Design of microcontroller based temperature controller

摘要

The “MICROCONTROLLER BASED TEMPERATURE CONTROLLER “controls the temperature of any device according to its requirement for any industrial application. At the heart of the circuit is the ATMEGA32 microcontroller which controls all its functions. A temperature sensor LM35 is used for sensing the temperature of the environment and the system displays the temperature on an LCD in the range of –55°C to +150°C.This temperature is compared with the value stored by the user and if the temperature goes beyond the preset temperature then heater will switch off and if temperature goes below to preset value then heater will switch on. AC bulb is interfaced with the microcontroller which is done with the help of a relay and an npn transistor.