The LDR photoresistor is a special type of resistor, so it has no polarity. This means they can be connected in any direction. They are panel friendly and can also be easily used on perforated panels.
1. It can be used to perceive light;
2. The LDR photoresistor is easy to use on the panel or Perf board;
3. Easy to use microcontroller or even common digital/analog IC;
4. LDR photoresistor is small, cheap and easy to use.
The LDR photoresistor, as the name suggests, will change its resistance according to the surrounding light. That is, when the resistor is placed in a dark room, it will have a resistance of a few megohms, and when we gradually apply light to the sensor, its resistance will start to decrease from megohms to a few ohms.
This property helps to use the LDR photoresistor as a light sensor. It can detect the amount of light falling on it, so that day and night can be predicted. Therefore, if you are looking for a sensor that senses light or distinguish between day and night, then this sensor is a cheap and suitable solution for everyone.