Data acquisition speed

JasonZ

I've been playing with the BS2 stamp for a while now, using it to control position and record force. I've been using the PLX DAQ software to import my data directly into excel. The project is starting to require a much faster data acquisition that what's been previously attained·(~27 stamp loops / second).

I decided to remove the position part of the program, in an effort to speed things up - Now im getting about 37 force readings per second (polling·the ADC chip). Using subroutines in the program just barely slow it down. Some BS2px24 chips are ordered, and I assumed that the 19,000 instructions/sec would have some impact on the speed of the reads.

Is there anything else that can be done? How can I increase the speed at which PLX DAQ records data?

Much hope,
Jason

phil kenny

Try posting your question regarding recording speed of PLX DAQ on the Yahoo
Selmaware group at:

tech.groups.yahoo.com/group/selmaware/?yguid=118350722

phil

JasonZ

Also, would switching to the propeller chip help? Or another DAQ program?

Thanks for the discussion group

Jason

Jason-WI

I have used Hyperterminal and sent text out of a BS2P40 with it comma delimited at high speed and then inport later into Excel. I have done 250 samples a second of a pressure transducer using a PIC16F877 at 20Mhz using PicBasic Pro from MElabs. A Prop should also be able to do high speed data acq as well as the SX using SXB. The BS2PX will get you a few more samples but nowhere near 250.

Jason

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Leon

A PIC24HJ32GP302 will give you 1.1 Msps (10-bits) or 500 Ksps (12-bits).

Leon

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Post Edited (Leon) : 6/17/2009 2:03:20 AM GMT