/* * Interface InfraRed Sensor Using NodeMCU * By TheCircuit * Red : 5V * Brown: Sensor output * Black : Ground */ int ledPin = 12; // choose pin for the LED int inputPin = 13; // choose input pin (for Infrared sensor) int val = 0; // variable for reading the pin status void setup() { pinMode(ledPin, OUTPUT); // declare LED as output pinMode(inputPin, INPUT); // declare Infrared sensor as input } void loop() { val = digitalRead(inputPin); // read input value if (val == HIGH) { // check if the input is HIGH digitalWrite(ledPin, LOW); // turn LED OFF } else { digitalWrite(ledPin, HIGH); // turn LED ON } }