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Hardware | SSD1306 monochrome OLED 를 가지고 VU meter 를 만들어보자

| Hardware 2017. 9. 19. 22:15
Posted by Erotic Chocoball

1. SSD1306 OLED


SSD1306 monochrome OLED 0.96" 를 가지고 신나게 놀았습니다.


- http://chocoball.tistory.com/entry/Hardware-SSD1306-128x64-monochrome-OLED


그러던 와중에 VU meter 를 구현한 분의 link 를 찾게 됩니다.

여기에 나와있는 모든 내용은 Arduino Forum 에 올린 "stievenart" 라는 분의 글을 따라한 것임을 밝힙니다.


- https://forum.arduino.cc/index.php?topic=403234.0


VU meter 라는 것은 예전에 전축을 보면, 소리의 강도를 나타내는 아나로그 미터기 입니다.


- https://en.wikipedia.org/wiki/VU_meter



이런 멋진걸 구현해 놓네요.




2. Layout


위의 링크 그대로 참조해서 연결합니다.


 128X64 OLED | Arduino Nano
----------------------------
     GND     |     GND
     VCC     |     3.3V
     SDA     |     A4
     SDL     |     A5
----------------------------
  TSSR Audio |
----------------------------
    SLEEVE   |     GND
     TIP     |     A0
----------------------------


Pin 연결 모습입니다.





3. Bitmap 만들기


방법은 Bitmap 파일을 128x64 pixel 로 만들고,

그것을 code 화 하면 됩니다.


모든것은 link 에서 설명되어 있습니다.


- https://forum.arduino.cc/index.php?topic=403234.0


Bitmap 을 LCD 용의 데이터로 만들어 주는 것은 "Image2GLCD" 이라는 어플이라고 합니다.


- http://www.ablab.in/image2glcd-software/


아래 bitmap 파일은 이 project 를 만든 사람이 직접 구성한 사진 입니다.



위의 bitmap 을 LCD용으로 데이터화 하면 아래와 같이 된다고 하네요.

// VU meter background mask image:
static const unsigned char PROGMEM VUMeter[] = { 
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};




4. Sketch


제작자가 만든 sketch 입니다.

한가지 주의할 점은, 원 제작자는 "SH1106" 을 사용했으므로, "SSD1306" 으로 모두 바꿔줘야 합니다.

수정할 곳은 3군데 입니다.


Library 는 Adafruit 용을 사용했으므로, 동일하게 사용하면 됩니다.


모두 SSD1306 으로 수정한 sketch 입니다.


/*  OLEDMeter was written to utilize any 128x64 display. I have only seen marginal attempts to
 *  animate meters and I hope this one will set a standard. Please feel free to modify and share
 *  this code for any 128x64 LCD or OLED. OLEDMeter sketch was written for use with I2C SH1106.
 *  This code must be modified to work with other display devices.
 *  
 *  Working portion of code was taken from Adafruit Example Sound Level Sketch for the
 *  Adafruit Microphone Amplifier
 *  https://learn.adafruit.com/adafruit-microphone-amplifier-breakout/measuring-sound-levels
 *  
 *  Remaining code was written by Greg Stievenart with no claim to or any images or information 
 *  provided in this code. Freely published May 26, 2016.
 *  
 *  Software to convert background mask to 128x64 at: http://www.ablab.in/image2glcd-software/
 *  
 *  IMPORTANT: Sound source must be grounded to the Arduino or other MCU's to work. Usually the
 *  base sleeve contact on TRS or TRRS connector is the ground.
 */

#include "Wire.h"                     // requried to run I2C SH1106
#include "SPI.h"                      // requried to run I2C SH1106
#include "Adafruit_GFX.h"             // https://github.com/adafruit/Adafruit-GFX-Library
#include "Adafruit_SSD1306.h"          // https://github.com/wonho-maker/Adafruit_SH1106

#define OLED_RESET 4                  // reset required for SH1106

Adafruit_SSD1306 display(OLED_RESET);  // reset required for SH1106

int analogInput = A0;                 // analog input for outside audio source
int hMeter = 65;                      // horizontal center for needle animation
int vMeter = 85;                      // vertical center for needle animation (outside of dislay limits)
int rMeter = 80;                      // length of needle animation or arch of needle travel

const int sampleWindow = 50;          // sample window width in mS (50 mS = 20Hz)
unsigned int sample;

// VU meter background mask image:
static const unsigned char PROGMEM VUMeter[] = { 
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  0x00, 0x30, 0x00, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x00,
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  0x00, 0x00, 0xA0, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x44, 0x00, 0x00, 0x00, 0x02, 0x02, 0x30, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x03, 0x06, 0x30, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x01, 0x8C, 0x30, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 0x00, 0xD8, 0x30, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x70, 0x19, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

void setup(){

  pinMode(analogInput, INPUT);                             // analog input for outside audio source
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);                // needed for SH1106 display
  display.clearDisplay();                                  // clears display from any library info displayed
}

void loop(){

/***********************************************************************
 Start of code taken from Adafruit Example Sound Level Sketch for the 
 Adafruit Microphone Amplifier
************************************************************************/
  
  unsigned long startMillis = millis();                    // start of sample window
  unsigned int PeaktoPeak = 0;                             // peak-to-peak level
  unsigned int SignalMax = 0;
  unsigned int SignalMin = 1024;

  while ( millis() - startMillis < sampleWindow ){

    sample = analogRead(analogInput);
    if (sample < 1024) {

      if (sample > SignalMax){

        SignalMax = sample;                                // saves just the max levels
      }

      else if (sample < SignalMin){

        SignalMin = sample;                                // saves just the min levels
      }
    }
  }

  PeaktoPeak = SignalMax - SignalMin;                      // max - min = peak-peak amplitude
  float MeterValue = PeaktoPeak * 330 / 1024;              // convert volts to arrow information

/****************************************************
 End of code taken from Adafruit Sound Level Sketch
*****************************************************/
  
  MeterValue = MeterValue - 34;                            // shifts needle to zero position
  display.clearDisplay();                                  // refresh display for next step
  display.drawBitmap(0, 0, VUMeter, 128, 64, WHITE);       // draws background
  int a1 = (hMeter + (sin(MeterValue / 57.296) * rMeter)); // meter needle horizontal coordinate
  int a2 = (vMeter - (cos(MeterValue / 57.296) * rMeter)); // meter needle vertical coordinate
  display.drawLine(a1, a2, hMeter, vMeter, WHITE);         // draws needle
  display.display();
}




5. 구동


아래는 실제로 구동한 사진 입니다.

iPhone 에서는 Youtube 로 동영상을 play 하였습니다.


곡 제목은 제가 좋아하는 피아니스트인 Valentina Lisitsa 가 연주한, 제가 좋아하는 "베토벤 월광 제3악장" 입니다.

(Beethoven "Moonlight" Sonata op 27 # 2 Mov 3)


- https://www.youtube.com/watch?v=zucBfXpCA6s



신기하게 잘 동작하는군요.

선명하게 눈금이 잘 보입니다.



가리키는 바늘도 잘 동작합니다.



눈금이 잘 반응하는게 보이죠?



흠흠... 좋습니다.



아래는 동영상 입니다.





FIN


우선 "stievenart" 님의 글을 구동 부분만 빼고 인용했음을 밝힙니다.

OLED 로 놀 수 있는 방법은 무궁무진한 것 같습니다.

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