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timb

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timb last won the day on April 5 2015

timb had the most liked content!

About timb

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  • Birthday 09/30/1984

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    http://timb.us

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    Virginia
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    https://github.com/timothybrown
  1. Oh, and here is a basic tree of how simple the structure would be in terms of libraries if I went the custom route. This may be the way I go ultimately for speed. I might initially start off with a simpler web interface that allows you to define instruments and simply write scripts for them. Once that
  2. Okay, just a quick update, still working on the layout. I realized I hadn’t made a few of the part footprints, so I finished that up last night. I also ran into some difficulties routing the cap touch FFC, but I’ve found a solution so I’m working that right now!
  3. Ahh, I guess they’re using a custom protocol that will only work with their custom iOS/Android apps. They say it’s for use with your BBB outdoors, but why wouldn’t I just grab a $10 WiFi adapter and set it up as an ad-hoc network or base station? Then I could SSH into it from any device... Also, there’s already a host of $5~ Bluetooth Serial Modules that will do the same thing, but don’t require a custom app. (I use this method literally all the time; I’ve got about 5 of these adapters and use them to program/debug everything from my MSP430s to Spark Cores to BeagleBones.
  4. Those problems mainly come from a problem with older Angstrom releases. I think one guy may have had a legitimate hardware issue. Unless they’re running the analog signals all the way across the PCB, I can’t imagine what the issue could be.
  5. Okay, so I’ve been sick all this week, which seriously delayed things. The good news is that, during that time my sample display arrived from China. I just got all the measurements I needed from the FFC and am working on the PCB layout now. Basically I just have to add a few footprints, manually route the backlight driver, position the FFC connector and BBB headers, then I can let the auto-router handle the rest. (I’ll do a hand cleanup afterwards; I rarely use an auto-router, but in this case it’ll work well for getting the optimal positioning of the 40 signal traces.)
  6. I followed the project awhile back when it was originally done; so glad to see it picked up for Summer of Code! I should finish my 150MHz Oscilloscope Cape soon; it would pair great with this. (About $50 in parts for a two channel ~150MHz/150Msps scope; most of the cost is in the CMOS Parallel or LVDS ADC. It connects to the PRU which is responsible for clocking the data directly into DDR.)
  7. I’m working on an open test instrument platform for the BBB; in doing so I’m splitting it up into various sub-projects. I thought the community would be interested in the 5” LCD I’ve got going for independent use, so I plan on making a standalone cape for it, for those interested. The CircuitCo and 4DSystems 7” LCDs currently on the market both run at 800x480 and use standard 24-Bit Pixel Clock interfaces over. The CircuitCo LCD has a 60-pin ZIF interface, while the 4DSystems version uses the more common 40-pin ZIF connector. The difference essentially comes down to power: LCDs with 40-pin interfaces will run straight off of 5V, while the 60-pin panels require a bunch of voltage levels to be externally generated (+10, +15, -7 in the case of the CircuitCo panel). So, this got me thinking… There’s a plethora of 5” LCDs with an 800x480 resolution and 40-pin interfaces on the market. I figured as long as it used the same electrical interface and resolution, it should work straight off with the BB-BONE-LCD7-01 overlay (this is how the 4DSystems 7” panel works). As it turns out, I was right! Currently I’ve got the screen up and running with a standard 4-pin resistive touchscreen, however I’ve got a nice capacitive overlay on the way from China, which will be used in the final version of the board. Here’s a few pictures of the test setup up and running. The last picture is a closeup of the display, but it really doesn’t do the quality justice. Hopefully I’ll have the Cape done this week. If there’s any interest I’ll order a dozen or so boards and sell them to members at cost for testing.
  8. Awesome, that's one thing I didn't like about their cape. (I dislike proto shields that have random SMD footprints on them; they're never the size or type you need; I'd rather have more holes *or* like 0603 to TH footprints, which would at least be useful for pull downs/ups and LEDs.) FYI, on LGX's EEPROM proto board, the SOT-23 section on the right side snaps off, giving you access to the reset/power buttons.
  9. I actually just stumbled onto these articles while doing a search for information about the PRU compiler while installing CCS6 on a new machine. Very good stuff, I can’t wait to play with this over the week! So glad to see active development in these areas.
  10. I based it on a commercially available unit that I got the specs for, I then tweaked it using an antenna calculator. 5mm inside diameter, 17 turns at 34mm length. I'm sure it's not perfect, but I'm confident it's as good as the OEM antenna, which is just the top metal casing that goes over the watch face.
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