When polarized in reverse and no light radiation reaches it, it also behaves like a diode normal since the electrons flowing through the circuit do not have enough energy to go through it, so the circuit remains open. Its internal operation is as follows: when the photodiode is polarized in direct, the light that falls on it does not have an appreciable effect and therefore both the device behaves like a common diode. Of course, the same as with diodes common, normally the anode is longer than the cathode (if they are equal length, the cathode should be marked in some way). Like standard diodes, photodiodes have an anode and a cathode, But be careful, in order for it to work as we wish, a photodiode must always be connect to the circuit in reverse polarity. It must be taken into account that, despite having a behavior in similar appearance to LDRs, a very important difference from these (in addition sensitivity to other wavelengths) is the response time to changes from darkness to illumination, and vice versa, which in photodiodes is much lower. In this way, they can be made serve as light sensors, although, while it is It is true that there are photodiodes especially sensitive to visible light, the vast majority are especially in infrared light. Photodiode, phototransistor, and IR Sensor with Arduino– A photodiode is a device that, when it is excited by light, produces in the circuit a proportional current flow (and measurable). How to make Remote control using IR sensor:.Example1: how to check the behavior of photodiode.
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