108 lines
6.8 KiB
C++
108 lines
6.8 KiB
C++
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////////////////////////////////////////////////////////////
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// //
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// HomeSpan: A HomeKit implementation for the ESP32 //
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// ------------------------------------------------ //
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// //
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// Example 15: Real PushButtons //
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// * manually controlling a Dimmable LED //
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// //
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// //
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////////////////////////////////////////////////////////////
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#include "HomeSpan.h"
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#include "DEV_LED.h"
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#include "DEV_Identify.h"
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void setup() {
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// In Example 14 we saw how to emulate a PushButton tile within HomeKit by automatically resetting a Characteristic so that
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// it "turns off" after a short period of time. However, sometimes we want to be able to physically control a device with actual
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// PushButtons (or momentary switches) that trigger an action, such as turning on a light or fan, or opening a garage door.
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// Additionally, we want HomeKit to reflect any changes in the device as a result of such manual actions - HomeKit should know
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// when the light has been turned on or off manually.
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// One way to accomplish would be via custom code added to the loop() method of your derived Service that monitors the button,
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// checks when it is pressed, debounces button noise, performs some actions when pressed, and informs HomeKit of the actions with
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// the setVal() method. Or you can use HomeSpan's built-in SpanButton() object.
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// SpanButton() is a Service-level object, meaning it attaches itself to the last Service you define. Typically you would instantiate
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// one of more SpanButton() objects directly inside the constructor for your derived Service.
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// SpanButton() supports two types of a triggers: a SHORT (momentary) button press, and a LONG (extended) button press. SpanButton()
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// takes 3 arguments, in the following order:
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//
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// * the pin number to which the PushButton is attached (required)
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// * the length of time (in milliseconds) the button needs to be pushed to be considered a LONG press (optional; default=2000 ms)
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// * the length of time (in milliseconds) the button needs to be pushed to be considered a SHORT press (optional; default=5 ms)
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// When SpanButton() is instantiated, it sets the specified pin on the ESP32 to be an INPUT with PULL-UP, meaning that the pin will
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// normally return a value of HIGH when read. Your actual PushButton should be connected so that this pin is GROUNDED when the button
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// is pressed.
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// HomeSpan automatically polls all pins with associated SpanButton() objects and checks for LOW values, indicating the button was
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// pressed, but not yet released. It then starts a timer and waits for the button to be released.
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// NOTE! TRIGGERS DO NOT OCCUR UNTIL THE BUTTON IS RELEASED - IF YOU HOLD DOWN A BUTTON INDEFINITELY, NOTHING HAPPENS.
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// The length of the press needed to trigger either a SHORT or LONG action is specified by the optional arguments. Since most buttons
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// create spurious noise when pressed (and then again when released), the default time to trigger a SHORT press is 5ms. It's fine to change
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// this to a longer value, but a shorter value is not recommended as this may allow spurious triggers unless you debounce your switch
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// with hardware.
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// To use SpanButton() within a derived Service you need to implement a button() method. Similar to the loop() method, your button()
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// method will typically contain some combination of getVal() functions and setVal() functions, along with code that performs some set
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// of actions on the physical device (seting pins high or low, turning on fans, etc). However, in contrast to the loop() method, which
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// is called by HomeSpan every polling cycle, HomeSpan only calls the button() method when a button attached to the Service registers a
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// SHORT or LONG press.
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// Also in contrast with the loop method, the button() method takes two arguments, an int and a boolean, and should defined as follows:
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//
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// void button(int pin, boolean isLong)
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//
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// where "pin" is the pin number of the PushButton that was triggered, and "isLong" is a flag indicating whether SpanButton() detected a
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// LONG press (isLong=true) or a SHORT press (isLong=false). Of course you can replace the variables "pin" and "isLong" with your own
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// names. The only requirement is the defintiion conform to the "void button(int, boolean)" signature. When HomeSpan first starts up it checks
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// all Services containing one or more SpanButton() instances to ensure you've implemented your own button(int, boolean) method. If not,
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// HomeSpan will print a warning message on the Serial Monitor. Nothing bad happens if you instantiate a SpanButton() but forget to create
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// the button() method, or you create it with the wrong parameters. Buy nothing good happens either - button presses are just ignored.
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//
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// C++ Note: For an extra check, you can also place the the contextual keyword "override" after your method definition as such:
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//
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// void button(int buttonPin, boolean longPress) override {...your code...}
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//
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// Doing so allows the compiler to check that you are indeed over-riding the base class button() method and not inadvertently creating a new
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// button() method with an incorrect signature that will never be called by SpanButton(). In fact, you could add "override" to the definition
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// of your update() and loop() methods as well, since these are always supposed to over-ride the base-class method.
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// To demonstrate how PushButtons works in practice, we will implement a Dimmable LED starting with the same LED code use in Example 11,
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// but with 3 SpanButton() objects performing different functions that showcase the different parameters. As usual, all the code is implemented
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// in DEV_LED.h, with NEW! comments highlighting changes from Example 11. You'll also notice that we've extended the constructor for this
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// version of our derived Dimmable LED Service to include the pin numbers for each of our buttons. See DEV_LED.h for details.
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Serial.begin(115200);
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homeSpan.setLogLevel(1);
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homeSpan.begin(Category::Bridges,"HomeSpan Bridge");
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new SpanAccessory();
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new DEV_Identify("Bridge #1","HomeSpan","123-ABC","HS Bridge","0.9",3);
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new Service::HAPProtocolInformation();
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new Characteristic::Version("1.1.0");
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new SpanAccessory();
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new DEV_Identify("PushButton LED","HomeSpan","123-ABC","20mA LED","0.9",0);
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new DEV_DimmableLED(0,17,23,5,18); // NEW! added three extra arguments to specific the pin numbers for three SpanButtons() - see DEV_LED.h
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} // end of setup()
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//////////////////////////////////////
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void loop(){
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homeSpan.poll();
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} // end of loop()
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