1 Topic by bananama

  • bananama
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Topic: Lasers not working, voltage issues?

Hello,

I've started with assembling my own scanner but I'm running into problems.
I've tried everything on Raspberry Pi Model B+ V1.2 and Raspberry PI 2 Model B V1.1 and can't get lasers to work.
I've only connected lasers and they don't work, and I'm also getting weird voltages, ULN2003A giving 2.7V on pin8/gnd and 2.7V on out1 and 2.4V on out2? 
Can I find somewhere what should I be getting?

The camera is working.

Also I've followed this wiring diagram, is something not right here?

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2 Reply by Tin Falcon

  • Tin Falcon
  • Tin Falcon
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Re: Lasers not working, voltage issues?

check the polarity of the lasers they are likely LED diodes have polarity.

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3 Reply by bananama

  • bananama
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Re: Lasers not working, voltage issues?

Yep, checked that, what it's weird when laser is toggled on, that on both + and - of laser I'm getting same voltage of around 3V, and that is the part that really confuses me. Same goes for ULN2003A, on PIN8 (GND) I'm getting also around 3V.

I'm not sure what I'm doing wrong or what to do next.

4 Reply by bananama

  • bananama
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Re: Lasers not working, voltage issues?

Apparently my wires or board was faulty, I changed all wires and test board and everything works now.