public static void main(String[] args) throws InterruptedException {
System.out.println("<--Pi4J--> GPIO Trigger Example ... started.");
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// provision gpio pin #02 as an input pin with its internal pull down resistor enabled
final GpioPinDigitalInput myButton =
gpio.provisionDigitalInputPin(RaspiPin.GPIO_02, PinPullResistance.PULL_DOWN);
System.out.println(" ... complete the GPIO #02 circuit and see the triggers take effect.");
// setup gpio pins #04, #05, #06 as an output pins and make sure they are all LOW at startup
GpioPinDigitalOutput myLed[] = {
gpio.provisionDigitalOutputPin(RaspiPin.GPIO_04, "LED #1", PinState.LOW),
gpio.provisionDigitalOutputPin(RaspiPin.GPIO_05, "LED #2", PinState.LOW),
gpio.provisionDigitalOutputPin(RaspiPin.GPIO_06, "LED #3", PinState.LOW)
};
// create a gpio control trigger on the input pin ; when the input goes HIGH, also set gpio pin
// #04 to HIGH
myButton.addTrigger(new GpioSetStateTrigger(PinState.HIGH, myLed[0], PinState.HIGH));
// create a gpio control trigger on the input pin ; when the input goes LOW, also set gpio pin
// #04 to LOW
myButton.addTrigger(new GpioSetStateTrigger(PinState.LOW, myLed[0], PinState.LOW));
// create a gpio synchronization trigger on the input pin; when the input changes, also set gpio
// pin #05 to same state
myButton.addTrigger(new GpioSyncStateTrigger(myLed[1]));
// create a gpio pulse trigger on the input pin; when the input goes HIGH, also pulse gpio pin
// #06 to the HIGH state for 1 second
myButton.addTrigger(new GpioPulseStateTrigger(PinState.HIGH, myLed[2], 1000));
// create a gpio callback trigger on gpio pin#4; when #4 changes state, perform a callback
// invocation on the user defined 'Callable' class instance
myButton.addTrigger(
new GpioCallbackTrigger(
new Callable<Void>() {
public Void call() throws Exception {
System.out.println(" --> GPIO TRIGGER CALLBACK RECEIVED ");
return null;
}
}));
// keep program running until user aborts (CTRL-C)
for (; ; ) {
Thread.sleep(500);
}
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
// gpio.shutdown(); <--- implement this method call if you wish to terminate the Pi4J GPIO
// controller
}
@Before
public void setup() {
// create a mock gpio provider and controller
provider = MockGpioFactory.getMockProvider();
gpio = MockGpioFactory.getInstance();
// provision pins for testing
inputPin = gpio.provisionDigitalInputPin(MockPin.DIGITAL_INPUT_PIN, "digitalInputPin");
outputPin = gpio.provisionDigitalOutputPin(MockPin.DIGITAL_OUTPUT_PIN, "digitalOutputPin");
// create triggers
triggerHigh = new GpioSetStateTrigger(PinState.HIGH, outputPin, PinState.HIGH);
triggerLow = new GpioSetStateTrigger(PinState.LOW, outputPin, PinState.LOW);
// add triggers to input pin
inputPin.addTrigger(triggerHigh);
inputPin.addTrigger(triggerLow);
}
@BeforeClass
public static void setup() {
// create a mock gpio provider and controller
provider = MockGpioFactory.getMockProvider();
gpio = MockGpioFactory.getInstance();
// provision pins for testing
inputPin = gpio.provisionDigitalInputPin(MockPin.DIGITAL_INPUT_PIN, "digitalInputPin");
// create trigger
trigger =
new GpioCallbackTrigger(
new Callable<Void>() {
@Override
public Void call() throws Exception {
callbackCounter++;
return null;
}
});
// add trigger to input pin
inputPin.addTrigger(trigger);
}
public static void main(String[] args) throws InterruptedException {
// START SNIPPET: usage-create-controller-snippet
// create gpio controller instance
final GpioController gpio = GpioFactory.getInstance();
// END SNIPPET: usage-create-controller-snippet
// START SNIPPET: usage-provision-input-pin-snippet
// provision gpio pin #02 as an input pin with its internal pull down resistor enabled
// (configure pin edge to both rising and falling to get notified for HIGH and LOW state
// changes)
GpioPinDigitalInput myButton =
gpio.provisionDigitalInputPin(
RaspiPin.GPIO_02, // PIN NUMBER
"MyButton", // PIN FRIENDLY NAME (optional)
PinPullResistance.PULL_DOWN); // PIN RESISTANCE (optional)
// END SNIPPET: usage-provision-input-pin-snippet
// START SNIPPET: usage-provision-output-pin-snippet
// provision gpio pins #04 as an output pin and make sure is is set to LOW at startup
GpioPinDigitalOutput myLed =
gpio.provisionDigitalOutputPin(
RaspiPin.GPIO_04, // PIN NUMBER
"My LED", // PIN FRIENDLY NAME (optional)
PinState.LOW); // PIN STARTUP STATE (optional)
// END SNIPPET: usage-provision-output-pin-snippet
// START SNIPPET: usage-shutdown-pin-snippet
// configure the pin shutdown behavior; these settings will be
// automatically applied to the pin when the application is terminated
// ensure that the LED is turned OFF when the application is shutdown
myLed.setShutdownOptions(true, PinState.LOW, PinPullResistance.OFF);
// END SNIPPET: usage-shutdown-pin-snippet
// START SNIPPET: usage-control-pin-snippet
// explicitly set a state on the pin object
myLed.setState(PinState.HIGH);
// use convenience wrapper method to set state on the pin object
myLed.low();
myLed.high();
// use toggle method to apply inverse state on the pin object
myLed.toggle();
// use pulse method to set the pin to the HIGH state for
// an explicit length of time in milliseconds
myLed.pulse(1000);
// END SNIPPET: usage-control-pin-snippet
// START SNIPPET: usage-read-pin-snippet
// get explicit state enumeration for the GPIO pin associated with the button
PinState myButtonState = myButton.getState();
// use convenience wrapper method to interrogate the button state
boolean buttonPressed = myButton.isHigh();
// END SNIPPET: usage-read-pin-snippet
// START SNIPPET: usage-register-listener-snippet
// create and register gpio pin listener
myButton.addListener(new GpioUsageExampleListener());
// END SNIPPET: usage-register-listener-snippet
// START SNIPPET: usage-trigger-snippet
// create a gpio synchronization trigger on the input pin
// when the input state changes, also set LED controlling gpio pin to same state
myButton.addTrigger(new GpioSyncStateTrigger(myLed));
// END SNIPPET: usage-trigger-snippet
// keep program running until user aborts (CTRL-C)
while (true) {
Thread.sleep(500);
}
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
// gpio.shutdown(); <--- implement this method call if you wish to terminate the Pi4J GPIO
// controller
}
/**
* @param args --none-
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
// create Pi4J console wrapper/helper
// (This is a utility class to abstract some of the boilerplate code)
final Console console = new Console();
// print program title/header
console.title("<-- The Pi4J Project -->", "IFTTT Maker Channel Trigger Example");
// allow for user to exit program using CTRL-C
console.promptForExit();
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// provision gpio pin as an input pin
final GpioPinDigitalInput input =
gpio.provisionDigitalInputPin(RaspiPin.GPIO_00, "MyInputPin", PinPullResistance.PULL_DOWN);
// provide 500ms of pin debounce protection
input.setDebounce(500);
;
// -----------------------------------------
// Add the IFTTT Maker Channel Trigger
// (This is where the magic happens)
// -----------------------------------------
input.addTrigger(
new IFTTTMakerChannelTrigger(
IFTTT_MAKER_CHANNEL_API_KEY, // <<-- PROVIDE YOUR ACCOUNT SPECIFIC IFTTT MAKER CHANNEL
// API KEY
IFTTT_MAKER_CHANNEL_EVENT_NAME, // <<-- PROVIDE THE IFTTT MAKER CHANNEL EVENT NAME
// (defined in your IFTTTT recipe)
PinState.HIGH, // <<-- OPTIONALLY DEFINE A SPECIFIC STATE TO TRIGGER ON
// OPTIONALLY REGISTER A TRIGGER CALLBACK LISTENER
// (Note: this callback parameter is not required for basic functionality)
new IFTTTMakerChannelTriggerListener() {
@Override
public boolean onTriggered(IFTTTMakerChannelTriggerEvent event) {
// The IFTTT Maker Channel API accepts three value parameters (value1, value2, and
// value3)
// By default, Pi4J applies the following values to each:
//
// "value1" = {pin-name}
// "value2" = {pin-state-value} (as an Integer; 0==LOW, 1==HIGH)
// "value3" = {json-payload} Example:
// {
// "pin": {
// "name": "MyInputPin",
// "address": "0",
// "provider": "RaspberryPi GPIO Provider",
// "mode": "input",
// "direction": "IN",
// "pull": "down"
// },
// "state": {
// "name": "HIGH",
// "value": "1",
// "is-high": "true",
// "is-low": "false"
// },
// "timestamp": "2016-04-15T17:32:49.666-0400"
// }
//
// However, you can override any of these defaults in your callback listener by
// applying new string values via the 'setValueX()' methods on the event object.
//
// Example:
if (event.getValue2().equals("1")) {
event.setValue2("ON");
} else {
event.setValue2("OFF");
}
// display event trigger details on screen
console.println(" --> IFTTT MAKER CHANNEL EVENT TRIGGER");
console.println(" - GPIO PIN : " + event.getPin());
console.println(" - PIN STATE : " + event.getState());
console.println(" - IFTTT EVENT NAME : " + event.getEventName());
console.println(" - IFTTT EVENT VALUE 1 : " + event.getValue1());
console.println(" - IFTTT EVENT VALUE 2 : " + event.getValue2());
console.println(" - IFTTT EVENT VALUE 3 : " + event.getValue3());
console.emptyLine();
// MAKE SURE TO RETURN 'true' TO CONTINUE WITH THE IFTTT MAKER CHANNEL API CALL
// (you can optionally return 'false' if you want to abort the IFTTT API call)
return true;
}
}));
// set shutdown state for this pin: unexport the pin
input.setShutdownOptions(true);
// prompt user that we are ready
console.println(
"Successfully provisioned ["
+ input
+ "] with PULL resistance = ["
+ input.getPullResistance()
+ "]");
console.emptyLine();
// wait for user to exit by pressing CTRL-C
console.waitForExit();
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
gpio.shutdown();
}
public static void main(String args[]) throws InterruptedException {
System.out.println("<--Pi4J--> GPIO Listen Example ... started.");
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// provision gpio pin #02 as an input pin with its internal pull down resistor enabled
final GpioPinDigitalInput myButton =
gpio.provisionDigitalInputPin(RaspiPin.GPIO_02, PinPullResistance.PULL_DOWN);
// create custom Olimex GPIO provider
final OlimexAVRIOGpioProvider olimexProvider =
new OlimexAVRIOGpioProvider(Serial.DEFAULT_COM_PORT);
// provision gpio input pin #01 from Olimex
final GpioPinDigitalInput myInput =
gpio.provisionDigitalInputPin(olimexProvider, OlimexAVRIOPin.IN_01);
// create gpio pin listener
GpioPinListenerDigital listener =
new GpioPinListenerDigital() {
@Override
public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
// display pin state on console
System.out.println(
" --> GPIO PIN STATE CHANGE: " + event.getPin() + " = " + event.getState());
}
};
// register gpio pin listener for each input pin
myButton.addListener(listener);
myInput.addListener(listener);
// setup gpio pins #04, #05, #06 as an output pins and make sure they are all LOW at startup
GpioPinDigitalOutput myRelays[] = {
gpio.provisionDigitalOutputPin(
olimexProvider, OlimexAVRIOPin.RELAY_01, "RELAY #1", PinState.LOW),
gpio.provisionDigitalOutputPin(
olimexProvider, OlimexAVRIOPin.RELAY_02, "RELAY #2", PinState.LOW),
gpio.provisionDigitalOutputPin(
olimexProvider, OlimexAVRIOPin.RELAY_03, "RELAY #3", PinState.LOW),
gpio.provisionDigitalOutputPin(
olimexProvider, OlimexAVRIOPin.RELAY_04, "RELAY #4", PinState.LOW)
};
// create a gpio control trigger on the input pin ; when the input goes HIGH, also set gpio pin
// #04 to HIGH
myButton.addTrigger(new GpioSetStateTrigger(PinState.HIGH, myRelays[0], PinState.HIGH));
// create a gpio control trigger on the input pin ; when the input goes LOW, also set gpio pin
// #04 to LOW
myButton.addTrigger(new GpioSetStateTrigger(PinState.LOW, myRelays[0], PinState.LOW));
// create a gpio synchronization trigger on the input pin; when the input changes, also set gpio
// pin #05 to same state
myButton.addTrigger(new GpioSyncStateTrigger(myRelays[1]));
// create a gpio synchronization trigger on the input pin; when the input changes, also set gpio
// pin #05 to same state
myButton.addTrigger(new GpioSyncStateTrigger(myRelays[2]));
// create a gpio pulse trigger on the input pin; when the input goes HIGH, also pulse gpio pin
// #06 to the HIGH state for 1 second
myButton.addTrigger(new GpioPulseStateTrigger(PinState.HIGH, myRelays[3], 1000));
System.out.println(
" ... complete the GPIO #02 circuit and see the listener feedback here in the console.");
// keep program running until user aborts (CTRL-C)
// or we reach 60 seconds
for (int seconds = 0; seconds < 60; seconds++) {
Thread.sleep(1000);
}
System.out.println(" ... exiting program.");
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
gpio.shutdown();
}