ESP32 - Control Pump

This tutorial instructs you how to use ESP32 to control a pump. You can extend this tutorial to build the DIY aquarium, cocktail machine, coffee machine, or irrigation system...

Hardware Used In This Tutorial

1	×	ESP-WROOM-32 Dev Module
1	×	Micro USB Cable
1	×	Relay
1	×	12V Pump
1	×	Vinyl Tube
1	×	12V Power Adapter
1	×	Jumper Wires
1	×	(Optional) 5V Power Adapter
1	×	(Optional) DC Power Jack
1	×	(Optional) ESP32 Screw Terminal Adapter

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Introduction to 12V Pump

Pump Pinout

A 12V Pump has two wires:

Negative (-) wire (black): connect this wire to the negative wire of 12V DC power supply
Positive (+) wire (red): connect this wire to the Positive wire of 12V DC power supply

How to Control Pump using ESP32

If we connect a 12V power supply to a pump, the pump will work. We can programmatically control a pump by using ESP32. To do so, we need a relay in between the pump ESP32 board. We have a specific tutorial about relay, which contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn about relay in the ESP32 - Relay tutorial

Wiring Diagram between ESP32, Relay and Pump

This image is created using Fritzing. Click to enlarge image

ESP32 - Pump Code

The below code periodically turns the pump ON/OFF in every 4 seconds.

/* * This ESP32 code is created by esp32io.com * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-controls-pump */ #define 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 GIOP27 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 4 seconds delay(4000); digitalWrite(RELAY_PIN, LOW); // turn off pump 4 seconds delay(4000); }

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
See the pump's state

Line-by-line Code Explanation

The above ESP32 code contains line-by-line explanation. Please read the comments in the code!

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