arduino/libraries/DallasTemperature/examples/Alarm/Alarm.pde

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#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
// 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);
// arrays to hold device addresses
DeviceAddress insideThermometer, outsideThermometer;
void setup(void)
{
// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
sensors.begin();
// locate devices on the bus
Serial.print("Found ");
Serial.print(sensors.getDeviceCount(), DEC);
Serial.println(" devices.");
// search for devices on the bus and assign based on an index.
if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0");
if (!sensors.getAddress(outsideThermometer, 1)) Serial.println("Unable to find address for Device 1");
// show the addresses we found on the bus
Serial.print("Device 0 Address: ");
printAddress(insideThermometer);
Serial.println();
Serial.print("Device 0 Alarms: ");
printAlarms(insideThermometer);
Serial.println();
Serial.print("Device 1 Address: ");
printAddress(outsideThermometer);
Serial.println();
Serial.print("Device 1 Alarms: ");
printAlarms(outsideThermometer);
Serial.println();
Serial.println("Setting alarm temps...");
// alarm when temp is higher than 30C
sensors.setHighAlarmTemp(insideThermometer, 30);
// alarm when temp is lower than -10C
sensors.setLowAlarmTemp(insideThermometer, -10);
// alarm when temp is higher than 31C
sensors.setHighAlarmTemp(outsideThermometer, 31);
// alarn when temp is lower than 27C
sensors.setLowAlarmTemp(outsideThermometer, 27);
Serial.print("New Device 0 Alarms: ");
printAlarms(insideThermometer);
Serial.println();
Serial.print("New Device 1 Alarms: ");
printAlarms(outsideThermometer);
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);
}
}
// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
float tempC = sensors.getTempC(deviceAddress);
Serial.print("Temp C: ");
Serial.print(tempC);
Serial.print(" Temp F: ");
Serial.print(DallasTemperature::toFahrenheit(tempC));
}
void printAlarms(uint8_t deviceAddress[])
{
char temp;
temp = sensors.getHighAlarmTemp(deviceAddress);
Serial.print("High Alarm: ");
Serial.print(temp, DEC);
Serial.print("C/");
Serial.print(DallasTemperature::toFahrenheit(temp));
Serial.print("F | Low Alarm: ");
temp = sensors.getLowAlarmTemp(deviceAddress);
Serial.print(temp, DEC);
Serial.print("C/");
Serial.print(DallasTemperature::toFahrenheit(temp));
Serial.print("F");
}
// main function to print information about a device
void printData(DeviceAddress deviceAddress)
{
Serial.print("Device Address: ");
printAddress(deviceAddress);
Serial.print(" ");
printTemperature(deviceAddress);
Serial.println();
}
void checkAlarm(DeviceAddress deviceAddress)
{
if (sensors.hasAlarm(deviceAddress))
{
Serial.print("ALARM: ");
printData(deviceAddress);
}
}
void loop(void)
{
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
Serial.print("Requesting temperatures...");
sensors.requestTemperatures();
Serial.println("DONE");
// Method 1:
// check each address individually for an alarm condition
checkAlarm(insideThermometer);
checkAlarm(outsideThermometer);
/*
// Alternate method:
// Search the bus and iterate through addresses of devices with alarms
// space for the alarm device's address
DeviceAddress alarmAddr;
Serial.println("Searching for alarms...");
// resetAlarmSearch() must be called before calling alarmSearch()
sensors.resetAlarmSearch();
// alarmSearch() returns 0 when there are no devices with alarms
while (sensors.alarmSearch(alarmAddr))
{
Serial.print("ALARM: ");
printData(alarmAddr);
}
*/
}