API for the Grove LED. More...

Detailed Description

UPM module for the Grove LED (or other similar light-emitting diodes). An LED is a small lightbulb that emits light in response to a small current. The longer wire of an LED connects to the positive seat (anode); the shorter wire connects to the negative seat (cathode). The flat side of the bulb corresponds to the cathode, while the rounded side corresponds to the anode.

    // Create the Grove LED object using GPIO pin 2
    upm::GroveLed* led = new upm::GroveLed(2);
    // Print the name
    std::cout << led->name() << std::endl;
    // Turn the LED on and off 10 times, pausing one second
    // between transitions
    for (int i=0; i < 10; i++) {
        led->on();
        sleep(1);
        led->off();
        sleep(1);
    }
    // Delete the Grove LED object
    delete led;

  // Instantiate a grove LED on D2.  Here we are controlling a Grove
  // Multi-color flash LED.  We just just need to turn it on - it will
  // then cycle through various colors (red, green, blue, purple) on it's
  // own until turned off.
  upm::GroveLed* led = new upm::GroveLed(2);
  // start the light show
  led->on();
  // just sleep until interrupted
  while (shouldRun)
    sleep(1);
  

Public Member Functions
	GroveLed (int pin)

	~GroveLed ()

mraa_result_t	write (int value)

mraa_result_t	off ()

mraa_result_t	on ()

Public Member Functions inherited from Grove
std::string	name ()

Additional Inherited Members
Protected Attributes inherited from Grove
std::string	m_name

Constructor & Destructor Documentation

GroveLed ( int pin )

Grove LED constructor

Parameters

gpio	Pin to use

~GroveLed ( )

Grove LED destructor

Member Function Documentation

mraa_result_t write ( int value )

Turns the LED on or off, depending on the value. If the value is positive (greater than or equal to 1), the LED is turned on. Otherwise, for 0 or negative values, the LED is turned off.

Parameters

value Tells the LED to turn on (for values >=1) or off (for values <1)