What about correlating transmitted wireless frames with a LED flashing pattern? If the glasses stream video with a variable bitrate codec over wireless, flashing vs. non-flashing should change bandwidth and therefore frame frequency. However, with searching over all channels this might be quite slow in practice.
For non-professional application it’s not the cheapest option, however on the used marked I payed 82 € for my last ethernet bus cupper plus 3 digital IO terminals. Often used Beckhoff variants of the functional identical terminal are a little bit cheaper than WAGO – might have to do with the different market segment they targeting. In a professional setting the hardware costs compensate often easily for saved working hours in debugging flimsy screw terminal connections and dubious firmware flaws. Also, the cheap options often need more than 5 times the control cabinet real estate per IO, witch alone can compensate for the higher price.
To avoid the discussion where around the critical point it is a gas or not a gas ;) Sure, for ideal gases it’s quite clear; however I’m looking for adding real gas behavior to capture high density supercritical fluids - being able to model high pressure processes. For example for the synthesis of hydrocarbons and chemical compound made from nitrogen and hydrogen.
I would say it depends on the application: For energy stuff, ideal gas + water/steam might be sufficient. Rolling a lightweight process simulation framework (e.g. on top of gaspype and pint) easily competes with the costs for an aspen license. For other applications, that requires solving multiple phases of mixtures, the tradeoff shift quite allot.
That looks like a valuable resource, thank you! I already mostly stuck to a subset supported by NumPy and JAX (because that's the array libraries I'm familiar with). I hope the other are not to far off...
