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Topic: 9V power supply issue (Read 669 times) previous topic - next topic

theel33

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

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

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

James C4S


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

well would it be too much voltage for it to handle?

James C4S

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


cr0sh


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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