MechCD

Member Since: September 7, 2009

Country: United States

  • Has anyone had a problem with these flat-lining after a year or so? I have one mounted outdoors in a waterproof box with a breather hole and it worked great for about 7 months and then it slowly got less responsive and after about a year it got stuck at 70% all the time. Should I use an HIH-4031 since it is outdoors?

    I’m going to try and stick it in a bag of fresh silica gel to see if I can get a response out of it.

  • Can I still use DIO5 for other purposes or does the XBee need DIO5 exclusively? I have an Arduino Uno and need both DIO4 and DIO5 for interrupts.

    I have tried the shield without the XBee installed and when DIO5 is active on the Arduino, the LED lights up on the XBee shield.

  • What’s a “DC representation of the amplitude”? An analog DC voltage between VDD and VSS? That datasheet is pretty rough.
    It looks like this would work great with a set of LM3916s and a demux to make a simple spectrum analyzer

  • maybe i should clarify… maybe we shouldn’t be worried about encrypting everything and trying to be secure, maybe find out why people are inclined to steal stuff to begin with

  • Way too complicated. All ya need is 1 bad employee and a dummy reader that looks like the regular one. All it would do is read the card and store the pin….. no need to reverse engineer anything.
    “Oh the machine is broke, i can’t give you a receipt”

  • I don’t actually have one of these but from the schematic and the instructions, I’m guessing its all multiplexed.
    the header for D1 actually has 3 LEDs “stacked” together
    [D1]
    R G B <- top LED
    | | |
    R G B <- middle LED
    | | |
    R G B <- Bottom LED
    The rows are selected using the C (common) pin
    [D1] [D2] [D3]
    RGBC-CRGBC-CRGB (row 1)
    | | |
    RGBC-CRGBC-CRGB (row 2)
    | | |
    RGBC-CRGBC-CRGB (row 3)
    So to light up the top left red (D1, row 1), you would need to select D1’s red and row 1 common
    I’m not so sure that blue-line-multiple-outputs thing on most of the schematics is actual industry practice either…. it makes it very hard to follow. Maybe something like this : http://commons.wikimedia.org/wiki/File:MFrey_Task_1_Solution_NAND.svg
    The lines coming off the micro are vertical and the stuff connecting to it uses horizontal lines.

  • StickOS is a lot easier to use than Mircochip’s C if you’re just getting your feet wet or want to do a little more than the built in firmware

No public wish lists :(