humidity and temperature sensors

C

C3

Guest
I'd like to connect two temperature and humidity sensors to my PC and to
write some software to take action on the basis of these. Can anybody
recommend a decent product?

Since I only have one free serial port, each temperature sensor would have
to be together with the humidity sensor. Alternatively, I could live with a
parallel port unit that allowed me to connect a number of temperature and
humidity sensors (this would actually be preferred). Also, I'd prefer not to
have to buy a CPU/motherboard fan and start ripping it to bits.

I don't have a PIC programmer unfortunately...

Does anyone else have a temp/humidity setup on their PC?

C3
 
On Thu, 22 Jan 2004 18:16:12 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:
I'd like to connect two temperature and humidity sensors to my PC and to
write some software to take action on the basis of these. Can anybody
recommend a decent product?

Since I only have one free serial port, each temperature sensor would have
to be together with the humidity sensor. Alternatively, I could live with a
parallel port unit that allowed me to connect a number of temperature and
humidity sensors (this would actually be preferred). Also, I'd prefer not to
have to buy a CPU/motherboard fan and start ripping it to bits.

I don't have a PIC programmer unfortunately...

Does anyone else have a temp/humidity setup on their PC?

C3
Click to expand...
Farnell (UK site, but could most likely order it here) have a nice
little surface mount temperature and humidity chip that interfaces
serially. The SHT-11 from memory. If you need a direct link, let me
know.

Regards
Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
Sounds good! I'm just worried about what I'm going to do when I upgrade my
PCs and they don't have serial ports.

cheers,

C3

Farnell (UK site, but could most likely order it here) have a nice
little surface mount temperature and humidity chip that interfaces
serially. The SHT-11 from memory. If you need a direct link, let me
know.
Click to expand...
 
Sensiron have a digital output humidity sensor that could be worth looking
at.
Dave

"C3" <gned@telsMONOPOLYtra.com> wrote in message
news:400f789e$0$26114$afc38c87@news.optusnet.com.au...
I'd like to connect two temperature and humidity sensors to my PC and to
write some software to take action on the basis of these. Can anybody
recommend a decent product?

Since I only have one free serial port, each temperature sensor would have
to be together with the humidity sensor. Alternatively, I could live with
a
parallel port unit that allowed me to connect a number of temperature and
humidity sensors (this would actually be preferred). Also, I'd prefer not
to
have to buy a CPU/motherboard fan and start ripping it to bits.

I don't have a PIC programmer unfortunately...

Does anyone else have a temp/humidity setup on their PC?

C3
Click to expand...
 
On Thu, 22 Jan 2004 20:00:12 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:

Sounds good! I'm just worried about what I'm going to do when I upgrade my
PCs and they don't have serial ports.
Click to expand...
Get a USB to serial converter.

Anyway, these devices aren't RS232, they are a 2 wire digital
interface, probably an I2C bus or similar. Farnell 391-3065

If the

Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
The specs look very good, but there are two problems. Firstly, it's not in
the Australian Farnell catalogue, and secondly, it's almost 11 pounds. I can
easily see it getting to $50 here.

I was looking for something a bit cheaper. Am I being unreasonable? How much
does it cost to produce an integrated temperature/humidity sensor with some
sort of digital output?

All in all, I'd love to buy this unit, but it's simply too expensive for
what I'll be using it for.

cheers,

C3

"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400f97e1.5880649@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 20:00:12 +1100, "C3" <gned@telsMONOPOLYtra.com
wrote:

Sounds good! I'm just worried about what I'm going to do when I upgrade
my
PCs and they don't have serial ports.

Get a USB to serial converter.

Anyway, these devices aren't RS232, they are a 2 wire digital
interface, probably an I2C bus or similar. Farnell 391-3065

If the

Dave :)
Click to expand...
 
It seems to be a very nice product. Can I still use it if I don't have the
tools to etch a PCB?

cheers,

C3

"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400f97e1.5880649@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 20:00:12 +1100, "C3" <gned@telsMONOPOLYtra.com
wrote:

Sounds good! I'm just worried about what I'm going to do when I upgrade
my
PCs and they don't have serial ports.

Get a USB to serial converter.

Anyway, these devices aren't RS232, they are a 2 wire digital
interface, probably an I2C bus or similar. Farnell 391-3065

If the

Dave :)
---------------------------
(remove the "_" from my email address to reply)
Click to expand...
 
On Thu, 22 Jan 2004 21:06:52 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:
The specs look very good, but there are two problems. Firstly, it's not in
the Australian Farnell catalogue, and secondly, it's almost 11 pounds. I can
easily see it getting to $50 here.

I was looking for something a bit cheaper. Am I being unreasonable? How much
does it cost to produce an integrated temperature/humidity sensor with some
sort of digital output?

All in all, I'd love to buy this unit, but it's simply too expensive for
what I'll be using it for.

cheers,

C3
Click to expand...
Your problem is the humidy sensor. Temp sensors are cheap and easy,
humidity is a bit harder. Can't say I've really looked for humidy
sensors before though, so there may be something out there. But if you
are talking small volume then it's probably going to cost you.

Farnell Australia should be able to get it for you in next to no time,
just use the UK part number. That way you won't pay freight from the
UK.
Check the other parts in the same SHT range, there may be a cheaper
lower spec version or something.

Perhaps you can buy one of those cheap chinise made temp/humidity LCD
things and use the sensor out of that some how? It's not likely to be
marked though, so this won't make things easy.

Regards
Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
On Thu, 22 Jan 2004 21:06:52 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:

The specs look very good, but there are two problems. Firstly, it's not in
the Australian Farnell catalogue, and secondly, it's almost 11 pounds. I can
easily see it getting to $50 here.

I was looking for something a bit cheaper. Am I being unreasonable? How much
does it cost to produce an integrated temperature/humidity sensor with some
sort of digital output?

All in all, I'd love to buy this unit, but it's simply too expensive for
what I'll be using it for.

cheers,

C3
Click to expand...
Digikey have a few humidy sensors:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=5872&Site=US&Cat=32375564

Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
On Thu, 22 Jan 2004 21:52:12 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:
It seems to be a very nice product. Can I still use it if I don't have the
tools to etch a PCB?

cheers,

C3
Click to expand...
Shouldn't be too hard. You could sit the device on top of say an 8 pin
machine IC socket and solder a small wire to each pin. I'd then pot
the thing to make it robust. Alternatively, solder a wire to each pad
and connect to a flying lead connector, and once again pot everything.

What specs do you need?
The SHT11 has pretty good resolution and accuracy, so if you want good
specs you may have to pay the price.

Regards
Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
http://arm.web7days.com/temp_linux.jpg

http://arm.web7days.com/temp_measure.gif

may be you try this DS 1621

HTH.
 
"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400fc457.17264093@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 21:06:52 +1100, "C3" <gned@telsMONOPOLYtra.com
Click to expand...
<snip>

Your problem is the humidy sensor. Temp sensors are cheap and easy,
humidity is a bit harder. Can't say I've really looked for humidy
sensors before though, so there may be something out there. But if you
are talking small volume then it's probably going to cost you.
Click to expand...
<snip>

Research wet-dry bulbs. Two temp sensors, one wet, one dry. Its relatively
trivial to calculate RH with this configuration. Nice and cheap too, all you
have to do is top it up with distilled water ever now and then.

Andy
 
The SHT11 is available on a 6 pin carrier from Parallax the Basic Stamp
people, for about U$30.00.

If you want a Pic based version, then I have a circuit, that was going to be
published in N&V, but I think it's on the 'special' intray at this moment.

As far as using a PC then you could use the example C file from Sensirions
website and just add in the PC serial bits.

It uses a non standard I2C protocol.

Colin

"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400f857b.1170064@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 18:16:12 +1100, "C3" <gned@telsMONOPOLYtra.com
wrote:
I'd like to connect two temperature and humidity sensors to my PC and to
write some software to take action on the basis of these. Can anybody
recommend a decent product?

Since I only have one free serial port, each temperature sensor would
have
to be together with the humidity sensor. Alternatively, I could live with
a
parallel port unit that allowed me to connect a number of temperature and
humidity sensors (this would actually be preferred). Also, I'd prefer not
to
have to buy a CPU/motherboard fan and start ripping it to bits.

I don't have a PIC programmer unfortunately...

Does anyone else have a temp/humidity setup on their PC?

C3

Farnell (UK site, but could most likely order it here) have a nice
little surface mount temperature and humidity chip that interfaces
serially. The SHT-11 from memory. If you need a direct link, let me
know.

Regards
Dave :)
---------------------------
(remove the "_" from my email address to reply)
Click to expand...
 
Shouldn't be too hard. You could sit the device on top of say an 8 pin
machine IC socket
Click to expand...
Would you be able to describe this device in more details?

and solder a small wire to each pin.
Click to expand...
That's probably what I'll end up doing.

I'd then pot the thing to make it robust.
Click to expand...
Do you mean connect it to a potentiometer? What is this for?

Alternatively, solder a wire to each pad
and connect to a flying lead connector, and once again pot everything.
Click to expand...
I don't understand what this means.

What specs do you need?
Click to expand...
Not very detailed ones. I will be measuring the temperature inside a room.
It gets hot and humid, but nothing too extreme. More accuracy is always
nice, though. If this chip turns out to be easy to interface, I'll probably
buy it.

cheers,

C3
 
On Fri, 23 Jan 2004 19:08:29 +1100, "C3" <gned@telsMONOPOLYtra.com>
wrote:

Shouldn't be too hard. You could sit the device on top of say an 8 pin
machine IC socket

Would you be able to describe this device in more details?
Click to expand...
http://www.aukconnector.com/object/photo/2907.jpg
That is a 6 pin version though.
You can buy these at any electronics store like Jaycar, DSE etc
Probably only useful if you are going to plug/solder the device onto a
PCB or Veroboard.

and solder a small wire to each pin.

That's probably what I'll end up doing.

I'd then pot the thing to make it robust.

Do you mean connect it to a potentiometer? What is this for?
Click to expand...
By "pot" I mean potting compound. It is an encapsulant liquid wich
sets hard and covers your module, wiring, solder joints etc. So you
could create a solid "block" with your sensor inside and just wires
coming out. This might muck up the humidity sensor though, don't know,
you'd have to check.
Hot Melt glue is an easy and cheap for of "potting" also.

Alternatively, solder a wire to each pad
and connect to a flying lead connector, and once again pot everything.

I don't understand what this means.

What specs do you need?

Not very detailed ones. I will be measuring the temperature inside a room.
It gets hot and humid, but nothing too extreme. More accuracy is always
nice, though. If this chip turns out to be easy to interface, I'll probably
buy it.
Click to expand...
If you just want to measure and log temperature, then take a look at
the ThermoChron iButton from Dallis Semiconductor. Magic little
things. Too bad they don't make a humidy sensor version.

Regards
Dave :)
---------------------------
(remove the "_" from my email address to reply)
 
"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400fc457.17264093@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 21:06:52 +1100, "C3" <gned@telsMONOPOLYtra.com
wrote:
The specs look very good, but there are two problems. Firstly, it's not
in
the Australian Farnell catalogue, and secondly, it's almost 11 pounds. I
can
easily see it getting to $50 here.

I was looking for something a bit cheaper. Am I being unreasonable? How
much
does it cost to produce an integrated temperature/humidity sensor with
some
sort of digital output?

All in all, I'd love to buy this unit, but it's simply too expensive for
what I'll be using it for.

cheers,

C3

Your problem is the humidy sensor. Temp sensors are cheap and easy,
humidity is a bit harder. Can't say I've really looked for humidy
sensors before though, so there may be something out there. But if you
are talking small volume then it's probably going to cost you.

Farnell Australia should be able to get it for you in next to no time,
just use the UK part number. That way you won't pay freight from the
UK.
Check the other parts in the same SHT range, there may be a cheaper
lower spec version or something.

Perhaps you can buy one of those cheap chinise made temp/humidity LCD
things and use the sensor out of that some how? It's not likely to be
marked though, so this won't make things easy.

Regards
Dave :)
Click to expand...
a cheap one costs around Aus$10 - 20.

http://www.futurlec.com.au/Sensors.jsp
http://www.futurlec.com/Sensors.shtml (has the price unlike Aus page)
US$14.50

or www.kitsrus.com/bits.html
Philips Humidity sensor 2322 691 90001. US$9.50
http://www.kitsrus.com/pdf/humidity.pdf

Alex
 
Scrapped digital photocopiers might be a good place to find humidity / temp
sensors. Interfacing could be a bit of a problem though.

James


"C3" <gned@telsMONOPOLYtra.com> wrote in message
news:400fab3f$0$26119$afc38c87@news.optusnet.com.au...
It seems to be a very nice product. Can I still use it if I don't have the
tools to etch a PCB?

cheers,

C3

"David L. Jones" <tronnort_@yahoo.com> wrote in message
news:400f97e1.5880649@News.CIS.DFN.DE...
On Thu, 22 Jan 2004 20:00:12 +1100, "C3" <gned@telsMONOPOLYtra.com
wrote:

Sounds good! I'm just worried about what I'm going to do when I upgrade
my
PCs and they don't have serial ports.

Get a USB to serial converter.

Anyway, these devices aren't RS232, they are a 2 wire digital
interface, probably an I2C bus or similar. Farnell 391-3065

If the

Dave :)
---------------------------
(remove the "_" from my email address to reply)
Click to expand...
 
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