Easy to use method of creating live graphs for the VEX V5 system.
This program reads data from the serial output from the V5 Brain allowing you to easily graph as many sets of data as you'd like in real-time.
Download the graph.py and requirements.txt files and run pip install -r requirements.txt. Then run python graph.py when you are ready to start graphing data. You can run this before or while the program on the V5 brain is running.
To graph the data, print out graph_data from your V5 program right before printing out the data you need.
printf("graph_data\n");Select which data to use by printing out a comma-separated list of the data labels followed by the data values, separated by |.
The first value will be the x-axis that all following data points will use, which is often time.
printf("time (ms),data1,data2|%d,%f,%f\n", time, data1, data2);Here's an example that will graph the velocity of both flywheel motors as a function of time
printf("time (ms),f1 velocity (rpm),f2 velocity (rpm)|%d,%.2f,%.2f\n", pros::millis(), fly1.get_velocity(), fly2.get_velocity);You can print out as much other data as you'd like and the program will still function, as long as you follow the format and print the data after graph_data
| Key | Command |
|---|---|
| R | Reset graph data |
| S | Toggle scrolling |
If you are having issues recognizing the V5 device, you can replace port = find_port() with port = "COM1" in main replacing COM1 with the usb port your V5 brain is plugged into.
Currently, the program only supports having a single set of data for the x-axis shared by all the data sets.
There is currently no built-in way to export the data which is something I'd like to add. For now, you can right click the graph and use the context menu to export an image.
I hope to develop a full GUI in the future to make the program much more user-friendly.
When I find time, I hope to make a full GUI to make the program much easier to use. This will include things such as resetting the graph, save graph or data, data visibility, different graph modes, and potentially more. I also hope to make the serial data format more intuitive and with greater customization. Please let me know if there are any features you would like added!