Live plotting of data from a USB-enabled HOPI HP-9800 power meter

Screenshot

Acknowledgments

Most lower-level work taken from other similar projects:

• https://github.com/lornix/hopi_hp-9800
• https://gist.github.com/raplin/76da6392f34934738ff865891a7b672f#file-hopi_hp-9800_python_simple-py

Requirements

• python 3
• pyserial
• matplotlib (unless you're using this only for the readout code)

From scratch, download and install python 3 and run:

pip3 install pyserial matplotlib

Short code/file overview

• hopy.py - helpers for the next two files
• hopi_log.py - opens device, reads out, prints to stdout
• hopi_plot.py - opens device, reads out, plots in GUI

TODO

• wrap into executable, so we don't have to require you install python and some packges
• command line argument parsing
• figure out port naming and priorities on linux
• see if it makes sense to show both apparent and real power (divide by power factor)

CONSIDER

• make the interface connect to devices as you plug them in (also to be able to report, and not just fail silently), not just at startup
• reivew / fix the CRC code (right now the check on incoming data is disabled - I'm not sure whether it's just my HOPI or a general issue)
• rewrite it async style?
• web USB version?