Project 49 - Combo Logic Lock "K-12 JUNO STEM KIT"

Shreyash Shukla
Oct 27, 2025
2 min read

What You Can Build Using K-12 JUNO STEM KIT

The "Combo Logic Lock" project challenges learners to build a simple electronic lock using a reed switch and two slide switches connected in series. The LED only lights up when all switches—including the magnet-controlled reed switch—are ON, demonstrating real-world logic gate principles.

What You Can Learn

Series Logic Circuits: Discover how components in series create an “AND” logic gate, where every switch must be ON for the output (LED) to activate.
Magnetic Sensing: Explore how reed switches respond to magnets, adding an extra layer of control or security to your circuit.
System Interlocks: Understand how multiple condition checks improve safety, control, and problem-solving in devices.

Real Life Problem Solving

Access Control: See how logic lock systems are used in doors, safes, and machinery—only open or power on when all conditions are met.
Multi-step Security: Learn strategies for boosting security through combination keypads and multi-switch circuits.
Puzzle Design: Create your own challenge or escape room puzzles using these principles!

Applications and Extensions

Increase number or types of switches for more complex lock combinations.
Integrate other sensors (IR, LDR) for timed or environmental logic.
Combine with buzzers or displays for feedback when the lock is activated.

Skills Developed

Wiring and troubleshooting series logic circuits.
Applying practical logic gate principles to real-world problems.
Creative thinking in circuit design for security and entertainment.

Real-Life Benefits

Security Practice: Teaches core concepts behind safe and secure device operation.
Applied Logic: Enhances problem-solving skills with hands-on logic gate challenges.
Innovation: Inspires the creation of smarter, user-customized projects.

Why This Project Matters

The Combo Logic Lock project puts STEM learning into action, teaching both logic circuit theory and practical design for security.

Project 49: Combo Logic Lock encourages students to build, experiment, and innovate with the building blocks of modern access control and safe design!