Arduino 新手發問

arkei663

各位師兄你們好
我是從網站上得知有arduino的
看見網上發表arduino 能做的事情很多
便買回家嘗試一下
我想做一個測試溫度的模組
從網站上得到用DS18B20 溫度傳感器模塊 的程式
我照著網頁上的教學去做
但在serial monitor 卻不停出現

""no more address""

我卻找不到原因

附上程式:

#include <OneWire.h>

/* DS18S20 Temperature chip i/o

*/

OneWire
ds(10);
// on pin 10

void setup(void) {

// initialize inputs/outputs

// start serial port

Serial.begin(9600);

}

void loop(void) {

byte i;

byte present = 0;

byte data[12];

byte addr[8];

int Temp;

if ( !ds.search(addr)) {

//Serial.print("No more addresses.\n");

ds.reset_search();

return;

}

Serial.print("R=");
//R=28 Not sure what this is

for( i = 0; i < 8; i++) {

Serial.print(addr, HEX);

Serial.print(" ");

}

if ( OneWire::crc8( addr, 7) != addr[7]) {

Serial.print("CRC is not valid!\n");

return;

}

if ( addr[0] != 0x28) {

Serial.print("Device is not a DS18S20 family device.\n");

return;

}

ds.reset();

ds.select(addr);

ds.write(0x44,1);

// start conversion, with parasite power on at the end

delay(1000);
// maybe 750ms is enough, maybe not

// we might do a ds.depower() here, but the reset will take care of it.

present = ds.reset();

ds.select(addr);

ds.write(0xBE);

// Read Scratchpad

Serial.print("P=");

Serial.print(present,HEX);

Serial.print(" ");

for ( i = 0; i < 9; i++) {

// we need 9 bytes

data = ds.read();

Serial.print(data, HEX);

Serial.print("
");

}

Temp=(data[1]<<8)+data[0];//take the two bytes from the response relating to temperature

Temp=Temp>>4;//divide by 16 to get pure celcius readout

//next line is Fahrenheit conversion

Temp=Temp*1.8+32; // comment this line out to get celcius

Serial.print("T=");//output the temperature to serial port

Serial.print(Temp);

Serial.print("
");

Serial.print(" CRC=");

Serial.print( OneWire::crc8( data, 8), HEX);

Serial.println();

}

請求各位師兄幫忙

coopermaa

你 DS18S20  接在哪一 pin ?

按照網頁的說法，好像還得加一顆 4.7k 電阻
http://www.arduino.cc/playground/Learning/OneWire

arkei663

我接了pin10, 而且4700電阻也接了

謝謝

coopermaa

改用 Dallas Temperature Control Library 試試看:
http://milesburton.com/Main_Page ... ure_Control_Library

如果這個也不行，肯定是線路問題

arkei663

我試試看, 謝謝師兄

coopermaa

luck for you!

alibuda174

參考這篇看看http://yehnan.blogspot.tw/2013/01/arduinods18b20.html