81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
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//
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// Sample of using Async reading of Dallas Temperature Sensors
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//
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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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// 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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DeviceAddress tempDeviceAddress;
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int resolution = 12;
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unsigned long lastTempRequest = 0;
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int delayInMillis = 0;
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float temperature = 0.0;
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int idle = 0;
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//
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// SETUP
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//
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void setup(void)
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{
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Serial.begin(115200);
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Serial.println("Dallas Temperature Control Library - Async Demo");
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Serial.print("Library Version: ");
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Serial.println(DALLASTEMPLIBVERSION);
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Serial.println("\n");
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sensors.begin();
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sensors.getAddress(tempDeviceAddress, 0);
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sensors.setResolution(tempDeviceAddress, resolution);
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sensors.setWaitForConversion(false);
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sensors.requestTemperatures();
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delayInMillis = 750 / (1 << (12 - resolution));
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lastTempRequest = millis();
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pinMode(13, OUTPUT);
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}
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void loop(void)
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{
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if (millis() - lastTempRequest >= delayInMillis) // waited long enough??
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{
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digitalWrite(13, LOW);
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Serial.print(" Temperature: ");
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temperature = sensors.getTempCByIndex(0);
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Serial.println(temperature, resolution - 8);
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Serial.print(" Resolution: ");
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Serial.println(resolution);
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Serial.print("Idle counter: ");
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Serial.println(idle);
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Serial.println();
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idle = 0;
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// immediately after fetching the temperature we request a new sample
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// in the async modus
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// for the demo we let the resolution change to show differences
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resolution++;
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if (resolution > 12) resolution = 9;
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sensors.setResolution(tempDeviceAddress, resolution);
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sensors.requestTemperatures();
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delayInMillis = 750 / (1 << (12 - resolution));
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lastTempRequest = millis();
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}
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digitalWrite(13, HIGH);
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// we can do usefull things here
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// for the demo we just count the idle time in millis
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delay(1);
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idle++;
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}
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