This project is an High precision digital thermometer which indicates the temperature on the seven segment display. It has an resolution of 0.06deg.The 1 wire temperature sensor IC from Maxim semiconductors is used as the sensor. 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. It has an operating temperature range of -55°C to +125°C. In this project the negative temperatures are not taken so that it will display the temperature from 0 deg to 99.9 deg.