sht-11/71 source?
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Posts: 46,084
I'm trying to find a one-off source for these humidity sensors - preferrably
in Canada though I don't have my hopes up [noparse]:D[/noparse]
I tried the parallax site. $29US each I can handle, but the $50US shipping
to Canada is out of the question.
Original Message
From: "Tracy Allen" <tracy@e...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 8:29 AM
Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
> Hi,
>
> I use dataflash in my loggers. I've never gotten a firm answer about
> the write cycle life (which they call "endurance"). Data
> "retention", which is how long it will hold onto a bit of information
> without refresh, is rated as 10 years. Endurance is not an issue in
> the kind of slow data logging I am doing. They do suggest refreshing
> pages that have not been used for a while, at least once every 10,000
> cycles. For example, if you store some parameters on page 0, and
> then proceed to write to other pages 10000 times, then you should
> come back and refresh page 0. This is all in their app notes and
> FAQs.
>
> -- Tracy
> http://www.emesystems.com/BS2flash.htm
>
> >Has anyone tried out the Dataflash memories from Atmel? I've been
checking
> >the datasheets etc and I can't seem to find what the write cycle life is.
> >Normal flash is usually 10k writes, anyone know what dataflash' is?
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
in Canada though I don't have my hopes up [noparse]:D[/noparse]
I tried the parallax site. $29US each I can handle, but the $50US shipping
to Canada is out of the question.
Original Message
From: "Tracy Allen" <tracy@e...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 8:29 AM
Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
> Hi,
>
> I use dataflash in my loggers. I've never gotten a firm answer about
> the write cycle life (which they call "endurance"). Data
> "retention", which is how long it will hold onto a bit of information
> without refresh, is rated as 10 years. Endurance is not an issue in
> the kind of slow data logging I am doing. They do suggest refreshing
> pages that have not been used for a while, at least once every 10,000
> cycles. For example, if you store some parameters on page 0, and
> then proceed to write to other pages 10000 times, then you should
> come back and refresh page 0. This is all in their app notes and
> FAQs.
>
> -- Tracy
> http://www.emesystems.com/BS2flash.htm
>
> >Has anyone tried out the Dataflash memories from Atmel? I've been
checking
> >the datasheets etc and I can't seem to find what the write cycle life is.
> >Normal flash is usually 10k writes, anyone know what dataflash' is?
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Comments
Sensiron will send you a free sample, if you can mount it yourself. I made a
little board, really easy and works fine.
Jonathan
www.madlabs.info
Original Message
From: "pm" <pmeloy@s...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 10:17 AM
Subject: [noparse][[/noparse]basicstamps] sht-11/71 source?
> I'm trying to find a one-off source for these humidity sensors -
preferrably
> in Canada though I don't have my hopes up [noparse]:D[/noparse]
>
> I tried the parallax site. $29US each I can handle, but the $50US shipping
> to Canada is out of the question.
>
>
>
Original Message
> From: "Tracy Allen" <tracy@e...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, July 03, 2003 8:29 AM
> Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
>
>
> > Hi,
> >
> > I use dataflash in my loggers. I've never gotten a firm answer about
> > the write cycle life (which they call "endurance"). Data
> > "retention", which is how long it will hold onto a bit of information
> > without refresh, is rated as 10 years. Endurance is not an issue in
> > the kind of slow data logging I am doing. They do suggest refreshing
> > pages that have not been used for a while, at least once every 10,000
> > cycles. For example, if you store some parameters on page 0, and
> > then proceed to write to other pages 10000 times, then you should
> > come back and refresh page 0. This is all in their app notes and
> > FAQs.
> >
> > -- Tracy
> > http://www.emesystems.com/BS2flash.htm
> >
> > >Has anyone tried out the Dataflash memories from Atmel? I've been
> checking
> > >the datasheets etc and I can't seem to find what the write cycle life
is.
> > >Normal flash is usually 10k writes, anyone know what dataflash' is?
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
Try: http://www.phanderson.com/ordering_1.html , Mr. Anderson is
really nice and he only charges what is necessary. It only cost me
$1.50 to get a few chips sent. But thats because I live in the US.
I dont think it would cost to much more for him to ship to Canada.
The cost for the SHT71 is: $25US.
Hope this helps,
Harrison
--- In basicstamps@yahoogroups.com, pm <pmeloy@s...> wrote:
> I'm trying to find a one-off source for these humidity sensors -
preferrably
> in Canada though I don't have my hopes up [noparse]:D[/noparse]
>
> I tried the parallax site. $29US each I can handle, but the $50US
shipping
> to Canada is out of the question.
>
>
>
Original Message
> From: "Tracy Allen" <tracy@e...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, July 03, 2003 8:29 AM
> Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
>
>
> > Hi,
> >
> > I use dataflash in my loggers. I've never gotten a firm answer
about
> > the write cycle life (which they call "endurance"). Data
> > "retention", which is how long it will hold onto a bit of
information
> > without refresh, is rated as 10 years. Endurance is not an
issue in
> > the kind of slow data logging I am doing. They do suggest
refreshing
> > pages that have not been used for a while, at least once every
10,000
> > cycles. For example, if you store some parameters on page 0, and
> > then proceed to write to other pages 10000 times, then you should
> > come back and refresh page 0. This is all in their app notes and
> > FAQs.
> >
> > -- Tracy
> > http://www.emesystems.com/BS2flash.htm
> >
> > >Has anyone tried out the Dataflash memories from Atmel? I've
been
> checking
> > >the datasheets etc and I can't seem to find what the write
cycle life is.
> > >Normal flash is usually 10k writes, anyone know what dataflash'
is?
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
This isn't a smart device, it's just a variable capacitor. Not nearly as
elegant as the sht-11/71
I use the 555 based circuit that's in the datasheet to get at the RH.
http://rocky.digikey.com/WebLib/Humirel/HS1101.pdf
If you order it, be sure to order the anciliary resistors for the type of 555 to
be used at the same time!
Don't forget that orders under $32.50 from Digikey have a $6.50 handling charge.
Cheers,
Dave
Original Message
> From: pm
> Subject: [noparse][[/noparse]basicstamps] sht-11/71 source?
> Sent: 03 Jul 2003 12:17:03
>
> I'm trying to find a one-off source for these humidity sensors -
preferrably
> in Canada though I don't have my hopes up [noparse]:D[/noparse]
>
> I tried the parallax site. $29US each I can handle, but the $50US shipping
> to Canada is out of the question.
>
>
>
Original Message
> From: "Tracy Allen"
> To:
> Sent: Thursday, July 03, 2003 8:29 AM
> Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
>
>
> > Hi,
> >
> > I use dataflash in my loggers.··I've never gotten a firm answer about
> > the write cycle life (which they call "endurance").·· Data
> > "retention", which is how long it will hold onto a bit of information
> > without refresh, is rated as 10 years.··Endurance is not an issue in
> > the kind of slow data logging I am doing.··They do suggest refreshing
> > pages that have not been used for a while, at least once every 10,000
> > cycles.··For example, if you store some parameters on page 0, and
> > then proceed to write to other pages 10000 times, then you should
> > come back and refresh page 0.··This is all in their app notes and
> > FAQs.
> >
> >····-- Tracy
> >····http://www.emesystems.com/BS2flash.htm
> >
> > >Has anyone tried out the Dataflash memories from Atmel? I've been
> checking
> > >the datasheets etc and I can't seem to find what the write cycle life
is.
> > >Normal flash is usually 10k writes, anyone know what dataflash' is?
> >
> > To UNSUBSCRIBE, just send mail to:
> >·· basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed.··Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> ··basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.··Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Original Message
[noparse][[/noparse]Non-text portions of this message have been removed]
on that available?
On Thursday, July 3, 2003, at 01:46 PM, Jonathan Peakall wrote:
> PM,
>
> Sensiron will send you a free sample, if you can mount it yourself. I
> made a
> little board, really easy and works fine.
>
> Jonathan
>
> www.madlabs.info
>
>
Original Message
> From: "pm" <pmeloy@s...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, July 03, 2003 10:17 AM
> Subject: [noparse][[/noparse]basicstamps] sht-11/71 source?
>
>
>> I'm trying to find a one-off source for these humidity sensors -
> preferrably
>> in Canada though I don't have my hopes up [noparse]:D[/noparse]
>>
>> I tried the parallax site. $29US each I can handle, but the $50US
>> shipping
>> to Canada is out of the question.
>>
>>
>>
Original Message
>> From: "Tracy Allen" <tracy@e...>
>> To: <basicstamps@yahoogroups.com>
>> Sent: Thursday, July 03, 2003 8:29 AM
>> Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
>>
>>
>>> Hi,
>>>
>>> I use dataflash in my loggers. I've never gotten a firm answer about
>>> the write cycle life (which they call "endurance"). Data
>>> "retention", which is how long it will hold onto a bit of information
>>> without refresh, is rated as 10 years. Endurance is not an issue in
>>> the kind of slow data logging I am doing. They do suggest refreshing
>>> pages that have not been used for a while, at least once every 10,000
>>> cycles. For example, if you store some parameters on page 0, and
>>> then proceed to write to other pages 10000 times, then you should
>>> come back and refresh page 0. This is all in their app notes and
>>> FAQs.
>>>
>>> -- Tracy
>>> http://www.emesystems.com/BS2flash.htm
>>>
>>>> Has anyone tried out the Dataflash memories from Atmel? I've been
>> checking
>>>> the datasheets etc and I can't seem to find what the write cycle
>>>> life
> is.
>>>> Normal flash is usually 10k writes, anyone know what dataflash' is?
>>>
>>> To UNSUBSCRIBE, just send mail to:
>>> basicstamps-unsubscribe@yahoogroups.com
>>> from the same email address that you subscribed. Text in the Subject
> and
>> Body of the message will be ignored.
>>>
>>>
>>> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>>>
>>>
>>
>>
>> To UNSUBSCRIBE, just send mail to:
>> basicstamps-unsubscribe@yahoogroups.com
>> from the same email address that you subscribed. Text in the Subject
>> and
> Body of the message will be ignored.
>>
>>
>> Your use of Yahoo! Groups is subject to
>> http://docs.yahoo.com/info/terms/
>>
>>
>>
>>
>>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject
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>
make traces, and etched it. Then I tinned it well, set my solder pencil
really low, and then heated the taces. I used a right angle SIP header to
connect it to the rest of the circuit. Read the app. notes for important
soldering information.
Jonathan
www.madlabs.info
Original Message
From: "Mark Marpet" <marpetm@s...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 11:07 AM
Subject: Re: [noparse][[/noparse]basicstamps] sht-11/71 source?
> If you made a board to mount the Sensirion sensor, do you have any info
> on that available?
>
> On Thursday, July 3, 2003, at 01:46 PM, Jonathan Peakall wrote:
>
> > PM,
> >
> > Sensiron will send you a free sample, if you can mount it yourself. I
> > made a
> > little board, really easy and works fine.
> >
> > Jonathan
> >
> > www.madlabs.info
> >
> >
Original Message
> > From: "pm" <pmeloy@s...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Thursday, July 03, 2003 10:17 AM
> > Subject: [noparse][[/noparse]basicstamps] sht-11/71 source?
> >
> >
> >> I'm trying to find a one-off source for these humidity sensors -
> > preferrably
> >> in Canada though I don't have my hopes up [noparse]:D[/noparse]
> >>
> >> I tried the parallax site. $29US each I can handle, but the $50US
> >> shipping
> >> to Canada is out of the question.
> >>
> >>
> >>
Original Message
> >> From: "Tracy Allen" <tracy@e...>
> >> To: <basicstamps@yahoogroups.com>
> >> Sent: Thursday, July 03, 2003 8:29 AM
> >> Subject: Re: [noparse][[/noparse]basicstamps] Speaking of logging - Dataflash?
> >>
> >>
> >>> Hi,
> >>>
> >>> I use dataflash in my loggers. I've never gotten a firm answer about
> >>> the write cycle life (which they call "endurance"). Data
> >>> "retention", which is how long it will hold onto a bit of information
> >>> without refresh, is rated as 10 years. Endurance is not an issue in
> >>> the kind of slow data logging I am doing. They do suggest refreshing
> >>> pages that have not been used for a while, at least once every 10,000
> >>> cycles. For example, if you store some parameters on page 0, and
> >>> then proceed to write to other pages 10000 times, then you should
> >>> come back and refresh page 0. This is all in their app notes and
> >>> FAQs.
> >>>
> >>> -- Tracy
> >>> http://www.emesystems.com/BS2flash.htm
> >>>
> >>>> Has anyone tried out the Dataflash memories from Atmel? I've been
> >> checking
> >>>> the datasheets etc and I can't seem to find what the write cycle
> >>>> life
> > is.
> >>>> Normal flash is usually 10k writes, anyone know what dataflash' is?
> >>>
> >>> To UNSUBSCRIBE, just send mail to:
> >>> basicstamps-unsubscribe@yahoogroups.com
> >>> from the same email address that you subscribed. Text in the Subject
> > and
> >> Body of the message will be ignored.
> >>>
> >>>
> >>> Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >>>
> >>>
> >>
> >>
> >> To UNSUBSCRIBE, just send mail to:
> >> basicstamps-unsubscribe@yahoogroups.com
> >> from the same email address that you subscribed. Text in the Subject
> >> and
> > Body of the message will be ignored.
> >>
> >>
> >> Your use of Yahoo! Groups is subject to
> >> http://docs.yahoo.com/info/terms/
> >>
> >>
> >>
> >>
> >>
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
> > and Body of the message will be ignored.
> >
> >
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> >
> >
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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>
sensor.
On Thursday, July 3, 2003, at 02:17 PM, Jonathan Peakall wrote:
> Jonathan Peakall" <jpeakall@m...>
one I preferred too! Once I find out how much he wants for shipping, I'll
give Mr. Peter an order. His just reward for being such a helpfull person [noparse]:D[/noparse]
Original Message
From: "harrisondp" <harrisondp@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 10:47 AM
Subject: [noparse][[/noparse]basicstamps] Re: sht-11/71 source?
> Hello,
>
> Try: http://www.phanderson.com/ordering_1.html , Mr. Anderson is
> really nice and he only charges what is necessary. It only cost me
> $1.50 to get a few chips sent. But thats because I live in the US.
> I dont think it would cost to much more for him to ship to Canada.
> The cost for the SHT71 is: $25US.
>
> Hope this helps,
> Harrison
>
He says that it costs $3.00 shipping for a few ounces to Canada.
That is pretty cheap.
Harrison
--- In basicstamps@yahoogroups.com, pm <pmeloy@s...> wrote:
> Dang, didn't even notice he had those on the site. The '71 is
actually the
> one I preferred too! Once I find out how much he wants for
shipping, I'll
> give Mr. Peter an order. His just reward for being such a helpfull
person [noparse]:D[/noparse]
>
>
Original Message
> From: "harrisondp" <harrisondp@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, July 03, 2003 10:47 AM
> Subject: [noparse][[/noparse]basicstamps] Re: sht-11/71 source?
>
>
> > Hello,
> >
> > Try: http://www.phanderson.com/ordering_1.html , Mr. Anderson is
> > really nice and he only charges what is necessary. It only cost
me
> > $1.50 to get a few chips sent. But thats because I live in the
US.
> > I dont think it would cost to much more for him to ship to
Canada.
> > The cost for the SHT71 is: $25US.
> >
> > Hope this helps,
> > Harrison
> >
in a waterproof flashlight. The SHT went where the lightbulb usually does,
with a runnber boot to seal it off from the body of the flashlight. The lens
was replaced with a fine plastic mesh to keep contamination out.
Hope this is what you menat.
Jonathan
www.madlabs.info
Original Message
From: "Mark Marpet" <marpetm@s...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 03, 2003 11:20 AM
Subject: Re: [noparse][[/noparse]basicstamps] sht-11/71 source?
> Thanks. What I was really thinking about was air circulation around the
> sensor.
>
> On Thursday, July 3, 2003, at 02:17 PM, Jonathan Peakall wrote:
>
> > Jonathan Peakall" <jpeakall@m...>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
eastern US an Canada, and Sensolution is it for the western half.
http://www.sensolution.com
http://www.onsetcomp.com/Products/Product_Pages/Tattletale_pages/sensi
rion.html
If Peter Anderson has it for $25, I would go for that. The single
unit price from the factory rep is $22.
I recently updated my web page at
http://www.emesystems.com/OL2sht1x.htm
to show the '71 (which really does have marvelous flow-through
characteristics), and my encapsulated (slow) version for outdoor use.
I have run across one new precaution that I have not put on the web
page yet. Sensirion has just added this item to their FAQ and it is
not shown in their data sheet or app note. The clock line has to be
at a solid low level when the chip powers up, or else there is a
chance that it will enter a bad locked up state. For example, if you
have the SHTxx powered by the 5 volt Vdd of a Stamp, and have the
data line to a stamp pin with pullup and the clock line to a stamp
pin straight, then the clock line will come up floating when you
power up the stamp, and there is a chance that it will enter this
locked up state. The solution is to add a pulldown (not up!)
resistor to the SHTxx clock line, so that it will always start low.
Or, power the SHTxx from a Stamp pin, and make the clock pin low
before bringing the power high. The power for the SHTxx has to come
up clean and relatively fast.
I have hundreds of these out in the field now, connected as shown in
the data sheet without the pulldown resistor, and most of them have
worked without a hitch. The kicker is the 3 or 4 that have had
trouble and led to an exchange of email with Sensirion. That is
engineering for you.
-- best regards
Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
mailto:tracy@e...
>I made mine to look like the mounted version sold by sensiron. I mounted it
>in a waterproof flashlight. The SHT went where the lightbulb usually does,
>with a runnber boot to seal it off from the body of the flashlight. The lens
>was replaced with a fine plastic mesh to keep contamination out.
>
>Hope this is what you menat.
>
>Jonathan
>
>www.madlabs.info
>
>
Original Message
>From: "Mark Marpet" <marpetm@s...>
>To: <basicstamps@yahoogroups.com>
>Sent: Thursday, July 03, 2003 11:20 AM
>Subject: Re: [noparse][[/noparse]basicstamps] sht-11/71 source?
>
>
>> Thanks. What I was really thinking about was air circulation around the
>> sensor.
>>
>> On Thursday, July 3, 2003, at 02:17 PM, Jonathan Peakall wrote:
>>
>> > Jonathan Peakall" <jpeakall@m...>
>>
>>
>> To UNSUBSCRIBE, just send mail to:
>> basicstamps-unsubscribe@yahoogroups.com
>> from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>>
>>
>> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>>
>>
>>
>>
>>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the
>Subject and Body of the message will be ignored.
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On Thursday, July 3, 2003, at 03:13 PM, Jonathan Peakall wrote:
> I made mine to look like the mounted version sold by sensiron. I
> mounted it
> in a waterproof flashlight. The SHT went where the lightbulb usually
> does,
> with a runnber boot to seal it off from the body of the flashlight.
> The lens
> was replaced with a fine plastic mesh to keep contamination out.
>
> Hope this is what you menat.
>
> Jonathan
>
> www.madlabs.info
>
>
Original Message
> From: "Mark Marpet" <marpetm@s...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, July 03, 2003 11:20 AM
> Subject: Re: [noparse][[/noparse]basicstamps] sht-11/71 source?
>
>
>> Thanks. What I was really thinking about was air circulation around
>> the
>> sensor.
>>
>> On Thursday, July 3, 2003, at 02:17 PM, Jonathan Peakall wrote:
>>
>>> Jonathan Peakall" <jpeakall@m...>
>>
>>
>> To UNSUBSCRIBE, just send mail to:
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