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