/* 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_SH1106.h> // https://github.com/wonho-maker/Adafruit_SH1106
#include <Adafruit_SSD1306.h>
#define OLED_RESET 4 // reset required for SH1106
//Adafruit_SH1106 display(OLED_RESET); // reset required for SH1106
Adafruit_SSD1306 display(OLED_RESET); // create instance of OLED display
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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};
void setup(){
pinMode(analogInput, INPUT); // analog input for outside audio source
// display.begin(SH1106_SWITCHCAPVCC, 0x3C); // needed for SH1106 display
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();
}