10mm LDR - Photoresist

LDR is a type of resistor that changes in value depending on the light. The resistance value changes according to the amount of light it is exposed to, that is, it outputs data as a result of an external effect, so we can say that it is a passive sensor. When used with Arduino, you can use it in many projects such as a light-oriented robot, light presence or absence detection, light-oriented solar panel, etc. Its width is 10mm.

The images above show how LDRs change resistance value with light intensity and an example LDR circuit diagram. Below is an example wiring diagram of how to use it with Arduino. It is the connection diagram of the led flashing process with the data received from the ldr.