A Call for A2D Recommendations...
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Posts: 46,084
Hi all,
Well I given up trying to get the MAX186 to work with my BS2 (I only ever get
0.000 or 4.096 Volts as readings!!!). I've been using Shaun Wilsons webpages
(http://geocities.com/SiliconValley/Orchard/6633/max186.html) it's the only
website I could find regarding MAX186 and BS2, but to no avail! Its a shame, as
I managed to get a total of 6 samples of them from Maxim!!
So I'm now after a replacement A2D that I can ideally source in the UK. I was
thinking of using two LTC1298's with the data and clock lines bus'ed together
and then two seperate chip select lines. I've tried to find if Linear Technology
do a 8 channel version of the LTC1298 but I can't quite work out there range!!!
These are all 12 bit but I guess 10 bit will do for what I want...
So anyone got any ideas... like I say ideally that I can get in the UK...
Thanks all, keep up the great work...
Kev/.
[noparse][[/noparse]Non-text portions of this message have been removed]
Well I given up trying to get the MAX186 to work with my BS2 (I only ever get
0.000 or 4.096 Volts as readings!!!). I've been using Shaun Wilsons webpages
(http://geocities.com/SiliconValley/Orchard/6633/max186.html) it's the only
website I could find regarding MAX186 and BS2, but to no avail! Its a shame, as
I managed to get a total of 6 samples of them from Maxim!!
So I'm now after a replacement A2D that I can ideally source in the UK. I was
thinking of using two LTC1298's with the data and clock lines bus'ed together
and then two seperate chip select lines. I've tried to find if Linear Technology
do a 8 channel version of the LTC1298 but I can't quite work out there range!!!
These are all 12 bit but I guess 10 bit will do for what I want...
So anyone got any ideas... like I say ideally that I can get in the UK...
Thanks all, keep up the great work...
Kev/.
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
ground
as the MAX186. I looked at the web-page you suggested along with the code and
although the code doesn't provide much in the way of detail, if you look at
what
it sends to the MAX186 for channel 0.... 142 decimal or (10001110 Binary) this
corresponds to the correct setup for channel 0 according to the datasheet. I
find it difficult to believe that all 6 of your devices are failing, but since
they are all acting the SAME this should be your first clue that this might be
a hardware issue. Once you have confirmed that it is not in software. I would
double check your wiring or even better, build the circuit a second time on
another (separate) bread-board. If you still see the same results, break down
the software code to a more step-by-step over simplistic level until you are
absolutely sure what each line of code is doing and go from there.
Another thought... Are you positive that ALL of your pins on your stamp are
functioning properly? i.e. You haven't fried any lately.
-Beau Schwabe
>Hi all,
>
>Well I given up trying to get the MAX186 to work with my BS2 (I only ever
>get 0.000 or 4.096 Volts as readings!!!). I've been using Shaun Wilsons
>webpages (http://geocities.com/SiliconValley/Orchard/6633/max186.html)
>it's the only website I could find regarding MAX186 and BS2, but to no
>avail! Its a shame, as I managed to get a total of 6 samples of them from
>Maxim!!
>
>So I'm now after a replacement A2D that I can ideally source in the UK. I
>was thinking of using two LTC1298's with the data and clock lines bus'ed
>together and then two seperate chip select lines. I've tried to find if
>Linear Technology do a 8 channel version of the LTC1298 but I can't quite
>work out there range!!! These are all 12 bit but I guess 10 bit will do
>for what I want...
>
>So anyone got any ideas... like I say ideally that I can get in the UK...
>
>Thanks all, keep up the great work...
>
>
>Kev/.
These MAX186s have had me tearing my hair out for over a month now! I've
tried everything.
Two different bread boards, and a lashed up stripboard. My test input is a
4.7K pot across the BoE power rails acting as a potential divider.
I've tried nearly every possible combinations of pins. I even started
labeling wires!!!
There are about four ground interconnections between the various devices.
I've tried pull ups and pull downs on the bus but this just forces the input
to all high or all low.
I've tried with and without hte op-amp input circuit. Still nothing...
I've connected all the unused inputs (4-7) to ground but the debug still
randomly shows some of these
A multimeter shows the clock line is going up and down as it should, but the
stamp never reads any data in.
I'd really like to use the MAX186's, maybe this weekend I take some
pictures/do some diagrams of what I have setup...
I've just bought the LTC1298 app kit from Milford Instruments (20 GBP) and
got it working perfectly in about 10 minutes flat!!!
The kit is just the IC, and one capacitor, manual and a floppy with the
source code on. Very useful for the first one but a bit pricey for building
up projects with.
I guess the very last final thing to try is another Stamp. I only have one
BS2... the basic green one. Would it be worth getting a different one
SX/P??? to try???
Cheers for your input, although at the moment it's only digital and not
analogue!!!!!!! (bad joke I know, sorry all)
Kev/.
Original Message
From: "Beau Schwabe" <bschwabe@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, September 17, 2003 9:56 PM
Subject: Re: [noparse][[/noparse]basicstamps] A Call for A2D Recommendations...
> This almost sounds like your input voltage source is not sharing the same
> ground
> as the MAX186. I looked at the web-page you suggested along with the code
and
> although the code doesn't provide much in the way of detail, if you look
at
> what
> it sends to the MAX186 for channel 0.... 142 decimal or (10001110 Binary)
this
> corresponds to the correct setup for channel 0 according to the datasheet.
I
> find it difficult to believe that all 6 of your devices are failing, but
since
> they are all acting the SAME this should be your first clue that this
might be
> a hardware issue. Once you have confirmed that it is not in software. I
would
> double check your wiring or even better, build the circuit a second time
on
> another (separate) bread-board. If you still see the same results, break
down
> the software code to a more step-by-step over simplistic level until you
are
> absolutely sure what each line of code is doing and go from there.
>
> Another thought... Are you positive that ALL of your pins on your stamp
are
> functioning properly? i.e. You haven't fried any lately.
>
>
> -Beau Schwabe
>
>
> >Hi all,
> >
> >Well I given up trying to get the MAX186 to work with my BS2 (I only ever
> >get 0.000 or 4.096 Volts as readings!!!). I've been using Shaun Wilsons
> >webpages (http://geocities.com/SiliconValley/Orchard/6633/max186.html)
> >it's the only website I could find regarding MAX186 and BS2, but to no
> >avail! Its a shame, as I managed to get a total of 6 samples of them from
> >Maxim!!
> >
> >So I'm now after a replacement A2D that I can ideally source in the UK. I
> >was thinking of using two LTC1298's with the data and clock lines bus'ed
> >together and then two seperate chip select lines. I've tried to find if
> >Linear Technology do a 8 channel version of the LTC1298 but I can't quite
> >work out there range!!! These are all 12 bit but I guess 10 bit will do
> >for what I want...
> >
> >So anyone got any ideas... like I say ideally that I can get in the UK...
> >
> >Thanks all, keep up the great work...
> >
> >
> >Kev/.
>
>
>
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8 different projects without problems, each one hand wired in curcuit
using point to point construction. Double check each connection. You
should be able to measure the reference voltage out from the IC. It
should be 4.096 volts +- a few mv. Also do not exceed this voltage on
any of the analog inputs. Doing so may cause latch up. Be sure that
VSS pin 9 is tied to ground and Pin 10 should be left floating or
pulled high with a 4.7k resistor.
Jason
> Well I given up trying to get the MAX186 to work with my BS2 (I
only ever get 0.000 or 4.096 Volts as readings!!!). I've been using
Shaun Wilsons webpages
(http://geocities.com/SiliconValley/Orchard/6633/max186.html) it's
the only website I could find regarding MAX186 and BS2, but to no
avail! Its a shame, as I managed to get a total of 6 samples of them
from Maxim!!
>
> So I'm now after a replacement A2D that I can ideally source in the
UK. I was thinking of using two LTC1298's with the data and clock
lines bus'ed together and then two seperate chip select lines. I've
tried to find if Linear Technology do a 8 channel version of the
LTC1298 but I can't quite work out there range!!! These are all 12
bit but I guess 10 bit will do for what I want...
>
> So anyone got any ideas... like I say ideally that I can get in the
UK...
>
> Thanks all, keep up the great work...
>
>
> Kev/.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]