Скачать или смотреть HOW TO USE LASER + LDR WITH ESP8266 , GREEN AND RED LED , Check ARDUINO CODE BELOW

Laser + LDR (Esp8266)

LDR
VCC-3.3V
GND-GND
D0-D6(GPIO12)

Laser
VCC - VIN(5V from USB)
GND-GND
SIG(Optional) - D5(GPIO14)

Green LED
Long(+) - D2(GPIO4)
Short(-) - GND

Red LED
Long(+) - D1(GPIO5)
Short(-) - GND



Arduino code

const int ldrDigitalPin = 12; // D6 (GPIO12) connected to LDR D0
const int greenLedPin = 4; // D2 (GPIO4) for GREEN LED
const int redLedPin = 5; // D1 (GPIO5) for RED LED
const int laserPin = 14; // D5 (GPIO14) optional laser control

void setup() {
pinMode(ldrDigitalPin, INPUT);
pinMode(greenLedPin, OUTPUT);
pinMode(redLedPin, OUTPUT);
pinMode(laserPin, OUTPUT);

digitalWrite(laserPin, HIGH); // Turn laser ON
digitalWrite(greenLedPin, LOW); // Start with both LEDs OFF
digitalWrite(redLedPin, LOW);

Serial.begin(9600);
}

void loop() {
int lightDetected = digitalRead(ldrDigitalPin);

Serial.print("Laser Detected (D0): ");
Serial.println(lightDetected);

if (lightDetected == HIGH) {
// Laser hits LDR → GREEN ON, RED OFF
digitalWrite(greenLedPin, HIGH);
digitalWrite(redLedPin, LOW);
} else {
// Laser blocked → RED ON, GREEN OFF
digitalWrite(greenLedPin, LOW);
digitalWrite(redLedPin, HIGH);
}

delay(100);
}




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