Measuring room or object temperatures with the DS18B20. It is a digital component wich does all the work for you. You only need to COMMAND it do the measurement. A short moment later you can request 2 bytes containing the temperature.

Of course there is a protocal wich says how to communicate. See 1-Wire and the DS18B20 datasheet.

How 1-Wire works (by Maxim): http://www.maxim-ic.com/products/1-wire/flash/overview/index.cfm

Maxim 1-Wire, how to communicate

Used parts:

• PIC16F689
  1. FLASH: 4096 Words
  2. RAM: 256 Bytes
  3. IO Pins: 18
  4. Clock internal: 8MHz internal, 4MHz default config
  5. Clock external:up to 20MHz external
• LCD 2×16, HD44780 Compatible
• DS18B20

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