I had a project working seamlessly on an arduino and am in the process of moving it from bread board and arduino to just a bread board. I have exchanged the 16mhz crystal for a ceramic oscillator and everything seems to work fine however the analog to digital convert seems to be quite jumpy and sometimes spikes. Does the ADC on an arduino have a low pass filter on it? If so, how do I build one on a bread board? (my ultimate goal is a custom PCB).
I use a series 10uH inductor and a 0.1uF capacitor per the Atmel recommendation.
If you need a schematic checkout the datasheet link at Loading...
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Does the ADC on an arduino have a low pass filter on it?
No.
how do I build one on a bread board
I use a 100R series resistor and 0.1uF to ground but it depends on how quickly the input voltage is going to change.
For a discussion of a simple RC filter see the end of;-
http://www.thebox.myzen.co.uk/Tutorial/PWM.html