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ELECA Block Diagram
Diagram



  
    
  
  
    
  











































































"230V AC Mains Input"
"Mains Fuse T2A node_250V"
"MOV Surge Clamp Across L-N"
"EMI Filter Common Mode Choke X2 and Y2 Caps"
"Hi-Link HLK-PM03 Isolated AC-DC node_5V Output"
"5V Rail"
"5V Bulk and HF Caps node_100uF plus node_100nF"
"AMS1117-3.3 LDO Clean 3.3V Rail"
"ADE7816 AVDD Analog 3.3V"
"ADE7816 DVDD Digital 3.3V"
"ESP32-C3 3.3V Power"
"CT Sensor 1 Room 1"
"CT Protection Stage TVS plus HF Cap"
"CT Sensor 2 Room 2"
"CT Sensor 3 Room 3"
"CT Sensor 4 Room 4"
"CT Sensor 5 Room 5"
"CT Sensor 6 Room 6"
"Precision Burden Resistors Convert CT Current to mV"
"ADE7816 Current Inputs IAP-IAN through IFP-IFN"
"Voltage Sense Divider node_470k and node_1k"
"ADE7816 Voltage Input VAP-VAN"
"ADE7816 Energy Metering IC 6 Current Channels 1 Voltage Channel 24-bit ADC and DSP"
"SPI Protection 100 ohm Series Resistors ESD TVS Arrays"
"ESP32-C3 MCU Data Processing Wi-Fi and BLE"
"IRQ and RESET Lines"
"Wi-Fi Link"
"Cloud MQTT or REST API Energy Dashboard"
"USB-C Debug USB Serial JTAG"
"UART Debug Header"
"Optional I2C Expansion"
"Status LED"
"AGND Analog Ground Under ADE7816 and CT Inputs"
"Single Star Ground Point Under ADE7816"
"DGND Digital Ground ESP32 and Interfaces"
"Low Voltage Ground Return"
Notes
  • The high-voltage primary side contains the AC terminal, fuse, MOV, EMI filter, safety capacitors, and Hi-Link module.
  • The isolated low-voltage side generates 5V first, then a clean 3.3V rail for the ESP32-C3 and ADE7816.
  • Six CT channels pass through TVS protection and precision burden resistors before entering the ADE7816 current inputs.
  • The ADE7816 measures voltage and current, computes energy parameters, and sends data to the ESP32-C3 over SPI.
  • The ESP32-C3 processes the readings and transmits them to the cloud over Wi-Fi.
  • AGND and DGND should remain separate and connect at one star point near the ADE7816.

    Notes

Documents

    ELECA Block Diagram

    ELECA Schematic Notes

Assets

Assets are files uploaded to this project which can be used in various ways.

ELECA Current Monitor thumbnail
ELECA multi-room current monitoring schematic with ESP32-C3, HLK-PM03, ADE7816, six CT inputs, mains protection, and HV/LV isolation.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$9.52–$10.76

Digi-Key

$25.69–$31.48

LCSC

$17.24–$19.81

Mouser

$32.65–$36.28

TME

$6.12–$8.47

Verical

$10.03–$12.70

Controls