rahlquist
Posts: 149
Joined: Tue Jan 21, 2014 1:02 pm

Powering the Pi 2

Fri Jan 08, 2016 3:19 pm

Hello,

So I have been playing with the Pi for quite a bit, both the Model B and now the Pi 2. Since the Pi 2 came out I had fed it with a 12v 2A power supply dropped through a module very much like this one ( http://www.ebay.com/itm/5V-USB-Converte ... 0813369212 ). It worked, but I always had the red LED blinking if I had the Pi Camera and wifi hooked to the Pi. So checked it out and I was getting a voltage of only 4.7-4.8v out the Pi usb ports. I was using a Monoprice 24/28awg 3' cable at the time. Eveything worked with only a couple lockups over the past year.

Last night I upgraded the voltage reg to this one; http://www.ebay.com/itm/221921225118?_t ... EBIDX%3AIT Placing a meter on the USB port of the pi as well as monitoring the readout on the new regulator I proceeded to increase the voltage until I got 5.0v out of the usb ports on the pi and the red LED would no longer flash when I ran my hand infront of the camera (causing motion detect to fire and start recording video over the wifi to my server). The final output on the regulator now reads 5.4v. The Pi reads a nice 5.0-5.03 volts on its usb output. I plan on moving the PS to close proximity and shorten the cable drastically to a few inches but before I did that I wanted to ask, should I stick to the micoroUsb connector or go to GPIO or ..?

W. H. Heydt
Posts: 12410
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: Powering the Pi 2

Fri Jan 08, 2016 4:38 pm

With what you're seeing...stick with the microUSB power connector. That way, the Pi has some overvoltage protection as well as the current limiting polyfuse.

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davidcoton
Posts: 4901
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Location: Cambridge, UK
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Re: Powering the Pi 2

Fri Jan 08, 2016 4:52 pm

rahlquist wrote: I plan on moving the PS to close proximity and shorten the cable drastically to a few inches but before I did that I wanted to ask, should I stick to the micoroUsb connector or go to GPIO or ..?
Stick to microUSB, but also remember to back off the PSU to 5.25V BEFORE connecting a shorter or thicker cable. In theory you may have a problem on shutdown -- current drops, so less cable loss, so more volts on the Pi input. I think it will survive 5.4V but it is at your own risk. :?
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rahlquist
Posts: 149
Joined: Tue Jan 21, 2014 1:02 pm

Re: Powering the Pi 2

Sat Jan 09, 2016 1:43 am

Thanks guys. I'll stick with usb but will replace the cable with 20awg or better. I was going to buy a few of these https://www.adafruit.com/products/2789 but the cheapest shipping option was $9+ and they can cram that. Priority mail is cheap and easy but they don't even go there. So I orderd 5 from China, it may take a month to get here but I know I didn't over pay.

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