DS18B20[about the performance characteristics (V vs T)graph]

[jason0309]

Base on my research, there are no V(DQ) vs T(Temperature) graph in the DS18B20 datasheet. Does anyone have the DS18B20 V vs T graph?

My project is roof sprinkler. So the DS18B20 have to sense a certain temperature, then trigger my sprinkler to on and off and show the temperature value in LCD. I heard some people say that you have to plot the V vs T graph first, only can write the program.

Or, we no need to bother the V vs T graph?

For you all more clear, I will give you an example:
Sprinkler at first is embed in my roof, when T=below 31C, sprinkler will remain off, when T= above 32C below 60C, DS18B20 will sense signal to PIC16F877A to trigger the sprinkler to on. When T is above 60, sprinkler will sprinkler more faster and the alarm will go on to indicate there is a fire hazard.

[Guest]

Hi,

V vs. T graph?? Do you mean 'voltage as a function of temperature'? Did you read the data sheet? Did you search the forum archives? The DS18B20 is a one wire digital temperature sensor that returns a digital word representing temperature, NOT an analog voltage.

Good luck on your project ;-)!

Chad