Pew Library Additions Reference

All functionality of the regular pew library is supported by PicoPew. In addition, the function described here is available.

pew.palette([pal][, offset=0])

Sets the mapping from the color numbers used elsewhere in the library to actual colors on the display. pal is a sequence (bytes, bytearray, list, …) of R, G, B, R, G, B, … values for up to 256 colors (i.e. 768 elements), each with values from 0 = off to 255 = full brightness. PicoPew only has a red-green display and ignores the blue components.

offset cyclically shifts the palette.

Passing no palette preserves the previous one and only adjusts the offset, which may be useful for some animations. Passing an empty palette or None sets a default palette, described below.

Changes take effect at the next pew.show().

The palette is preserved by pew.init(), much like pew.brightness(), so that a choice made by the user before starting a program stays in effect, unless the program explicitly sets its own palette (see tint.py).

This is the default palette (colors are approximate due to the very different characteristics of the LED matrix versus a computer monitor):

Expressed in terms of the bits of the color value, it works like this:

7	6	5	4	3	2	1	0
0	0	darkness				red	green	red/green compatible
0	1	hue				brightness		single-color compatible
1	red				green			true-color