Pedvide, this works fantastic! I numbers I get from my log scale light sensor are much more stable. Your library is certainly advanced but the more I read, I realized it is incredibly well documented! Thank you!
I found this image helpful for those trying to figure out which pins are on ADC0, ADC1, or both!
I have a jumper to cut and solder to change my mic pin, but this edit gets my two earlier prototypes running with ADC+Audio libraries!
Also, I went ahead and cleaned up the example code below. It's based on PRJC's FFT example but configured for taking audio from a mic without the Audio Board and taking an analog reading from ADC1 which currently isn't used by InputAudioAnalog. New Users: currently AnalogReference(INTERNAL) is currently hard coded into the library, depending on you wiring/mic you may need to edit the library. See: https://github.com/PaulStoffregen/Audio/issues/89
Important note from Paul on the topic:
Code:
// FFT Test for Analog Mic
//
// Use PRJC's Audio library to compute audio spectrum analysis
// from an analog mic input on ADC0 while taking an analog read
// sample from a pin on ADC1 using Pedvide's ADC library.
// Download the latest copy at:
// https://github.com/pedvide/ADC
//
// Compute a 1024 point Fast Fourier Transform (spectrum analysis)
// on audio connected to the Left Line-In pin. By changing code,
// a synthetic sine wave can be input instead.
//
// The first 40 (of 512) frequency analysis bins are printed to
// the Arduino Serial Monitor. Viewing the raw data can help you
// understand how the FFT works and what results to expect when
// using the data to control LEDs, motors, or other fun things!
//
// This example code is in the public domain.
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <ADC.h>
// CREATE THE ADC OBJECT FIRST, BEFORE ALL AUDIO STUFF!!
ADC *adc = new ADC(); // adc object
const int readPin = 30; // ADC1, Choose a pin the can be accessed by the ADC *NOT* being used to stream audio.
// Currently this must be a pin on ADC1, but has been suggested as a fix for the audio library.
// Create the Audio components. These should be created in the
// order data flows, inputs/sources -> processing -> outputs
// Using adafruit mic-amp, edit library to turn-off internal voltage reference in
// inputAnalog.cpp
AudioInputAnalog analogAudioIn(15); //Pin 15, mic pin, currently must be on ADC0
AudioSynthWaveformSine sinewave;
AudioAnalyzeFFT1024 myFFT;
// Connect either the live input or synthesized sine wave
AudioConnection patchCord1(analogAudioIn, 0, myFFT, 0);
//AudioConnection patchCord1(sinewave, 0, myFFT, 0);
void setup() {
// Audio connections require memory to work. For more
// detailed information, see the MemoryAndCpuUsage example
AudioMemory(12);
// Configure the window algorithm to use
//myFFT.windowFunction(AudioWindowHanning1024);
myFFT.windowFunction(NULL);
// Create a synthetic sine wave, for testing
// To use this, edit the connections above
sinewave.amplitude(0.8);
sinewave.frequency(1034.007);
adc->setAveraging(8, ADC_1); // set number of averages
adc->setResolution(12, ADC_1); // set bits of resolution
adc->setConversionSpeed(ADC_VERY_LOW_SPEED, ADC_1); // change the conversion speed
adc->setSamplingSpeed(ADC_VERY_LOW_SPEED, ADC_1); // change the sampling speed
}
int value = 0;
void loop() {
float n;
int i;
value = adc->analogRead(readPin, ADC_1); // read a new value, will return ADC_ERROR_VALUE if the comparison is false.
if (myFFT.available()) {
// each time new FFT data is available
// print it all to the Arduino Serial Monitor
//Serial.print("T: "); //Testing touchRead
//Serial.print(touchRead(0));
Serial.print("Pin: ");
Serial.print(readPin);
Serial.print(" = ");
Serial.print(value*3.3/adc->getMaxValue(ADC_1), DEC); //assuming 3.3v reference voltage
Serial.print("v FFT: ");
for (i=0; i<40; i++) {
n = myFFT.read(i);
if (n >= 0.008) {
Serial.print(n);
Serial.print(" ");
}
else {
Serial.print(" - "); // don't print "0.00"
}
}
Serial.print("\n");
}
}I've learned a lot from this issue! Thanks to everyone who helped!
