Chapter 12. Plugins
144
LED resistance
LED resistance calculator is used to determine the resistor necessary to light an LED
safely at a given voltage.
First, select the voltage that the LED will use (the first
option is the most common and a safe bet), and the current that it will draw (likewise
with the first option). Then, use the onscreen keyboard to type in the supply voltage
and, if selected, the custom forward current. This function produces safe estimates, but
use your own judgement when using these output values. Power rating and displayed
resistance are rounded up to the nearest common value.
12.4.16. Rockpaint
Figure 12.50.: Rockpaint
Rockpaint is a bitmap (
.bmp
) editor for Rockbox. It can open any
.bmp
file whose di-
mensions are the same size as your device’s screen or smaller; it can also create empty
bitmaps for you to work with.
Opening A File
To open a file, you may use either the context menu option “Open With” in the File
Browser, or you may enter Rockpaint first using the Plugins menu and open a file from
there. To perform the latter, simply press Rockpaint’s Menu button or move the cursor
beyond the bottom of the screen; then move the cursor onto “Menu” and select it. Fi-
nally, select “Load” and navigate to the image you wish to open.
Tools
Rockpaint offers several tools to aid you in editing; you can view them by either pressing
Rockpaint’s “Menu” key or by attempting to move the cursor beyond the bottom of the
screen. From top to bottom and left to right, and by section, they are as follows:
Colour Picker
The top left tool shows your colours that are at the ready. To swap them,
“click” on the background colour. To edit the foreground colour, click on it.
The Rockbox manual
(version 3.13)
Sansa c200v2 Series
