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Oil Tank Level Monitor

I 3D printed a holder for a Particle Proton and ultrasound sensor so it can be installed in a standard 275 gallon oil tank ( https://www.prusaprinters.org/prints/46664-oil-tank-level-monitor ). I put together a youtube video showing the project ( https://youtu.be/A4UfaZbKgg0 ). Blynk made the iPhone app simple!