Or you can go back to basics and build this reflective RGB sensor from an LED and a photocell ... lights on an object and measure how much light it reflects. If you know the red, green, and ...

It is not magic…it’s science! How does it work? Light from an object makes its way to a sensor (see figure 1) in a camera. On the sensor there are millions of cells called photocells. Each photocell ...

The contract expired more than three years ago. Photocell sensors are placed on the street lights. Once natural light is detected by the sensor, the lights switch off and come on again after sunset.