Wiring Diagram for Memsic 2125 -which one?

Steve Joblin

So I am about ready to add a Parallax Memsic 2125 Dual Axis Accelerometer ( http://www.parallax.com/detail.asp?product_id=28017) to my newest creation and noticed that Parallax has two different wiring diagrams in different docuementation... which one is correct?
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Also, the Stamps In Class calls for using resistors between the Stamp and the Memsic... are they needed?

CCraig

I'm using the bottom one with pin 1 a N/C. Works great. I don't think the resistors are needed but couldn't hurt.

HTH, Chris

Steve Joblin

I think that P1 is just for sensing g-force... anyone? anyone?

LSB

There's a tutorial in the "Stamps in Class" sticky's on increasing the accuracy of your readings using the T lead. Also, as I recall, a couple of N&V articles on angle measurements. Good reading for those interested in ALL the capability of this amazing little gob of silicone.

Mark

PS: T has something to do with measuring pulsewidth for increased accuracy and accounting for variations due to temperature extremes--I think. I read the material, but haven't applied it to anything yet.

CCraig

In that same sticky, there is a link to using duty cycle. That leads you here http://forums.parallax.com/showthread.php?p=524815

Andy Lindsay started the post/activity and then Russ Ferguson made some mods on it using some Tracy Allen math routines, then I came along and stole it all. I'm not smart enough to know/understand all the math, but it works great. I made some changes for my project, but it was cut and paste for the most part.

I can't say enough about that article. For me, it's time for a re-look and a good long study.

I just noticed that there is some newer stuff be posted also.



HTH, Chris