ESP32 Water Meter Project

Creating a water meter using an ESP32 microcontroller can be a useful project for monitoring water consumption. Below is a basic outline of the steps you might take to build an ESP32-based water meter. Keep in mind that the specifics of your project may vary based on the type of water meter, sensor, and additional features you want to incorporate.

Related: FireBeetle ESP32 IoT Microcontroller

Components Needed:

  1. ESP32 Microcontroller: This will be the brain of your project.
  2. Water Flow Sensor: Choose a flow sensor suitable for your application. It typically consists of a rotor that spins as water flows through it, generating pulses.
  3. Power Supply: Ensure you have a stable power supply for the ESP32 and other components.
  4. Display (optional): If you want to display real-time or historical data, consider adding an OLED display or connecting to a web server for remote monitoring.
  5. Enclosure: Protect your electronics from the environment by using a suitable enclosure.


1. Connect the Hardware:

  • Connect the water flow sensor to the GPIO pins on the ESP32.
  • Power the ESP32 and the sensor appropriately.

2. Write the Firmware:

  • Use the Arduino IDE or PlatformIO with the ESP32 board support to write the firmware.
  • Utilize the ESP32’s GPIO interrupts to count the pulses generated by the water flow sensor.
  • Implement a calibration process to convert the pulse count to actual water flow or volume.

3. Set up Wi-Fi:

  • If you want to enable remote monitoring, connect the ESP32 to your Wi-Fi network.
  • Consider using MQTT or HTTP to send data to a server for storage and visualization.

4. Data Logging and Storage:

  • Implement code to log water consumption data. You can store data locally or send it to a cloud server.
  • Consider using SPIFFS (SPI Flash File System) for local storage on the ESP32.

5. Display (Optional):

  • If you have a display, update it with real-time or historical water consumption data.
  • For remote monitoring, create a web interface or use a platform like ThingSpeak.

6. Power Management:

  • Implement power-saving measures to ensure efficient use of the battery, if applicable.

7. Testing:

  • Test your setup with different water flow rates to ensure accurate readings.
  • Monitor power consumption and battery life.

8. Enclosure and Weatherproofing:

  • Place the components inside a suitable enclosure.
  • Ensure the setup is protected against environmental conditions.

9. Documentation:

  • Document your project, including the circuit diagram, code, and any calibration procedures.
  • Consider creating a user manual if the device will be used by others.

Remember to refer to the datasheets of your specific components for accurate wiring and usage instructions. Additionally, you may find existing libraries for water flow sensors that simplify the development process.