![]() ![]() ![]() Int newSlope //storage for incoming slope data Int maxSlope = 0 //used to calculate max slope as trigger point Unsigned int period //storage for period of waveįloat frequency //storage for frequency calculations Unsigned int totalTimer //used to calculate period Unsigned int time = 0 //keeps time and sends vales to store in timer occasionally The only thing I have changed from her code is I removed the clipping indicator LED and instead printed "clipping" in the serial monitor whenever the signal clips. Try running this modified version of Amanda's code for Arduino Frequency Detection to test out the Arduino's frequency calculation. Play every string and check on the oscilloscope to make sure your signal is centered around 2.5V and that the signal is close to but does not exceed 5V peak to peak. Turn the volume on your guitar all the way up and plug your guitar into the audio jack. Attach your scope probe to the output of the DC offset (where the circuit is attached to A0 on the Arduino). Connect the black wire of the jack to ground. Your audio input should be the green wire of the audio jack. I recommend building this circuit on a breadboard and testing it out using an oscilloscope before soldering it together. Above is a schematic of the circuit you will need to do this. It should also have the greatest amplitude possible without clipping in order to get more accurate frequency calculations. The signal needs to be between 0 and 5V in order for it to be read by the Arduino's analog pin. The audio signal coming from the electric guitar needs to be amplified to be about 5V peak to peak and and offset to be centered around 2.5V as opposed to 0V. ![]()
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