Inside an automatic foam soap dispenser with clever pump. https://stream.echo6.co/videos/watch/78a30550-d4b3-475d-b3f6-873a85a2ebc6 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 If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. Wed, 15 Apr 2026 09:47:40 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co Inside an automatic foam soap dispenser with clever pump. https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/78a30550-d4b3-475d-b3f6-873a85a2ebc6 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.