modified 10 years ago

An example for a simple 1-9 number keypad

00:45:15

This version uses a common Vin, so you'd need 10 cables
Vin
D1
D2 
D3
D4
D5
D6
D7
D8
D9

For simplicity I wired the cathodes of the LEDs together, in reality you wouldn't have LEDs but simply the output cable.

I'm open for constructive comments, feel more than welcome to use this common design in your circuits! :)

published 10 years ago

Nazik100500

10 years ago

Good

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