When it comes time to create a custom character, some bitwise arithmetic uploads the frame onto an eight-byte array, which is then plugged into LiquidCrystal.createChar().Īs mentioned before, LCDMap allows the sprite to move, so the frame is uploaded in a way that preserves its position.įurthermore, the sprite can be rotated in eight directions. If the user wishes to animate their sprite, they must define additional frames that also follow the same pattern.Įach frame is stored in a byte array, similar to how custom characters are, but the rows are wrapped around. To create a sprite, a user must define one horizontal and one diagonal frame.
#ARDUINO LCD LIBRARY WRITE TO X Y PIXEL UPDATE#
Since the characters are drawn directly from memory, overriding a character will update all instances on the display. These bytes are stored directly in the onboard memory of the LCD, which only has enough for eight customer characters. Each byte represents a row of the custom character, where each bit represents the value of the pixel (1 is lit, 0 is dark). To create a custom character, LiquidCrystal.createChar() takes an array of eight bytes. In order to understand how the library works, one must first understand how the LiquidCrystal library creates custom characters. The LCDMap library allows the user to create images (referred to as sprites) and perform the following operations: For a much more complex example, see Coy Fish. To see it in action, see the video below, which is taken from the examples provided with this repo.
LCDMap is a library that abstracts this process, allowing you to create animated, movable and rotatable images without having to worry about bit-level arithmetic. Customer character creation for the Arduino Liquid Crystal Display (LCD) requires you to construct byte arrays with specific values for bits.
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