pqopen-device is a cost-effective, open-source measurement device for monitoring voltage and current within electrical distribution panels. It includes power quality (PQ) functionalities compliant with IEC 61000-4-30 and is designed for tech enthusiasts and educational institutions. It bases on the daqopen-lib for data acquisition and pqopen-lib for the power quality processing part.
Warning
The actual hardware design is not tested so far. Please wait until an official release.
- Voltage Measurement: Measure and analyze 3-phase mains voltage up to 330 VAC
- Current Measurement: Use clamps like SCT13-0000 for current measurement
- Power Quality: Analysis of RMS, Harmonics, Interharmonics, Flicker and more according to IEC 61000-4-30
- Data Aggregation: Use different storage intervals for logging selected parameters to CSV or MQTT
- Cost-Effective: Built using open-source hardware like the Arduino Due and Raspberry Pi.
- Tech Enthusiasts: People interested in measurement technology and electrical energy supply.
- Educational Institutions: For training and research purposes.
The device comprises:
- A custom mainboard with connectors, power supplies, and signal conditioning for voltage and current.
- Arduino Due for data acquisition (running with 55 kS/s per channel)
- Raspberry Pi 3A+ as the edge device.
- A standard DIN-rail enclosure (9 module width).
The main pcb is dual layer with components on both sides. It uses typically SMT components with down to size of 0805 to be soldered by hand.
The software is split into several components:
Runs on the Arduino Due for ADC data acquisition (see https://github.com/DaqOpen/daqopen-lib)
Written in C++ for Arduino IDE
There are three main software components running on the Raspberry Pi edge device to fulfill the measurement needs:
This is the data entry point for the further processing. It receives data form the Arduino Due, adds timestamps as well as channel properties and provides the data via a ZMQ PUB/SUB interface.
This service is time critical due to limited buffer on the Arduino Due and is therefore started with higher priority and realtime scheduler option.
The pqopen app is the main processing application. It connects to the daqopen-zmq-server and receives the data, calculates power values and outputs it on the configured interfaces.
When data loss is no option, the persistmq-bridge helps to cache data in case of connection loss and resending capability.
- Core Library: Runs on ARM64, AMD64, Linux, and Windows (Mac compatibility untested).
- Main Application: Designed specifically for the Raspberry Pi.
An initial setup guide will be provided to assist with assembling the hardware and installing the software soon.
Documentation for the overarching project is available at docs.daqopen.com. This documentation will be expanded to include specifics for pqopen-device.
Contributions are welcome, provided they align with the project's vision. Feel free to open issues, submit pull requests, or engage in discussions.
This project is licensed under the MIT License.