标题: Arduino驱动DS18x20代码 [打印本页]
作者: zhaozhenhong    时间: 2017-10-18 11:30
标题: Arduino驱动DS18x20代码
这个是Arduino驱动DS18x20源代码
所有资料51hei提供下载:
DS18x20_Temperature.zip (1.59 KB, 下载次数: 5)

单片机源程序如下:
  1. #include <OneWire.h>

  3. // OneWire DS18S20, DS18B20, DS1822 Temperature Example
  4. //
  5. //
  6. // The DallasTemperature library can do all this work for you!

  8. OneWire  ds(10);  // on pin 10 (a 4.7K resistor is necessary)

  10. void setup(void) {
  11.   Serial.begin(9600);
  12. }

  14. void loop(void) {
  15.   byte i;
  16.   byte present = 0;
  17.   byte type_s;
  18.   byte data[12];
  19.   byte addr[8];
  20.   float celsius, fahrenheit;
  21.   
  22.   if ( !ds.search(addr)) {
  23.     Serial.println("No more addresses.");
  24.     Serial.println();
  25.     ds.reset_search();
  26.     delay(250);
  27.     return;
  28.   }
  29.   
  30.   Serial.print("ROM =");
  31.   for( i = 0; i < 8; i++) {
  32.     Serial.write(' ');
  33.     Serial.print(addr[i], HEX);
  34.   }

  36.   if (OneWire::crc8(addr, 7) != addr[7]) {
  37.       Serial.println("CRC is not valid!");
  38.       return;
  39.   }
  40.   Serial.println();

  42.   // the first ROM byte indicates which chip
  43.   switch (addr[0]) {
  44.     case 0x10:
  45.       Serial.println("  Chip = DS18S20");  // or old DS1820
  46.       type_s = 1;
  47.       break;
  48.     case 0x28:
  49.       Serial.println("  Chip = DS18B20");
  50.       type_s = 0;
  51.       break;
  52.     case 0x22:
  53.       Serial.println("  Chip = DS1822");
  54.       type_s = 0;
  55.       break;
  56.     default:
  57.       Serial.println("Device is not a DS18x20 family device.");
  58.       return;
  59.   }

  61.   ds.reset();
  62.   ds.select(addr);
  63.   ds.write(0x44, 1);        // start conversion, with parasite power on at the end
  64.   
  65.   delay(1000);     // maybe 750ms is enough, maybe not
  66.   // we might do a ds.depower() here, but the reset will take care of it.
  67.   
  68.   present = ds.reset();
  69.   ds.select(addr);   
  70.   ds.write(0xBE);         // Read Scratchpad

  72.   Serial.print("  Data = ");
  73.   Serial.print(present, HEX);
  74.   Serial.print(" ");
  75.   for ( i = 0; i < 9; i++) {           // we need 9 bytes
  76.     data[i] = ds.read();
  77.     Serial.print(data[i], HEX);
  78.     Serial.print(" ");
  79.   }
  80.   Serial.print(" CRC=");
  81.   Serial.print(OneWire::crc8(data, 8), HEX);
  82.   Serial.println();

  84.   // Convert the data to actual temperature
  85.   // because the result is a 16 bit signed integer, it should
  86.   // be stored to an "int16_t" type, which is always 16 bits
  87.   // even when compiled on a 32 bit processor.
  88.   int16_t raw = (data[1] << 8) | data[0];
  89.   if (type_s) {
  90.     raw = raw << 3; // 9 bit resolution default
  91.     if (data[7] == 0x10) {
  92.       // "count remain" gives full 12 bit resolution
  93.       raw = (raw & 0xFFF0) + 12 - data[6];
  94.     }
  95.   } else {
  96.     byte cfg = (data[4] & 0x60);
  97.     // at lower res, the low bits are undefined, so let's zero them
  98.     if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
  99.     else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
  100.     else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
  101.     //// default is 12 bit resolution, 750 ms conversion time
  102.   }
  103.   celsius = (float)raw / 16.0;
  104.   fahrenheit = celsius * 1.8 + 32.0;
  105.   Serial.print("  Temperature = ");
  106.   Serial.print(celsius);
  107.   Serial.print(" Celsius, ");
  108.   Serial.print(fahrenheit);
  109.   Serial.println(" Fahrenheit");
  110. }
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