Arduino單總線多路18b20測溫源碼

ID:398397 · 發表于 2018-9-28 09:24

Arduino多路18b20測溫，使用單總線協議，優點是只占一個io口，且測溫路數可以任意設定。

源程序如下:

#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
#define TEMPERATURE_PRECISION 12
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
int numberOfDevices; // Number of temperature devices found
DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address
void setup(void)
{
// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
sensors.begin();
// Grab a count of devices on the wire
numberOfDevices = sensors.getDeviceCount();
// locate devices on the bus
Serial.print("Locating devices...");
Serial.print("Found ");
Serial.print(numberOfDevices, DEC);
Serial.println(" devices.");
// report parasite power requirements
Serial.print("Parasite power is: ");
if (sensors.isParasitePowerMode()) Serial.println("ON");
else Serial.println("OFF");
// Loop through each device, print out address
for(int i=0;i<numberOfDevices; i++)
{
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i))
{
Serial.print("Found device ");
Serial.print(i, DEC);
Serial.print(" with address: ");
printAddress(tempDeviceAddress);
Serial.println();
Serial.print("Setting resolution to ");
Serial.println(TEMPERATURE_PRECISION,DEC);
// set the resolution to 9 bit (Each Dallas/Maxim device is capable of several different resolutions)
sensors.setResolution(tempDeviceAddress, TEMPERATURE_PRECISION);
Serial.print("Resolution actually set to: ");
Serial.print(sensors.getResolution(tempDeviceAddress), DEC);
Serial.println();
}else{
Serial.print("Found ghost device at ");
Serial.print(i, DEC);
Serial.print(" but could not detect address. Check power and cabling");
}
}
}
// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
// method 1 - slower
//Serial.print("Temp C: ");
//Serial.print(sensors.getTempC(deviceAddress));
//Serial.print(" Temp F: ");
//Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit
// method 2 - faster
float tempC = sensors.getTempC(deviceAddress);
Serial.print("Temp C: ");
Serial.print(tempC);
Serial.print(" Temp F: ");
Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
}
void loop(void)
{
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
Serial.print("Requesting temperatures...");
sensors.requestTemperatures(); // Send the command to get temperatures
Serial.println("DONE");
// Loop through each device, print out temperature data
for(int i=0;i<numberOfDevices; i++)
{
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i))
{
// Output the device ID
Serial.print("Temperature for device: ");
Serial.println(i,DEC);
// It responds almost immediately. Let's print out the data
printTemperature(tempDeviceAddress); // Use a simple function to print out the data
}
//else ghost device! Check your power requirements and cabling
}
delay(10000);
Serial.println(":");
Serial.println(":");
Serial.println(":");
}
// function to print a device address
void printAddress(DeviceAddress deviceAddress)
{
for (uint8_t i = 0; i < 8; i++)
{
if (deviceAddress[i] < 16) Serial.print("0");
Serial.print(deviceAddress[i], HEX);
}
}

復制代碼

所有資料51hei提供下載:

18b20.zip (1.41 KB, 下載次數: 22)

ID:243394 · 發表于 2018-9-29 14:39

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Arduino單總線多路18b20測溫源碼