WS2812B Class

WS2812B Class

Description
A class for using WS2812B LED with AmebaD.

Syntax
class WS2812B

Members

Public Constructors 
WS2812B::WS2812BConstructs a WS2812B object.
Public Methods 
WS2812B::beginCheck for correct pin settings and prepare to drive the WS2812B.
WS2812B::show Pushes the color data out to the LEDs.
WS2812B::clearClear the memory.
WS2812B::setLEDCountSet total number of LED that will be used and allocate memory for all the LEDs.
WS2812B::setPixelColor Set the color of a LED.
WS2812B::fillSet multiple LEDs with the same color.
WS2812B::colorHSVConvert to RGB values from HSV.
WS2812B::rainbowFill all the LEDs with one or more cycle of hues.

WS2812B::WS2812B

Description
Constructs a WS2812B object.

Syntax
WS2812B(uint8_t input_pin, uint16_t num_leds);

Parameters
input_pin: The MOSI pin that is connected to the WS2812B LED.
num_leds: The number of LEDs that need to be lighted up.

Returns
NA

Example Code
Example: WS2812B_Basics
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Basics/WS2812B_Basics.ino)

Notes and Warnings
Only SPI MOSI pin is valid for driving WS2812B LEDs. “WS2812B.h” must be included to use the class function.

WS2812B::begin

Description
Check for correct SPI MOSI pin settings and prepare to drive the WS2812B.

Syntax
void begin(void);

Parameters
NA

Returns
NA

Example Code
Example: WS2812B_Basics
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Basics/WS2812B_Basics.ino)

Notes and Warnings
Only SPI MOSI pin is valid for driving WS2812B LEDs. “WS2812B.h” must be included to use the class function.

WS2812B::show

Description
Pushes the color data out to the LEDs by initialising SPI pins and revert all the unnecessary SPI pins (MISO, DC and SS) to GPIO function first. Then allocate the RGB data to each LED.

Syntax
void show(void);

Parameters
NA

Returns
NA

Example Code
Example: WS2812B_Basics
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Basics/WS2812B_Basics.ino)

Notes and Warnings
The amount of time needed to push the color data will increase with more LEDs. “WS2812B.h” must be included to use the class function.

WS2812B::clear

Description
Clear the memory.

Syntax
void clear (void);

Parameters
NA

Returns
NA

Example Code
Example: WS2812B_Patterns
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Patterns/WS2812B_Patterns.ino)

Notes and Warnings
This function only clears the color data from memory. To turn off the LED, please use WS2812B::show(). “WS2812B.h” must be included to use the class function.

WS2812B::setLEDCount

Description
Set the total number of LEDs to be used and allocate memory for all the LEDs.

Syntax
void setLEDCount(uint16_t num_leds);

Parameters
num_leds: total number of LEDs to be used.

Returns
NA

Example Code
NA

Notes and Warnings
“WS2812B.h” must be included to use the class function.

WS2812B::setPixelColor

Description
Verify that memory has been successfully allocated to the LED and set the color.

Syntax
void setPixelColor(uint16_t led_Number, uint8_t rColor, uint8_t gColor, uint8_t bColor);

Parameters
led_Number: The LED number, with 0 being the LED closest to the data input pin.
rColor: Red brightness level (Value available from 0-255, 0 indicates LED is off and 255 indicates LED is in the maximum brightness).
gColor: Green brightness level (Value available from 0-255).
bColor: Blue brightness level (Value available from 0-255).

Returns
NA

Example Code
Example: WS2812B_Patterns
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Patterns/WS2812B_Patterns.ino)

Notes and Warnings
“WS2812B.h” must be included to use the class function.

WS2812B::fill

Description
Set multiple LEDs with the same colors.

Syntax
void fill(uint8_t rColor, uint8_t gColor, uint8_t bColor, uint16_t first = 0, uint16_t count = 0);

Parameters
rColor: Red brightness level (Value available from 0-255).
gColor: Green brightness level (Value available from 0-255).
bColor: Blue brightness level (Value available from 0-255).
first: The index of the first LED to start filling with color (Default: 0).
count: Total number of LEDs to be set with the color (Default: 0).

Returns
NA

Example Code
Example: WS2812B_Basics
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Basics/WS2812B_Basics.ino)

Notes and Warnings
If the input parameters “first” and “count” are not provided, the default behaviour would be to fill all the LEDs. “WS2812B.h” must be included to use the class function.

WS2812B::colorHSV

Description
Convert to RGB values from HSV (Hue Saturation Value).

Syntax
uint32_t colorHSV(uint16_t hue, uint8_t sat, uint8_t val);

Parameters
hue: hue value in 16-bit. (Default: 0, acceptable range from: 0 – 65535, representing one full cycle of the color wheel. Starting from 0 for red, it increments first towards yellow, and on through green, cyan, blue, magenta, and black to red.)
sat: Intensity or purity of the color in 8-bit. (Acceptable range from: 0 – 255, you will get pastel color when value setting is adjusted to the middle).
val: Brightness of a color in 8-bit. (Value available from 0-255).

Returns
This function returns the RGB values converted from HSV.

Example Code
Example: WS2812B_Patterns
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Patterns/WS2812B_Patterns.ino)

Notes and Warnings
“WS2812B.h” must be included to use the class function.

WS2812B::rainbow

Description
Fill all the LEDs with one or more cycle of hues.

Syntax
void rainbow(uint16_t first_hue = 0, int8_t reps = 1, uint8_t saturation = 255, uint8_t brightness = 60);

Parameters
first_hue: hue of first LED (Default: 0, acceptable range from: 0 – 65535, representing one full cycle of the color wheel)
reps: number of cycles of the color wheel over the length of the strip. (Default: 1. Negative values can be used to reverse the hue order)
saturation: Intensity or purity of the color in 8-bit. (Default: 255. Acceptable range from: 0 – 255, you will get pastel color when value setting is adjusted to the middle)
brightness: Brightness of a color in 8-bit. (Defualt: 60. Acceptable range from 0-255)

Returns
NA

Example Code
Example: WS2812B_Patterns
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/WS2812B/examples/WS2812B_Patterns/WS2812B_Patterns.ino)

Notes and Warnings
“WS2812B.h” must be included to use the class function.

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