Pages: [1] 2   Go Down
Author Topic: Power Supply  (Read 1291 times)
0 Members and 1 Guest are viewing this topic.
Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I was wondering if there is any way to power arduino with two wires from a battery holder. I read something about the VIN pin but did not completely understand it. Would I connect + to VIN and - to Ground? Also, is 6 Volts enough to power arduino? 

Thanks,
Jack
Logged

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 508
Posts: 31382
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

6 volts is too much to run the arduino processor directly but not enough to drive the 5volt regulator. You need at least 7volts for this if you are going to apply it to the Vin pin.
Logged

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks for the quick reply. So, would 5 AA Battery's do the trick?
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 437
Posts: 23660
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

A 3-cell AA battery holder with the + to the Arduino 5V pin and - to ground will work for you.

What other things will you be connecting?

I'd like to find a 3 D-Cell battery holder, that would give plent of juice! The only time I've seen that this is as a flashlight smiley-cool
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.

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 437
Posts: 23660
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

With 5, you're just heating up the regulator. Try 3 first direct to 5V and see how you do.
DO NOT CONNECT BACKWARDS!
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.

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset


So that would provide power without a power supply or USB cable? What if i were to connect backwards?
I would probably be connecting just leds, sensors, and maby a buzzer.

Logged

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Could i connect an 9 volt battery that way?
Logged

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 508
Posts: 31382
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
What if i were to connect backwards
Then there is a good possibility you would fry the arduino.
Yes a 9v battery into Vin would work but it would waste power and those square batteries do not have much in the way of current capacity.
« Last Edit: June 08, 2011, 05:38:18 am by Grumpy_Mike » Logged

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

So would this power my arduino: 3 AA batters with + to VIN and - to GND?
Logged

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 508
Posts: 31382
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

No as have been mentioned before. If you have three you have to connect it directly to 5V line.
Logged

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Oh OK. So if i have 7 or more volts, then use VIN. But if I have less use the 5V. So what would be the Best way to power my arduino?
Logged

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 508
Posts: 31382
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
So what would be the Best way to power my arduino?
It depends entirely on what you want to do with the system. What load you have, and how long you want the battery to last.
Logged

Directly above the center of Pluto, or near Pittsburgh
Offline Offline
Newbie
*
Karma: 0
Posts: 42
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I would want to run a sensor, leds, and maby a buzzer. I would like the battery to lasts around an hour.
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 437
Posts: 23660
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

I'd go with 3 AAs, if not enough try 3 Cs, 3 Ds ...
Really depends how many LEDs, how much current they are drawing, how long the buzzer is turned for, etc.
Who knows, maybe 3 AAAs will get you by.
Maybe 4 rechargeables will do at 1.2V each.
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.

CO, USA
Offline Offline
God Member
*****
Karma: 4
Posts: 710
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Granted, you can't run down to the local convenience store to buy them, but why not use Lithium-Manganese rechargeables? You can get LiMn 14500's for about $6/apiece, and they'll last something like 300-500 charge cycles. Also, LiMn has a high current capacity. The "AW" brand LiMn are more expensive. With 2 of those in series, you get nominally 7.4V.

They're tight, but the 14500 will fit in a 2AA battery holder. You might have to fiddle with the contacts a bit.
Logged

... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

Pages: [1] 2   Go Up
Jump to: