GroveLEDBar Class Reference

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

Detailed Description

• ID: groveledbar
• Name: 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 (int dataPin, int clockPin, int instances=1)
virtual	~GroveLEDBar ()
void	setBarLevel (uint8_t level, bool greenToRed=true, unsigned int barNumber=0)
Public Member Functions inherited from MY9221
	MY9221 (int dataPin, int clockPin, int instances=1)
virtual	~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
Protected Attributes inherited from MY9221
my9221_context	m_my9221

Constructor & Destructor Documentation

GroveLEDBar	(	int	dataPin,
		int	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 ( )

virtual

GroveLEDBar destructor

Member Function Documentation

void setBarLevel	(	uint8_t	level,
		bool	greenToRed = true,
		unsigned 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:

• src/my9221/groveledbar.hpp
• src/my9221/groveledbar.cxx