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Grove Analog Microphone displaying on Wio Terminal

This project is going to introduce how this Grove-Analog Microphone works via Serial Port and Wio Terminal!

IntermediateFull instructions provided250

Things used in this project

Hardware components

Seeeduino V4.2
Seeeduino V4.2
×1
Base Shield V2
Seeed Base Shield V2
×1
Seeed Wio Terminal
×1
Seeed Grove-Analog Microphone
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

Demo Code for Arduino

C/C++
/*
  Analog input, analog output, serial output

  Reads an analog input pin, maps the result to a range from 0 to 255 and uses
  the result to set the pulse width modulation (PWM) of an output pin.
  Also prints the results to the Serial Monitor.
*/

// These constants won't change. They're used to give names to the pins used:
const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to

int sensorValue = 0;        // value read from the pot
int outputValue = 0;        // value output to the PWM (analog out)

void setup() {             
  Serial.begin(9600);      // initialize serial communications at 9600 bps
}

void loop() {
  sensorValue = analogRead(analogInPin);        // read the analog in value
  outputValue = map(sensorValue, 0, 1023, 0, 255);       // map it to the range of the analog out
  analogWrite(analogOutPin, outputValue);               // change the analog out value

  Serial.println(outputValue);    // print the results to the Serial Monitor

  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after the last reading:
  delay(2);
}<br>

Demo Code for Wio Terminal

C/C++
#include "seeed_line_chart.h" //include the library

TFT_eSPI tft;
#define LINE_DIS 0X00
#define STRING_DIS 0X01
#define max_size 30 //maximum size of data
doubles data;       //Initilising a doubles type to store data
int brightness;
TFT_eSprite spr = TFT_eSprite(&tft); // Sprite

const int MIC = A0; //the microphone amplifier output is connected to pin A0
int adc;
int dB, PdB; //the variable that will hold the value read from the microphone each time
uint8_t mode = LINE_DIS;
void setup()
{
    Serial.begin(9600); //sets the baud rate at 9600 so we can check the values the microphone is obtaining on the Serial Monitor
    pinMode(A0, INPUT);
    pinMode(WIO_KEY_C, INPUT_PULLUP);
    pinMode(WIO_BUZZER, OUTPUT);
    tft.begin();
    spr.createSprite(TFT_HEIGHT, TFT_WIDTH);
    spr.setRotation(3);
    tft.setRotation(3);
}

void loop() {
 
    if (digitalRead(WIO_KEY_C) == LOW) {
        mode ++;
        if(mode > STRING_DIS ) mode = LINE_DIS;
        while(!digitalRead(WIO_KEY_C));
    }
    display(mode);
}

void display(uint8_t mode)
{
    adc = analogRead(MIC); //Read the ADC value from amplifer
    //Serial.println (adc);//Print ADC for initial calculation
    dB = (adc + 83.2073) / 7.003; //Convert ADC value to dB using Regression values

    if(dB > 50)
    {
        analogWrite(WIO_BUZZER, 128);

    }else{
        analogWrite(WIO_BUZZER, 0);
    }

    spr.fillSprite(TFT_WHITE);

    if (data.size() == max_size)
    {
        data.pop(); //this is used to remove the first read variable
    }
    data.push(dB); //read variables and store in data

    //Settings for the line graph title
    auto header = text(0, 0)
                      .value("MIC DB Readings")
                      .align(center)
                      .valign(vcenter)
                      .width(tft.width())
                      .thickness(2);

    header.height(header.font_height() * 2);
    header.draw(); //Header height is the twice the height of the font
    if (LINE_DIS == mode){
    //Settings for the line graph
    auto content = line_chart(20, header.height()); //(x,y) where the line graph begins
    content
        .height(tft.height() - header.height() * 1.5) //actual height of the line chart
        .width(tft.width() - content.x() * 2)         //actual width of the line chart
        .based_on(0.0)                                //Starting point of y-axis, must be a float
        .show_circle(false)                           //drawing a cirle at each point, default is on.
        .value(data)                                  //passing through the data to line graph
        .color(TFT_RED)                               //Setting the color for the line
        .draw();
    } else if (STRING_DIS == mode){
        for(int8_t line_index = 0;line_index < 5 ; line_index++)
        {
            spr.drawLine(0, 50 + line_index, tft.width(), 50 + line_index, TFT_GREEN);
        }        
        auto header =  text(0, 0)
                    .thickness(1);
        spr.setFreeFont(&FreeSansBoldOblique24pt7b); 
        if(dB > 50){
            spr.setTextColor(TFT_RED);
        }else{
            spr.setTextColor(TFT_BLUE);
        }
        spr.drawFloat(dB,2,70,110);
        spr.drawString(" dB",80 + 100,110,1);
    }
    spr.pushSprite(0, 0);
    delay(100);
}

Credits

Seeed

Seeed

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