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Electronics => Electronics => Topic started by: Dscrimager on December 06, 2008, 12:03:34 PM

Title: Dumb question on 5V versus 3.3 Volt devices and AXON
Post by: Dscrimager on December 06, 2008, 12:03:34 PM

I want to interface an ADXL330 triple axis accelerometer to my AXON for my 'bot.

Now my question is, as long as I power this board from the 3.3V source on the AXON I can still sample the accelerometer ouput pins with the regular AXON ADC pins correct? I would just see values that are from 0 - 3.3 Volts versus going up to 5 volts?

I did a little searching but didn't find anything about this....

Doug

Title: Re: Dumb question on 5V versus 3.3 Volt devices and AXON
Post by: Dscrimager on December 06, 2008, 01:47:13 PM

I just found the answer in the header files... basically what I thought was true...power from 3.3 header and read from normal ADC pin,...

Doug

Title: Re: Dumb question on 5V versus 3.3 Volt devices and AXON
Post by: pomprocker on December 07, 2008, 01:53:29 AM

I don't think you can use 3.3v to power the Axon when it is running at 16MHz

Title: Re: Dumb question on 5V versus 3.3 Volt devices and AXON
Post by: Admin on December 07, 2008, 03:25:46 AM

Dscrimager, yeap you are correct.

pomprocker, he means the 3.3V output on the Axon ;D

This device also uses the ADXL330, just in case you wanted something off the shelf:
http://www.dimensionengineering.com/DE-ACCM3D.htm