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Member Since: March 8, 2009

Country: New Zealand

  • The documentation is lacking dimensions for the board. Makes it difficult to design a case which uses this board without first purchasing all the bits and then measuring by hand. That, or install Eagle and read the board files :(

    Can Sparkfun please include a simple dimensions drawing in their documentation as a matter of routine?

  • Speaking of all-in-one 32U4 boards, you guys should stock these:


    They were in the schwag bags at linux.conf.au less than a month ago, and are really excellent.

  • It would be great if there was a revision of this which broke out the 32kHz pin - since that can feed the async timer of an AVR for sub-second RTC on the AVR.
    (I hadn't realised at all the CLK pin is the SPI clock. Yeah, kinda obvious now I look at it.)

  • These seem to be a huge PITA to solder (even with a stencil, they are not kidding about the prebake). However, support from the manufacturer is second to none, so I've been toughing it out.

  • It's useful to remember this is an Active Low input, arranged this way, ie it will return a 0 when read when it's active. Take that into account for your code!<br />
    <br />
    The other handy thing is many microcontrollers have built-in pullups on inputs. On AVR chips, for example, you can get rid of the external pullup by using it's internal one. Say, for example, we're reading a button on PortB1, attach the switch to GND and directly to the pin PortB1, and in your code:<br />
    <br />
    DDRB &= ~(_BV(PORTB1)); /* Make Port B1 input */<br />
    PORTB |= _BV(PORTB1); /* Enable pull-up on Port B1 */<br />
    nstatus = PINB & _BV(PORTB1); /* read switch, active low! */<br />
    PORTB &= ~(_BV(PORTB1)); /* disable pull-up */<br />
    <br />
    (This also saves a tiny bit of power for switches not being read very often.)<br />
    <br />
    YMMV, I haven't tested that code on real hardware :)

  • Any idea how fine these can tap single IC pins? Looking for something which can cope with at least 0.8mm pitch TQFP. Bonus points if it can live with 0.65mm SSOP or 0.5mm TQFP.
    SOIC in description suggests only huge packages.

  • Since the SFE Eagle Library doesn't seem to have this part, I quickly made one up. I hereby place this file into the public domain, Sparkfun or anyone else is free to use it/modify it/whatever for any purpose.
    I've had boards made up with this footprint and jacks from here, seems fine, but I make no assurances on the quality of the footprint.

  • I've managed to get this to talk okay with an ENC28J60, although not free from noise/errors just yet. (Probably breadboard construction is not helping with that!)

  • Would be awesome if these were all pins along one end - the board is quite wide on the breadboards I have, and it's difficult to get access to the rows under it. (Would probably help with soldering this for newbies... like me :) )

No public wish lists :(