Automatic Room Temperature Control System

The microcontroller 8051 based automatic fan system is applied to upgrade the.

Automatic room temperature control system.

Problem statement todays world is affected by a phenomenon of global warming due to which the temperature is rising which makes the human lives uneasy. System iterates forever unless it gets terminated by the user due to the behavior of the loop function. Human errors are avoided. The automatic room heater control system comprises of three 3 main subsystems.

The user enters the reference temperature by keypad and then the microcontroller turn on and off the heater or cooler when the temperature is too hot or too cold. Automatic room temperature control 1. Advantages of automatic room temperature control. It is now a health and safety issue.

The diagram for a generalized automatic temperature control system is shown in figure 1 2. The project maintains the temperature of a room in 20 25 degree celsius. It uses lm35 temperature sensor to measure temperature. Download high res image 136kb download.

Use of automatic temperature controller. Other temperature control devices the final control devices are contactors blowers electric motor or pneumatically operated dampers and valves motor operated variacs time proportioning or phase fired scr s and saturable core reactors. Download full size image fig. The temperature sensor lm35 is very accurate whose output is directly proportional to its surrounding temperature.

At room temperature the output of the sensor would be a stable value. Automatic control system is economical. For every 1 c of rise fall in temperature the output voltage of the sensor varies by 10mv. The following are the advantages of automatic control system.

Pic 18f45k22 is the brain of this automatic temperature controller system. The circuit present the design construction development and control of automatic switching electric fan and also automatic control of temperature of heater. Power supply unit the sensor unit and the control switching unit as shown in the system block diagram in fig. The design considered the flexibility of using a microcontroller pic16f876a along with other peripheral devices such as lm35 temperature sensor lcd display unit to form all encompassing.

2 2 an automatic room temperature control with security system 23 2 3 an avr lm92 temperature sensor system 25 2 4 temperature control system using lm35 26. The idea is based on the problem occurs in human s life now a days by improving the existing technology. Dedicated control over room temperature is not only a key issue in providing work conditions that ensure employee satisfaction and hence increased work output. Precession accuracy and high efficiency are obtainable.