can an aurduino uno run on a 7.2 volt battery?

i am working on  a project using an aurduino and a relay shield and i want to power it with a 7.2 volt battery like the kind you find in rc cars. i don't know if it will draw too much current and fry the aurduino because that wouldn't be good. is there some way to regulate current without dropping voltage? i have been doing some research on google and found people that have been doing this with an aurduino mega but that has a built in voltage regulator and i kinda fried mine a while back in the project and now i am using a resistor diode pair to keep a solid 5 volts but that isn't enough for the relay shield. 
thanks a lot
     Harry



iceng4 years ago
Yes you can run it directly off of a 7.2 volt battery..
You can verify this at Jamco Electronics..

Uno Specifications:
  • Microcontroller: ATmega328
  • Operating Voltage: 5V
  • Input Voltage (recommended): 7-12V
  • Input Voltage (limits): 6-20V
  • Digital I/O Pins: 14 (of which 6 provide PWM output)
  • Analog Input Pins: 6
  • DC Current per I/O Pin: 40 mA
  • DC Current for 3.3V Pin: 50 mA
  • Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader
  • SRAM: 2 KB (ATmega328)
  • EEPROM: 1 KB (ATmega328)
  • Clock Speed: 16 MHz

A
frollard iceng4 years ago
remembering a 7.2 volt battery hopefully won't dip too low, but could under load reasonably go well below 7 volts - so its best for small lower-draw projects.

If not, a boost-buck converter can efficiently boost the voltage up to a regulated 8-9 volts that the arduino would like.
Change the onboard regulator to a LDO.....