Maker Pro
Maker Pro

keypad

i have this keypad design and it works fine. i need to know why there is the 1K resistors. any help?
 

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davenn

Moderator
they are either pull up or pull down resistors ( depending on if they are going to the +V rail or the 0V rail)
The chip that scans the keyboard keys will see wither +V or 0V till the key is press when the opposite polarity is read

Dave
 
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