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Type: Posts; User: nick bernard

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  1. your coils could be producing a flyback voltage....

    your coils could be producing a flyback voltage. try placing a diode across the dc coils; anode to negative, cathode to positive.

    also your coils could be producing an emf. if the flyback diode...
  2. thx sparks, i incorrectly assumed the logo and...

    thx sparks, i incorrectly assumed the logo and text was gospel. oops

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    engineer, fireman, bowler, father, WoW addict ;)
  3. sx48 and a "vpp generation failed" error msg

    i checked out a previous thread http://forums.parallax.com/forums/default.aspx?f=7&m=139996&g=140150#m140150

    my +5vdc seems fine, my header is identical to serveral other successful projects, and...
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    SX48 Express PCB Footprint?

    could someone share their SX48 Express PCB Footprint?

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    engineer, fireman, bowler, father, WoW addict ;)
  5. thanks for the help guys ...

    thanks for the help guys

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    engineer, fireman, bowler, father, WoW addict ;)
  6. bean, sx/b & sx28 ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔...

    bean,
    sx/b & sx28

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    engineer, fireman, bowler, father, WoW addict ;)
  7. sx internal memory vs fram for a 96 byte array

    hail.

    i've come to an xroads in my project and i could use some advice.

    my application requires a 96 byte array which are updated roughly 10 times a second.
    i dont have much experience with...
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    woo woo, i found the problem. it was hardware...

    woo woo,
    i found the problem. it was hardware related.
    i assembled another pcb with a hotplate reflow & solder paste and it works fine
    tyvm guys!

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    engineer, fireman,...
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    here's my *.sch and *.pcb cropped into a *.jpg ...

    here's my *.sch and *.pcb cropped into a *.jpg

    i'm using 2.2k pullups

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    engineer, fireman, bowler, father, WoW addict ;)
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    i have a demo board but the frams are soic-8. ...

    i have a demo board but the frams are soic-8.

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    engineer, fireman, bowler, father, WoW addict ;)
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    actually i have 2 frams on 1 i2c network...

    actually i have 2 frams on 1 i2c network addressed 0 and 1
    mouser. they have a few readily available.

    arg so i have a hardware problem!

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    engineer, fireman, bowler,...
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    FM24C64 I2C help

    i'm have trouble with my read write routines with my first I2C external memorty application.

    i got the code from the sx/b help file but its not working.

    any help?
    tech doc...
  13. View Post

    Thanks GŁnther.
    that was my problem.

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    engineer, fireman, bowler, father, WoW addict ;)
  14. programming error msg "programming failed"

    what event promps the display "programming failed" w/ sk-key v3.10.

    the message comes up after the device operation msg box displays programming... and the progress bar is full.
    ...
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    HTH, you're my savior, that algorithm is sweet....

    HTH, you're my savior, that algorithm is sweet. i'll have to read up on log algorithms bc that seems to be some powerful juju.
    this is my revised procedure.

    Gray_To_Binary_Log:
    cx = __PARAM1 ...
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    graycode to binary code

    continuing from
    http://forums.parallax.com/forums/default.aspx?f=15&m=146166

    how does this look? could it be more concise? i always have trouble juggling bits with asm and i could use some help...
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    thx peter, now to put it into sxb. i'll post...

    thx peter,

    now to put it into sxb.
    i'll post in that forum.

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    engineer, fireman, bowler, father, WoW addict ;)
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    greycode to binary algorithm

    http://mathworld.wolfram.com/GrayCode.html

    the above link is a good source and gives a formula for converting graycode into binary.

    can you help me turn the fromula into an algorithm?
    ...
  19. freewheel diodes are your friend! ...

    freewheel diodes are your friend!

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    engineer, fireman, bowler, father, WoW addict ;)
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    thanks mike. ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔...

    thanks mike.

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    engineer, fireman, bowler, father, WoW addict ;)
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    bypass cap value

    i usually place a 1uf cap between vdd and vss on all my SX applications very near the SX28. but i'm out of 1uf caps in that case size (2mm pitch).

    can i use 22uf caps in their place?
    ...
  22. Thread: Rs232-485

    by nick bernard
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    jerry are you trying to send a byte variable...

    jerry are you trying to send a byte variable (0-255) in a single character in a sentence?

    i find using 2 characters ("0" to "F" fetched in a lookup table) to transmit data over a serial interface...
  23. thanks bean! ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔...

    thanks bean!

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    engineer, fireman, bowler, father, WoW addict ;)
  24. 'Watchdog prescale OPTION = %1111_1100 is...

    'Watchdog prescale
    OPTION = %1111_1100

    is this sxB line equivalent?

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    engineer, fireman, bowler, father, WoW addict ;)
  25. setting !option for a watchdog in an sxB program

    i've never used a watchdog timer before and i'm having trouble
    this snippet is giving me compilation errors in the src file. any help?

    program is attached

    thanks guys
    nick

    'Watchdog...
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