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Forum index » Electronix » Basics
simple laser pov projector wiring - uln2003a
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tomas
electronics forum beginner


Joined: 11 Jul 2006
Posts: 2

PostPosted: Tue Jul 11, 2006 10:31 pm    Post subject: simple laser pov projector wiring - uln2003a Reply with quote
hello
on my first arduino project i will make a simple pov (laser pov)
the first stage is to get a laser led(s) working from arduino out pins.
so i set up a breadboard with uln2003a darlington chip , and connected
the board as shown in this link:

http://tomsofer.googlepages.com/home

the laser led is working when powered directly from 5v out but not when
used through pin 13.
also I should ask for directions about current limiting resistor ,
though it seems there is one inside already (this is a disassembled
laser pointer)

thanks
tom
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Dave
electronics forum addict


Joined: 30 Apr 2005
Posts: 73

PostPosted: Wed Jul 12, 2006 12:30 am    Post subject: Re: simple laser pov projector wiring - uln2003a Reply with quote
tomas wrote:
Quote:
hello
on my first arduino project i will make a simple pov (laser pov)
the first stage is to get a laser led(s) working from arduino out pins.
so i set up a breadboard with uln2003a darlington chip , and connected
the board as shown in this link:

http://tomsofer.googlepages.com/home

the laser led is working when powered directly from 5v out but not when
used through pin 13.
also I should ask for directions about current limiting resistor ,
though it seems there is one inside already (this is a disassembled
laser pointer)

thanks
tom
The uln2003a will pull pin 16 to a low level when pin1 is high. You

need to connect the + LED to a 5volt source( I would use 4.5 volts to
be safe) and the - side of the LED to pin 16 of the uln2003a. I am not
sure what signal is on Pin 13 from your diagram? I am assuming it is a
TTL signal generated from the attached Arduino.

Dave
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tomas
electronics forum beginner


Joined: 11 Jul 2006
Posts: 2

PostPosted: Wed Jul 12, 2006 6:58 am    Post subject: got it Reply with quote
thanks alot dave
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Google
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