In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Mr_Nuke wrote:

Peter,

 

I could handle eight simultaneous 8-bit A/D convesions @ 1 KHz and get the raw data, send it to the computer (I have about 33 available ISR cycles every 4th interrupt). The only problem is that I need a 16-bit resolution. Rethinking the system for 8-bit resolution shouldn't be hard, but if I perform the conversion in the same case as the Master processor, several problems arise:

1) I cannot automatically determine the type of sensor that is attached.

2) I cannot tell if the cable will become disconnected.

3) Sending analog values over long distances (2 or more meters in my case) can induce noise.

4) I would have to manually calibrate each sensor.

 

The idea of having a SX control each sensor was that I could avoid all these problems, but, most importantly, have the ability to auto-calibrate each sensor. Although more complex and expensive at design time, It becomes easier to use, and prevents problems, such as connecting a sensor in the wrong place.

 

Yes, it would be possible to do the conversions in the computer, or even master processor, but I prefer the SX/sensor apporach. Imagine having the wrong sensor hooked up, and not realizing it until something goes wrong. It is unlikely, but possible.

 

Sincerely, 
Alex

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=162334#m163080

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)