Solar charged battery powered light monitoring using LDR sensor

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

This project aims to develop a robust and efficient light monitoring system using an LDR sensor for light monitoring. This smart monitoring system utilizes solar energy for charging the battery, which also powers the system during periods of low light availability or when solar energy is not available. The system incorporates an LDR (Light Dependent Resistor) analog sensor to detect ambient light levels and adjust its operation accordingly. This integration enables applications such as automated lighting control, energy efficiency optimization, or security systems based on environmental light conditions. Solar panel is also integrated in this project for EzloPi device to work independently without the aid of any external power supply.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Solar charged battery powered light monitoring using LDR sensor, providing a visual walkthrough of its implementation.

3. Circuit Setup & Interfacing

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

  • ESP32 as an EzloPi smart device.
  • LM393 Photoresistor module.
  • Solar Panel ZW110X69
  • Solar panel Controller HW-150
  • 18650 battery

The wiring diagram is represented as follows:

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

From ESP32 to LDR module:


From Solar panel to Solar controller:

Solar PanelSolar Controller
Signal +S+
Signal -S-

From 18650 Battery to Solar controller:

18650 BatterySolar Controller

From ESP32 to Solar controller:

ESP32Solar Controller

4. Interfacing the LDR sensor module 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 Analog Input.
  1. An Analog Input window will open for inputting the following parameters:
  • Set a Device name of your choosing. In our case, we set it to LDR.
  • Set Device subtype to LDR Sensor (Analog).
  • Set OUT GPIO to 33.
  • Set Resolution to 10-bit.
  • Then Click 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.
  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.
  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 mobile dashboard, you will be able to see the tile of your connected device. The LDR module is currently showing that at the time no amount of light is incident on the sensor so it is showing as ‘0’ value.
  2. When light is incident on the sensor, it will show analog value proportional to the incident light.

6. MiOS Web Dashboard

  1. After configuring the controller with the EzloPi web flasher, head to
  1. Use the same credentials to log in that you used for configuring the controller with the web flasher.
  1. After opening the MiOS web dashboard, you will be able to see the tile of your connected device. The LDR module is currently showing that at the time no amount of light is incident on the sensor so it is showing as ‘0’ value.
  1. Similarly, when more light is incident on the sensor, LDR’s value will increase.
Buy Components

eZlopie Products A single-channel 5V relay module $00.00

eZlopie Products Momentary switch $00.00

eZlopie Products Level Shifter Module (BSS138) $00.00

eZlopie Products ESP32

eZlopie Products AC Lamp and Holder