
  // added strobe thingie
      Serial.println(" MS do strobe");

      strip.setPixelColor(0, 255,255,255);
      strip.setPixelColor(1, 255,255,255);
      strip.show();
      delay(100);
      LightState = LastLightState;
}

void loop() {
//the rest of this is kind of sloppy, but it seems to work.
     if (LightState == 1){
      nav_lights();
    }
    if (LightState == 0){
      landing_lights();
    }


 unsigned long currentMillis = millis();
   //someone else's work, from blinkwithoutdelay example.
  if (currentMillis - previousMillis >= interval) {

    // this huge number (600000) is ten minutes in milliseconds
  if (millis() >= 600000){
        battery_timer();
        return;     //ymmv, comment out?
     }
   Serial.print(millis());
   // save the last time you blinked the strobe
     previousMillis = currentMillis;
     if (LightState == 0){
      //if we're using landing lights, don't bother.
      Serial.println(" MS no strobe");
      return;
     }
     LastLightState = LightState; //var to return to nav lights after strobe
     strobe(); //give us a quick flash
  }

    int pwmin = pulseIn(PWM_SOURCE, HIGH, 20000); //read the PWM line (default pin 5)
     if (pwmin >=  1400){                         //from the hobby receiver
     LastLightState = LightState;                 // 1400 worked for me with a toggle
     LightState = 0; //landing lights             // switch on a flysky fs-t6
     if (LastLightState != LightState){           // ymmv, down position was ~980 and
     Serial.print(pwmin);                         // up position was ~1900 on my gear
     Serial.println(" PWM landing lights");
     }                                            // all to toggle the lights
     }else{
     LastLightState = LightState;                 //    <--- toggle t'other way
     LightState = 1; //nav lights
     if (LastLightState != LightState){           // aren't you glad i added
     Serial.print(pwmin);                         // really verbose serial output now?
     Serial.println(" PWM nav lights");
     }
   }

 }