Project Hub /Robotics & Autonomous Systems/Motor Drivers & Motion Control/Efficient Speed Control Of DC Geared Motor With Display Facility For Robotics Application

Efficient Speed Control Of DC Geared Motor With Display Facility For Robotics Application

Intermediate

ARDUINO

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Efficient Speed Control Of DC Geared Motor With Display Facility For Robotics Application

A DIY project utilizing an Arduino Nano and L298 motor driver to efficiently control the speed of a DC geared motor via a potentiometer while displaying the speed on a 7-segment display.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino Nano C Type V3 ATMEGA328 with Soldered Headers Rs. 608.00
L298N Dual H-Bridge Motor Driver Module – 2A Rs. 195.00
3–6V R140 DC Motor (High-Speed DIY & Toy Motor) Rs. 49.00
110 RPM Single Shaft BO Motor – Straight Rs. 99.00
1200mAh 18650 Li-ion Bat – Reliable 3.7V Power Cell Rs. 129.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Potentiometer / Trimpot
7-Segment Display
AA / AAA Battery + Holder

Browse all components

How It Works

This project regulates the speed of a DC geared motor using an Arduino Nano as the central processing unit, powered by two 18650 Li-ion cells housed in a battery holder. The user adjusts a 10K potentiometer, which acts as a voltage divider, sending an analog signal to one of the Arduino Nano's analog input pins. The Arduino reads this voltage level and translates it into a corresponding Pulse Width Modulation (PWM) signal. This PWM signal is sent to the L298N Motor Driver Module, which regulates the amount of electrical power delivered to the 100 RPM BO motor with a gearbox and wheels, effectively controlling its rotational speed. Simultaneously, the Arduino processes the speed data and outputs the current speed status to a common cathode 7-segment display wired on a breadboard using jumper wires. The entire circuit is prototyped neatly on a breadboard, allowing for easy connection between the Arduino Nano, L298N driver, potentiometer, display, and power source.

Why Build This

Gain practical experience in building mobile robotic platforms that require variable speed control.

Learn how to integrate microcontrollers, motor drivers, and human-input devices like potentiometers into a single functioning mechatronic system.

Understand how to visually output system parameters, such as motor speed, using a basic 7-segment display.

Real-World Application

Controlling robotic vehicles, paper mills, elevators, and various mechatronics systems requiring precise motor speed regulation.

Skills You'll Learn

PWM signal generation

analog-to-digital conversion

DC motor speed control

motor driver interfacing

7-segment display multiplexing or driving

voltage divider utilization

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ARDUINO

DC MOTOR

L298 MOTOR DRIVER

PWM

7-SEGMENT DISPLAY

POTENTIOMETER

ROBOTICS

Frequently Asked Questions

Can I power the Arduino Nano and the motor using the same battery setup?

Yes, the two 18650 Li-ion cells can supply power to both the Arduino Nano and the L298N motor driver module, provided the common ground is properly connected.

Why is an L298N motor driver module necessary between the Arduino and the motor?

The Arduino Nano digital pins cannot supply enough current to drive a DC motor directly. The L298N driver handles the heavy current load required by the motor while taking safe control signals from the Arduino.

How does the potentiometer change the motor speed?

Turning the potentiometer changes the variable resistance, altering the analog voltage read by the Arduino. The Arduino code maps this voltage change to a varying PWM duty cycle sent to the motor driver.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00933