Speed Dial

Note

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

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

In this lesson, you’ll use a potentiometer and a DC motor with the ESP32 to create a simple motor speed control system.

By rotating the potentiometer, you can adjust the motor speed from stop to full speed. The ESP32 reads the potentiometer value, maps it to PWM output, and drives the motor in one direction with variable speed.

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 Cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	TA6586 - Motor Driver Chip	1
6	Potentiometer Sensor Module	1	BUY
7	TT Motor	1
8	Power Supply	1	BUY

Wiring

Common Connections:

Potentiometer Sensor Module
- OUT: Connect to GPIO34 on the ESP32.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
TA6586 - Motor Driver Chip
- BI: Connect to GPIO19 on the ESP32.
- FI: Connect to GPIO18 on the ESP32.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
TT Motor
- Connect to B0, F0 on the TA6586 - Motor Driver Chip.

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.

// Potentiometer and motor control for ESP32 using analogWrite()

const int potPin    = 34;  // Potentiometer signal pin (ESP32 ADC input)
const int motorPin1 = 18;  // Motor PWM pin
const int motorPin2 = 19;  // Motor direction pin

void setup() {
  // Motor pins as output
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);

  // Potentiometer pin as input
  pinMode(potPin, INPUT);

  // Set initial motor state
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
}

void loop() {
  // Read analog value from potentiometer (0–4095 on ESP32)
  int val = analogRead(potPin);

  // Map value to PWM range (0–255)
  int speed = map(val, 0, 4095, 0, 255);

  // Set direction (LOW = one direction)
  digitalWrite(motorPin2, LOW);

  // Drive motor with mapped speed
  analogWrite(motorPin1, speed);

  delay(10);  // Small delay for stability
}