i have this wattmeter circuit
View attachment 84822
it is directly powered by mains and neutral lines via 15V zener diodes, pin 7 is the output pin, this circuit can sense up to 2200W of power. now my question is, i want to connect the pin 7(output pin) to ADC input, and ADC output to the 8051 microcontroller, but my problem is that where to connect the ADC ground pin and microcontroller ground pin?? can i connect it directly to the neutral line?? please friends help me in this circuit.