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Author Topic: Arduino is fine when connected to computer but not when on battery  (Read 627 times)
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Fine... what the DVM is saying to you ? Measurment of the voltage of the 9 V battery.

Edit :

Here what I did.   I have an Arduino with just the board and the blink program running.

With power off : 9.39 V  Connect to the board : 8.80 V and going down by the seconds.

What is your ?
« Last Edit: March 04, 2012, 09:05:37 pm by Techone » Logged

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Just running the board, the type of regulator used wastes tons of power.
I would suggest just putting 3 X AA into the 5v pin.
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i thought it was 5.5v output only...

call me stupid (on this occasion you can :-P) but surly its output only and not input? and i would need to earth it too?
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Quote
but surly its output only and not input? and i would need to earth it too?

The +5 V pin is the input voltage OR output voltage.   Huh ? 

OK...When you connect a external voltage <--- USB or through the barrel, that +5 V is OUTPUT. 

Whith nothing external connected, Well the +5 V is an INPUT. That is when you put a 4.5 V in ( 3 X AA or C or D ). A 4.5 V will work. I try it on a breadboard version.

And of course you must connect the negative to the GND of the Arduino, same of the battery controlling the servo motor.

FYI.  I did some current measurement of a servo motor. I use two type of servo. One normal servo and one for continous turn. The current for a continious is : about 160 mA.  and the normal servo : from 50 mA ( slowest ) to 200 mA ( fastest ) And my Arduino board with a 9 V battery, the current is about 40 mA. <-- That is no Led's, no shields, nothing connected except the control logic of the servo motor.

In your case, I am curious what type of current and voltage measurements ( at the barrel ) when you connect the 9 V battery.
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Well, I've connected an LED between the CS on the receiver and the GND and it seems to be working now...
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