Power needs on my Arduino. huh.. kinda lost

A newbie to arduino with some basics questions here. Hope you can help me and some day i can pay the favor back. Some context: I really would love to power up my projecto with a 9V/6V battery and have SLEEP and INT lowering my power needs. *1 - I have some difficulty understanding wich one of those two are the best option for lower my power consumption to the minimum: LowPower. h or ArduinoSleepCode. *2 - To power up Arduino. Does DC-DC buck and feeding on the +5V pin (not the Vin pin) payoff? or im just better feeding the battery on the Vin pin of my arduino (with a 6v battery) ? *3 - if i bypass the regularor i have to give the arduino always de 5V precisely, no more or less.. or my totally rong and it's the ripple that will burn my chip? *4 - does this all matter, or im better off focusing on disable the LED and pre-scale the clock down? Thx in advance for the help.

ps: hope i did pick the rigth sub-forum

Welcome to the forum.

Can you tell what you have, and give links to those libraries. Do you mean this one ? http://www.rocketscream.com/blog/2011/07/04/lightweight-low-power-arduino-library/ And this one ? http://playground.arduino.cc/Learning/arduinoSleepCode

I know this : http://gammon.com.au/power and this : https://code.google.com/p/narcoleptic/

Using an Arduino Uno board and making the microcontroller got to sleep is not very useful. There too many other components on the board that require current. A bare-bone ATmega328p chip, made Arduino compatible, with just 3 AA batteries can be used for long battery powered operation.

Which board do you have, and are there extra components (sensors, displays and so on) that require current ?

Can you tell what you have, and give links to those libraries.
Do you mean this one ? http://www.rocketscream.com/blog/2011/07/04/lightweight-low-power-arduino-library/
And this one ? http://playground.arduino.cc/Learning/arduinoSleepCode

Yes those libraries, my bad for not putting the links.

I have acess to a arduino uno, arduino pro mini and some atmega328 microchip.

A bare-bone ATmega328p chip, made Arduino compatible, with just 3 AA batteries can be used for long battery powered operation.

Gammon Forum : Electronics : Microprocessors : Power saving techniques for microprocessors <---- this was very usefull and answer a lot of my doubts. thx thx thx!!

I have a couple project lying around, my trying to learn as much as possible the amazing world of the arduino and microcontroller. The more i lower power need form the chip the better. I’m atm doing using a UNO with a PIR (through a BJT inverter) wakes up my arduino and send a email. I haver other project lying around (with 5v relays, 4display7segments display, piezo… since im trying to prepare my self for a EE degree).

I did know my question were not specific and maybe to vague.

Thx for the help XD

The typical battery operated Arduino is this: A barebone Arduino (ATmega328p chip), with 3 AA batteries and a 433MHz transmitter and some sensors. It wakes up once in 5 minutes and reads the sensors and transmits them. It will last for more than 1 year, perhaps even 2 or 3 years.

You should get a programmer, or try the "Arduino as ISP". That way you can write the Arduino bootloader into ATmega chips.

There are so many things you can do. Do you have other hobbies ? I'm sure the Arduino can be used for it. There is a Playground section to give you an idea what can be done : http://playground.arduino.cc/ (click on the left, "Interfacing with hardware").