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Temperature transmission

V

varun kumar

Jan 1, 1970
0
Hi everyone,

I'm doing a project on "measurement of temperature using a Rover"
AS a part of this we need to measure the temperature of the
surroundings and transmit this temp. value. For transmiting the
temperature I decided to use FM transmission and for temp. sensing
I
decided to use LM35.For displaying temperature value at the reciever
I
decided to atm microcontroller(89c51)


So if any one knows the details regarding this Temperature
transmission . plz send me the details. [email protected]


Components used are:
lm35 (temperature sensor)
FM transmitter and reciever
at89c51 (microcontroller)
lcd
 
J

John Popelish

Jan 1, 1970
0
varun said:
Hi everyone,

I'm doing a project on "measurement of temperature using a Rover"
AS a part of this we need to measure the temperature of the
surroundings and transmit this temp. value. For transmiting the
temperature I decided to use FM transmission and for temp. sensing
I
decided to use LM35.For displaying temperature value at the reciever
I
decided to atm microcontroller(89c51)


So if any one knows the details regarding this Temperature
transmission . plz send me the details. [email protected]


Components used are:
lm35 (temperature sensor)
FM transmitter and reciever
at89c51 (microcontroller)
lcd

I suggest you make a voltage to frequency converter, to
change the temperature signal to an audio tone. Use that to
modulate the FM transmission. At the receiving end, you
change the frequency of the tone back to voltage, or measure
the frequency, digitally, and convert to temperature with a
look up table. There are lots of ways to do voltage to
frequency, from a 555 and LM2907. But there are also
temperature sensors that output frequency, directly.
See page 6 of:
http://www.analog.com/UploadedFiles/Data_Sheets/AD537.pdf

Or you could convert the temperature signal to a variable
duty cycle digital signal (variable mark/space ratio), and
modulate the FM with one of two tones for the two variable
times per cycle. You would have to convert the received
pair of tones back to the two digital values (see LM567
http://cache.national.com/ds/LM/LM567.pdf )
so that the duty cycle can be measured by the micro.
 
S

SR

Jan 1, 1970
0
hi,
i like to tell something abt the same project, that is temperature
indicator using 89c51.ie,v r doing digital thermometer,it consist of a
sensor,LM35 which is acting as a current to voltage converter, n the
output of the sensor will b given to an ADC whose output is in digital
format.This digital format information is our temperature whcih is in
the form of voltage.Inorder 2 convert it to corresponding temp,v uses
a microcontroller,ie 89c51.And the output of the mc wil provide to the
LCD display.

And if it is needed v can provide additional facilities like
temp range indicator etc.acually i wan ur help inorder 2 modify the
same project with additional ideas ie using this same principle other
than temp measurement can v do somethin else with the same circuit.ie
extra fittings.thank u
 
J

Jan Panteltje

Jan 1, 1970
0
hi,
i like to tell something abt the same project, that is temperature
indicator using 89c51.ie,v r doing digital thermometer,it consist of a
sensor,LM35 which is acting as a current to voltage converter, n the
output of the sensor will b given to an ADC whose output is in digital
format.This digital format information is our temperature whcih is in
the form of voltage.Inorder 2 convert it to corresponding temp,v uses
a microcontroller,ie 89c51.And the output of the mc wil provide to the
LCD display.

And if it is needed v can provide additional facilities like
temp range indicator etc.acually i wan ur help inorder 2 modify the
same project with additional ideas ie using this same principle other
than temp measurement can v do somethin else with the same circuit.ie
extra fittings.thank u

Max and min temperature, logging to a file for the year, humidity with
a different sensor, air pressure with an other sensor, wind speed and
direction with yet an other sensor..., radioctivity with [], light
sensor for the shades, and count the sunny days, rain sensor, sound
pressure sensor, lightning detector, CO detector, other gasses detector,
passive IR detector, etc...
Enough?
 
L

linnix

Jan 1, 1970
0
hi,
i like to tell something abt the same project, that is temperature
indicator using 89c51.ie,v r doing digital thermometer,it consist of a
sensor,LM35 which is acting as a current to voltage converter, n the
output of the sensor will b given to an ADC whose output is in digital
format.This digital format information is our temperature whcih is in
the form of voltage.Inorder 2 convert it to corresponding temp,v uses
a microcontroller,ie 89c51.And the output of the mc wil provide to the
LCD display.
And if it is needed v can provide additional facilities like
temp range indicator etc.acually i wan ur help inorder 2 modify the
same project with additional ideas ie using this same principle other
than temp measurement can v do somethin else with the same circuit.ie
extra fittings.thank u

Max and min temperature, logging to a file for the year, humidity with
a different sensor, air pressure with an other sensor, wind speed and
direction with yet an other sensor..., radioctivity with [], light
sensor for the shades, and count the sunny days, rain sensor, sound
pressure sensor, lightning detector, CO detector, other gasses detector,
passive IR detector, etc...
Enough?

Location, location and location. We would like to log the absolute
location of an unstable hillside. With heavy rains for the past few
days here, I wish we have it in place already.
 
T

Tim Wescott

Jan 1, 1970
0
varun said:
Hi everyone,

I'm doing a project on "measurement of temperature using a Rover"
AS a part of this we need to measure the temperature of the
surroundings and transmit this temp. value. For transmiting the
temperature I decided to use FM transmission and for temp. sensing
I
decided to use LM35.For displaying temperature value at the reciever
I
decided to atm microcontroller(89c51)


So if any one knows the details regarding this Temperature
transmission . plz send me the details. [email protected]


Components used are:
lm35 (temperature sensor)
FM transmitter and reciever
at89c51 (microcontroller)
lcd
Why not measure temperature using an MG or a Citroen?

John P.'s suggestion of using analog telemetry is good if all you're
ever going to do is measure one thing. If there's any hint that you'll
want to measure other quantities consider using some low rate digital
telemetry. I'd suggest 300 baud FSK, or perhaps 1200. This should be
easy to implement, it should work just dandy with the serial output of
your microprocessor, and you'll be able to send just about anything you
can dream up.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Posting from Google? See http://cfaj.freeshell.org/google/

"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html
 
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