ESP8266 Witty cloud Arduino ESP8266 Friendly Board

LDR = A0; RED = 15; GREEN = 12; BLUE = 13; BUTTON = 4;

int ldr = A0;
int r = 15;
int g = 12;
int b = 13;
int button = 4;
int stage = 0;
void setup() {
pinMode(ldr, INPUT);
pinMode(button, INPUT);
pinMode(r, OUTPUT);
pinMode(g, OUTPUT);
pinMode(b, OUTPUT);
for (int i = 0; i < 3; i++) {
nextState();
delay(500);
}
led(0, 0, 0);

}
void loop() {
Serial.begin(115200);
int ldr_value = analogRead(ldr);
int btn = digitalRead(button);
Serial.print("LDR is ");
Serial.println(ldr_value);

if (btn == 0) {
Serial.println("Button press");
setLED(ldr_value);
} else {
led(0, 0, 0);
}
delay(200);
}
void led(int red, int green, int blue) {
digitalWrite(r, red);
digitalWrite(g, green);
digitalWrite(b, blue);
}
void nextState() {
if (stage == 0) {
led(1, 0, 0);
} else if (stage == 1) {
led(0, 1, 0);
} else if (stage == 2) {
led(0, 0, 1);
} else if (stage > 2) {
stage = -1;
led(0, 0, 0);
}
stage++;
}
void setLED(int value) {
if (value > 550) {
led(1, 0, 0);
} else if (value > 300) {
led(0, 1, 0);
} else {
led(0, 0, 1);
}
}

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