Need advice on what to get for temperatur application

Emmerich

I saw a setup on the internet that I wish to duplicate, but I want to make sure I have the best solution.· The setup has 4 temp sensors on a car.· The setup used a BS-2P along with a 4 line LCD display to show the temps of each sensor.· The sensors were
DS18B20's.·

My question is: are these the best sensors and controller to do the job? The temp sensors will be connected to the cooling system so they probably need to go to around 250F or maybe slightly higher.·

I have seen on the Parallax web site a thermocouple DS2760.· Does anybody know how this differs from the DS18B20?

I am totally new at this, but I can wire things up and the programming would be a snap, although if someone has a similiar example, I would love to hear about it.

Any ideas/advice?

thanks
Fred

Tracy Allen

The setup you saw sounds like a good bet. The DS18B20 is rated to measure temperatures from -55 to +125 degC (-67 to +257 degF). The BS2p has commands for the onewire protocol used by those sensors. The wiring is relatively easy, as you can string the sensor out along one signal wire, along with a ground and power.

Thermocouples can measure much higher temperatures, over 1000 degC. The DS2760 takes care of the interface to the one wire bus, and in fact you could mix a thermocouple or two with the DS18B20. Thermocouples are not as accurate, and the signal is harder to deal in terms of noise sensitivity and compensation, though, and it takes a lot more programming code on the BASIC Stamp. But of course the Parallax programming notes describe the code required.

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Tracy Allen
www.emesystems.com