145 lines
4.8 KiB
Plaintext
145 lines
4.8 KiB
Plaintext
// Include the libraries we need
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#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
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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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// arrays to hold device addresses
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DeviceAddress insideThermometer, outsideThermometer;
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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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// 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(sensors.getDeviceCount(), 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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// Assign address manually. The addresses below will beed to be changed
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// to valid device addresses on your bus. Device address can be retrieved
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// by using either oneWire.search(deviceAddress) or individually via
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// sensors.getAddress(deviceAddress, index)
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//insideThermometer = { 0x28, 0x1D, 0x39, 0x31, 0x2, 0x0, 0x0, 0xF0 };
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//outsideThermometer = { 0x28, 0x3F, 0x1C, 0x31, 0x2, 0x0, 0x0, 0x2 };
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// Search for devices on the bus and assign based on an index. Ideally,
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// you would do this to initially discover addresses on the bus and then
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// use those addresses and manually assign them (see above) once you know
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// the devices on your bus (and assuming they don't change).
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//
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// method 1: by index
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if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0");
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if (!sensors.getAddress(outsideThermometer, 1)) Serial.println("Unable to find address for Device 1");
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// method 2: search()
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// search() looks for the next device. Returns 1 if a new address has been
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// returned. A zero might mean that the bus is shorted, there are no devices,
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// or you have already retrieved all of them. It might be a good idea to
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// check the CRC to make sure you didn't get garbage. The order is
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// deterministic. You will always get the same devices in the same order
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//
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// Must be called before search()
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//oneWire.reset_search();
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// assigns the first address found to insideThermometer
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//if (!oneWire.search(insideThermometer)) Serial.println("Unable to find address for insideThermometer");
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// assigns the seconds address found to outsideThermometer
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//if (!oneWire.search(outsideThermometer)) Serial.println("Unable to find address for outsideThermometer");
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// show the addresses we found on the bus
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Serial.print("Device 0 Address: ");
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printAddress(insideThermometer);
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Serial.println();
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Serial.print("Device 1 Address: ");
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printAddress(outsideThermometer);
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Serial.println();
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// set the resolution to 9 bit per device
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sensors.setResolution(insideThermometer, TEMPERATURE_PRECISION);
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sensors.setResolution(outsideThermometer, TEMPERATURE_PRECISION);
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Serial.print("Device 0 Resolution: ");
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Serial.print(sensors.getResolution(insideThermometer), DEC);
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Serial.println();
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Serial.print("Device 1 Resolution: ");
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Serial.print(sensors.getResolution(outsideThermometer), DEC);
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Serial.println();
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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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// zero pad the address if necessary
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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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// function to print the temperature for a device
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void printTemperature(DeviceAddress deviceAddress)
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{
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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.print(DallasTemperature::toFahrenheit(tempC));
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}
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// function to print a device's resolution
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void printResolution(DeviceAddress deviceAddress)
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{
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Serial.print("Resolution: ");
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Serial.print(sensors.getResolution(deviceAddress));
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Serial.println();
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}
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// main function to print information about a device
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void printData(DeviceAddress deviceAddress)
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{
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Serial.print("Device Address: ");
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printAddress(deviceAddress);
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Serial.print(" ");
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printTemperature(deviceAddress);
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Serial.println();
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}
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/*
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* Main function, calls the temperatures in a loop.
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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();
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Serial.println("DONE");
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// print the device information
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printData(insideThermometer);
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printData(outsideThermometer);
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}
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