# What is Debouncing?
It can be challenging to connect buttons or switches to microcontroller inputs
- the electric signal can bounce - looks like you pressed it several times quickly
- electrical contacts make & break contact multiple times “contact bounce” ⇒ leads to rapidly changing signals - can cause problems
- input voltage toggles a few times: HIGH ⇒ LOW ⇒ HIGH ⇒ …
With Debouncing chattering (unwanted signals) gets eliminated
- So the system recognizes a single press - not many
- It ensures a stable & safe input
# Example of chattering
for input signals on/off
Debounce can be done in hardware or software
There exists many debouncing methods
# Hardware Debouncing
- Bounce-Free Switches
- special & expensive
- Debouncing ICs (Integrated Circuits)
# Schmitt Trigger
Is like a traffic light for electrical signal
- changes state through “stop” & “go”
- it’s like a decision maker that waits for a clear choice before changing its mind
RC filter followed by a Schmitt Trigger:
# Cross-coupled NAND debounce
# Software Debouncing
Delay at reading inputs
there also exists a counter btw but nvm how to use it haha