3. Twilight sensor


In this practice we are going to make a light sensor with an LDR resistor and an NPN transistor.

The resistor is the sensor that receives the light and converts it into current. The higher the light level, the more current will flow through the LDR resistor.

The transistor receives that current and amplifies it to illuminate an LED with a higher current.

The sheet to carry out the activity has the unfinished diagram on one side, so that it can be completed in pencil. On the other side is the complete scheme already finished.