HERMIT TEMPERATURE SENSOR DS18B20

HERMIT TEMPERATURE SENSOR DS18B20

This is the sensor we use on the HERMIT controller, so its the only sensor for a replacement.

A waterproof digital temperature probe containing a DS18B20 sensor. The sensor is housed in a metal probe, at the end of a 3m cable. The DS18B20 Digital Thermometer provides 9 to 12–bit centigrade 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. In addition, the DS18B20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.

This module should be connected as follows:

The green OR black wire is connected to ground (0V).

The red wire is connected to 3.0 to 5.5V power

The yellow OR white wire is connected to the 1-Wire Network.

If the probe is to use parasitic power, power is not required, and the red wire should be connected to ground as well.

Specifications

DS18B20 housed in a waterproof, metal probe

3m long cable

3.0V to 5.5V Operating Voltage

Measures temperatures from –55°C to +125°C (–67°F to +257°F)

0.5 C accuracy from –10°C to +85°C

thermometer resolution is user selectable from 9 to 12 bits

Converts temperature to 12-bit digital word in 750ms (max.)

Requires no external components