The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user- programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C.
Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.
This listing is for a waterproof version. The main chip is contained within a stainless steel tube measuring 6 x 51mm with a lead cable.

Specification
- Output type: Digital
- Supply voltage: 3.0 - 5.5V
- Supply current: 1 - 1.5mA
- Operating temperature range: -55°C to +125°C
- Accuracy: ± 0.5 (-10°C to +85°C), ± 2 (-55°C to +125°C)
- Resolutio bit: 12bit
- Wires: 3
     red wire - VCC
     blue/black wire - GND
     white/yellow - DATA