samedi 16 mai 2015

Playing with a Raspberry Pi 2

Currently futzing around with a Raspberry Pi 2 Model B. I'd messed around a bit with the original Raspberry Pi, though not too seriously.

I'm currently posting using it. The stock web browser, Epiphany, isn't too bad.

Major improvements include a quad-core processor and a gig of RAM. I also like having four USB ports instead of two. Right now, I've got the bare card sitting on the table, propped up on four hex standoffs through the mounting holes. I'm running the plain-vanilla Raspian OS on a 16-gig (I think) microSD card. Display is a "spare" full-HD LCD monitor I happened to have laying around (normally used as a director's monitor for shooting video).

Results are nice. Kinda reminds me of running on a 386 or 486-based system. The general intent is to make what I call a "writer's block," a small computer system that can be run on anything from six volts to 14.5 volts DC, so I can run it off of gel cells to a pack of D cells as a universal computer for writing anywhere.

I like the fact that there are no "rotating storage devices" to worry about. I also like the fact I can run Libre Office Writer, and transfer files to a standard USB drive to move to my "regular" computer.

The only stumbling block right now is finding a suitable display. I picked up a 9-inch LCD display kit from Sainsmart. It's like three or four modules to be cabled together, and as near as I can tell, it runs on around 12 volts DC (documentation on their web site is REAL sparse and seems to be poorly written by English-as-a-second-language speakers). I'm thinking this is the same guts used for HDMI video field monitors, which can run as low as 7.2 volts DC. The LCD kit is inexpensive enough to where I'll risk frying it at a lower voltage to see what happens. I can get inexpensive 7.2 volt lithium camcorder batteries with like 7200 mAH ratings from most suppliers.

A few things to do: put in a decent monospaced font like Courier New or Dark Courier, and find out if I can power the card itself by feeding 5 volts in through the GPIB connector, rather than he microUSB port it normally uses.

Comments and remarks welcome.

Beanbag


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