Simple LDR Tester Circuit Using LED Indicator

simple light detection project

The LDR Tester Using LED is a very basic project that allows one to easily test the amount of light in a setup with a Light Dependent Resistor (LDR) and an LED. The higher the intensity of light, the lower the resistance of LDR. The use of an LED in a series connection between the LDR and a given resistor makes the LED brighter in environments where the resistance is low (bright light) and dimmer when the environment is darker. The circuit is user-friendly, cheap, and most suitable for use by students, hobbyists, and fans of electronic devices who may wish to test the LDRs, measure the ambient light levels, or learn about the light-reactive circuits. The project needs the simplest of components, which include a Lan ED, a resistor, an LDR, and a DC source of power. Basic indication does not need a transistor, but this can be included in the circuit to increase the current that the components can handle or to power higher loads. They can be used to test LDR sensors or make light-sensitive indicators, and to do light experiments on a whim. The LED brightness sensitivity can be controlled by changing the values of the series resistor.