In Montreal, bus and subway riders who use the transit system’s OPUS smart fare card and have a smartphone, can receive personalized coupons from stores and entertainment venues that are located along ...
Sometimes we need a non-contact liquid level sensor. There are several ways to build that, but the easiest is to try an optical liquid level sensor. You may already have an idea in mind since you are ...
Description of water sensor: in most houses, water is first stored in an underground tank (UGT) and from there it is pumped up to the overhead tank (OHT) located on the roof. People generally switch ...
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