Key Switch sensor Module For R3 Starters

The Key Switch Sensor Module is a simple input module designed for use with **Arduino UNO R3 starter kits and similar microcontroller systems. It acts like an electronic “key lock” switch that allows or blocks a signal depending on whether the key is inserted and turned.

This module is commonly used in beginner electronics kits (“R3 starter kits”) to teach basic digital input, security control logic, and switch-based circuits.

Features

• Mechanical key-based ON/OFF switch
• Digital signal output (HIGH/LOW)
• Easy plug-and-play interface for R3/UNO kits
• Durable rotary key mechanism
• Ideal for learning control logic and access systems

Specifications

• Operating Voltage: 3.3V – 5V DC
• Output Type: Digital (0 or 1)
• Interface: 3-pin (VCC, GND, Signal)
• Switch Type: Rotary key lock switch
• Compatible Boards: Arduino UNO R3, Nano, Mega, ESP32 (via digital input)

Pin Description

• VCC – Power supply (5V typical)
• GND – Ground
• S – Signal output to digital input pin

How it works

When the key is inserted and turned, the internal switch closes and sends a HIGH signal to the microcontroller. When the key is removed or turned off, the output becomes LOW, allowing the system to detect access or activation status.

Applications

• DIY security systems
• Access control projects
• Starter kit learning modules
• Electronic lock simulation
• Automation control triggers
• Arduino education projects