Debounce Button

Summary

Button debouncing(Suppress On/Off noise)

Description

Use this component to suppress electrical noise (Debounce) that occurs when a button or switch is pressed or released. Mechanical buttons and switches don’t make clean contact instantly — when the metal contacts touch, they physically bounce a few times, like small balls hitting each other. This causes multiple quick on/off pulses instead of a single clean signal.

The Debounce Button component filters out this noise so that only one clean signal is detected per press or release.

This is especially important when you use buttons or sensors as triggers for components such as:

Flip-Flops, Counters, Frequency meters, etc

Any circuit that reacts to short pulses or changes in state

If the bouncing isn’t removed, these components might register multiple unwanted triggers.

Some opto sensors can also exhibit similar noise — for example, when the light beam begins to dim or flicker. In these cases, the Debounce Button can also be used to stabilize the signal.

Important Rule: The Debounce component should almost never be used unless absolutely needed. Use it only when:

A mechanical button (or similar bouncing signal) is connected to a digital input pin, and

That signal is used as a trigger (for Flip-Flops, Counters, etc.).

Do not use it for signals that remain solidly ON or OFF, or for stable digital signals that don’t bounce.

This component ensures reliable triggering without multiple unwanted counts or activations.

Resources:

Instructable: Arduino Nano: Debouncing\, and Toggle button with Visuino

Instructable: Arduino Nano: Connecting Photo Interrupter (Slotted Optocoupler) With Visuino

Arduino and Visuino: Use PCF8574/PCF8574A I2C GPIO to Add More Digital Channels to Arduino

Instructable: Arduino Nano and Visuino: Save Rotary Encoder Value in EEPROM

Diagram: