Update ESP32_Spectrum_Display_02.ino
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/* ESP8266/32 Audio Spectrum Analyser on an SSD1306/SH1106 Display
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/* ESP8266/32 Audio Spectrum Analyser on an SSD1306/SH1106 Display
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* The MIT License (MIT) Copyright (c) 2017 by David Bird.
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* The MIT License (MIT) Copyright (c) 2017 by David Bird.
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* The formulation and display of an AUdio Spectrum using an ESp8266 or ESP32 and SSD1306 or SH1106 OLED Display using a Fast Fourier Transform
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* The formulation and display of an AUdio Spectrum using an ESp8266 or ESP32 and SSD1306 or SH1106 OLED Display using a Fast Fourier Transform
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge,
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* (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, but not to use it commercially for profit making or to sub-license and/or to sell copies of the Software or to
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* publish, distribute, but not to use it commercially for profit making or to sub-license and/or to sell copies of the Software or to
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* permit persons to whom the Software is furnished to do so, subject to the following conditions:
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* permit persons to whom the Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* See more at http://dsbird.org.uk
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* See more at http://dsbird.org.uk
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*/
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*/
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#include <Wire.h>
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#include <Wire.h>
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#include "arduinoFFT.h" // Standard Arduino FFT library
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#include "arduinoFFT.h" // Standard Arduino FFT library
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arduinoFFT FFT = arduinoFFT();
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// https://github.com/kosme/arduinoFFT, in IDE, Sketch, Include Library, Manage Library, then search for FFT
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/////////////////////////////////////////////////////////////////////////
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arduinoFFT FFT = arduinoFFT();
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// Comment out the display your nNOT using e.g. if you have a 1.3" display comment out the SSD1306 library and object
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/////////////////////////////////////////////////////////////////////////
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//#include "SH1106.h" // https://github.com/squix78/esp8266-oled-ssd1306
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// Comment out the display your nNOT using e.g. if you have a 1.3" display comment out the SSD1306 library and object
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//SH1106 display(0x3c, 21,22); // 1.3" OLED display object definition (address, SDA, SCL) Connect OLED SDA , SCL pins to ESP SDA, SCL pins
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//#include "SH1106.h" // https://github.com/squix78/esp8266-oled-ssd1306
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//SH1106 display(0x3c, 21,22); // 1.3" OLED display object definition (address, SDA, SCL) Connect OLED SDA , SCL pins to ESP SDA, SCL pins
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#include "SSD1306.h" // https://github.com/squix78/esp8266-oled-ssd1306
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SSD1306 display(0x3c, 5,4); // 0.96" OLED display object definition (address, SDA, SCL) Connect OLED SDA , SCL pins to ESP SDA, SCL pins
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#include "SSD1306.h" // https://github.com/squix78/esp8266-oled-ssd1306
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/////////////////////////////////////////////////////////////////////////
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SSD1306 display(0x3c, 5,4); // 0.96" OLED display object definition (address, SDA, SCL) Connect OLED SDA , SCL pins to ESP SDA, SCL pins
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#define SAMPLES 512 // Must be a power of 2
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/////////////////////////////////////////////////////////////////////////
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#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 Fmax=sampleF/2.
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#define SAMPLES 512 // Must be a power of 2
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#define amplitude 200 // Depending on your audio source level, you may need to increase this value
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#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 Fmax=sampleF/2.
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unsigned int sampling_period_us;
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#define amplitude 200 // Depending on your audio source level, you may need to increase this value
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unsigned long microseconds;
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unsigned int sampling_period_us;
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byte peak[] = {0,0,0,0,0,0,0};
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unsigned long microseconds;
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double vReal[SAMPLES];
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byte peak[] = {0,0,0,0,0,0,0};
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double vImag[SAMPLES];
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double vReal[SAMPLES];
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unsigned long newTime, oldTime;
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double vImag[SAMPLES];
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/////////////////////////////////////////////////////////////////////////
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unsigned long newTime, oldTime;
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void setup() {
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/////////////////////////////////////////////////////////////////////////
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Serial.begin(115200);
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void setup() {
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Wire.begin(5,4); // SDA, SCL
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Serial.begin(115200);
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display.init();
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Wire.begin(5,4); // SDA, SCL
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display.setFont(ArialMT_Plain_10);
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display.init();
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display.flipScreenVertically(); // Adjust to suit or remove
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display.setFont(ArialMT_Plain_10);
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sampling_period_us = round(1000000 * (1.0 / SAMPLING_FREQUENCY));
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display.flipScreenVertically(); // Adjust to suit or remove
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}
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sampling_period_us = round(1000000 * (1.0 / SAMPLING_FREQUENCY));
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}
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void loop() {
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display.clear();
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void loop() {
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display.drawString(0,0,"0.1 0.2 0.5 1K 2K 4K 8K");
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display.clear();
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for (int i = 0; i < SAMPLES; i++) {
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display.drawString(0,0,"0.1 0.2 0.5 1K 2K 4K 8K");
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newTime = micros()-oldTime;
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for (int i = 0; i < SAMPLES; i++) {
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oldTime = newTime;
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newTime = micros()-oldTime;
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vReal[i] = analogRead(A0); // A conversion takes about 1uS on an ESP32
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oldTime = newTime;
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vImag[i] = 0;
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vReal[i] = analogRead(A0); // A conversion takes about 1uS on an ESP32
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while (micros() < (newTime + sampling_period_us)) { /* do nothing to wait */ }
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vImag[i] = 0;
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}
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while (micros() < (newTime + sampling_period_us)) { /* do nothing to wait */ }
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FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
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}
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FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
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FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
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FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
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FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
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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.
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FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
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if (vReal[i] > 2000) { // Add a crude noise filter, 10 x amplitude or more
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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.
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if (i<=2 ) displayBand(0,(int)vReal[i]/amplitude); // 125Hz
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if (vReal[i] > 2000) { // Add a crude noise filter, 10 x amplitude or more
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if (i >3 && i<=5 ) displayBand(1,(int)vReal[i]/amplitude); // 250Hz
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if (i<=2 ) displayBand(0,(int)vReal[i]/amplitude); // 125Hz
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if (i >5 && i<=7 ) displayBand(2,(int)vReal[i]/amplitude); // 500Hz
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if (i >3 && i<=5 ) displayBand(1,(int)vReal[i]/amplitude); // 250Hz
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if (i >7 && i<=15 ) displayBand(3,(int)vReal[i]/amplitude); // 1000Hz
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if (i >5 && i<=7 ) displayBand(2,(int)vReal[i]/amplitude); // 500Hz
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if (i >15 && i<=30 ) displayBand(4,(int)vReal[i]/amplitude); // 2000Hz
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if (i >7 && i<=15 ) displayBand(3,(int)vReal[i]/amplitude); // 1000Hz
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if (i >30 && i<=53 ) displayBand(5,(int)vReal[i]/amplitude); // 4000Hz
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if (i >15 && i<=30 ) displayBand(4,(int)vReal[i]/amplitude); // 2000Hz
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if (i >53 && i<=200 ) displayBand(6,(int)vReal[i]/amplitude); // 8000Hz
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if (i >30 && i<=53 ) displayBand(5,(int)vReal[i]/amplitude); // 4000Hz
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if (i >200 ) displayBand(7,(int)vReal[i]/amplitude); // 16000Hz
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if (i >53 && i<=200 ) displayBand(6,(int)vReal[i]/amplitude); // 8000Hz
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//Serial.println(i);
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if (i >200 ) displayBand(7,(int)vReal[i]/amplitude); // 16000Hz
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}
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//Serial.println(i);
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for (byte band = 0; band <= 6; band++) display.drawHorizontalLine(18*band,64-peak[band],14);
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}
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}
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for (byte band = 0; band <= 6; band++) display.drawHorizontalLine(18*band,64-peak[band],14);
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if (millis()%4 == 0) {for (byte band = 0; band <= 6; band++) {if (peak[band] > 0) peak[band] -= 1;}} // Decay the peak
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}
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display.display();
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if (millis()%4 == 0) {for (byte band = 0; band <= 6; band++) {if (peak[band] > 0) peak[band] -= 1;}} // Decay the peak
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}
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display.display();
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}
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void displayBand(int band, int dsize){
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int dmax = 50;
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void displayBand(int band, int dsize){
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if (dsize > dmax) dsize = dmax;
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int dmax = 50;
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if (band == 7) display.drawHorizontalLine(18*6,0, 14);
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if (dsize > dmax) dsize = dmax;
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for (int s = 0; s <= dsize; s=s+2){display.drawHorizontalLine(18*band,64-s, 14);}
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if (band == 7) display.drawHorizontalLine(18*6,0, 14);
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if (dsize > peak[band]) {peak[band] = dsize;}
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for (int s = 0; s <= dsize; s=s+2){display.drawHorizontalLine(18*band,64-s, 14);}
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}
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if (dsize > peak[band]) {peak[band] = dsize;}
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}
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