ESP32 - Motion Sensor - Piezo Buzzer
This tutorial instructs you how to use ESP32 with HC-SR501 motion sensor and Piezo Buzzer. In detail:
- ESP32 automatically makes sound if the motion is detected, and stops making sound if otherwise
- ESP32 automatically makes a melody of song if the motion is detected, and stops making sound if otherwise
Hardware Used In This Tutorial
1 | × | ESP-WROOM-32 Dev Module | |
1 | × | USB Cable Type-C | |
1 | × | HC-SR501 Motion Sensor | |
1 | × | Piezo Buzzer | |
1 | × | Breadboard | |
1 | × | Jumper Wires | |
1 | × | (Optional) DC Power Jack | |
1 | × | (Recommended) Screw Terminal Expansion Board for ESP32 |
Or you can buy the following sensor kits:
1 | × | DIYables Sensor Kit (30 sensors/displays) | |
1 | × | DIYables Sensor Kit (18 sensors/displays) |
Introduction to Piezo Buzzer and Motion Sensor
We have specific tutorials about piezo buzzer and motion sensor. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:
Please note that this tutorial use 3-5V buzzer, but you can adapt it for 12v buzzer. you can learn about ESP32 - Buzzer tutorial
Wiring Diagram
The wiring diagram with power supply from USB cable
This image is created using Fritzing. Click to enlarge image
The wiring diagram with power supply from 5v adapter
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
Initial Setting
Detection Range Adjuster | Fully screw it in the clockwise direction. |
Time Delay Adjuster | Fully screw it in the anti-clockwise direction. |
Repeat Trigger Selector | Put jumper like the below image. |
ESP32 Code - Simple Sound
Quick Instructions
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Move your hand in front of sensor
- Listen to piezo buzzer's sound
Line-by-line Code Explanation
The above ESP32 code contains line-by-line explanation. Please read the comments in the code!
ESP32 Code - Melody
Quick Instructions
- Copy the above code and paste it to Arduino IDE.
- Create the pitches.h file On Arduino IDE by:
- Either click on the button just below the serial monitor icon and choose New Tab, or use Ctrl+Shift+N keys.
- Give file's name pitches.h and click OK button
- Copy the below code and paste it to the created pitches.h file.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Move your hand in front of sensor
- Listen to piezo buzzer's melody
Line-by-line Code Explanation
The above ESP32 code contains line-by-line explanation. Please read the comments in the code!
Video Tutorial
Making video is a time-consuming work. If the video tutorial is necessary for your learning, please let us know by subscribing to our YouTube channel , If the demand for video is high, we will make the video tutorial.