1 Arduino ANALOG Understanding a light sensor LDR
So far we have looked at digital sensors that output 1s and 0s. Most sensors however do not just have two values. For example, a digital pressure sensor might say HIGH pressure (logic 1) and LOW pressure (logic 0) but we might want a pressure sensor that says how much pressure. For this we would want a pressure sensor that varies its readings continuously as the pressure changes. These type of sensors are said to operate in the analog domain. Today we will explore a Light sensor. The light sensor is basically an element called a Light Dependent Resistor (LDR) or more commonly as a photoresistor.
Now let's grab a photo-resistor and connect it directly to a multi-meter as shown You can do this if you have access to a multimeter and a photo-resistor or virtually through TinkerCAD. Here I will use TinkerCAD.