The DS18S20 digital thermometer provides 9-bit Celsius 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. 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.
This application was developed to monitor the environment of sensitive computer equipment located in a computer room for excessive high or low temperatures.
Computers housed in a room can generate a lot of heat. This heat can cause serious damage to electronic equipment and can lead to data corruption. This situation normally occurs when an air-conditioning unit fails and nobody knows about the failure.
Using a Dallas DS1820 diode, we developed a temperature monitoring module which has minimum and maximum thresholds before it alerts the designated user(s) about the temperature situation.
When a threshold is reached, the designated cellular telephone number(s) are retrieved from a database and a message is sent via sms about the current temperature in a designed location.
Now the technicians have enough time to shutdown no-critical equipment while repairs to the cooling system is being done.
Click here for a screenshot...
