I was expecting this unit to be based on a single motor driving a separate fluid pump and aeration system. But they've got a very clever pump system that combines the two into one.
The infrared sensor seems to put out four pulses a second. I didn't reverse engineer the op-amp section because I have a feeling that it may just be a pre-filter and amplifier, with the microcontroller processing the resultant voltage level via an analogue input.
On eBay this type of unit has the description:-
350ml Automatic Foam Soap Dispenser Infrared Motion Sensor Touchless Hand Washer
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