DIY Calculator Using Arduino & Keypad | Perform Basic Math on LCD!

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DIY Calculator Using Arduino & Keypad | Perform Basic Math on LCD!

Welcome to RoboRequest – You Ask, We Build!
This time, we’re putting math at your fingertips with a DIY Calculator Project using Arduino Uno, 4x4 Keypad, and a 16x2 LCD Display with I2C module! 🧮✨
Perform addition, subtraction, multiplication, division, square roots, and even squaring — all on a compact hardware setup!

🔢 A smart mini calculator built from scratch, great for students, hobbyists, and anyone learning how to combine input devices with display logic.

💡 This is a perfect project for learning about keypad interfacing, LCD communication using I2C, basic expression parsing, and real-time input-output feedback using Arduino.

📍 What You’ll Learn in This Tutorial:
✅ How to connect a 4x4 Keypad to Arduino
✅ Interface a 16x2 LCD using I2C
✅ Capture and display expressions in real time
✅ Cycle through operators and functions using custom logic
✅ Parse basic math expressions and show the result

🧰 Components Used:
Arduino Uno
16x2 LCD with I2C module
4x4 Matrix Keypad
Jumper Wires
Breadboard (optional)
USB Cable

👉 Download Arduino IDE:


📁 Download Arduino Code (.ino):


📄 Download Code in Word Format (.docx):


🖼 Circuit Diagram Image:


🕹 Chapters (Timestamps):
0:00 – Intro
0:20 – Project Overview
0:45 – Required Components
1:10 – Wiring and Connections
1:40 – Code Walkthrough
4:30 – Live Demo of Calculator
5:10 – Tips & Final Thoughts

📌 Recommended For:
Arduino + Display Projects
Input-Output Interface Practice
Mini Calculator Builds
STEM + Classroom Demos
Beginner Embedded Learners

📢 Special Thanks to:
@KinetictechV1 for requesting this awesome project! 🙌

💬 Drop your RoboRequest in the comments — we might build your idea next!
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