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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...

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

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engineer, fireman, bowler, father, WoW addict ;)

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...

could someone share their SX48 Express PCB Footprint?

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engineer, fireman, bowler, father, WoW addict ;)

thanks for the help guys

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engineer, fireman, bowler, father, WoW addict ;)

bean,
sx/b & sx28

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engineer, fireman, bowler, father, WoW addict ;)

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...

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,...

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 ;)

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

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engineer, fireman, bowler, father, WoW addict ;)

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,...

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...

Thanks Günther.
that was my problem.

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engineer, fireman, bowler, father, WoW addict ;)

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.
...

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 ...

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...

thx peter,

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

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engineer, fireman, bowler, father, WoW addict ;)

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?
...

freewheel diodes are your friend!

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engineer, fireman, bowler, father, WoW addict ;)

thanks mike.

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engineer, fireman, bowler, father, WoW addict ;)

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?
...

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...

thanks bean!

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engineer, fireman, bowler, father, WoW addict ;)

'Watchdog prescale
OPTION = %1111_1100

is this sxB line equivalent?

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engineer, fireman, bowler, father, WoW addict ;)

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...