/*
Simple Wokwi Microphone Demo - hacked to include a frequency analyzer
it doesn't work very well
http://wiki.openmusiclabs.com/wiki/ArduinoFHT
*/
#define LOG_OUT 1 // use the log output function
#define FHT_N 256
#define NUM_LEDS 8
#include "FHT.h"
#include <FastLED.h>
CRGB leds[NUM_LEDS];
void setup() {
FastLED.addLeds<NEOPIXEL, 5>(leds, NUM_LEDS);
Serial.begin(115200);
pinMode(13, OUTPUT);
// TIMSK0 = 0; // turn off timer0 for lower jitter (hangs avr8js)
ADCSRA = 0xe5; // set the adc to free running mode
ADMUX = 0x40; // use adc0
DIDR0 = 0x01; // turn off the digital input for adc0
}
void loop() {
cli(); // UDRE interrupt slows this way down on arduino1.0
if (1) {
for (int i = 0 ; i < FHT_N ; i++) { // save 256 samples
// while (!(ADCSRA & 0x10)); // wait for adc to be ready (hangs avr8js)
ADCSRA = 0xf5; // restart adc
byte m = ADCL; // fetch adc data
byte j = ADCH;
int k = (j << 8) | m; // form into an int
k -= 0x0200; // form into a signed int
k <<= 6; // form into a 16b signed int
fht_input[i] = k; // put real data into bins
}
} else {
for (int i = 0 ; i < FHT_N ; i++) { // save 128 samples
int16_t k = (analogRead(A0) - 512) << 6;
fht_input[i] = k; // put real data into bins
}
}
fht_window(); // window the data for better frequency response
fht_reorder(); // reorder the data before doing the fht
fht_run(); // process the data in the fht
fht_mag_log(); // take the output of the fht
sei();
for (uint8_t i = 0; i < NUM_LEDS; i++)
leds[i] = HeatColor(fht_log_out[i]);
FastLED.show();
}