Measuring the speed of a rotating object is a common requirement. Knowing the speed of table and ceiling fans, as well as ...

It's why DIY smart home projects suddenly got cheap (and actually doable) ...

Abstract: Visible light communication (VLC) based on image sensor (IS) as the receiver is one of the supplementary technologies of radio frequency communication. By combining with image processing ...

Abstract: We developed a compact sensor module for hydroponics that measures the nutrient concentration and water level using simple oscillator circuits. Oscillation frequencies are measured and are ...