Interface LDR module with NodeMCU

18th January 2020 Harshvardhan Mishra

In this Tutorial we will learn how to Interface LDR module with NodeMCU. We need Arduino IDE and LDR Sensor only for this tutorial. this is simple tutorial. We print value on serial console only.

What is a Light Dependent Resistor or a Photo Resistor?

A Light Dependent Resistor (LDR) or a photo resistor is a device whose resistivity is a function of the incident electromagnetic radiation. Hence, they are light sensitive devices. They are also called as photo conductors, photo conductive cells or simply photocells. They are made up of semiconductor materials having high resistance.

We are using LDR module in this tutorial.

Hardware Required:

NodeMCU
LDR / photoresistor
Breadboard
Micro USB cable
Connecting Wires

Software Required:

Arduino IDE (with ESP8266 Library installed) Visit this : Arduino Support for ESP8266 with simple test code

We are using LDR module So you can connect to the A0 pin of the NodeMCU. We are using Analog pin in this tutorial.

Arduino IDE Sketch for Interface LDR module with NodeMCU:

/*
* Interface LDR with NodeMCU
* By TheCircuit
*/
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}

void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);

// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
float voltage = sensorValue * (5.0 / 1023.0);

// print out the value you read:
Serial.println(voltage);
}

Connections:

LDR NODEMCU

VCC ==> 3.3V

GND ==> GND

A0 ==> A0

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