71 lines
3.4 KiB
C
71 lines
3.4 KiB
C
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////////////////////////////////////
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// DEVICE-SPECIFIC LED SERVICES //
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////////////////////////////////////
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#include "extras/PwmPin.h" // NEW! Include this HomeSpan "extra" to create LED-compatible PWM signals on one or more pins
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struct DEV_LED : Service::LightBulb { // ON/OFF LED
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int ledPin; // pin number defined for this LED
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SpanCharacteristic *power; // reference to the On Characteristic
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DEV_LED(int ledPin) : Service::LightBulb(){ // constructor() method
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power=new Characteristic::On();
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this->ledPin=ledPin;
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pinMode(ledPin,OUTPUT);
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} // end constructor
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boolean update(){ // update() method
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digitalWrite(ledPin,power->getNewVal());
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return(true); // return true
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} // update
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};
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//////////////////////////////////
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// Here's the new code defining DEV_DimmableLED - changes from above are noted in the comments
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struct DEV_DimmableLED : Service::LightBulb { // Dimmable LED
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PwmPin *pwmPin; // NEW! Create reference to PWM Pin instantiated below
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int channel; // NEW! Store the PWM channel used for this LED (should be unique for each LED)
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SpanCharacteristic *power; // reference to the On Characteristic
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SpanCharacteristic *level; // NEW! Create a reference to the Brightness Characteristic instantiated below
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DEV_DimmableLED(int channel, int ledPin) : Service::LightBulb(){ // constructor() method
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power=new Characteristic::On();
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level=new Characteristic::Brightness(50); // NEW! Instantiate the Brightness Characteristic with an initial value of 50% (same as we did in Example 4)
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new SpanRange(5,100,1); // NEW! This sets the range of the Brightness to be from a min of 5%, to a max of 100%, in steps of 1% (different from Example 4 values)
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this->channel=channel; // NEW! Save the channel number (from 0-15)
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this->pwmPin=new PwmPin(channel, ledPin); // NEW! Configures the PWM channel and attach the specified ledPin. pinMode() does NOT need to be called.
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} // end constructor
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boolean update(){ // update() method
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// Here we set the duty cycle (brightness) of the LED by callng pwmPin with the appropriate channel.
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// The second argument should be a number from 0-100 (representing %brightness). HomeKit sets the on/off
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// status of the LED ("power") separately from the brightness of the LED ("level"). This means HomeKit can
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// request the LED be turned off, but retain the brightness level so that it does not need to be resent if
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// the LED is turned back on. Multiplying the newValue of the power Characteristic (as a boolean) with the
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// newValue of the Brightness Characteristic (as an int) is a short-hand way of creating the logic to
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// set the PWM level when the LED is off (always zero) or on (whatever the brightness level is).
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pwmPin->set(channel,power->getNewVal()*level->getNewVal());
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return(true); // return true
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} // update
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};
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//////////////////////////////////
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