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ESP32/12-ServiceLoops/DEV_Sensors.h
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117
ESP32/12-ServiceLoops/DEV_Sensors.h
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////////////////////////////////////
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// DEVICE-SPECIFIC LED SERVICES //
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////////////////////////////////////
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struct DEV_TempSensor : Service::TemperatureSensor { // A standalone Temperature sensor
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SpanCharacteristic *temp; // reference to the Current Temperature Characteristic
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DEV_TempSensor() : Service::TemperatureSensor(){ // constructor() method
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// First we instantiate the main Characteristic for a Temperature Sensor, namely the Current Temperature, and set its initial value
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// to 20 degrees. For a real sensor, we would take a reading and initialize it to that value instead. NOTE: HomeKit uses
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// Celsius for all temperature settings. HomeKit will DISPLAY temperatures in the HomeKit app according to the settings on your iPhone.
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// Though the HAP documentation includes a Characteristic that appears to allow the device to over-ride this setting by specifying a display
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// of Celsius or Fahrenheit for each Service, it does not appear to work as advertised.
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temp=new Characteristic::CurrentTemperature(-10.0); // instantiate the Current Temperature Characteristic
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temp->setRange(-50,100); // expand the range from the HAP default of 0-100 to -50 to 100 to allow for negative temperatures
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Serial.print("Configuring Temperature Sensor"); // initialization message
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Serial.print("\n");
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} // end constructor
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// Next we create the loop() method. This method take no arguments and returns no values. In order to simulate a temperature change
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// from an actual sensor we will read the current value of the temp Characteristic using the getVal() function, with <float> as the
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// template parameter; add 0.5 degrees Celsius; and then store the result in a float variable named "temperature." This will simulate
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// an increment of 0.5 degrees Celsius (a little less than 1 degree F). We will cap the temperature to 35.0 degrees C, after which
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// it resets to 10.0 and starts over. Most importantly, we will do this once every 5 seconds by checking the elapsed time since the
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// previous modification using timeVal().
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// All of the action happens in the setVal() line where we set the value of the temp Characteristic to the new value of temperature.
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// This tells HomeKit to send an Event Notification message to all available Controllers making them aware of the new temperature.
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// Note that setVal() is NOT a template function and does not require you to specify <float> as a template parameter. This is because
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// setVal() can determine the type from the argument you specify. If there is any chance of ambiguity, you can always specifically
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// cast the argument such: setVal((float)temperature).
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void loop(){
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if(temp->timeVal()>5000){ // check time elapsed since last update and proceed only if greater than 5 seconds
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float temperature=temp->getVal<float>()+0.5; // "simulate" a half-degree temperature change...
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if(temperature>35.0) // ...but cap the maximum at 35C before starting over at -30C
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temperature=-30.0;
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temp->setVal(temperature); // set the new temperature; this generates an Event Notification and also resets the elapsed time
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LOG1("Temperature Update: ");
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LOG1(temperature*9/5+32);
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LOG1("\n");
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}
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} // loop
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};
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//////////////////////////////////
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struct DEV_AirQualitySensor : Service::AirQualitySensor { // A standalone Air Quality sensor
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// An Air Quality Sensor is similar to a Temperature Sensor except that it supports a wide variety of measurements.
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// We will use three of them. The first is required, the second two are optional.
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SpanCharacteristic *airQuality; // reference to the Air Quality Characteristic, which is an integer from 0 to 5
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SpanCharacteristic *o3Density; // reference to the Ozone Density Characteristic, which is a float from 0 to 1000
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SpanCharacteristic *no2Density; // reference to the Nitrogen Dioxide Characteristic, which is a float from 0 to 1000
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DEV_AirQualitySensor() : Service::AirQualitySensor(){ // constructor() method
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airQuality=new Characteristic::AirQuality(1); // instantiate the Air Quality Characteristic and set initial value to 1
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o3Density=new Characteristic::OzoneDensity(300.0); // instantiate the Ozone Density Characteristic and set initial value to 300.0
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no2Density=new Characteristic::NitrogenDioxideDensity(700.0); // instantiate the Nitrogen Dioxide Density Characteristic and set initial value to 700.0
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Serial.print("Configuring Air Quality Sensor"); // initialization message
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Serial.print("\n");
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} // end constructor
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void loop(){
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// Note we are NOT updating the Nitrogen Dioxide Density Characteristic. This should therefore remain steady at its initial value of 700.0
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if(airQuality->timeVal()>5000) // modify the Air Quality Characteristic every 5 seconds
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airQuality->setVal((airQuality->getVal()+1)%6); // simulate a change in Air Quality by incrementing the current value by one, and keeping in range 0-5
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if(o3Density->timeVal()>10000) // modify the Ozone Density Characteristic value every 10 seconds
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o3Density->setVal((double)random(200,500)); // simulate a change with a random value between 200 and 499. Note use of (double) cast since random() returns an integer
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} // loop
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};
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//////////////////////////////////
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// What you should see in your HomeKit Application
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// -----------------------------------------------
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// If you load the above example, your HomeKit App should display two new tiles: one labeled "Temp Sensor" and the other labeled "Air Quality".
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// The Temp Sensor tile should indicate a temperature in the range of 10C to 35C (50F to 95F), which automatically increments and updates 0.5C every 5 seconds.
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// The Air Quality tile should cycle through "quality" states once every 10 seconds. States are displayed in HomeKit as "Unknown", "Excellent", "Good", "Fair",
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// "Inferior" and "Poor".
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// Note that HomeKit only displays the values of a subset of Characteristics within the tile itself. In the case of an Air Quality Sensor,
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// only the quality state of the Air Quality is displayed. To see the values of other Characteristics, such as Ozone Density and Nitrogen Dioxide Density, you need to click
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// on the tile, AND open the settings screen (it would be nicer if HomeKit displayed these values on the control screen instead of making you open the settings screen).
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// On the setting screen you should see the values of all three of the Characteristics we instantiated: Air Quality, Nitrogen Dioxide Density, and Ozone Density.
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// Both the Air Quality and Ozone Density should change every 10 seconds. The Nitrogen Dioxide Density should remain steady at the initial value of 700.0, since we
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// never use setVal() to update this Characteristic.
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// If you run HomeSpan at a VERBOSITY level of 2 (as specified in the library's Settings.h file), you can see that under the hood HomeSpan is sending Event Notification
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// messages to all registered controllers every 5 seconds for the Temp Sensor, and every 5 and 10 seconds for the Air Quality Sensor. If you look carefully you'll see that
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// the Event Notification message for the Air Quality Sensor only include two values - one for the Air Quality state and one for the Ozone Density. HomeSpan is NOT
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// sending a value for the Nitrogen Dioxide Density Characteristic since it has not been changed with a setVal() function.
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// FINAL NOTE: The number of decimals HomeKit displays for temperature in the HomeKit app is independent of the step size of the value itself. This seems to be
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// hardcoded by HomeKit: for Fahrenheit a Temperature Sensor tile shows no decimals and ROUNDS to the nearest whole degree (e.g. 72, 73, 74 degrees); for Celsius
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// the tile allows for half-degree resolution and ROUNDS accordingly (e.g. 22.7 is displayed as 22.5 and 22.8 is displayed as 23.0).
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