Microcontroller,
LCD, LED and relay driver chip need a 5V dc. So the power supply for electronic
circuit was 5V dc. Microcontroller needs 5V dc to activate the chip and provide
signal. Power supply from 9V dc battery
regulated by voltage regulator to 5V dc
as required for the circuit.
Voltage must be
regulated to 5V dc by using voltage regulator LM 7805. This voltage regulator
can withstand of input high from 35V dc regulate to produce an output of 5V. It
also requires heat sink to protect the device from damage due to overheat. When
it was operated, it produces a lot of heat.
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