My automatic soap dispenser has been through several versions. There was the regular automatic dispenser, the rainbow soap version, and now the foaming soap dispenser.
Unfortunately, keeping a bottle of diluted soap for the foaming dispenser was not a good idea. The watery mix, even with soap, ended up growing moldy. So I decided to keep the full concentration of soap in the bottle, and dilute it on demand instead. To do this, I used the pump from the rainbow version, with one channel pumping soap and the other five channels pumping water.
It uses the same technique as my tea robot, with electrodes to control the mixing pump. The mixing pump only runs when the dispensing pump runs, so there's no chance of overflowing.
Here is the block diagram:
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