Newbie Question: Arduino Uno and MMA7260Q

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi guys,

I have an Arduino Uno and a MMA7260Q Accelerometer. I'm a newb with all of this stuff and I'm trying to get started.

Basically, I'm very unfamiliar with the arduino and what I need is 3.3 volts power from arduino to power the MMA7260Q as well as a ground for the 3.3V. I'm pretty sure I also need to hook up the sleep pin on the MMA7260Q to a 3.3 V source so that it doesnt go into sleep mode.

Can I get 3.3 volts from the Arduino board even if its being powered by USB or some other source?

Probably the most basic of questions but you gotta start somewhere!

Thank you!

2

Probably the most basic of questions but you gotta start somewhere!

You could always start by looking at your Arduino. Hold it so that the Made in Italy text is right side up. Now look at the lower edge of the board. Right there between reset and 5V. What does it say?

Maximum current allowed is 50mA.

3

I was under the impression those were for power in!

My bad.

I tried powering an easydriver stepper motor driver with the 5V of those pins a few days ago and couldn't get it to work, thats why I figured they were power ins for the board and not outs.

Well don't I feel stupid now :-[ lol thanks for the help!

4

Oh, and does it matter which ground I connect it to? There are two grounds there...

5

There are two grounds there.

No. There are two place you can plug into (on that side) labeled ground. They are all tied together.

6

Thanks for the patience. I have it working now :slight_smile:

Now to code it to work with the easy driver!