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 provided1,042

Things used in this project

Hardware components

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

Software apps and online services

Arduino IDE
Arduino IDE


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Demo Code for Arduino

  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:

Demo Code for Wio Terminal

#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_BUZZER, OUTPUT);
    spr.createSprite(TFT_HEIGHT, TFT_WIDTH);

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

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);

        analogWrite(WIO_BUZZER, 0);


    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")

    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
        .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
    } 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)
        if(dB > 50){
        spr.drawString(" dB",80 + 100,110,1);
    spr.pushSprite(0, 0);




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