Soluition for powering Speakers and raspberry pi (carbattery)

[HylkeT]

Hi im new here and i hope some one could help me with my problem

im working on a school project, we have a raspberry pi with a motion sensor that has a little script that plays a sounds on motion.The problem is that we want to make it stand alone. So we can charge the system en place it annywere we want. We want to try it with a car battery but we dont know how to transform the power to power the speakers and raspberry pi. Because im a noobie at electronics im not sure what to do.

My main qeustion is if the car battery is a good solution, and how we transform the power to connect it to our raspberry and speakers. maby you guys know a better way to power both the speakers and the raspberry pi for at leas 8 hours. We dont got a big budget so it would be cool if its cheap aswell.

I hope some one can help me.

Greetings Hylke T

 

[Joemzkie]

Can you please give the Specification of your items.
Like voltage ratings or etc.

 

[HylkeT]

Thnx for your reaction, here are the specifications on the products were using.

Car battery


Logitech Speakers Z200

 Totaal Watts: 5W RMS/10W peak
 Driver grote: 2,5”
 Amplificatie type – Actief
 AMP – Geintegreerd
 (wired)
 Controls – Stroom aan/uit, Tone, Volume
 Frequentie – 80 Hz tot 20 Khz
 Maximale output SPL MAX – 88DB

Accessoires:
 AC Power adapter cable: 1.8m 230Volt

Raspberry pi B
Raspberry Pi Model B 1.2A 500mA 500mA

We asked some people at school and the said the speakers are gonna be a problem to power with the carbattery, maby some one here knows speakers that dont use a lot of power and are cheap to use.

Im looking forward to your reaction!

 

[Joemzkie]

If I'm not mastaken, raspberry pi only need 5volts, so in the raspberry itself you need a step down voltage regulator from 12volts to 5volts.

On speakers, you can look for more cheaper one, like some old Desktop Speakers that also consumes 5volts, or you can build one (http://www.instructables.com/id/LM386-Audio-Amplifier)


Step Down Power Regulator 12volts to 5volts.