On Sunday, at approximately 4:09 a.m., the Grand Forks Fire Department responded to a water overflow alarm at Expressway Inn and Suites on 11th Ave S. When fire crews arrived on scene, they saw smoke ...
Here is another interesting hobby circuit built around the popular and inexpensive 555 IC. It is nothing but a water sensor, which you can be configured as a rain alarm, water tank overflow alarm, ...
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