How to take Pulse out from the Energy meter

1. Open the Energy meter first




2. Just Cut the Cathode terminal of the Cal LED


3. Solder 2 wires on the 2 ends of the LED.


4. Connect the Cathode of the LED to the Pin1 of the Opto-coupler (MCT2E) and the other end of the LED to the Pin2 of the Opto-coupler




5. Connect pin 4 of the opto-coupler to a Black wire and Pin5 to the brown wire.
Connect the Black wire to the ground of the circuit board for the projects Prepaid energy meter or Auto meter reading projects.
The Brown wire carry's the pulse output.


6. Connect the power supply and load as per this picture.

Where to connect Brown wire to get KWH readings in Atmega16 (microcontroller)? and how?

You have to calculate the KWH readings from the pulse.
Modern Energy meters comes with serial port, which gives out all data's through it.

do we need to connect 5v to the optocoupler??..how does it work??