Push Button in IoT: Working, Applications & Wiring Explained [2025 SEO Guide]

What is a Push Button?

A Push Button is a simple mechanical switch that allows users to temporarily make or break an electrical connection. It is widely used in electronics and embedded systems to control inputs and initiate functions like power, reset, or triggering events.

When the button is pressed, it completes the circuit; once released, the connection breaks, making it a momentary switch.

How Does a Push Button Work?

A push button operates using a spring-loaded mechanism. Internally, it has a metal contact that bridges the connection between two terminals when pressed. As soon as the pressure is released, the spring forces the contacts apart, thus breaking the circuit.

This makes it ideal for real-time interaction in circuits where human input is needed — like turning on lights, controlling relays, or giving signals to microcontrollers.

Applications of Push Button

Push Buttons are commonly used in:

• Home appliances (e.g., microwave, washing machine)
• Elevators and intercom systems
• Industrial control panels
• Arduino or Raspberry Pi projects
• Smart devices and automation systems
• Emergency stop mechanisms in machinery

They are essential in systems where manual control or user input is required.

Features and Benefits

• Simple Design – Easy to integrate in any circuit

• Low Cost – Economical for mass production

• Compact Size – Fits into small enclosures

• Highly Reliable – Long-lasting with minimal failure

• Mechanical Feedback – Tactile feel confirms press

• Ideal for Digital Inputs – Perfect for logic-level devices like microcontrollers

Types of Push Buttons

1. Momentary Push Button (Normally Open/NO or Normally Closed/NC)

• NO (Normally Open) – Circuit is open until button is pressed

• NC (Normally Closed) – Circuit is closed until button is pressed

2. Latching Push Button

• Press once to turn ON, press again to turn OFF (like a toggle switch)

3. Illuminated Push Button

• Has a built-in LED light to show status
• Useful in low-light environments and status indication

4. Mushroom Head Push Button

• Large button head for emergency stops
• Common in industrial machinery

5. Double Pole Push Button

• Can control two separate circuits at the same time

Internal Structure of a Push Button (Simplified)