Powering arduino + toy motors from LiPo

Hi everbody, nice to be on this forum!

I am a software developer with little to no experience in electronics. Currently I am trying to build a simple robot with arduino as a hobby project.

Here's my plan:

Now so far I have managed to drive the toy motors using a 9V battery, the way it is described in this article: http://www.thebox.myzen.co.uk/Workshop/Motors_1.html.

But since I have the LiPo rider, I would really like to power the whole robot using the LiPo battery. Having the LiPo rider powering only the arduino and keeping an extra 9V battery for the motors doesn't really please me. :~

So I want to ask you: Is there any way I could use the LiPo-battery / -rider to power both the arduino and the two toy motors? If so, can this be done safely, so that the motors cannot interfere with the arduino?

Thanks for taking the time to deal with my noob problem!

http://www.sparkfun.com/products/10171

The motor has an operating voltage range of 1.5 to 4.5VDC

This is the motor you are powering with a 9V battery?

PaulS: http://www.sparkfun.com/products/10171

The motor has an operating voltage range of 1.5 to 4.5VDC

This is the motor you are powering with a 9V battery?

Yes, with a resistor before it. I know I should rather use three AA 1.5V batteries in series, but I don't have a matching case around. Anyway, I need to know if it's somehow possible to go without a second battery and supply both the arduino and the motors safely from the LiPo.

Anyway, I need to know if it's somehow possible to go without a second battery and supply both the arduino and the motors safely from the LiPo.

The motors, yes. The Arduino, maybe.

You haven't said which Arduino you have. The 5V versions need either regulated 5V input to the 5V pin or 7+ volts applied to the power connector. They will operate on less than 7 volts (I use 4 AA batteries in one project to power an Arduino and XBee).

The LiPo shield says that it can provide up to 350mA at 5V, which you should be able to input into the +V pin (and ground).

your motor consumes 320mA with no load (and about 1.2A in load according to the datasheet http://www.sparkfun.com/datasheets/Robotics/hobbymotor.JPG) and your lipo shield can provide about 350mA so im not sure it could handle both motors - you should probably chose a smaller motor or upgrade the power supply or use a different power supply (lipo battery) with a motor shield this can handle 1.2A per channel http://www.sparkfun.com/products/9457