Nick Johnson

Member Since: March 12, 2011

Country: United States

  • News - SparkFun Live: Coin-opera… | about 2 months ago

    Was this inspired by my advice machine (http://blog.notdot.net/2012/09/Penny-for-your-thoughts), or just a pleasant coincidence?

  • Product RTL-09876 | about 2 years ago

    500mA per hour? Did you mean 500mAh per hour, or more simply, just 500mA?

  • Product RTL-09876 | about 2 years ago

    500mA per hour? Did you mean 500mAh per hour, or more simply, just 500mA?

  • Product WIG-09022 | about 3 years ago

    It’d be awesome if these used I2C instead of SPI. Then you could address individual panels, and you wouldn’t have to clip headers off if you want to make a 2x2 (or larger) grid. You could still update the whole panel by sending updates to all the individual segments (possibly with an enable pin to allow them to simultaneously refresh their display buffers).

  • Product WRL-08602 | about 3 years ago

    Does anyone have any arduino demo code for communicating with the fob? I’ve tried everything I can think of using the Arduino Mirf library and one of the modules, and I never receive anything from the fob.

  • Product WRL-10569 | about 3 years ago

    Isn’t this a bit expensive? An Arduino Uno is $30; an XBee is $22; an Ethernet shield is $46 for a total of $98. Admittedly, this is more compact, but still, it seems like it should be cheaper than building your own solution.

  • Product WRL-08602 | about 3 years ago

    Really? The version of avrdude I downloaded in crosspack claims to support ATTiny24.

  • Product WRL-08602 | about 3 years ago

    I think you ought to be able to implement SHA1 in the available space. A decent hash algorithm would be all you need to create an OTP-style solution, preventing replay attacks and verifying messages actually come from the fob.

  • Product SEN-10126 | about 3 years ago

    See my comment below. :)

  • Product SEN-10126 | about 3 years ago

    For those who want to flash the SM130 with I2C firmware, I’ve written a blog post about how to do so from platforms other than Windows: http://blog.notdot.net/2011/03/Using-the-SM130-RFID-NFC-reader . That post also links to the beginnings of an Arduino library for using the reader.

No public wish lists :(