ESP8266 - Motion Sensor - LED
This tutorial instructs you how to use ESP8266 and motion sensor to control LED. In detail:
- ESP8266 turns on the LED when the movement of human or animal is detected
- ESP8266 turns off the LED when the movement of human or animal is not sensed
This can be applied in an automation process that triggers actions upon detecting human presence.
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables.
Additionally, some of these links are for products from our own brand, DIYables.
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
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 Adjuster | Screw it in anti-clockwise direction fully. |
| Detection Range Adjuster | Screw it in clockwise direction fully. |
| Repeat Trigger Selector | Put jumper as shown on the image. |
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.
- 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!