wireless temperature sensor

[Peter Turner]

Hi friends

I am working on an application which is used to sense temperature and pressure from a boiler and can give its output wirelessly

i am using 8051 Microcontroller, LM335 for temperature sensor circuit, MPX4250 for pressure sensor circuit

and using xbee to get output i want it to be more accurate and useful so i need some worthful suggetions from you guys

 

[Christian Wilhelmsen]

 So, what accuracy do you have right now? One can not say what to do when we don´t know what you have already done.

[Engr. Mansoor Mirza]

you can use DS 1621 Chip for more accuracy!   The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface. emperature measurements require no external components     ?Key Features:   Measures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to 257°F in 0.9°F increments Temperature is read as a 9-bit value (2-byte transfer) Wide power supply range (2.7V to 5.5V) Converts temperature to digital word in less than 1 second Thermostatic settings are user definable and nonvolatile Data is read from/written via a 2-wire serial interface (open drain I/O lines) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system 8-pin DIP or SO package (150mil and 208mil)

 

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