They're new and a little hidden.
http://www.embeddeddatasystems.com/OW-IO-AI8--Octal-Analog-Input_p_207.html
Support just added in the last release. They have several versions,
including 4 or 8 channels and current or voltage, as well as +/- relays.
Paul
On Sun, Feb 24, 2013 at 1:59 PM, Peter Hollenbeck <[email protected]> wrote:
> Paul,
> I can't find the EDS008X. Can you tell me where to look?
> Thanks,
> Peter
>
> P.S.
> We all appreciate your great work.
> PH
>
>
> On Sun, Feb 24, 2013 at 4:15 AM, Paul Alfille <[email protected]>wrote:
>
>> There are many voltage monitoring chips, including the battery monitors
>> (The DS2438 and DS276X DS277X and DS278X).
>>
>> The DS2438 is used in many designs because it is cheap, easy to work with
>> and can be powered by the battery it is monitoring. (It also measures
>> current and temperature). It's range is 0-10V so you'll need a voltage
>> divider (measure between two large resistors).
>>
>> There are also excellent 3rd party devices like EDS's new EDS008X series
>> with 4 or 8 voltage measurments and the ability to trigger alarms and trip
>> relays. The 1wire bus master is used for recording and setting the
>> parameters, but the monitoring is done by the device's microcontroller.
>>
>> Finally, if you are measuring a computer's voltage, many CPUs generate
>> that data themselves (just look at the BIOS page for "System Health") --
>> though the CPU voltages are usually in the sub 3V range.
>>
>>
>> On Sun, Feb 24, 2013 at 6:24 AM, Attila <[email protected]> wrote:
>>
>>> I tried DS2450 - and decided NEVER use it again.
>>> It is a very low quality AD converter. Read values are jumping very
>>> much, and I could not fix it by oversampling. Even using 100x oversampling
>>> the read voltage was jumping a lot.
>>> Comparing to MCP3008 SLI interface AD converter it is a crap. (MCP3008
>>> is also "jumping " +-1 value, but with 10x times oversampling it can be
>>> fixed quite well - while DS2450 was not able to reach it even with 100x
>>> oversampling)
>>>
>>> Datasheet tells that DS2450 is ONLY a 8 bit AD, 2 least significant bits
>>> arejust a "guess" - take this into consideration as well.
>>>
>>> As I know there are other chips (battery monitor, I can't recall its
>>> name) what can be used for AD conversion on 1wire bus - but I never tried
>>> these
>>>
>>> Attila
>>>
>>>
>>> On Sun, Feb 24, 2013 at 3:37 AM, Peter Hollenbeck <[email protected]>wrote:
>>>
>>>> I wish to sense the voltage in a nominal 12 volt system. I have seen
>>>> the DS2450 recommended and I also see a MS-TV Voltage Sensor from
>>>> iButtonLink.com.
>>>>
>>>> I would appreciate comments and suggestions on a good way to do this
>>>> job.
>>>>
>>>> Is a 1Wire master always required? I have a Hobby Boards serial master
>>>> and it works fine but the voltage sensor will be on a different computer.
>>>>
>>>> Thank you,
>>>> Peter Hollenbeck
>>>> Electronics Ignoramus.
>>>>
>>>>
>>>>
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>>
>>
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