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Data acquisition speed — Parallax Forums

Data acquisition speed

JasonZJasonZ Posts: 2
edited 2009-06-16 23:04 in Accessories
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

Comments

  • phil kennyphil kenny Posts: 233
    edited 2009-06-15 13:39
    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
  • JasonZJasonZ Posts: 2
    edited 2009-06-15 14:37
    Also, would switching to the propeller chip help? Or another DAQ program?

    Thanks for the discussion group

    Jason
  • Jason-WIJason-WI Posts: 35
    edited 2009-06-16 21:22
    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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  • LeonLeon Posts: 7,620
    edited 2009-06-16 23:04
    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
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