ESP8266 - Motion Sensor - LED

This tutorial instructs you how to use ESP8266 and motion sensor to control LED. In detail:

This can be applied in an automation process that triggers actions upon detecting human presence.

Hardware Preparation

1×ESP8266 NodeMCU
1×Micro USB Cable
1×HC-SR501 Motion Sensor
1×LED
1×220 ohm resistor
1×Breadboard
1×Jumper Wires
1×(Optional) 5V Power Adapter for ESP8266
1×(Optional) ESP8266 Screw Terminal Adapter

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
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Overview of LED and Motion Sensor

If you are unfamiliar with LED and motion sensor (including pinout, functionality, programming, etc.), the following tutorials can help:

Wiring Diagram

The wiring diagram between ESP8266 NodeMCU and Motion Sensor LED

This image is created using Fritzing. Click to enlarge image

See more in ESP8266's pinout and how to supply power to the ESP8266 and other components.

Initial Setting

Time Delay AdjusterScrew it in anti-clockwise direction fully.
Detection Range AdjusterScrew it in clockwise direction fully.
Repeat Trigger SelectorPut jumper as shown on the image.
arduino motion sensor initial setting

ESP8266 Code

/* * This ESP8266 NodeMCU code was developed by newbiely.com * * This ESP8266 NodeMCU code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/esp8266/esp8266-motion-sensor-led */ #define MOTION_SENSOR_PIN D7 // The ESP8266 pin D7 connected to the OUTPUT pin of motion sensor #define LED_PIN D1 // The ESP8266 pin D1 connected to LED's pin int motion_state = LOW; // current state of motion sensor's pin int prev_motion_state = LOW; // previous state of motion sensor's pin void setup() { Serial.begin(9600); // Initialize the Serial to communicate with the Serial Monitor. pinMode(MOTION_SENSOR_PIN, INPUT); // Configure the ESP8266 pin to the input mode pinMode(LED_PIN, OUTPUT); // Configure the ESP8266 pin to the output mode } void loop() { prev_motion_state = motion_state; // store old state motion_state = digitalRead(MOTION_SENSOR_PIN); // read new state if (prev_motion_state == LOW && motion_state == HIGH) { // pin state change: LOW -> HIGH Serial.println("Motion detected!, turns LED ON"); digitalWrite(LED_PIN, HIGH); // turn on } else if (prev_motion_state == HIGH && motion_state == LOW) { // pin state change: HIGH -> LOW Serial.println("Motion stopped!, turns LED OFF"); digitalWrite(LED_PIN, LOW); // turn off } }

Detailed Instructions

To get started with ESP8266 on Arduino IDE, follow these steps:

  • Check out the how to setup environment for ESP8266 on Arduino IDE tutorial if this is your first time using ESP8266.
  • Wire the components as shown in the diagram.
  • Connect the ESP8266 board to your computer using a USB cable.
  • Open Arduino IDE on your computer.
  • Choose the correct ESP8266 board, such as (e.g. NodeMCU 1.0 (ESP-12E Module)), and its respective COM port.
  • Connect your ESP8266 to your computer using a USB cable.
  • Open the Arduino IDE, select the appropriate board and port.
  • Copy the code above and open it in the Arduino IDE.
  • Click the Upload button in the Arduino IDE to compile and upload the code to the ESP8266.
Arduino IDE Upload Code
  • Move your hand in front of the sensor and Check out LED's state.

Code Explanation

Check out the line-by-line explanation contained in the comments of the source code!

Video Tutorial