[TriEmbed] Backup Power for Raspberry Pi 2

[John Vaughters]

Dwight,
A good method for dc power supply is to have two diodes in parallel. The primary source should have a higher voltage and will prevent the secondary source from suppling power. If the primary dies the secondary will kick in. So if the case is a wall power and battery power, then make sure you tie the grounds together and make sure the wall volatage is higher than the battery voltage.
John Vaughters 


     On Wednesday, July 15, 2015 10:14 AM, Dwight Morgan via TriEmbed <triembed at triembed.org> wrote:
   

 <!--#yiv1069042944 _filtered #yiv1069042944 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv1069042944 #yiv1069042944 p.yiv1069042944MsoNormal, #yiv1069042944 li.yiv1069042944MsoNormal, #yiv1069042944 div.yiv1069042944MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", "sans-serif";}#yiv1069042944 a:link, #yiv1069042944 span.yiv1069042944MsoHyperlink {color:blue;text-decoration:underline;}#yiv1069042944 a:visited, #yiv1069042944 span.yiv1069042944MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv1069042944 span.yiv1069042944EmailStyle17 {font-family:"Calibri", "sans-serif";color:windowtext;}#yiv1069042944 .yiv1069042944MsoChpDefault {font-family:"Calibri", "sans-serif";} _filtered #yiv1069042944 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv1069042944 div.yiv1069042944WordSection1 {}-->Hi All:  I need a backup power supply for my Raspberry Pi 2. I don’t think I need something as large as those made for PCs. I think one more in line with that D cell powered one in my alarm clock or a little larger would work fine.   Anybody know how to make one or if there is one out there already? Feedback appreciated!  Thanks!  Dwight  
_______________________________________________
Triangle, NC Embedded Computing mailing list
TriEmbed at triembed.org
http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
TriEmbed web site: http://TriEmbed.org


  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20150715/5c1aacc3/attachment.htm>