Oscilloscope Simulator

An example for an oscilloscope simulator device along with a GUI in PyQt.

For a web GUI, visit here and for server only visit here. PyQt GUI is a standalone application that can be run on a local machine.

Currently this repository is used for speed-tests of JSON implementation (probably in future also other serialization protocols) and an online live example.

Docker image is available, just do:
docker pull ghcr.io/vigneshvsv/oscilloscope-simulator:main
for the latest image.

Following environment variables are necessary in a docker container:

• hostname - hostname of the server
• ssl_used - optional, pythonic evaluated as a boolean (satisfies if condition for any type) if your server has SSL setup
• use_ssl - optional, supply a certificate and key file under an assets folder for creating a SSL context
• port - optional, port number of the server if a registered domain is not used in hostname, default 5000 for localhost

These variables are necessary for the forms to be correctly generated in a Thing Description otherwise the device will still work, but the forms will be wrong. These environment variables are not necessary if you are running the server outside docker.

Dependencies

PyQt6, pyqtgraph, matplotlib (optional), numpy, hololinked

pip install PyQt6 pyqtgraph numpy hololinked

To run

• Go to server.py and run the script.
• Go to graph.py and run the script to show the PyQt GUI.
• speed-test.py prints speed test for script-only access (i.e. without plotting which takes its own extra time)

Result

Access speed

just acccess all 4 channels + x axis (time axis)

number of elements per array	msgspec	python's own json
1e3	5.1ms	8.7ms
1e4	10.3ms	36ms
1e5	73.2ms	326ms

1e3 means 1000 elements per array, which means that for 4 channels and time axis there are totally 5000 elements.

Preview speed

Access all 4 channels and x axis (time axis), but plot only one channel

number of elements per array	msgspec	python's own json
1e3	63FPS	49FPS
1e4	30FPS	13FPS
1e5	4.5FPS	1.7FPS

Processor speed - 3.8 to 4GHz approx

Preview

Autoscale Y Axis dont work yet