ESP32 - Control Pump

In this tutorial, we are going to learn how to control a pump using ESP32. Based on this tutorial, you can make the irrigation system, aquarium, water refilling system ...

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×12V Pump
1×Vinyl Tube
1×12V Power Adapter
n×Jumper Wires
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About 12V Pump


ESP32 Pump Pinout

12V Pump usually has two pins:

  • Negative (-) pin (black) needs to be connected to GND of DC power supply
  • Positive (+) pin (red) needs to be connected to 12V of DC power supply

How to Control Pump

If 12V pump is powered by 12V power supply, it works. To control a pump, we need to use a relay in between ESP32 and pump. ESP32 can control the pump via the relay. If you do not have knowledge of relay (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about relay in the ESP32 - Relay tutorial

Wiring Diagram

ESP32 Pump Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

ESP32 Code

The below code repeatedly turns the pump ON in five seconds and OFF in five seconds,

/* * Created by * * This example code is in the public domain * * Tutorial page: */ // constants won't change const int RELAY_PIN = 27; // ESP32 pin GIOP27, which connects to the IN pin of relay // the setup function runs once when you press reset or power the board void setup() { // initialize digital pin A5 as an output. pinMode(RELAY_PIN, OUTPUT); } // the loop function runs over and over again forever void loop() { digitalWrite(RELAY_PIN, HIGH); // turn on pump 5 seconds delay(5000); digitalWrite(RELAY_PIN, LOW); // turn off pump 5 seconds delay(5000); }

Quick Steps

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE, select the right ESP32 board and COM port
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • See the pump's state

Code Explanation

Read the line-by-line explanation in comment lines of code!

Video Tutorial

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Challenge Yourself

  • Make an automatic irrigation system using ESP32, soil moisture sensor, and pump
  • Make an automatic water refilling system using ESP32, water level sensor, and pump


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