Pages: [1]   Go Down
Author Topic: Power supply for uno?  (Read 517 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Full Member
***
Karma: 0
Posts: 125
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm in need of a power supply for a finished project.  If I read the docs correctly a 5V power supply is not enough and should be minimum 7V.   I have room for a small open frame power supply but am having trouble finding a cheap one.  I looked at Jameco and they don't show a 7V open frame.  12V is pushing the limit according to the docs.  Should I just take a wall wart and cut it open and mount it inside the project?  I don't want to use a wall wart outside the project because the it also needs line voltage and I don't want two cords to plug in.  So it is best for me to include a power supply inside.  Any tips on good power supplies?
Logged

SE USA
Offline Offline
Faraday Member
**
Karma: 41
Posts: 3783
@ssh0le
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

7 volts is needed for the on board regulator, if you get a regulated 5 volt supply you can attach it to the 5 volt and ground point on the board

or you could crack open a wall wart
Logged


Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 548
Posts: 27386
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

These are good and pretty small, I use them a lot.
Either 5V direct to 5V pin on the power header, or 7.5V to the barrel jack.
http://www.dipmicro.com/store/DCA-0520  1A version available too
http://www.dipmicro.com/store/DCA-07510
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Offline Offline
Newbie
*
Karma: 1
Posts: 35
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

You could also just use a USB adapter and plug it into the USB-port on the arduino. Works fine for me.
Logged

Offline Offline
Sr. Member
****
Karma: 1
Posts: 462
I am a amateur.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I think that you can also use 4 NiMH batteries in series directly into the 5V and GND pins (mind polarity). NiMH batteries are about 1.2V each. Powering the Arduino with a 9V battery is a waste (even though I do that) because...
*You give the Arduino 9 volts, only to let the voltage regulator drop it to 5V; 4/9 of the energy wasted
*9V batteries have poor current capability
*They have low capacity (about 0.5Ah) while NiMH batteries have about 2Ah
*They are expensive
« Last Edit: June 10, 2012, 08:30:23 pm by dkl65 » Logged


Pages: [1]   Go Up
Jump to: