Hi,
I want to power the Arduino Uno board with 12V 1.3Amp battery but i am afraid that the board may get damaged.
Please provide any suggestions to do the same.

 

hi CJ,
Look at this link.
https://www.open-electronics.org/the-power-of-arduino-this-unknown/
Also: Google Arduino power supply.
E

 

I'd suggest getting something like http://www.ebay.co.uk/itm/New-LM259...266330?hash=item41b5667a5a:g:cp4AAOSwpLNX-IZ4
or similar. Lots out there for not much more than a dollar. I've got a few in stock for when I need one (not worth constructing oneself).
The one quoted has max output of 2A. You'd need to adjust the output to 5V. Put a 1 or 2A fuse between the 12V battery and the buck converter just in case!

Geoff.

 

The first thing is that you have to make sure the supply voltage of your arduino is 5v or 3.3v, if supply 5v then using a 7805, if supply 3.3v then using a LD1117-3.3V to be the voltage regulator.

 

The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board.

That said most 12 volt batteries, for example a 12 Volt SLA Battery actually have a voltage of about 12.7 Volts or about 2.12 volts per cell so 2.12 * 6 = 12.72 when fully charged. In keeping things simple you could just place a few diodes in series where each diode will drop about 0.7 Volts. A common 1N4002 would work. This just makes sure you don't exceed 12 volts to the board.

Ron .

 

If you want maximum battery life then use an efficient buck regulator as gdm_klog suggested, to reduce the 12V to 5V or 3.3V as needed.

 

The Arduino Uno much like the Arduino Duemilanove has onboard regulation for 5 volts. When running on USB the board draws its power from the 5 volt USB connection. When externally powered the board accepts a 7 to 12 VDC input on the power connector. Here is an example of the older Arduino Duemilanove board with the regulator identified:


The newer board uses a 1750 Low Dropout Regulator, you do not feed the board an external 5 volts. This is why the suggested input is 7 to 12 VDC. Actually it uses a LD1117-50 Regulator. Feeding 5 volts into the external power input will not work as it requires 7 to 12 Volts per the manufacturer.

Ron

 

Pretty clear that most of these guys who responded have never used an Arduino before...

You can connect the battery directly to the "power in" jack or Vin/ground connections as the Arduino UNO already has a built in 5V regulator

Here are the specifications from the UNO..
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V

As 12V < 20V you can connect the battery without any external regulators,etc...

 

Pretty clear that most of these guys who responded have never used an Arduino before...

You can connect the battery directly to the "power in" jack or Vin/ground connections as the Arduino UNO already has a built in 5V regulator

Here are the specifications from the UNO..
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V

As 12V < 20V you can connect the battery without any external regulators,etc...

Thank you and I never caught the 6 to 20 Volt. I only saw the 12 Volt under 7 - 12. Thanks again.

Ron

 

Pretty clear that most of these guys who responded have never used an Arduino before...

Touché !
Actually, I always tend to have a USB plugged in to my Uno, so have 5V on the brain. Apologies.