New 3volution unit has clever circuitry

Beyond the marketing hype, this unit actually has a very clever feature implemented with discrete components, that allows it to detect when the refill has been changed - even when it's not plugged in.

That allows it to work out how much aroma liquid is still in the bottles during use and indicate when they it might be needing a refill by flashing the indicator lights.

Spoiler alert - the unit doesn't used chipped cartridges. It uses a switch and a single bit non-volatile memory circuit that is even active when unplugged. Like a single bit of static RAM that can be set to zero even when the unit is unpowered.

I found the circuit quite impressive. I'd more or less guessed what they might be doing, which made reverse engineering it easier.

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