Block diagram: The block diagram of the project Power
Measurement using Arduino is as shown. The load circuit
consists of resistive loads which are bulbs each of rating
200 watts.
These loads are energized by single phase 230V AC
supply.
The current and voltage through the load are stepped
down to safer values by using a current transformer and
potential transformer respectively. As the AC signals can’t be
given to Arduino board, these signals are offsetting using voltage
and current offset data conditioning cards. These cards are
energized using regulated DC supply. The function of offset
data conditioning cards is to clamp the AC signal with respect to
a preset reference DC voltage. The output waves from the
voltage offset card are given as analog input to Arduino board at
pins A
0 and ground. Similarly the output from the current offset
card is given as analog input to Arduino board at the pins A
2
and ground. Once the analog inputs are given to Arduino and
the measurement of power is done by Arduino sketch