Speed Dial

Note

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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 Arduino board	PURCHASE LINK
Elite Explorer Kit	Arduino Uno R4 WiFi	BUY
3 in 1 Ultimate Starter Kit	Arduino Uno R4 Minima	BUY

Course Introduction

In this lesson, you’ll use a potentiometer and a DC motor with the Arduino R4 UNO to create a simple motor speed control system.

By rotating the potentiometer, you can adjust the motor speed from stop to full speed. The Arduino 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 Arduino 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	Arduino UNO R4 Minima/Arduino UNO R4 WIFI	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 A0 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
TA6586 - Motor Driver Chip
- BI: Connect to 10 on the Arduino.
- FI: Connect to 9 on the Arduino.
- 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(Arduino UNO R3) and the correct port before clicking the Upload button.

const int potPin = A0;     // Potentiometer signal pin
const int motorPin1 = 9;   // Motor IN1 pin (PWM)
const int motorPin2 = 10;  // Motor IN2 pin (LOW for direction control)

void setup() {
  pinMode(motorPin1, OUTPUT);  // Set motorPin1 as output
  pinMode(motorPin2, OUTPUT);  // Set motorPin2 as output
}

void loop() {
  int val = analogRead(potPin);           // Read analog value from potentiometer (0–1023)
  int speed = map(val, 0, 1023, 0, 255);  // Map value to PWM range (0–255)

  analogWrite(motorPin1, speed);  // Drive motor with mapped speed (one direction)
  analogWrite(motorPin2, 0);      // Keep the other pin LOW to set rotation direction
}