Project Description:

The Fire Detector and Control with Cooling Fan uses a thermistor, IC 555, and relay to detect heat and trigger a cooling fan to prevent a fire from spreading. The project uses a thermistor to sense the temperature in the environment. When the temperature rises beyond a certain threshold, the thermistor's resistance changes, which triggers the IC 555 to activate a relay. The relay, in turn, activates a cooling fan to reduce the temperature and prevent the fire from spreading.

Working Method:

The thermistor is connected in a voltage divider circuit with a fixed resistor, which provides a reference voltage to the IC 555. The output of the voltage divider is connected to the trigger pin of the IC 555. When the temperature rises and the resistance of the thermistor decreases, the voltage at the trigger pin falls below a certain threshold, which triggers the IC 555 to output a high signal. This signal is then used to activate a relay circuit, which turns on a cooling fan.

To set up the project, you will need to connect the thermistor and the fixed resistor to the voltage divider circuit and the output of the voltage divider to the trigger pin of the IC 555. The output of the IC 555 can be connected to a relay circuit, which can turn on a cooling fan or other cooling devices to prevent the fire from spreading.

Overall, this project provides a simple and cost-effective way to detect fires using a thermistor and an IC 555 and control the spread of fire using a cooling fan. It can be used in small rooms or homes to provide basic fire detection and prevention.