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Kit purchase

Looking for parts? Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

Name	Includes ESP32 board	PURCHASE LINK
ESP32 Ultimate Starter Kit	ESP32 WROOM 32E +	BUY
Universal Maker Sensor Kit		BUY

Course Introduction

This program uses an ESP32 board with an infrared obstacle avoidance sensor and a water pump.

The sensor is used to detect the presence of an object.

When an object is detected, the water pump is activated to dispense liquid (liquid hand soap).

Note

If this is your first time working with an ESP32 project, we recommend downloading and reviewing the basic materials first.

Required Components

In this project, we need the following components:

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE LINK
1	ESP-WROOM-32 ESP32 ESP-32S Development Board	1	BUY
2	USB Type-C cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	Power Supply	1	BUY
6	IR Obstacle Avoidance Sensor Module	1	BUY
7	L9110 Motor Driver Module	1
8	Centrifugal Pump	1

Wiring

Common Connections:

L9110 Motor Driver Module
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
- A-1A: Connect to GPIO25 on the ESP32.
- A-1B: Connect to GPIO26 on the ESP32.
IR Obstacle Avoidance Sensor Module
- OUT: Connect to GPIO23 on the ESP32.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
Centrifugal Pump
- Connect to L9110 Motor Driver Module MOTOR A.
- Connect to L9110 Motor Driver Module MOTOR A.

Writing the Code

Note

You can copy this code into Arduino IDE.
Don’t forget to select the board(ESP32 Dev module) and the correct port before clicking the Upload button.

// ESP32 version: IR obstacle sensor + DC pump

// ---- Pins (ESP32 safe GPIOs) ----
const int SENSOR_PIN = 23;  // IR sensor DO (active-LOW typical)
const int PUMP_INA   = 25;  // Pump driver input A
const int PUMP_INB   = 26;  // Pump driver input B (kept LOW for one direction)

// ---- Timings ----
const unsigned long PUMP_ON_MS = 700;   // pump ON duration
const unsigned long REST_MS    = 1000;  // cooldown between shots

void setup() {
  pinMode(SENSOR_PIN, INPUT);  // if your module needs pull-up, use INPUT_PULLUP
  pinMode(PUMP_INA, OUTPUT);
  pinMode(PUMP_INB, OUTPUT);

  // Ensure pump is off
  digitalWrite(PUMP_INA, LOW);
  digitalWrite(PUMP_INB, LOW);

  Serial.begin(115200);
}

void loop() {
  int sensorValue = digitalRead(SENSOR_PIN);  // LOW = obstacle (typical)
  Serial.println(sensorValue);

  if (sensorValue == LOW) {          // detected
    digitalWrite(PUMP_INB, LOW);     // one direction only
    digitalWrite(PUMP_INA, HIGH);    // pump ON
    delay(PUMP_ON_MS);
    digitalWrite(PUMP_INA, LOW);     // pump OFF
    delay(REST_MS);                  // avoid rapid retrigger
  }
}