[Cyborg] 200 laser diodes
cm.hardware.software.elsewhere at gmail.com
Wed Jun 2 23:44:03 PDT 2010
On Wed, 2010-06-02 at 23:06 -0700, Eric Boyd wrote:
> Indeed! My plan is to basically hack a North Paw board into doing the
> work, but according to my calculations you should just be able to use an
> Arduino. 50mW laser diodes. If we assume they have a 3V drop (the page
> says "battery: 3-5V"), that means 16.7mA each, which you can drive with
> an arduino pin. Anyone know the total power an Arduino can drive/sink?
> I'm just wondering how many of the pins you could have going at once...
chapter 22, Absolute Maximum Ratings,
you can draw up to 200 mA through the power pins
and 40 mA through any one I/O pin,
meaning that without a driver, you shouldn't try to drive more than 10
laser diodes directly.
(Note that an earlier version of the data sheet quoted 300 mA absolute
maximum rating; this means that you can probably get away with driving
more current for a prototype, but NOT repeat NOT for stuff you want to
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