Keep track of your buddy's location in the water without having to radio in and getting their direction.
A smart power strip to monitor current and smart power cutoff.
Project tutorial by bbtinkerer
With a Windows tablet, Arduino, and HC-SR04, you can create a graphical caliper to show the distance.
by Philip Ushijima
Robot that drives around autonomously in greenhouse environment and identifies diseases.
An Autonomous Delivery System using the DonkeyCar which allows you to send or receive physical items, in a number of different scenarios.
Project tutorial by Abdullah Sadiq
I'm guessing you mean power? If so, you could just take the nominal AC voltage and multiply it by the current sensed through the ACS712, that should be a good enough value. Or you could hookup an AC voltage sensor to be more accurate.
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