These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...

Until now, he had no way of knowing how much oil was left in the tank ... sensor, a temperature sensor and an LED indicating the power status. On the other side of the CAT5 cable can be found an ...

Divers can verify the ratio of oxygen to nitrogen in their nitrox tanks ... sensor in hand, the project really boils down to building up an interface and enclosure for it. [Eunjae] is using an ...