Obviously you might have seen so many temperature controller and indicator applications using different micro-controllers, micro-processors or other controlling devices. But this is the actual application of temperature controller that controls speed of DC fan as temperature varies. It is not a simple ON-OFF type controller that switches fan ON / OFF when temperature increases / decreases certain limit. But its continuous type controller that continuously varies speed of DC fan as temperature increases / decreases. That is a demo of actual industrial application.
Simple TRIAC Controlled Ceiling Fan
Conventional Ceiling fans operate with voltage divider circuit. Alternatively Ceiling fans can even be operated with Silicon Controlled Rectifiers TRIAC, and 555 timer circuits. This circuit is very cheap in its build. Circuit Diagram Tab 1 shows the TRIAC ceiling fan circuit while circuit diagram tab2 details with the power supply. Working The 230V 50Hz supply…
Temperature Controlled Fan
A simple project using microcontroller AT89S51 to control the speed of 12V fan according to the surrounding temperature. In this project we use the concept of PWM (pulse width modulation) to increase or decrease the speed of fan. We also interface 2*16 characters LCD which shows the outside temperature through the temperature sensor. Followings are…