Hardware Diagram
From the Diagram above
we can see live(red), neutral(black) , and earth(green) is connected the
single phase energy meter. The analog energy meter is to show the actual
reading of the energy usage. The output of energy meter will go to the
distribution board where in this distribution board have a protective device
such as Main Switch, Residual Current Circuit Breaker, and Miniature Circuit
Breaker (MCB). The protective device is to protected the circuit from having
short circuit, overload current, earth fault and etc that can damage the
circuit. There have three output will go out from distribution board. For the
first output will go to the Step down transformer where in this situation. The transformers
will step down the voltage from 240V AC to 12V AC. The step down transformer is
need because the circuit cannot handle 240VAC voltage for the power supply
circuit. When step down voltage is 12V AC it still cannot be a power supply for
the circuit because it is still in AC voltage while the power supply circuit
need is DC voltage. So there have rectifier, to convert AC to DC voltage.
Second output is going to the load where this port is for the load such as
lamp, and other electrical component. And the third output will go to the
circuit where in this circuit it will read and give the reading and display to
the LCD. The LCD will display, energy usage (kWh) and the electric bill (RM).
