20mm LDR - Photoresistor

 

Ldr is a type of resistor whose value changes depending on the light. The resistance value changes according to the amount of light it is exposed to, that is, it gives a data output 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 robot that turns towards the light, detecting whether there is light or not, a solar panel that turns towards the light, etc. Its width is 20mm.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 The images above show how LDRs change their resistance value with light intensity and an example LDR circuit diagram. Below is an example connection diagram for how to use it with Arduino. This is the connection diagram of the LED flashing and turning off process with the data received from LDR.