PSN-L Email List Message
Subject: Re: AD7142 ?
From: "James Hannon" jmhannon@.........
Date: Thu, 13 Apr 2006 10:56:59 -0500
I hope this list does not mind the traffic. This sort of stuff is why I am on the list.
My interest started with Dr Peters posts to the list about his capacitive seismograph.
The parts I have are actually AD7747 which is capacitive and allows one side of the capacitor to be grounded. I will be hooking the part up to a DLP2232M http://www.dlpdesign.com/usb/2232m.shtml This will require some windows software to talk to the AD7747 and log the data but all the device driver stuff is already done.
I have looked into using a DSP for a force feedback system. Have the DSP do all the feedback calculations etc. I have talked it over with some DSP experts and we agree it is possible. I am however not sure it is worth the effort.
My current application would not have any feedback and a PC is quite capable of doing what I need to do with the low frequency signals.
My next step is to get some PC board that I can solder the fine pitch part to so I can hook it up.
---------- Original Message ----------------------------------
From: Brett Nordgren
Date: Thu, 13 Apr 2006 11:14:50 -0400
>I'll also reply off list, just to keep the noise level down.
>Are you doing your own digital interface to the USB chip? That's more than
>I'd want to try, but would be interested in what results you get.
>It's clear that I need to learn enough about DSP to build something
>useful. Was wondering if perhaps inserting a DSP chip between the AD7745
>and USB adaptor might not have some advantages.
>I keep having the feeling that there's something in this whole approach
>that's waiting to bite us, but so far haven't been able to figure out what
>it might be.
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