Safe Combination Lock Simulator with Arduino Uno & Servo — Enter the Secret 3-Digit Combo to Unlock

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine a safe that unlocks only when you dial in the perfect three numbers. This kit brings that idea to life: you’ll wire three potentiometers as secret dials, program an Arduino Uno to check a stored combination, and watch a servo motor swing a lock mechanism when the code is right. A buzzer shrieks on any wrong attempt, mimicking a real alarm. It’s the simplest way to understand how digital locks and access control systems work — without needing any prior electronics experience.

What You'll Build

You’ll assemble a fully functional combination lock simulator on a breadboard. Turn the knobs; when all three potentiometers match the hidden code, the servo rotates 90 degrees to release a latch (you can even build a cardboard door around it). The active buzzer sounds on error, making it feel like a real security device. Once you’re done, you’ll have a programmable mini safe lock that responds instantly to the code you set.

What You'll Learn

• Reading analog sensor values from potentiometers and mapping them to digits
• Writing conditional logic in Arduino C++ to compare inputs with a stored password
• Controlling a servo motor precisely using the Servo library
• Integrating a buzzer for real-time feedback in an alarm system

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Young electronics hobbyists aged 10 and above, ATL Tinkering Lab participants, and CBSE Class 11-12 students taking their first steps in embedded systems will love this project. Parents looking for a safe, hands-on STEM activity that involves real coding and mechanics will find it a perfect weekend build. Even hobby club mentors can use it as a go‑to security electronics demo.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.