标题: Arduino单总线多路18b20测温源码 [打印本页]
作者: genhao2    时间: 2018-9-28 09:24
标题: Arduino单总线多路18b20测温源码
Arduino多路18b20测温，使用单总线协议，优点是只占一个io口，且测温路数可以任意设定。

源程序如下:
  1. #include <OneWire.h>
  2. #include <DallasTemperature.h>

  4. // Data wire is plugged into port 2 on the Arduino
  5. #define ONE_WIRE_BUS 2
  6. #define TEMPERATURE_PRECISION 12

  8. // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
  9. OneWire oneWire(ONE_WIRE_BUS);

  11. // Pass our oneWire reference to Dallas Temperature.
  12. DallasTemperature sensors(&oneWire);

  14. int numberOfDevices; // Number of temperature devices found

  16. DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address

  18. void setup(void)
  19. {
  20.   // start serial port
  21.   Serial.begin(9600);
  22.   Serial.println("Dallas Temperature IC Control Library Demo");

  24.   // Start up the library
  25.   sensors.begin();
  26.   
  27.   // Grab a count of devices on the wire
  28.   numberOfDevices = sensors.getDeviceCount();
  29.   
  30.   // locate devices on the bus
  31.   Serial.print("Locating devices...");
  32.   
  33.   Serial.print("Found ");
  34.   Serial.print(numberOfDevices, DEC);
  35.   Serial.println(" devices.");

  37.   // report parasite power requirements
  38.   Serial.print("Parasite power is: ");
  39.   if (sensors.isParasitePowerMode()) Serial.println("ON");
  40.   else Serial.println("OFF");
  41.   
  42.   // Loop through each device, print out address
  43.   for(int i=0;i<numberOfDevices; i++)
  44.   {
  45.     // Search the wire for address
  46.     if(sensors.getAddress(tempDeviceAddress, i))
  47.         {
  48.                 Serial.print("Found device ");
  49.                 Serial.print(i, DEC);
  50.                 Serial.print(" with address: ");
  51.                 printAddress(tempDeviceAddress);
  52.                 Serial.println();
  53.                
  54.                 Serial.print("Setting resolution to ");
  55.                 Serial.println(TEMPERATURE_PRECISION,DEC);
  56.                
  57.                 // set the resolution to 9 bit (Each Dallas/Maxim device is capable of several different resolutions)
  58.                 sensors.setResolution(tempDeviceAddress, TEMPERATURE_PRECISION);
  59.                
  60.                  Serial.print("Resolution actually set to: ");
  61.                 Serial.print(sensors.getResolution(tempDeviceAddress), DEC);
  62.                 Serial.println();
  63.         }else{
  64.                 Serial.print("Found ghost device at ");
  65.                 Serial.print(i, DEC);
  66.                 Serial.print(" but could not detect address. Check power and cabling");
  67.         }
  68.   }

  70. }

  72. // function to print the temperature for a device
  73. void printTemperature(DeviceAddress deviceAddress)
  74. {
  75.   // method 1 - slower
  76.   //Serial.print("Temp C: ");
  77.   //Serial.print(sensors.getTempC(deviceAddress));
  78.   //Serial.print(" Temp F: ");
  79.   //Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit

  81.   // method 2 - faster
  82.   float tempC = sensors.getTempC(deviceAddress);
  83.   Serial.print("Temp C: ");
  84.   Serial.print(tempC);
  85.   Serial.print(" Temp F: ");
  86.   Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
  87. }

  89. void loop(void)
  90. {
  91.   // call sensors.requestTemperatures() to issue a global temperature
  92.   // request to all devices on the bus
  93.   Serial.print("Requesting temperatures...");
  94.   sensors.requestTemperatures(); // Send the command to get temperatures
  95.   Serial.println("DONE");
  96.   
  97.   
  98.   // Loop through each device, print out temperature data
  99.   for(int i=0;i<numberOfDevices; i++)
  100.   {
  101.     // Search the wire for address
  102.     if(sensors.getAddress(tempDeviceAddress, i))
  103.         {
  104.                 // Output the device ID
  105.                 Serial.print("Temperature for device: ");
  106.                 Serial.println(i,DEC);
  107.                
  108.                 // It responds almost immediately. Let's print out the data
  109.                 printTemperature(tempDeviceAddress); // Use a simple function to print out the data
  110.         }
  111.         //else ghost device! Check your power requirements and cabling
  112.         
  113.   }
  114.   delay(10000);
  115.   Serial.println(":");
  116.   Serial.println(":");
  117.   Serial.println(":");
  118. }

  120. // function to print a device address
  121. void printAddress(DeviceAddress deviceAddress)
  122. {
  123.   for (uint8_t i = 0; i < 8; i++)
  124.   {
  125.     if (deviceAddress[i] < 16) Serial.print("0");
  126.     Serial.print(deviceAddress[i], HEX);
  127.   }
  128. }
复制代码

所有资料51hei提供下载:
18b20.zip (1.41 KB, 下载次数: 22)



作者: szzxl10    时间: 2018-9-29 14:39
谢谢分享



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