How to Cure Switch Bounce to Reading the Key

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SUMMARY

This discussion focuses on effective methods to cure switch bounce in electronic circuits. Two primary approaches are highlighted: using analog components such as capacitors and resistors, and implementing software solutions that involve reading the input multiple times. Additionally, the use of cross-coupled NAND gates is recommended for debouncing switches with multiple throws per pole. These techniques ensure reliable key reading in various applications.

PREREQUISITES
  • Understanding of switch bounce and its effects on electronic circuits
  • Familiarity with analog components like capacitors and resistors
  • Basic knowledge of software input reading techniques
  • Experience with digital logic components, specifically NAND gates
NEXT STEPS
  • Research analog debounce circuits using capacitors and resistors
  • Explore software debounce techniques in programming environments
  • Learn about cross-coupled NAND gate configurations for switch debouncing
  • Investigate the impact of switch bounce on microcontroller input readings
USEFUL FOR

Electronics engineers, hobbyists working with switches, and developers designing user interfaces that require reliable key input.

jyothika
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how to cure Switch Bounce? is it a good idea to read the key more than once?
 
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You can do it analogly with a cap and a resistor or you can do it in software by reading the input a few times - it depends on the application.
 
You can also use cross-coupled NAND gates to debounce a switch, if the switch has two throws per pole.
 

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