Introduction: Play Grove Analog Microphone With Wio Terminal
The Grove-Analog Microphone is based on high-performance SiSonic MEMS technology, offering an extremely-low-noise, low-current, reliable, and small microphone to opensource hardware industry, and it has improved performance under severe conditions. Grove-Analog Microphone is an ideal choice of sound sensors where excellent audio performance is required. It can provide up to 20dB of gain and it also features low current, max RF protection, which makes it a perfect microphone for Arduino and Raspberry Pi.
This instructable is going to introduce how this Grove-Analog Microphone works via Serial Port commonly, and meanwhile we will display its excellent function on our new-born Wio Terminal, one of the most popular newly-published products of our Seeed Studio! Can't wait? Let's START!!!
Step 1: Play With Arduino
If this is the first time you work with Arduino, we firmly recommend you to see Getting Started with Arduino before the start.
Materials required:
Steps:
- Connect Grove-Sound Sensor to port A0 of Grove-Base Shield. And Plug Grove-Base Shield into Seeeduino and connect Seeeduino to PC via a USB cable.
- Please copy below code to Arduino IDE and upload. If you do not know how to upload the code, please check how to upload code.
/*
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>Success
Click on Serial > Plotter to get the changing curve of the sensor. Please make a noise to view the change of the value.
Step 2: Play With Wio Terminal
Materials required:
Steps:
- Plug Grove-Analog Microphone to Wio Terminal via Grove cable and also connect Wio Terminal to PC through a USB cable.
- Copy the demo code into your Arduino IDE and upload.
#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);
}Success
The image will display on the screen of Wio Terminal if everything goes well.
