LowPowerLab Forum

Hardware support => Moteino => Topic started by: Steven57 on March 05, 2015, 10:22:27 AM

Title: modifying PIR to lower voltage
Post by: Steven57 on March 05, 2015, 10:22:27 AM
Felix on your mod to get the PIR to operate down to 3.3v,,,,,,I could not tell by the picture if you were bridging all 4 pins of the regulator or just the right 2 to the top pin.
Clarify please?
Title: Re: modifying PIR to lower voltage
Post by: Felix on March 05, 2015, 11:06:20 AM
Click on the photo, it gets blown up.
Title: Re: modifying PIR to lower voltage
Post by: Steven57 on March 05, 2015, 12:18:43 PM
blew picture up to 240% and still not sure if all pins are bridged or just the bottom right 2 and the top.
Clarify please?
Title: Re: modifying PIR to lower voltage
Post by: Felix on March 05, 2015, 12:41:33 PM
I never thought that is not clear enough.
You're looking here (http://lowpowerlab.com/motionmote/#pirsensor) right?

Do you see this picture (far right one)?
(https://farm4.staticflickr.com/3937/15367349657_a9e68c1e7e_o.jpg)

The far left of the regulator footpring pin is clearly not bridged to anything.
And let's think use some electrical reasoning and think about it.
If all the pins of a regulator would be bridged, nothing would work, why? Because one of those pins is GND (the one that is untouched) and VOUT would be shorted to GND, not a good thing.

Is this clear hopefully?