OpenTherm Click

HLW8032 Click - energy metering module

• HLW8032 Click - energy metering module
  • Overview
    • Features
  • Schematic diagram
    • Visual simulation of a transformerless power supply.
  • Module visualisation
  • Assembly
  • Production files
  • Usage Guide
  • Reporting bugs
  • License
  • Support

---

Overview

The HLW8032 Click board is a compact energy metering module designed for integration with MikroElektronika's mikroBUS™ ecosystem. It utilizes the HLW8032 integrated circuit, a high-precision single-phase energy measurement chip capable of monitoring active power, voltage, current, and power factor. This board is suitable for applications in smart energy monitoring, IoT-based power management systems, and industrial automation where accurate real-time energy consumption data is required.

Features

• Energy Metering IC: HLW8032 for precise measurement of voltage (VP), current (IP/IN), and power.
• Input Connections: 4-pin screw terminal for line (L), neutral (N), and load connections.
• Shunt Resistor: 2 mΩ for current sensing, rated for high power dissipation.
• mikroBUS™ Compatibility: Standard mikroBUS™ PCB form factor.
• Ground Separation: High-voltage ground (HVGND) isolated from low-voltage ground (GND) for safety.

The board supports UART communication at 4800 baud for serial data output, providing registers for power, voltage, current, and energy accumulation.

---

Schematic diagram

Visual simulation of a transformerless power supply.

Module visualisation

(click on the image to see the 3D model)

Assembly

Interactive BOM and placement

Production files

Production files can be found here.

---

Usage Guide

• Connection:
  • Connect AC line to J1 (L/N) and load to L1/N1.
  • Plug into mikroBUS™ socket on a host board (e.g., MCU development kit).
  • Power via +5V/+3.3V pins.
• Communication:
  • UART (TX/RX at 4800 baud, 8N1): Read 24-byte data frames for measurements.
  • PF Pin: Pulse output proportional to active electric energy.
• Software:
  • Use MikroE libraries or custom code to parse HLW8032 registers.
  • Example: Voltage = (Register Value) * Calibration Factor.
• Calibration: Adjust via software for shunt and divider ratios.
• Safety: ** Handle high-voltage sections with care; ensure proper isolation **.

---

Reporting bugs

Create an issue on GitHub

---

License

Copyright © 2025 Michal Protasowicki

This project is released under CERN Open Hardware Licence Version 2 - Permissive.

---

Support

If You find my projects interesting and You wanted to support my work, You can give me a cup of coffee or a keg of beer :)