A collection of SoC Projects

allmylittledroids7Figure 1: A growing Collection of little Soc/SBC powered computers (click to enlarge).

Today, when I visited my own site, I realized how confusing some of the projects may seem, because they reference different boards and things, and it’s a little bit of a jumble, and it’s hard to tell the players without a program.  Figure 1 should sort out some of the details.  There are two “homemade” tablets and two “homemade” servers at this point, all ARM CPU architecture powered, by SoC based SBC boards.

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Communicating w/o Standard WiFi

silo2Figure 1: The communications device antenna is within its protective sleeve.

More than one way to communicate

To communicate between devices, one can use standard WiFi, but devices for it typically have a pretty high power consumption rate.  I found some micro powered communication boards that operate in the unlicensed 2.4 GHz band (in the same frequency range as WiFi).   These devices can run on as little as 5 milliwatts.  I’ll describe my experiments with them in the next page or so.

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Testing the Membrane Pad on the Pi2

firstmembranetest-frontface1Figure 1: Testing the membrane pad on the Pi2 powered “homemade” tablet.

The little pull-up board was mounted near the Pi2, so as to make the wires shorter.  It was mounted vertically, in that space between the enclosure’s connecting posts.  Then, I made the first test of the membrane pad, using the wiringPi gpio command to read all GPIO at once …

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SDR/Audio/Pi2

crammed-raspiriscytabletFigure 1: The “homemade tablet” is getting cramped. (Click to expand)

In figure 2, it can be seen that the little “homemade” tablet is getting quite cramped. Note that I did not mount the Cirrus card on the 40 pin IO connector of the Pi/2. This was to facilitate use of the GPIO pins for other things. There is also a vertical clearance problem to deal with. So, there will be individual wired female header lines coming from the audio board to the Pi/2 J8 connector (not yet in place).

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