![]() The next image, when the fotodiode, when the fototransistor receives an amount of light will let the current flow so that the voltage will tend to 0V, while if no source light is receive, the fototransistor will be in ‘open circuit’, meaning that we will be measuring basically Vcc voltage. ![]() The light is reflected so that a fototransistor receives the amount of light reflected, which is in the end transformed into a voltage. TCRT5000 module emits an infrared light using a fotodiode that it’s reflected towards the surface. Working principle, connection diagrams and programming examples with Facilino and Arduino. DYOR robot uses this module to track lines on the ground using the contrast (between black and white). Learn how to use the light module (linetracker).
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