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Bs2 oem

NewzedNewzed Posts: 2,503
edited 2004-09-14 01:12 in BASIC Stamp
Does the BS2 OEM operate at the same speed as a standard BS2 module - 4000 instructions per second?

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Sid Weaver
Try the Stamp Tester

http://hometown.aol.com/newzed/index.html
·

Comments

  • Jonny555Jonny555 Posts: 46
    edited 2004-09-13 16:43
    Yes, same thing different package
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  • NewzedNewzed Posts: 2,503
    edited 2004-09-13 16:49
    Just for information - I plugged the Stamp Tester into my new BS2 OEM to check it out, and all the pins tested OK; however, the values appear to be a bit lower than for a regular BS2.· On the high side, a low of about 1150, and on the low side, a low of about 275.

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    Sid Weaver
    Try the Stamp Tester

    http://hometown.aol.com/newzed/index.html
    ·
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-09-13 18:21
    Could just be the resonator is a little off...On the OEM Module, I mean...



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    Designs Page:··· http://www.lightlink.com/dream/designs
    ·
  • Tracy AllenTracy Allen Posts: 6,664
    edited 2004-09-13 18:34
    Variation from one stamp to the next is to be expected, due to variations in the resonator and in the threshold value.

    A high resonator frequency would cause both tester readings to be low, as you observed, but 1150 is about 15% lower than the typical value of 1400. That would be way out of tolerance.

    A higher than normal threshold would cause one reading to be lower than normal and the other to be higher than normal, which is not what you observed; both were lower than normal.

    Check your pulsout readings, to verify the timing there, which should be 2 uS per count.

    Is there anything unusual about the wiring, long ground loops, noisy power supply etc.etc?

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    Tracy Allen
    www.emesystems.com
  • NewzedNewzed Posts: 2,503
    edited 2004-09-13 18:51
    I haven't checked PULSOUT yet.The OEM is mounted on a breadboard - power and ground jumpers are about 6 inches long.· The tester is plugged into the OEM breadboard about 1/2" from the OEM.

    On pins 0-7, high is 1212 to 1382, low 292 to 304.

    On pins 8-15, high is 1148 to 1316, low is 280 to 312.

    I let it run for a few minutes, then rechecked 8 to 15.· On the high side, 1254 to1440, on the low side 302 to 334.

    Maybe it just has to run for a bit to settle down.



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    Sid Weaver
    Try the Stamp Tester

    http://hometown.aol.com/newzed/index.html
    ·
  • NewzedNewzed Posts: 2,503
    edited 2004-09-13 19:37
    Tracy, I ran a PULSOUT test on the OEM· I wrote:

    for x = 1 to 50000
    pulsout 15, 1
    next

    I captured a pulse with my Optascope, zoomed in on it, and got a pulse width of 3us.

    Sid
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2004-09-14 01:12
    I dunno Sid...I have used the OEM Stamp 2 in about 4 projects, and soon to be 5 (The Digital Thermostat), and I haven't had any problems related to timing differences...



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    Designs Page:··· http://www.lightlink.com/dream/designs
    ·
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