Arduino noise quickshifter

Using Arduino Project Guidance
#1

Dear

Hey I made myself a quickshifter (motorcycle ignition cut-out) with an Arduino. The problem is that I have noise on my input pin, it gets high by the noise of the running engine. (I used pull-down resistor for the switch) I read a post where someone explained that he used a capacitor to eliminate this. Can anyone tell me how I need to connect such a capacitor? Do I just need to put it across the switch?

Kind regards

Stan

#2

I wrote a post where someone explained that he used a capacitor to eliminate this.

You wrote that post? Or you read that post?

One leg of the capacitor goes to the digital pin. The other goes to ground.

#3

Yeah read indeed, sorry haha
and okay thank you, i will test it out soon.

#4

Do you happen to know which capacity of capacitor is good for this application?

#5

StanSegers:
Do you happen to know which capacity of capacitor is good for this application?

A typical bypass cap is in the 0.1uF range. Much will depend on the output impedance of whatever is driving the pin. If the output device has a very high impedance I'd work on a buffer for that in addition to filter caps...

Capacitors have a limited range of effectiveness; you might also consider having multiple caps; 0.1uF to help with lower-frequency noise and a 33pF for high-frequency noise.

#6