PaulGuijt
Posts: 4
Joined: Wed Sep 30, 2015 12:24 pm

3.3V pin to 1.3V

Sun Apr 15, 2018 9:01 am

How can I power something with the 3.3V on pin 17, that needs only abt. 1.3V?

I am going to install a Zero in a dummy security camera that already has a (C-baby) battery powered circuit with a blinking led. I have heard that it's a very efficient circuit and led, so my first aim is to power it through pin 17.

I suppose the solution is some resistor, but I don't know which. The last time I did some calculating on simple circuitry was on highschool some forty years ago :-)

Thanks!

rich2018
Posts: 2
Joined: Mon Apr 16, 2018 4:40 am

Re: 3.3V pin to 1.3V

Mon Apr 16, 2018 5:12 am

This should help - basically you'll need a resistor to step down the voltage.
Using Ohms law you can calculate this..

see 0:40sec in this video..

https://www.youtube.com/watch?v=_nCNXY98qyE

PaulGuijt
Posts: 4
Joined: Wed Sep 30, 2015 12:24 pm

Re: 3.3V pin to 1.3V

Mon Apr 16, 2018 8:59 pm

Thanks, Rich, that brings back a bit of memory and puts me on the right track.

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