Thread: accelerometer specs
View Single Post
  #4   Spotlight this post!  
Unread 23-02-2006, 23:02
bush's Avatar
bush bush is offline
Registered User
AKA: Aaron
FRC #0710 (Pine Crest School)
Team Role: Programmer
  
Join Date: Jan 2006
Rookie Year: 2005
Location: Fort Lauderdale, Florida
Posts: 42
bush has a spectacular aura aboutbush has a spectacular aura about
Send a message via AIM to bush
Re: accelerometer specs
Hmm.. if 0g is read at 2500 mV... if mV/g was 125, wouldn't 1g be read at 2625mV?

And that leads my to my next question. For my accelerometer, the sensitivity is is 312mV/g and the 0g bias is 2.5V (specs for supply voltage of 5V). The accelerometer has a range of +/- 2g, so the output voltage should have a range of 2500 +/- 624mV (1876mV - 3124mV).

Isn't the conversion... CODE_VALUE = mV * (1024 / 5000mV)
So my code values should have a range of 512 +/- 127 (385 for -2g and 639 for +2g)?

I know I completely did a 360 from my original understanding (which was apparantley correct?), but I wan't to make sure I completely understand how this is working first. Would somebody explain where my fault is in the logic in this post.