7.3--- SENSORS Part 4 (DS18S20)

i dont know anything about DS18S20 (digital) sensor. neither have i used one nor i have seen anyone using it. But i have heard it is used in applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system.

The DS18S20 Digital Thermometer provides 9–bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20 communicates over a 1-wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor/microcontroller. 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 DS18S20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same 1–wire bus; thus, it is simple to use one microprocessor to control many DS18S20s 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.


One DS18S20 costs around Rs 200.

Here is how it looks like