Arduino超聲波距離傳感器

我想從我的傳感器接收信息，但是我的輸出始終只是0，在我的代碼中是否有錯誤？所有硬件相關的都做得很好。Arduino超聲波距離傳感器

loop() 
{ 
    long duration, inches, cm; 

    pinMode(pingPin, OUTPUT); 
    digitalWrite(pingPin, LOW); 
    delayMicroseconds(2); 
    digitalWrite(pingPin, HIGH); 
    delayMicroseconds(5); 
    digitalWrite(pingPin, LOW); 

    pinMode(pingPin, INPUT); 
    duration = pulseIn(pingPin, HIGH); 

    inches = microsecondsToInches(duration); 
    cm = microsecondsToCentimeters(duration); 

    Serial.print(inches); 
    Serial.print("in; "); 
    Serial.print(cm); 
    Serial.print("cm"); 
    Serial.println(); 
} 

long microsecondsToInches(long microseconds) 
{ 
    return microseconds/74/2; 
} 

long microsecondsToCentimeters(long microseconds) 
{ 
    return microseconds/29/2; 
}

來源

2013-07-03 Ted

你打印'duration'了呢？ – zmo

'pingPin'？ '持續時間'的價值是什麼？ –

pingPin是我用來ping的引腳，我知道這個網站堅持不把自己理解的代碼，但它是一個值爲7的常量整數。我使用最後兩個函數來使用它們各自的公式將持續時間轉換爲距離。此外，這是我使用的傳感器的型號http://www.amazon.co.uk/gp/product/B008AFFC9G/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1 – Ted

多次嘗試和感謝約翰·B的幫助後，將其計算出的正確答案就如何正確使用這種傳感器，它工程完全按照需要，輸出完美地測量

#include <SoftwareSerial.h> 

// TX_PIN is not used by the sensor, since that the it only transmits! 
#define PING_RX_PIN 6 
#define PING_TX_PIN 7 

SoftwareSerial mySerial(PING_RX_PIN, PING_TX_PIN); 

long inches = 0, mili = 0; 
byte mybuffer[4] = {0}; 
byte bitpos = 0; 

void setup() { 
    Serial.begin(9600); 

    mySerial.begin(9600); 
} 


void loop() { 
    bitpos = 0; 
    while (mySerial.available()) { 
    // the first byte is ALWAYS 0xFF and I'm not using the checksum (last byte) 
    // if your print the mySerial.read() data as HEX until it is not available, you will get several measures for the distance (FF-XX-XX-XX-FF-YY-YY-YY-FF-...). I think that is some kind of internal buffer, so I'm only considering the first 4 bytes in the sequence (which I hope that are the most recent! :D) 
    if (bitpos < 4) { 
     mybuffer[bitpos++] = mySerial.read(); 
    } else break; 
    } 
    mySerial.flush(); // discard older values in the next read 

    mili = mybuffer[1]<<8 | mybuffer[2]; // 0x-- : 0xb3b2 : 0xb1b0 : 0x-- 
    inches = 0.0393700787 * mili; 
    Serial.print("PING: "); 
    Serial.print(inches); 
    Serial.print("in, "); 
    Serial.print(mili); 
    Serial.print("mili"); 
    Serial.println(); 

    delay(100); 
}

來源

2013-07-03 14:33:51 Ted