AUTO SELECTION OF FAN AVAILABLE FROM MULTIPLE SUPPLY SOURCES

Model no.3A:

            The outline of the project is selection of supply from mains, generator, and inverter and solar automatically by using microcontroller concept. As it is not feasible to provide all 4 different sources of supply, one source with alternate switches are provided to get the same function. In this project we are having 4 switches which we consider as 4 different source of supply. When we press any of the switches it shows the absence of that particular source which is connected to microcontroller as input signals. Here we are using 8051 family microcontroller. The output of microcontroller is given to the ULN2003 this acts as a relay driver. This can drive up to 7 relays. The relays which are used hear are 12V relay. The output can be observed using a fan which is getting uninterrupted power supply from other means if main supply is cut off. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.

For more details about this project, please visit      http://www.efxkits.com/project-kit/microcontroller/1064.html

HARDWARE REQUIREMENTS:

Microcontroller unit, ULN2003, Relays, LCD, Fan, Push Buttons, Transformer, Diodes, Voltage Regulator, Crystal Oscillator, LEDS, Capacitors, Resistors.

SOFTWARE REQUIREMENTS:

Keil compiler, Languages: Embedded C or Assembly

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