initial commit

microphone_esp8266_fft/Arduino/microphone_esp8266_fft/microphone_esp8266_fft.ino

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+#include <arduinoFFT.h>      //https://github.com/kosme/arduinoFFT
+//                           //https://github.com/G6EJD/ESP32-8266-Audio-Spectrum-Display
+
+#define NUM_BANDS  8
+#define READ_DELAY 50
+#define USE_RANDOM_DATA false
+
+#include <WS2812FX.h>        //https://github.com/kitesurfer1404/WS2812FX
+#include "custom/VUMeter.h"  //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+arduinoFFT FFT = arduinoFFT();
+
+#define SAMPLES 512              //Must be a power of 2
+#define SAMPLING_FREQUENCY 40000 //Hz, must be 40000 or less due to ADC conversion time. Determines maximum frequency that can be analysed by the FFT.
+
+// Use ADC1 so that WiFi stuff doesnt interfere with ADC measurements
+#define ADC_PIN 36 // 36 = PIN VP on Lolin D32
+
+int amplitude = 200;
+unsigned int sampling_period_us;
+unsigned long microseconds;
+byte peak[] = {0, 0, 0, 0, 0, 0, 0};
+double vReal[SAMPLES];
+double vImag[SAMPLES];
+unsigned long newTime, oldTime;
+
+// LED Settings
+#define LED_COUNT 120
+#define LED_PIN   12
+
+WS2812FX ws2812fx = WS2812FX(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
+
+void displayBand(int band, int dsize)
+{
+  int dmax = amplitude;
+  if (dsize > dmax)
+    dsize = dmax;
+  if (dsize > peak[band])
+  {
+    peak[band] = dsize;
+  }
+}
+
+void setup()
+{
+  Serial.begin(256000);
+  sampling_period_us = round(1000000 * (1.0 / SAMPLING_FREQUENCY));
+  pinMode(ADC_PIN, INPUT);
+
+  ws2812fx.init();
+  ws2812fx.setBrightness(32);
+
+  // setup the custom effect
+  uint32_t colors[] = {GREEN, YELLOW, RED};
+  uint8_t vuMeterMode = ws2812fx.setCustomMode(F("VU Meter"), vuMeter);
+  ws2812fx.setSegment(0, 0, LED_COUNT-1, vuMeterMode, colors, READ_DELAY, NO_OPTIONS);
+
+  ws2812fx.start();
+}
+
+void loop()
+{
+  for (int i = 0; i < SAMPLES; i++)
+  {
+    newTime = micros() - oldTime;
+    oldTime = newTime;
+    vReal[i] = analogRead(ADC_PIN); // A conversion takes about 1mS on an ESP8266
+    vImag[i] = 0;
+    while (micros() < (newTime + sampling_period_us))
+    {
+      delay(0);
+    }
+  }
+  FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
+  FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
+  FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
+  for (int i = 2; i < (SAMPLES / 2); i++)
+  { // Don't use sample 0 and only first SAMPLES/2 are usable. Each array eleement represents a frequency and its value the amplitude.
+    if (vReal[i] > 2000)
+    { // Add a crude noise filter, 10 x amplitude or more
+      if (i <= 2)
+        displayBand(0, (int)vReal[i] / amplitude); // 125Hz
+      if (i > 3 && i <= 5)
+        displayBand(1, (int)vReal[i] / amplitude); // 250Hz
+      if (i > 5 && i <= 7)
+        displayBand(2, (int)vReal[i] / amplitude); // 500Hz
+      if (i > 7 && i <= 15)
+        displayBand(3, (int)vReal[i] / amplitude); // 1000Hz
+      if (i > 15 && i <= 30)
+        displayBand(4, (int)vReal[i] / amplitude); // 2000Hz
+      if (i > 30 && i <= 53)
+        displayBand(5, (int)vReal[i] / amplitude); // 4000Hz
+      if (i > 53 && i <= 200)
+        displayBand(6, (int)vReal[i] / amplitude); // 8000Hz
+      if (i > 200)
+        displayBand(7, (int)vReal[i] / amplitude); // 16000Hz
+    }
+  }
+  if (millis() % 4 == 0)
+  {
+    for (byte band = 0; band < NUM_BANDS; band++)
+    {
+      if (peak[band] > 0)
+        peak[band] /= 2;
+    }
+  } // Decay the peak
+  for (byte band = 0; band < NUM_BANDS; band++)
+  {
+    uint16_t value = peak[band];
+    vuMeterBands[band] = value < 1 ? 0 : map(value, 1, amplitude, 0, 255);
+    Serial.print(value);
+    Serial.print("\t");
+  }
+  Serial.println();
+
+  ws2812fx.service();
+}

microphone_esp8266_fft/platformio.ini

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+[platformio]
+src_dir = ./Arduino/microphone_esp8266_fft
+env_default = esp32dev
+
+[common]
+framework = arduino
+build_flags =
+  -w
+  -D PIO_PLATFORM
+lib_deps =
+  arduinoFFT
+  WS2812FX
+  debsahu/MD_MSGEQ7
+; monitor_speed = 115200
+monitor_speed = 256000
+upload_speed = 115200
+upload_speed_fast = 921600
+targets_eum = erase, upload, monitor
+targets_um = upload, monitor
+
+# see: http://docs.platformio.org/en/latest/platforms/espressif32.html
+[common:esp32]
+framework = ${common.framework}
+platform = espressif32@1.7.0
+;platform = https://github.com/platformio/platform-espressif32.git#feature/stage
+build_flags =
+  ${common.build_flags}
+  -D ARDUINO_ARCH_ESP32
+monitor_speed = ${common.monitor_speed}
+upload_speed = ${common.upload_speed}
+upload_speed_fast = ${common.upload_speed_fast}
+lib_deps =
+  ${common.lib_deps}
+lib_ignore =
+  DDUpdateUploadServer
+
+[env:esp32dev]
+; board = esp32dev
+board = lolin_d32
+framework = ${common.framework}
+platform = ${common:esp32.platform}
+monitor_speed = ${common:esp32.monitor_speed}
+upload_speed = ${common:esp32.upload_speed_fast}
+build_flags =
+  ${common:esp32.build_flags}
+lib_deps =
+  ${common:esp32.lib_deps}
+  PubSubClient
+lib_ignore =
+  ${common:esp32.lib_ignore}
+;targets = ${common.targets_um}

microphone_esp8266_msgeq7/Arduino/microphone_esp8266_msgeq7/microphone_esp8266_msgeq7.ino

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+#include <MD_MSGEQ7.h>      //https://github.com/debsahu/MD_MSGEQ7
+
+#define NUM_BANDS MAX_BAND
+#define USE_RANDOM_DATA false
+
+#include <WS2812FX.h>       //https://github.com/kitesurfer1404/WS2812FX
+#include "custom/VUMeter.h" //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+// hardware pin definitions - change to suit circuit
+#define DATA_PIN    34
+#define RESET_PIN   27
+#define STROBE_PIN  26
+
+// frequency reading the IC data
+#define READ_DELAY  50
+
+// LED Settings
+#define LED_COUNT 120
+#define LED_PIN   12
+
+MD_MSGEQ7 MSGEQ7(RESET_PIN, STROBE_PIN, DATA_PIN);
+WS2812FX ws2812fx = WS2812FX(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
+
+void setup() 
+{
+  Serial.begin(256000);
+  Serial.println("[MD_MSG_SEQ7_Serial]");
+  MSGEQ7.begin();
+  analogReadResolution(10);
+
+  ws2812fx.init();
+  ws2812fx.setBrightness(255);
+
+  // setup the custom effect
+  uint32_t colors[] = {GREEN, YELLOW, RED};
+  uint8_t vuMeterMode = ws2812fx.setCustomMode(F("VU Meter"), vuMeter);
+  ws2812fx.setSegment(0, 0, LED_COUNT-1, vuMeterMode, colors, READ_DELAY, NO_OPTIONS);
+
+  ws2812fx.start();
+}
+
+void loop() 
+{
+  static long then = 0;
+  long now = millis();
+
+  if(now > then + READ_DELAY) {
+
+    MSGEQ7.read();
+
+    // Serial output
+    for (uint8_t i=0; i<MAX_BAND; i++)
+    {
+      uint16_t value = MSGEQ7.get(i);
+      vuMeterBands[i] = value < 40 ? 0 : map(value, 40, 1023, 0, 255);
+      Serial.print(value);
+      Serial.print('\t');
+    }
+    Serial.println();
+    then = now;
+  }
+
+  ws2812fx.service();
+}

microphone_esp8266_msgeq7/platformio.ini

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+[platformio]
+src_dir = ./Arduino/microphone_esp8266_msgeq7
+env_default = esp32dev
+
+[common]
+framework = arduino
+build_flags =
+  -w
+  -D PIO_PLATFORM
+lib_deps =
+  arduinoFFT
+  WS2812FX
+  debsahu/MD_MSGEQ7
+; monitor_speed = 115200
+monitor_speed = 256000
+upload_speed = 115200
+upload_speed_fast = 921600
+targets_eum = erase, upload, monitor
+targets_um = upload, monitor
+
+# see: http://docs.platformio.org/en/latest/platforms/espressif32.html
+[common:esp32]
+framework = ${common.framework}
+platform = espressif32@1.7.0
+;platform = https://github.com/platformio/platform-espressif32.git#feature/stage
+build_flags =
+  ${common.build_flags}
+  -D ARDUINO_ARCH_ESP32
+monitor_speed = ${common.monitor_speed}
+upload_speed = ${common.upload_speed}
+upload_speed_fast = ${common.upload_speed_fast}
+lib_deps =
+  ${common.lib_deps}
+lib_ignore =
+  DDUpdateUploadServer
+
+[env:esp32dev]
+; board = esp32dev
+board = lolin_d32
+framework = ${common.framework}
+platform = ${common:esp32.platform}
+monitor_speed = ${common:esp32.monitor_speed}
+upload_speed = ${common:esp32.upload_speed_fast}
+build_flags =
+  ${common:esp32.build_flags}
+lib_deps =
+  ${common:esp32.lib_deps}
+  PubSubClient
+lib_ignore =
+  ${common:esp32.lib_ignore}
+;targets = ${common.targets_um}