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This is an automatic soldering sponge water dispenser. I got tired of the soldering sponge drying out, so I built an automatic water dispenser to “water” it. The dispenser uses a sensor to measure the resistance of the sponge. If the sponge dries out too much, the resistance goes up, the microcontroller detects it and turns on the pump.
For more information about the project, see my blog posts: Soldering Sponge Automatic Water Dispenser
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