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### Topic: 9V power supply issue (Read 865 times)previous topic - next topic

#### theel33

##### Oct 02, 2011, 07:20 pm
Help! I've been working on a robot, and I need it done very soon. I am using an Arduino Uno with a motor shield, and it works fine when connected to my computer, but when i plug in the 9v battery, and switch it to VIC, nothing happens. There are a series of clicks, however.

#### retrolefty

#1
##### Oct 02, 2011, 07:49 pm
Those small 9 volt batteries do not have enough current capacity to drive your motor. Try building a battery pack out of AA batteries, say 6 of them is series, that should work much better.

Lefty

#### theel33

#2
##### Oct 02, 2011, 07:51 pm
Would it still safely work with an Arduino if there were 6 AAs?

#### cmiyc

#3
##### Oct 02, 2011, 07:55 pm

Would it still safely work with an Arduino if there were 6 AAs?

Why wouldn't it be safe?
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

#### theel33

#4
##### Oct 02, 2011, 07:58 pm
well would it be too much voltage for it to handle?

#### cmiyc

#5
##### Oct 02, 2011, 08:00 pm
How many volts in a single AA cell?  (Hint:  About 1.5V)
6 * 1.5V = ?
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

#### theel33

#6
##### Oct 02, 2011, 08:02 pm
man do i feel dumb...

#### cr0sh

#7
##### Oct 03, 2011, 02:11 am

man do i feel dumb...

Realize that if you use rechargeables (mainly NiCd and NiMH), cell voltage is only 1.2 volts per cell (so 6 would give you 7.2 volts; 8 would give you 9.6 volts - note that these voltages are "standard" values for widely available radio-control battery packs); alkalines are 1.5 volts per cell (6 giving you 9 volts).

Lithium-based rechargeable batteries (Lithium Ion and LiPoly) are 2.7 - 3.7 volts per cell, however - so make sure you do the math beforehand...
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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