Led Class Reference

API for the LED. More...

Detailed Description

• ID: led
• Name: LED
• Other Names: Grove LED
• Category: led
• Manufacturer: seeed
• Connection: gpio
• Kit: gsk

UPM module for the LED (or other similar light-emitting diodes). An LED is a p-n junction semiconductor which emits light in response to voltage. 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
	Led (int pin)
	~Led ()
mraa_result_t	write (int value)
mraa_result_t	off ()
mraa_result_t	on ()
std::string	name ()

Constructor & Destructor Documentation

Led

(

int

pin

)

LED constructor

Parameters

gpio	Pin to use

~Led

(

)

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)

Returns

0 if successful, non-zero otherwise

mraa_result_t off

(

)

Turns the LED off

Returns

0 if successful, non-zero otherwise

mraa_result_t on

(

)

Turns the LED on

Returns

0 if successful, non-zero otherwise

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The documentation for this class was generated from the following files:

• /iotdk/jenkins/workspace/upm-doc-stable/src/led/led.hpp
• /iotdk/jenkins/workspace/upm-doc-stable/src/led/led.cxx