Arduino

Question

我已经将蜂鸣器连接到引脚 13 并在我的 Arduino 上接地。

"Blink" 示例工作正常，蜂鸣器按预期每秒响起。

但是，当我尝试用我的代码做同样的嗡嗡声时，我无法让它在特定事件上发出嗡嗡声。这是一个本土安全系统 - 当门打开时，我希望 Arduino 检查一个 PHP 页面，其中 returns "armed" 如果系统已经布防。

除了蜂鸣器部分，其他一切似乎都正常。

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0D, 0xD3, 0x6C };
char serverName[] = "mysite.com";
String currentLine = "";
String armed = "No";

int nFrontWindow = 0;
int sFrontWindow = 1;
int kitchenWindow = 2;
int bedroomWindow = 3;
int frontDoor = 4;

int val0 = 0;
int val1 = 0;
int val2 = 0;
int val3 = 0;
int val4 = 0;

int threshold0 = 20;
int threshold1 = 20;
int threshold2 = 20;
int threshold3 = 20;
int threshold4 = 20;

int breach0 = 0;
int breach1 = 0;
int breach2 = 0;
int breach3 = 0;
int breach4 = 0;

int alarm0 = 0;
int alarm1 = 0;
int alarm2 = 0;
int alarm3 = 0;
int alarm4 = 0;

EthernetClient client;

void setup() {
  pinMode(13, OUTPUT);
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
  if(Ethernet.begin(mac) == 0) { // start ethernet using mac & IP address
    Serial.println("Failed to configure Ethernet using DHCP");  
    while(true)   // no point in carrying on, so stay in endless loop:
      ;
  }
  delay(1000); // give the Ethernet shield a second to initialize
}

void loop() {           

  // read the analog in values:
  val0 = analogRead(nFrontWindow); 
  val1 = analogRead(sFrontWindow);
  val2 = analogRead(kitchenWindow);
  val3 = analogRead(bedroomWindow);
  val4 = analogRead(frontDoor);

  // print the analog in values:                     

  if (val0 > threshold0)
  {
    Serial.print("nFrontWindow: ");
    Serial.print(val0); 
    Serial.print("\n");
    if (alarm0)
    {
      if (breach0 < 10)
        breach0++;
    }
    else
    {
      if (breach0 > 9)
      {
        alarm0 = 1;
        send_alert(0);
      }
      else
        breach0++;
    }
  }
  else 
  {
    if (alarm0)
    {
      if (breach0 > 0)
        breach0--;
      else
      {
        alarm0 = 0;
        send_alert(10);
      }
    }
    else
    {
      if (breach0 > 0)
        breach0--;
    }
  }

  if (val1 > threshold1)
  {
    Serial.print("sFrontWindow: ");
    Serial.print(val1); 
    Serial.print("\n");
    if (alarm1)
    {
      if (breach1 < 10)
        breach1++;
    }
    else
    {
      if (breach1 > 9)
      {
        alarm1 = 1;
        send_alert(1);
      }
      else
        breach1++;
    }
  }
  else 
  {
    if (alarm1)
    {
      if (breach1 > 0)
        breach1--;
      else
      {
        alarm1 = 0;
        send_alert(11);
      }
    }
    else
    {
      if (breach1 > 0)
        breach1--;
    }
  }

  if (val2 > threshold2)
  {
    Serial.print("kitchenWindow: ");
    Serial.print(val2); 
    Serial.print("\n");
    if (alarm2)
    {
      if (breach2 < 10)
        breach2++;
    }
    else
    {
      if (breach2 > 9)
      {
        alarm2 = 1;
        send_alert(2);
      }
      else
        breach2++;
    }
  }
  else 
  {
    if (alarm2)
    {
      if (breach2 > 0)
        breach2--;
      else
      {
        alarm2 = 0;
        send_alert(12);
      }
    }
    else
    {
      if (breach2 > 0)
        breach2--;
    }
  }

  if (val3 > threshold3)
  {
    Serial.print("bedroomWindow: ");
    Serial.print(val3); 
    Serial.print("\n");
    if (alarm3)
    {
      if (breach3 < 10)
        breach3++;
    }
    else
    {
      if (breach3 > 9)
      {
        alarm3 = 1;
        send_alert(3);
      }
      else
        breach3++;
    }
  }
  else 
  {
    if (alarm3)
    {
      if (breach3 > 0)
        breach3--;
      else
      {
        alarm3 = 0;
        send_alert(13);
      }
    }
    else
    {
      if (breach3 > 0)
        breach3--;
    }
  }

  if (val4 > threshold4)
  {
    Serial.print("frontDoor: ");
    Serial.print(val4);
    Serial.print("\n");

    if (alarm4)
    {
      if (breach4 < 10)
        breach4++;
    }
    else
    {
      if (breach4 > 9)
      {
        alarm4 = 1;
        send_alert(4);
      }
      else
        breach4++;
    }
  }
  else 
  {
    if (alarm4)
    {
      if (breach4 > 0)
        breach4--;
      else
      {
        alarm4 = 0;
        send_alert(14);
      }
    }
    else
    {
      if (breach4 > 0)
        breach4--;
    }
  }

  delay(100);                     
}

void send_alert(int pin)
{
  if (client.connect(serverName, 80)>0) {
    client.flush();
    Serial.print("\nconnected... ");

    String link = "GET [PHP FILE GOES HERE]";
    link += pin;
    link += " HTTP/1.1";

    Serial.print("Sending alert code: ");
    Serial.print(pin);
    Serial.print("\n\n");


    client.println(link);
    client.println("Host: mysite.com");
    client.println("User-Agent: arduino-ethernet");
    client.println("Connection: close");  
    client.println();
    delay(3000);

  } else {
    Serial.println("connection failed");
    //handle this
  }
    Serial.print("Server response:\n");
    Serial.print("----------------\n");
    while(client.available()){
      char c = client.read();
      Serial.print(c);
      currentLine += c;
      if (c == '\n') {
        currentLine = "";
      }

      if (currentLine.endsWith("armed"))
      {
        if (pin == 4 || pin == 3 || pin == 2 || pin == 1 || pin == 0)
        {
          Serial.print("\nBZZZZZZZZZZ\n");
          digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
          delay(1000);              // wait for a second
          digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
          delay(1000);              // wait for a second
        }
      }
    }
    Serial.print("\n----------------\n");

    //else
     //  Serial.println("result not found");
    client.stop();
    client.flush();
}

Answer 1

我认为你的问题是 Ethernet Shield 使用了 pin 13。引脚 10、11 和 12 也是如此。因此请使用其他引脚。

Answer 2

我认为你的问题是你没有生成方波来发出蜂鸣器的声音。由于您使用的是 Arduino，您可以只使用 tone() 和 noTone() 函数，在 Arduino site.

中有很好的解释

Arduino - 无法让蜂鸣器发出嗡嗡声

Arduino - cannot get buzzer to buzz