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Posts posted by PhirePhly

  1. Ah Nuts! I just remembered about the MAC address stuff.


    If a person is going to create a device that has ethernet then you have to get your own MAC address block. That costs moolah.


    Not a problem. The OUI (Organizationally Unique Identifier - First three octets) has a flag for locally administered MAC addresses, so set the 02:00:00 bit in the OUI and make sure it's unique on your network, and you're fine.


    I never got around to doing much with it, but I was at one point working on building an Ethernet SPI daughter board. Between that and a decently powerful controller, you could conceivably build one yourself.

  2. but this 8x8 matrix pinout seems kind of weird to me


    It took me several months and reverse-engineering several displays before I finally figured out the bizarre pinouts they have. With at least the ones I worked with, they're rotationally symmetric; You can unplug it, rotate it 180 degrees, and plug them back in and they still work!


    Blew my mind.

  3. Well someone's gotta be first:


    A basic battery-powered LCD clock. Tells time in 24 hour format through a 4 digit seven segment LCD. Two buttons for setting hour and minute. Running current is below 12uA, which means this thing is looking forward to a good 2.5 years running off a CR2032 coincell, like it is. With just the 100uF capacitor and no battery, it can run for more than 15 seconds, so even battery replacements can be done without loss of time, if you're fast enough.


    The display is wired to display full hexadecimal, so it can really be used for any project that needs a 4 digit LOW power display. A 20DIP MSP430 would probably help the power budget to a degree, removing the need for the shift register between the MSP430 and LCD driver. If only I had waited another month to build this one...



    Source code


    Full writeup with video and parts list


  4. We all seem to use a lot of resistors in our projects too, but that might just be because they're a few cents per piece... I'd expect everyone here to have one or two LP boards kicking around, so inevitably the projects are going to be based on them, but I will do nothing but encourage you to move OFF the launchpad to other platforms as quickly as you see fit. It's a $5 dev board; there isn't much there to get excited about.

  5. @jbremnant do u and / or joby has a secret url to send in "tips"? both of u made it more than once (actually joby must have made more than three times).


    In the last few years, HaD has definitely moved towards trying to be a HIGH volume blog, so they'll take less than you'd expect. I can think of only one or two projects I've submitted that haven't been featured, and many have been featured that I didn't even bother submitting...


  6. I strongly doubt you would be able to do much with 2kb of program space. With the restrictions of the Launchpad, I would hope more for a proof-of-concept ping server than a PoC web server... As for where it would become possible (8k? 32k?), that is more a function of skill...


    I have built my own breakout board for the ENC28J60, but it was only a marginal cost savings... I still need to play with that...

    http://kennethfinnegan.blogspot.com/201 ... works.html

  7. Try plugging in the GoodFET and running # lsof | grep USB as root. The replacement for HAL, upowerd, has a bad udev rule for the FTDI chip and grabs it. The FAQ on goodfet.SF.net just got updated, but I've only done testing on Ubuntu 10.04, but it would probably effect the newer version of Debian as well.

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