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1  Using Arduino / Project Guidance / Using ADC with barebones Arduino on: November 13, 2012, 03:17:07 am
I am working on building a few bare-bones arduinos a la:

I have come across this statement in the tutorials I've checked out:

"Pin 20 needs to be connected to power if ADC isn't being used, and if it is, it needs to be connected to power via a low-pass filter. (A low-pass filter is a circuit that lessens noise from the power source)."

Can someone please point me towards the necessary information to add such a low-pass filter to my circuit?

Also, if I'm just interested in using I2C, which uses analog pins 4 and 5, do I need the low-pass? Is I2C using the ADC?

My potential applications of I2C include:
Adafruit's I2C backpack:
Reading an accelerometer:

Thanks very much for any help you can offer!

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