IR Sensor with Buzzer

The EzloPi smart devices provide automation through simple, customizable use with our open-source EzloPi platform, making daily life easier and improving human-machine interactions.

Before moving into this example, it is very important to know about the device registration, provisioning and converting the ESP32 device into an EzloPi device along with knowledge of Web Flasher, MiOS Mobile Application for Android/iOS and the MiOS Web Application.

1. About this example

In this project, we will interface a buzzer with the FC-51 IR proximity sensor using the EzloPi device and trigger a buzzer alarm when it detects motion within the sensor’s range.

The FC-51 IR sensor is a commonly used electronic component in various DIY electronics projects, automation and robotics. It operates by emitting infrared light and measuring the reflection of this light to detect the presence or absence of objects in its proximity. This sensor is widely used for various applications such as obstacle detection, motion sensing, and proximity detection.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of IR Sensor with Buzzer, providing a visual walkthrough of its implementation.

Play Video

3. Circuit Setup & Interfacing

The following components are required for interfacing with the EzloPi device:

  • ESP32 as an EzloPi smart device.
  • FC-51 Infrared (IR) Proximity Sensor.
  • Buzzer.

The wiring diagram of ESP32 30 pin is represented as follows:

The following connections are made in order to complete the circuit setup.

From ESP32 to IR Proximity Sensor:

  • Connect 3V3 from the ESP32 to the VCC of the sensor.
  • Connect GND from the ESP32 to the GND pin of the sensor.
  • Connect D4 from the ESP32 to the OUT pin of the sensor.

From ESP32 to the Buzzer:

  • Connect the D5 pin from the ESP32 to the Signal pin of the buzzer.
  • Connect the GND to the negative pin of the buzzer.

4. Interfacing the IR Proximity Sensor with Buzzer using EzloPi Web Flasher

1. Set up your device/hardware by visiting

  1. Log in using the credentials which you just set earlier while signing up.
  1. Now, click on the Connect Device button and a pop-up window will appear.
  1. Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect.

  1. If you are new to this and it’s your first time configuring, select Create new Device ID. Enter Wifi SSID and Wifi Password.
  2. In the Device Configuration, tab click on Digital Output..
  1. A Digital Output window will open for inputting the following parameters:
  • Set a device name of your choosing. In our case, we set it to Motion with Buzzer.
  • Set Device subtype to LED.
  • Set OUT GPIO to 5.
  • Set Resistor to PULL UP.
  • Set the default value to LOW.
  • Check the Button Enable box.
  • Set INP GPIO to 4.
  • Set Resistor to PULL DOWN.
  • Set the default value to LOW.
  • Now Click the Apply button.
  • After clicking the apply button you can see a table of your setting in the device configuration tab.
  • Press the Flash Device button.
  1. A window will appear on the bottom right side of the screen displaying “Please press BOOT button while flashing begins.”
  1. Hold the BOOT button down until the next window appears on the bottom right side of the screen which says “Installation prepared. Please release the boot button now.”
  1. Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.
  1. After some time, a popup will appear saying Device Flashed Successfully! This means that your device has been set up successfully.

5. MiOS App

You can download the MIOS Android app from the Google Play Store and Apple App Store.

Google PlayApple App Store
  1. After downloading the app, proceed to install the application and open it.
Sensor App
  1. Using the MIOS mobile application, create a new Ezlo Cloud account using the sign-up option. If you already have an account, you may proceed to log in.
MiOS App
  1. After successfully logging in, you will be able to see the number of controllers connected such as a lamp, fan, or any other device in the MiOS app. Tap on any controller of your desired ID:
  1. You will be able to see the status of your controller whether it is online or offline. Access the device dashboard, and tap the device. The following view of the dashboard will appear:
  1. After opening the MiOS mobile dashboard, you will be able to see the tile of your connected device. The IR proximity sensor works as a no-touch alarm, the buzzer will be triggered when it detects motion.
Motion with buzzer
  1. Similarly, when the motion is detected again by the sensor, the buzzer will stop.

6. MiOS Web Application

  1. After configuring the controller with the EzloPi web flasher, head to
Login to MiOS
  1. Use the same credentials to log in that you used for configuring the controller with the web flasher.
  1. After opening the web dashboard, you will be able to see the tile of your connected device. The IR proximity sensor works as a no-touch alarm, the buzzer will start sounding if it detects motion.
  1. Similarly, when the motion is detected again by the sensor, the buzzer will stop.
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