heyyo so i'm trying to simply connect my arduino to my guitar so i can read the signals and do stuff with it but with trying to connect my pickup to the arduino and looking at the graph, the signal seems to be "noisy" to me or "fuzzy", even when i'm not playing anything. anyone know why this is?
if i play stuff too there's not much (like none whatsoever) of a difference in how it looks on the graph and i have no idea what to do..
My circuit consists of a 22pf capacitor to amplify the signal...
Here is an audio-input circuit (two equal-value resistors and a capacitor). For a guitar you'll want higher impedance so change the two resistors to 1 or 2 Meghoms and you can change the 10uF capacitor to about 0.1uF. You can skip the 47pF cap, and the other components shown represent the source (which in your case is the guitar) and are not part of the Arduino circuit. The two equal-value resistors bias the input at 2.5V, which will read about 512 on the Arduino's ADC. The AC guitar signal will be added to that, so the positive half of the waveform will go above 512 and the negative-half will go below 512. (You can subtract-out the bias in software if you wish.) The 10uF capacitor (or lower with higher-value resistors) isolates the 2.5VDC from the guitar and it prevents the impedance of the guitar from messing-up the 2.5V bias.