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Glad to hear that my common ground would work for the leds. But I can't see the logic in the buffer chip? Digital potentiometer makes sense [link]sparkfun.com/products/10613 and then pulse various resistances in relation to the resistance of the keypad?

Robert Cole
– Robert Cole

2016-03-08 12:15:38 +00:00
Commented Mar 8, 2016 at 12:15
The leds might be supplied with 12v. Connecting this to the Arduino will break if. So in that case you need to convert the 12v signals to 5v signals, using a buffer chip, or some discrete circuitry. The the voltage is around 5v, I would at least put a resistor between the led and the Arduino. PS depending on how the led is wired (resistor 'before' or 'after' led) you might have to connect your wire to the associated resistor. The pot. you linked is what I meant. But you have to measure the resistance of the keypad (while powered off) to see if the 10k version is okay.

Gerben
– Gerben

2016-03-08 14:21:14 +00:00
Commented Mar 8, 2016 at 14:21

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