Energy Meter Circuit Design

0:13

If you’re doing Option 1 (no mains anywhere on the PCB), then J8 should represent an off-board “load-side mains” connector (i.e., where the switched hot and neutral leave the relay module and go to the load), purely for documentation / wiring reference.

Concretely, in the schematic:

J7 = MAINS input (from wall): MAINS_L, MAINS_N (off-board wiring only)
J8 = LOAD output (to appliance): LOAD_L, LOAD_N (off-board wiring only)

And the key rule: J8 should not connect to any low-voltage nets (5 V / 3V3 / GND / ADC signals). It just anchors the net names LOAD_L and LOAD_N so it’s unambiguous how the external relay module and load wiring are intended to be hooked up.

If you want it even clearer, rename/annotate J8 in its value/description to something like “OFFBOARD_LOAD_OUT (wiring only)”.

56 days

talalabuhijleh

I want J8 to be the load output: rename its nets to LOAD_L and LOAD_N (wiring only).

56 days

flux

0:51

Considering.

Checking if I can make the changes for you.

Net Connections to be added

Net	Connections

Net Connections to be removed

Net	Connections

56 days

Updated 2 connections

0:13

Connected J8:Pin_1 to ^LOAD_L

Connected J8:Pin_2 to ^LOAD_N

56 days

J6 7 - C9 P2

D1 K - R11 P2

D2 K - R12 P2

J6 7 - C9 P2

R13 P2 - R14 P2

R1 P2 - R2 P1

J6 7 - C9 P2

J3 1 - R1 P1

R3 P2 - R4 P1

R13 P2 - R14 P2

Resistance

10kΩ

Resistance

10kΩ

Resistance

10kΩ

Resistance

10kΩ

Resistance

10kΩ

Reviews

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Project Name

Description

Low-voltage energy meter front-end (ESP32 + ACS712 + 9VAC sense)

Properties

System Ar…itecture

Pricing & Availability

Distributor	Qty 1
Arrow	$5.96–$8.68
Digi-Key	$7.08–$10.09
LCSC	$5.58–$6.50
Mouser	$13.97
TME	$6.93
Verical	$6.69–$13.72

Controls

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