GroveLEDBar Class Reference

API for Grove LED Bars base on the MY9221. More...

Detailed Description

• ID: groveledbar
• Name: Grove LED Bar
• Other Names: MY9221 LED Bar
• Category: display
• Manufacturer: seeed
• Link: http://www.seeedstudio.com/wiki/Grove_-_LED_Bar
• Connection: gpio
• Kit: eak

This is a 10-segment LED bar, with 8 green segments, 1 yellow segment, and one red segment. They can be daisy chained together so that this module can control multiple LED bars.

  // Instantiate a GroveLEDBar, we use D8 for the data, and D9 for the
  // clock.  This was tested with a Grove LED bar.
  upm::GroveLEDBar* bar = new upm::GroveLEDBar(8, 9);

  while (shouldRun)
    {
      // count up from green to red
      for (int i=0; i<=10; i++)
        {
          bar->setBarLevel(i, true);
          usleep(100000);
        }
      sleep(1);

      // count down from red to green
      for (int i=0; i<=10; i++)
        {
          bar->setBarLevel(i, false);
          usleep(100000);
        }
      sleep(1);
    }

Public Member Functions
	GroveLEDBar (uint8_t dataPin, uint8_t clockPin, int instances=1)
	~GroveLEDBar ()
void	setBarLevel (uint8_t level, bool greenToRed=true, int barNumber=0)
Public Member Functions inherited from MY9221
	MY9221 (uint8_t dataPin, uint8_t clockPin, int instances=1)
	~MY9221 ()
void	setAutoRefresh (bool enable)
void	setLED (int led, bool on)
void	setLowIntensityValue (int intensity)
void	setHighIntensityValue (int intensity)
void	setAll ()
void	clearAll ()
void	refresh ()

Additional Inherited Members
Static Public Attributes inherited from MY9221
static const int	LEDS_PER_INSTANCE = 12
Protected Member Functions inherited from MY9221
virtual void	lockData ()
virtual void	send16bitBlock (uint16_t data)
Protected Attributes inherited from MY9221
bool	m_autoRefresh
uint16_t	m_lowIntensity
uint16_t	m_highIntensity
unsigned int	m_instances
uint16_t *	m_bitStates
uint16_t	m_commandWord
mraa::Gpio	m_gpioClk
mraa::Gpio	m_gpioData

Constructor & Destructor Documentation

GroveLEDBar	(	uint8_t	dataPin,
		uint8_t	clockPin,
		int	instances = 1
	)

Instantiates an GroveLEDBar object

Parameters

dataPin	Data pin
clockPin	Clock pin
instances	Number of daisy-chained Grove LED Bars, default 1

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~GroveLEDBar

(

)

GroveLEDBar destructor

Member Function Documentation

void setBarLevel	(	uint8_t	level,
		bool	greenToRed = true,
		int	barNumber = 0
	)

Sets the bar level

Parameters

level	Selected level for the bar (0 - 10). 0 is off
greenToRed	true if you start the level on the first green LED, false otherwise
barNumber	If you have multiple LED bars chained together, this argument selects a specific bar starting at 0. The default is 0.

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Inheritance diagram for GroveLEDBar:

Collaboration diagram for GroveLEDBar:

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

• /iotdk/jenkins/workspace/upm-doc-stable/src/my9221/groveledbar.h
• /iotdk/jenkins/workspace/upm-doc-stable/src/my9221/groveledbar.cxx