基于放大器LM358和驻极体麦克风

描述

声音传感器模块是一个简单的麦克风。基于放大器LM358和驻极体麦克风，可用于检测环境的声音强度。

Steps

• 将 Grove 电缆的一侧连接到声音传感器
• 将 Grove 电缆的另一端连接到 Grove 屏蔽的 A0
• 运行下面给出的代码
• 打开串口监视器（ctrl + shift + m）查看输出

Code

串行监视器在检测到声音时打印 LOUD, LOUD 否则它打印 Quiet

int soundDetectedPin = A0; // Use Pin 10 as our Input
int soundDetectedVal = HIGH; // This is where we record our Sound Measurement
boolean bAlarm = false;
unsigned long lastSoundDetectTime; // Record the time that we measured a sound
int soundAlarmTime = 500; // Number of milli seconds to keep the sound alarm high
void setup ()
{
 Serial.begin(9600);  
 pinMode (soundDetectedPin, INPUT) ; // input from the Sound Detection Module
}
void loop ()
{
 soundDetectedVal = analogRead (soundDetectedPin) ; // read the sound alarm time  
 //Serial.println(soundDetectedVal);
 if (soundDetectedVal > 400) // If we hear a sound //change this value for increasing/decreasing sensitivity
 {
   lastSoundDetectTime = millis(); // record the time of the sound alarm
   // The following is so you don't scroll on the output screen
   if (!bAlarm){
     Serial.println("LOUD, LOUD");
     bAlarm = true;
   }
 }
 else
 {
   if( (millis()-lastSoundDetectTime) > soundAlarmTime  &&  bAlarm){
     Serial.println("quiet");
       bAlarm = false;
   }
 }
}