我试图使用Arduino和Piezo Buzzer生成敲击探测器 . 在这个项目中使用的那个与在这张图片中相同
使用此代码
const int outputPin = 8; // led indicator connected to digital pin
const int knockSensor = A0; // the piezo is connected to an analog pin
const int thresholdHIGH =150; // threshold value to decide when the detected knock is hard (HIGH)
const int thresholdLOW = 120; // threshold value to decide when the detected knock is gentle (LOW)
const int secretKnockLength = 4; //How many knocks are in your secret knock
/* This is the secret knock sequence
* 0 represents a LOW or quiet knock
* 1 represents a HIGH or loud knock
* The sequence can be as long as you like, but longer codes increase the difficulty of matching */
const int secretKnock[secretKnockLength] = {0, 0, 1, 0};
int secretCounter = 0; //this tracks the correct knocks and allows you to move through the sequence
int sensorReading = 0; // variable to store the value read from the sensor pin
void setup() {
//Set the output pin as an OUTPUT
pinMode(outputPin, OUTPUT);
//analogWrite(knockSensor, LOW);
//Begin Serial Communication.
Serial.begin(9600);
}
void loop() {
// read the piezo sensor and store the value in the variable sensorReading:
sensorReading = analogRead(knockSensor);
Serial.print ("Valor del Sensor: ");
Serial.println(sensorReading);
// First determine is knock if Hard (HIGH) or Gentle (LOW)
//Hard knock (HIGH) is detected
if (sensorReading >= thresholdHIGH) {
//Check to see if a Hard Knock matches the Secret Knock in the correct sequence.
if (secretKnock[secretCounter] == 1) {
//The Knock was correct, iterate the counter.
secretCounter++;
Serial.println("Correct");
} else {
//The Knock was incorrect, reset the counter
secretCounter = 0;
Serial.println("Fail");
digitalWrite(outputPin, LOW);
}//close if
//Allow some time to pass before sampling again to ensure a clear signal.
delay(100);
//Gentle knock (LOW) is detected
} else if (sensorReading >= thresholdLOW) {
//Check to see if a Gentle Knock matches the Secret Knock in the correct sequence.
if (secretKnock[secretCounter] == 0) {
//The Knock was correct, iterate the counter.
secretCounter++;
Serial.println("Correct");
} else {
//The Knock was incorrect, reset the counter.
secretCounter = 0;
Serial.println("Fail");
}//close if
//Allow some time to pass before sampling again to ensure a clear signal.
delay(100);
}//close if else
//Check for successful entry of the code, by seeing if the entire array has been walked through.
if (secretCounter == (secretKnockLength) ) {
Serial.println("Welcome");
//if the sececret knock is correct, illuminate the LED for a couple seconds
digitalWrite(outputPin, HIGH);
//Reset the secret counter to 0.
secretCounter = 0;
}//close success check
}//close loop".
我的问题是蜂鸣器什么都没检测到 . 我不知道这是因为蜂鸣器不是正确的或其他东西 .
任何的想法？