[Arduino Circuit Question] Using a Capacitor to Smooth Out the Messy Noise or Unstable Signal

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To whom it may concern,

Hello. I have a question about how to smooth out the noise/messy signal using a capacitor when it comes to controlling a joystick with an Arduino.

The link is pasted down below to view a photo. There are three photos within a link; Arduino/joystick diagram, photo, and signal wave.

LINK : https://imgur.com/a/dARk6hX

As you can know, the signal is not always constant as shown in one of the photos. The signal is received by a pin A4 (Analog Pin) on Arduino Mega.

My goal here is to get rid of the unstable-messy signal wave and to smooth it out using a capacitor.

Does anyone have any ideas on how to wire a capacitor to smooth out the messy signal? And also, what type of capacitor should I use?

If someone could paste the diagram on how to wire a capacitor and also show an electrical calculation with a detailed explanation, that would be very helpful.

Best Regards,

Alex

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Please post details in line. Many forum members don’t like to go off site to see your data.

The usual approach is to electrically smooth noisy input to the ADC is to connect a 0.1uF (100 nF) ceramic disk capacitor between the analog input and Arduino GND.

The “electrical calculation” requires details like the voltages and resistances of the input side of your Arduino setup. Look up “RC low pass filter” for on line discussion.