freezer temp warning
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Posts: 46,084
After my large freezer died last night, I want to make a temp sensor
that will beep or flash a light when the temperature rises above 20
or 30 degrees. I need to know what sensors will work, where to get
them, and some help coding (its been awhile since I played with my
basic stamp...) I have a basic stamp 2, but I think thats kind of
over kill just for a temp sensor, so I might get a basic stamp 1 to
do this.
Tad Heckaman
that will beep or flash a light when the temperature rises above 20
or 30 degrees. I need to know what sensors will work, where to get
them, and some help coding (its been awhile since I played with my
basic stamp...) I have a basic stamp 2, but I think thats kind of
over kill just for a temp sensor, so I might get a basic stamp 1 to
do this.
Tad Heckaman
Comments
tad@h... writes:
> After my large freezer died last night, I want to make a temp sensor
> that will beep or flash a light when the temperature rises above 20
> or 30 degrees. I need to know what sensors will work, where to get
> them, and some help coding (its been awhile since I played with my
> basic stamp...) I have a basic stamp 2, but I think thats kind of
> over kill just for a temp sensor, so I might get a basic stamp 1 to
> do this.
>
Good morning Tad
An Lm34DZ hooked up to an ADC will will do the job nicely. I use the
TLC2543, an 11-channel 12-bit ADC. Overkill probably, but it seems to be
chaper than a 4-channel ADC. If I can help with the code let me know.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
easy code, have your alarm system up and going in an hour or so. You can
purchase the DS1620 from Parallax.
-- Jon Williams
-- Parallax
In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
tad@h... writes:
> After my large freezer died last night, I want to make a temp sensor
> that will beep or flash a light when the temperature rises above 20
> or 30 degrees. I need to know what sensors will work, where to get
> them, and some help coding (its been awhile since I played with my
> basic stamp...) I have a basic stamp 2, but I think thats kind of
> over kill just for a temp sensor, so I might get a basic stamp 1 to
> do this.
>
>
[noparse][[/noparse]Non-text portions of this message have been removed]
they would work better, since they have wires on them, not a single
chip. The freezer would have alot of water and condensation, so I
would think a chip would rust and fail after a few weeks. Would those
other ones be just as easy to hook up? Or I could put my whole
project inside a waterproof box and freeze the whole thing, but I
dont know if the basicstamp would work at -20 degrees.
--- In basicstamps@y..., jonwms@a... wrote:
> You could connect a DS1620 directly to the BASIC Stamp and with
some really
> easy code, have your alarm system up and going in an hour or so.
You can
> purchase the DS1620 from Parallax.
>
> -- Jon Williams
> -- Parallax
>
> In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
> tad@h... writes:
>
>
> > After my large freezer died last night, I want to make a temp
sensor
> > that will beep or flash a light when the temperature rises above
20
> > or 30 degrees. I need to know what sensors will work, where to
get
> > them, and some help coding (its been awhile since I played with
my
> > basic stamp...) I have a basic stamp 2, but I think thats kind of
> > over kill just for a temp sensor, so I might get a basic stamp 1
to
> > do this.
> >
> >
>
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
just for the job.
--- In basicstamps@y..., goflo@p... wrote:
> I've done a similar thing with a water heater using a thermistor
> & capacitor as described in the BS1 apps - Beeps a piezo at desired
> temp.
> If the controller is'nt in the freezer you'll find the set point
> drifts quite a bit with variation in ambient temp - If this is'nt
> acceptable another sensor can sense ambient so the pgm can compute
> a suitable offset, or you could do something sneaky like measure
> the cycle time of the AC line and compare the measurement with the
> actual time.
>
> regards, Jack
>
> p.s. - Mouser, Digikey, Jameco, & a BS1 is plenty.
STAMP to do this at all. Just get a temp sensor like the LM34
(available at parallax) and a comparitor like the LM339 quad
comparitor. Hook up the sensor to the comparitor, adjust it to the
correct voltage and connect the output to a light and you are done.
It will cost you about 10 dollars or less.
And, if you wanted to do something fancy you could take all four
comparitors in the LM339 package and create a 4 LED bar graph (maybe
three yellow and one red). And, hook up some sort of alarm on the
red one.
STAMP's are great but many times we use them as a crutch when it is
not necessary.
--- In basicstamps@y..., "tadheckaman" <tad@h...> wrote:
> After my large freezer died last night, I want to make a temp
sensor
> that will beep or flash a light when the temperature rises above 20
> or 30 degrees. I need to know what sensors will work, where to get
> them, and some help coding (its been awhile since I played with my
> basic stamp...) I have a basic stamp 2, but I think thats kind of
> over kill just for a temp sensor, so I might get a basic stamp 1 to
> do this.
>
> Tad Heckaman
chip... and its cheap!
--- In basicstamps@y..., "dirt939" <stamp@d...> wrote:
> I know this is a BASIC STAMP message board but I would not use a
> STAMP to do this at all. Just get a temp sensor like the LM34
> (available at parallax) and a comparitor like the LM339 quad
> comparitor. Hook up the sensor to the comparitor, adjust it to the
> correct voltage and connect the output to a light and you are done.
> It will cost you about 10 dollars or less.
>
> And, if you wanted to do something fancy you could take all four
> comparitors in the LM339 package and create a 4 LED bar graph
(maybe
> three yellow and one red). And, hook up some sort of alarm on the
> red one.
>
> STAMP's are great but many times we use them as a crutch when it is
> not necessary.
>
> --- In basicstamps@y..., "tadheckaman" <tad@h...> wrote:
> > After my large freezer died last night, I want to make a temp
> sensor
> > that will beep or flash a light when the temperature rises above
20
> > or 30 degrees. I need to know what sensors will work, where to
get
> > them, and some help coding (its been awhile since I played with
my
> > basic stamp...) I have a basic stamp 2, but I think thats kind of
> > over kill just for a temp sensor, so I might get a basic stamp 1
to
> > do this.
> >
> > Tad Heckaman
need a heat sink? [noparse];)[/noparse] but I am not quite to the point of making my own
basic stamp... even though I am thinking of making my own robot with
a laptop as its controller...
--- In basicstamps@y..., goflo@p... wrote:
> Or buy the interpreter chip from Parallax & roll your own.
> Cheap & lets you diddle the clock to suit the app.
>
> Or, if you've got one of the old Parallax 16CXX pgmrs, stuff
> the interpreter & pgm into a 16C58 - Mo' cheapa yet, plus
> there are 40 MHz '58s these days, if you need a screaming BS1 [noparse]:)[/noparse]
>
> regards, Jack
>
> tadheckaman wrote:
> >
> > This sounds like a good idea too, I would be willing to buy a BS1
> > just for the job.
> >
> > --- In basicstamps@y..., goflo@p... wrote:
> > > I've done a similar thing with a water heater using a thermistor
> > > & capacitor as described in the BS1 apps - Beeps a piezo at
desired
> > > temp.
> > > If the controller is'nt in the freezer you'll find the set point
> > > drifts quite a bit with variation in ambient temp - If this
is'nt
> > > acceptable another sensor can sense ambient so the pgm can
compute
> > > a suitable offset, or you could do something sneaky like measure
> > > the cycle time of the AC line and compare the measurement with
the
> > > actual time.
> > >
> > > regards, Jack
> > >
> > > p.s. - Mouser, Digikey, Jameco, & a BS1 is plenty.
& capacitor as described in the BS1 apps - Beeps a piezo at desired
temp.
If the controller is'nt in the freezer you'll find the set point
drifts quite a bit with variation in ambient temp - If this is'nt
acceptable another sensor can sense ambient so the pgm can compute
a suitable offset, or you could do something sneaky like measure
the cycle time of the AC line and compare the measurement with the
actual time.
regards, Jack
p.s. - Mouser, Digikey, Jameco, & a BS1 is plenty.
the LM34
https://www.jameco.com/cgi-bin/ncommerce3/ProductDisplay?
prmenbr=91&prrfnbr=2802&cgrfnbr=501&ctgys=
and the LM339
https://www.jameco.com/cgi-bin/ncommerce3/ProductDisplay?
prmenbr=91&prrfnbr=353083&cgrfnbr=501&ctgys=
Would this need any special resisters and capasitors, or is there a
scematic or this somewhere that I could look it up.
Thanks
--- In basicstamps@y..., "dirt939" <stamp@d...> wrote:
> I know this is a BASIC STAMP message board but I would not use a
> STAMP to do this at all. Just get a temp sensor like the LM34
> (available at parallax) and a comparitor like the LM339 quad
> comparitor. Hook up the sensor to the comparitor, adjust it to the
> correct voltage and connect the output to a light and you are done.
> It will cost you about 10 dollars or less.
>
> And, if you wanted to do something fancy you could take all four
> comparitors in the LM339 package and create a 4 LED bar graph
(maybe
> three yellow and one red). And, hook up some sort of alarm on the
> red one.
>
> STAMP's are great but many times we use them as a crutch when it is
> not necessary.
>
> --- In basicstamps@y..., "tadheckaman" <tad@h...> wrote:
> > After my large freezer died last night, I want to make a temp
> sensor
> > that will beep or flash a light when the temperature rises above
20
> > or 30 degrees. I need to know what sensors will work, where to
get
> > them, and some help coding (its been awhile since I played with
my
> > basic stamp...) I have a basic stamp 2, but I think thats kind of
> > over kill just for a temp sensor, so I might get a basic stamp 1
to
> > do this.
> >
> > Tad Heckaman
Cheap & lets you diddle the clock to suit the app.
Or, if you've got one of the old Parallax 16CXX pgmrs, stuff
the interpreter & pgm into a 16C58 - Mo' cheapa yet, plus
there are 40 MHz '58s these days, if you need a screaming BS1 [noparse]:)[/noparse]
regards, Jack
tadheckaman wrote:
>
> This sounds like a good idea too, I would be willing to buy a BS1
> just for the job.
>
> --- In basicstamps@y..., goflo@p... wrote:
> > I've done a similar thing with a water heater using a thermistor
> > & capacitor as described in the BS1 apps - Beeps a piezo at desired
> > temp.
> > If the controller is'nt in the freezer you'll find the set point
> > drifts quite a bit with variation in ambient temp - If this is'nt
> > acceptable another sensor can sense ambient so the pgm can compute
> > a suitable offset, or you could do something sneaky like measure
> > the cycle time of the AC line and compare the measurement with the
> > actual time.
> >
> > regards, Jack
> >
> > p.s. - Mouser, Digikey, Jameco, & a BS1 is plenty.
main thing is they have a very thin cable that does not allow the door
gasket on the freezer to leak.
Original Message
> After my large freezer died last night, I want to make a temp sensor
> that will beep or flash a light when the temperature rises above 20
> or 30 degrees. I need to know what sensors will work, where to get
> them, and some help coding (its been awhile since I played with my
> basic stamp...) I have a basic stamp 2, but I think thats kind of
> over kill just for a temp sensor, so I might get a basic stamp 1 to
> do this.
and very accurate. Once you have it programmed as a standalone
thermostat using your BASIC Stamp II, you can attach three wires to
the outside, and coat the whole thing heavily in plastic dip or wax
to protect it from the humidity. Bring three wires out of the
freezer, +power, common and output.
|--> freezer
| ;
;
+2.7-5.5v
8| |
output
7|Thi |
common
4| |
| .1uf | 1620 |
p8-p4 `
'
The output terminal cannot drive any kind of heavy load by itself.
It might need an extra transistor to drive your alarm.
-- Tracy
>Thanks I found it on the website.. But I see 2 others that look like
>they would work better, since they have wires on them, not a single
>chip. The freezer would have alot of water and condensation, so I
>would think a chip would rust and fail after a few weeks. Would those
>other ones be just as easy to hook up? Or I could put my whole
>project inside a waterproof box and freeze the whole thing, but I
>dont know if the basicstamp would work at -20 degrees.
>
>
>
>
>
>
>--- In basicstamps@y..., jonwms@a... wrote:
>> You could connect a DS1620 directly to the BASIC Stamp and with
>some really
>> easy code, have your alarm system up and going in an hour or so.
>You can
>> purchase the DS1620 from Parallax.
>>
>> -- Jon Williams
>> -- Parallax
> >
>> In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
>> tad@h... writes:
>>
>>
>> > After my large freezer died last night, I want to make a temp
>sensor
> > > that will beep or flash a light when the temperature rises above
>20
>> > or 30 degrees. I need to know what sensors will work, where to
>get
>> > them, and some help coding (its been awhile since I played with
>my
>> > basic stamp...) I have a basic stamp 2, but I think thats kind of
>> > over kill just for a temp sensor, so I might get a basic stamp 1
>to
> > > do this.
stand-alone mode as well.
Original Message
> > After my large freezer died last night, I want to make a temp sensor
> > that will beep or flash a light when the temperature rises above 20
> > or 30 degrees. I need to know what sensors will work, where to get
> > them, and some help coding (its been awhile since I played with my
> > basic stamp...) I have a basic stamp 2, but I think thats kind of
> > over kill just for a temp sensor, so I might get a basic stamp 1 to
> > do this.
> An Lm34DZ hooked up to an ADC will will do the job nicely. I use the
> TLC2543, an 11-channel 12-bit ADC. Overkill probably, but it seems to be
> chaper than a 4-channel ADC. If I can help with the code let me know.
Unless you're itchin' to make this a stamp project, try http://alarms.4mg.com/
or to roll your own or get some circuit ideas, try
http://alfaie.virtualave.net/electronics/circuits/protections/p3.html
http://www.epemag.com/0502p1.htm
Mike
At 04:19 PM 10/11/2002 +0000, you wrote:
>Thanks I found it on the website.. But I see 2 others that look like
>they would work better, since they have wires on them, not a single
>chip. The freezer would have alot of water and condensation, so I
>would think a chip would rust and fail after a few weeks. Would those
>other ones be just as easy to hook up? Or I could put my whole
>project inside a waterproof box and freeze the whole thing, but I
>dont know if the basicstamp would work at -20 degrees.
>
>
>
>
>
>
>--- In basicstamps@y..., jonwms@a... wrote:
> > You could connect a DS1620 directly to the BASIC Stamp and with
>some really
> > easy code, have your alarm system up and going in an hour or so.
>You can
> > purchase the DS1620 from Parallax.
> >
> > -- Jon Williams
> > -- Parallax
> >
> > In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
> > tad@h... writes:
> >
> >
> > > After my large freezer died last night, I want to make a temp
>sensor
> > > that will beep or flash a light when the temperature rises above
>20
> > > or 30 degrees. I need to know what sensors will work, where to
>get
> > > them, and some help coding (its been awhile since I played with
>my
> > > basic stamp...) I have a basic stamp 2, but I think thats kind of
> > > over kill just for a temp sensor, so I might get a basic stamp 1
>to
> > > do this.
> > >
> > >
> >
> >
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>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/
_________________________________
Mike Walsh
walsh@i...
[noparse][[/noparse]Non-text portions of this message have been removed]
programming, alarm and power connections and pooky the rest with hot glue.
Original Message
> Thanks I found it on the website.. But I see 2 others that look like
> they would work better, since they have wires on them, not a single
> chip. The freezer would have alot of water and condensation, so I
> would think a chip would rust and fail after a few weeks. Would those
> other ones be just as easy to hook up? Or I could put my whole
> project inside a waterproof box and freeze the whole thing, but I
> dont know if the basicstamp would work at -20 degrees.
>
> gee, never heard of overclocking a basic stamp before... would it
> need a heat sink? [noparse];)[/noparse]
Not if it's in the freezer [noparse]:)[/noparse]
jack
overclocking as well.
Original Message
> gee, never heard of overclocking a basic stamp before... would it
> need a heat sink? [noparse];)[/noparse] but I am not quite to the point of making my own
> basic stamp... even though I am thinking of making my own robot with
> a laptop as its controller...
> > Or buy the interpreter chip from Parallax & roll your own.
> > Cheap & lets you diddle the clock to suit the app.
> >
> > Or, if you've got one of the old Parallax 16CXX pgmrs, stuff
> > the interpreter & pgm into a 16C58 - Mo' cheapa yet, plus
> > there are 40 MHz '58s these days, if you need a screaming BS1 [noparse]:)[/noparse]
--- In basicstamps@y..., Mike Walsh <walsh@c...> wrote:
> Tad,
>
> Unless you're itchin' to make this a stamp project, try
http://alarms.4mg.com/
>
> or to roll your own or get some circuit ideas, try
>
http://alfaie.virtualave.net/electronics/circuits/protections/p3.html
> http://www.epemag.com/0502p1.htm
>
> Mike
>
>
>
> At 04:19 PM 10/11/2002 +0000, you wrote:
> >Thanks I found it on the website.. But I see 2 others that look
like
> >they would work better, since they have wires on them, not a single
> >chip. The freezer would have alot of water and condensation, so I
> >would think a chip would rust and fail after a few weeks. Would
those
> >other ones be just as easy to hook up? Or I could put my whole
> >project inside a waterproof box and freeze the whole thing, but I
> >dont know if the basicstamp would work at -20 degrees.
> >
> >
> >
> >
> >
> >
> >--- In basicstamps@y..., jonwms@a... wrote:
> > > You could connect a DS1620 directly to the BASIC Stamp and with
> >some really
> > > easy code, have your alarm system up and going in an hour or so.
> >You can
> > > purchase the DS1620 from Parallax.
> > >
> > > -- Jon Williams
> > > -- Parallax
> > >
> > > In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
> > > tad@h... writes:
> > >
> > >
> > > > After my large freezer died last night, I want to make a temp
> >sensor
> > > > that will beep or flash a light when the temperature rises
above
> >20
> > > > or 30 degrees. I need to know what sensors will work, where to
> >get
> > > > them, and some help coding (its been awhile since I played
with
> >my
> > > > basic stamp...) I have a basic stamp 2, but I think thats
kind of
> > > > over kill just for a temp sensor, so I might get a basic
stamp 1
> >to
> > > > do this.
> > > >
> > > >
> > >
> > >
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> >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/
>
> _________________________________
> Mike Walsh
> walsh@i...
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
the tempco of the Stamp is enough to do what you want.
I like dirts' solution, though - Too easy.
have fun, Jack
doing it...
--- In basicstamps@y..., Tracy Allen <tracy@e...> wrote:
> The nice thing about the DS1620 is that it is a single chip
solution
> and very accurate. Once you have it programmed as a standalone
> thermostat using your BASIC Stamp II, you can attach three wires to
> the outside, and coat the whole thing heavily in plastic dip or wax
> to protect it from the humidity. Bring three wires out of the
> freezer, +power, common and output.
>
> |--> freezer
> | ;
;
> +2.7-5.5v
8| |
> output
7|Thi |
> common
4| |
> | .1uf | 1620 |
> p8-p4 `
'
>
> The output terminal cannot drive any kind of heavy load by itself.
> It might need an extra transistor to drive your alarm.
>
> -- Tracy
>
>
>
> >Thanks I found it on the website.. But I see 2 others that look
like
> >they would work better, since they have wires on them, not a single
> >chip. The freezer would have alot of water and condensation, so I
> >would think a chip would rust and fail after a few weeks. Would
those
> >other ones be just as easy to hook up? Or I could put my whole
> >project inside a waterproof box and freeze the whole thing, but I
> >dont know if the basicstamp would work at -20 degrees.
> >
> >
> >
> >
> >
> >
> >--- In basicstamps@y..., jonwms@a... wrote:
> >> You could connect a DS1620 directly to the BASIC Stamp and with
> >some really
> >> easy code, have your alarm system up and going in an hour or so.
> >You can
> >> purchase the DS1620 from Parallax.
> >>
> >> -- Jon Williams
> >> -- Parallax
> > >
> >> In a message dated 10/11/02 10:28:40 AM Central Daylight Time,
> >> tad@h... writes:
> >>
> >>
> >> > After my large freezer died last night, I want to make a temp
> >sensor
> > > > that will beep or flash a light when the temperature rises
above
> >20
> >> > or 30 degrees. I need to know what sensors will work, where to
> >get
> >> > them, and some help coding (its been awhile since I played with
> >my
> >> > basic stamp...) I have a basic stamp 2, but I think thats kind
of
> >> > over kill just for a temp sensor, so I might get a basic stamp
1
> >to
> > > > do this.
tad@h... writes:
> Would this need any special resisters and capasitors, or is there a
> scematic or this somewhere that I could look it up.
>
>
Tad, if you use the LM34, always put a 1.2K resistor in series with the
sensing lead and a .1uf bypass to ground on the pin the LM connects to.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
--- In basicstamps@y..., Newzed@a... wrote:
> In a message dated 10/11/2002 13:11:39 Eastern Daylight Time,
> tad@h... writes:
>
>
> > Would this need any special resisters and capasitors, or is there
a
> > scematic or this somewhere that I could look it up.
> >
> >
>
> Tad, if you use the LM34, always put a 1.2K resistor in series with
the
> sensing lead and a .1uf bypass to ground on the pin the LM connects
to.
> Sid Weaver
> W4EKQ
> Port Richey, FL
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
The same
[noparse][[/noparse]Non-text portions of this message have been removed]
smartdim@a... writes:
> Right on,,,,,the stamp is over kill. More power to "us" electronics guys.
>
Not if you want a "smart" device that is easy to reprogram....
[noparse][[/noparse]Non-text portions of this message have been removed]
custom applications using the stamp.
The stamp would perform the task easily.
The freezer alarm does not need reprogramming however. It is a one time set
up. All am saying is the stamp is overkill. The same end result can be
accomplished with considerably less $$$$$
[noparse][[/noparse]Non-text portions of this message have been removed]