BlipBox Circuit Design Changes

March 25, 2010 at 7:03 am 2 comments

Due to certain intermittent, but persistent problems with the last batch of PCB’s we’ve decided to make some design changes.

This means that BlipBoxes will not be available for sale for yet a bit more time, so apologies, again, to those of you waiting.

We don’t want to offer up a device that is not completely reliable, but rather take the time to fix the problem properly.

The good news is that we are already testing a new circuit which includes the MIC5891 source driver. This can drive the LED’s with up to 500mA, which is more than enough for our purposes. In fact, it should be more than enough even for a superbright blue LED version in the future.

Prototype PCB’s are currently on order, we expect to have them fully tested within the week. More news to follow.

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Entry filed under: BlipBox, News and Updates.

Birth of the Monotar New year, new PCBs

2 Comments Add your own

  • 1. floego  |  April 21, 2010 at 12:51 pm

    Is it planned a capacitive multitouch screen in future versions (maybe into a 16×16 led version)?

    Reply
    • 2. marser  |  April 22, 2010 at 10:03 pm

      I’ve been looking at capacitive technologies but not been able to figure out how to do it well in an open-source, DIY fashion. All I’ve seen so far seems badly hampered by patents and IP restrictions.
      There are resistive multitouch screens coming out, e.g. Stantum [1], which may be an option in the future. Again there are patents involved, but if an open source driver could be developed then their products might be useful.
      I have also been working on a plan to take multiple readings from the different corners of a regular resistive screen and use them to detect multitouch gestures, but so far I haven’t come up with anything that works well.

      Finally, regarding doing a 16×16 version, this would be very nice and is another thing we’ve been looking at. The main problem is that all available LED modules that we have seen (8×8 or 16×16) are square, and so do not fit with standard format touch screens which tend to be either 4:3 or wide screen ratio.

      If you have any ideas how to solve this let us know!

      [1] http://www.touchuserinterface.com/2009/06/how-stantums-resistive-multi-touch.html

      Reply

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