ESP32 - Door Sensor - LED

We are going to learn how to:

We will learn how to toggle LED each time door is closed in ESP32 - Door Sensor Toggles LED tutorial.

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×Door Sensor
1×LED
1×220 ohm resistor
1×Breadboard
4×Jumper Wires
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About LED and Door Sensor

If you do not have knowledge of LED and door sensor (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:

Wiring Diagram

ESP32 Door Sensor LED Wiring Diagram

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ESP32 Code

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-door-sensor-led */ const int DOOR_SENSOR_PIN = 13; // ESP32 pin connected to the OUTPUT pin of door sensor const int LED_PIN = 3; // ESP32 pin connected to LED's pin int doorState; void setup() { Serial.begin(9600); // initialize serial pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP); // set ESP32 pin to input pull-up mode pinMode(LED_PIN, OUTPUT); // set ESP32 pin to output mode } void loop() { doorState = digitalRead(DOOR_SENSOR_PIN); // read state if (doorState == HIGH) { Serial.println("The door is open");; digitalWrite(LED_PIN, HIGH); // turn on LED } else { Serial.println("The door is closed"); digitalWrite(LED_PIN, LOW); // turn off LED } }

Quick Steps

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE, select the right ESP32 board and COM port
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Arduino IDE Upload Code
  • Move the magnet close to the reed switch and them move it far from the reed switch.
  • See the change of LED's state

Code Explanation

Read the line-by-line explanation in comment lines of source code!

Video Tutorial

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