Module com.pi4j.crowpi
Package com.pi4j.crowpi.components.internal

Class HT16K33

java.lang.Object
com.pi4j.crowpi.components.Component
com.pi4j.crowpi.components.internal.HT16K33
Direct Known Subclasses:
SevenSegmentComponent
public class HT16K33 extends Component
Implementation of HT16K33 LED driver chip used for segment displays. Uses I2C via Pi4J for controlling the chip programmatically.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected final byte[]
    buffer
    Internal buffer where all digits get stored before being flushed to the display.
    protected final com.pi4j.io.i2c.I2C
    i2c
     

    Fields inherited from class com.pi4j.crowpi.components.Component

    logger

  • Constructor Summary

    Constructors
    Constructor
    Description
    HT16K33(com.pi4j.io.i2c.I2C i2c)
    Creates a new HT16K33 instance using the given I2C instance from Pi4J.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    clear()
    Clears the internal buffer without refreshing the display.
    void
    refresh()
    Flushes the internal buffer to the chip, causing it to be displayed.
    void
    setBlinkRate(int rate)
    Changes the desired blink rate for the seven-segment display.
    void
    setBrightness(int brightness)
    Changes the desired brightness for the seven-segment display.
    void
    setEnabled(boolean enabled)
    Specifies if the seven-segment display should be enabled or disabled.

    Methods inherited from class com.pi4j.crowpi.components.Component

    sleep, triggerSimpleEvent

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • buffer

      protected final byte[] buffer
      Internal buffer where all digits get stored before being flushed to the display.

    • i2c

      protected final com.pi4j.io.i2c.I2C i2c

  • Constructor Details

    • HT16K33

      public HT16K33(com.pi4j.io.i2c.I2C i2c)
      Creates a new HT16K33 instance using the given I2C instance from Pi4J.
      Parameters:
      i2c - I2C instance

  • Method Details

    • clear

      public void clear()
      Clears the internal buffer without refreshing the display. This means that the current contents of the displays are still being shown until refresh() is called.

    • refresh

      public void refresh()
      Flushes the internal buffer to the chip, causing it to be displayed. The contents of the buffer will be preserved by this command.

    • setEnabled

      public void setEnabled(boolean enabled)
      Specifies if the seven-segment display should be enabled or disabled. This will activate/deactivate the internal system oscillator and turn the LEDs on/off.
      Parameters:
      enabled - Display state

    • setBlinkRate

      public void setBlinkRate(int rate)
      Changes the desired blink rate for the seven-segment display. This method expects an integer value within the range 0-3, with 0 being equal to no blinking and 3 being the fastest choice. The whole display is affected by this command which gets immediately applied.
      Parameters:
      rate - Desired blink rate from 0-3

    • setBrightness

      public void setBrightness(int brightness)
      Changes the desired brightness for the seven-segment display. This method expects an integer value within the range 0-15, with 0 being the dimmest and 15 the brightest possible value. The whole display is affected by this command which gets immediately applied.
      Parameters:
      brightness - Desired brightness from 0-15