Arduino-Phillips-Hue/LED_Test.ino at master · domrest/Arduino-Phillips-Hue · GitHub

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#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include "../generic/common.h"

#define PIN_WIRE_SDA (4)
#define PIN_WIRE_SCL (5)

static const uint8_t D0   = 16;
static const uint8_t D1   = 5;
static const uint8_t D2   = 4;
static const uint8_t D3   = 0;
static const uint8_t D4   = 2;
static const uint8_t D5   = 14;
static const uint8_t D6   = 12;
static const uint8_t D7   = 13;
static const uint8_t D8   = 15;
static const uint8_t D9   = 3;
static const uint8_t D10  = 1;

#endif /* Pins_Arduino_h */

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(D7,INPUT_PULLUP);

}

int check = 0;
int current = 0;

void loop() {
  // put your main code here, to run repeatedly:
  check = digitalRead(D7);
  if (check == LOW){
    if (current == 1){
      digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
                                    // but actually the LED is on; this is because
                                    // it is acive low on the ESP-01)
      current = 0;
    }
    else if (current == 0 ){
      digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
      current = 1;
    }
    delay(250);
  }
}