samedi 6 avril 2013

Discovering the Raspberry Pi / Gertboard - Part B


A first example with the Gertboard

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The Gertboard revision I have used is marked 21 Oct 2012.

The related Gertboard User Manual document version 2.0 (Gertboard_UM_with_python.pdf) describing the hardware can be found in
http://raspi.tv/downloads

Playing with the Gertboard leds


The Gertboard fits directly onto the GPIO pins of the Raspberry Pi via a double row of pins socket on the back of the Gertboard.



We can see some leds active on the top.
The straps (the coloured wires) and jumpers as explained in this nice tutorial here:

http://www.tech-fruits.com/all-tutorials/the-gertboard-lesson-2-testing-the-buffered-io-section/

where we can find everything about the hardware and the software. This is not my intention to repeat here this information.

The wiring diagram for the LED test program is also described in the Gertboard User Manual at page 21.



To download the Gertboard C software, we can go for instance to the Web site http://www.element14.com.

I have downloaded the file gertboard_sw.zip into my Raspberry working directory and to install and compile the software:

unzip gertboard_sw_20120725.zip
cd gertboard_sw
make all

and to execute the program:

sudo ./leds



We could have a look at the leds.c source code to see how patterns are used for the leds and maybe understand what happens if we do not have enough wiring cables between the "GP" and "B" pins.



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