Hello friends! Today we will use an LDR sensor in Proteus to make a light-controlled LED circuit. We will begin with the photoresistor itself, convert its changing resistance into a voltage, and then compare that voltage with a reference to decide when the LED should illuminate. The original project demonstrates both a numeric light control and an animated torch control in Proteus. We will retain those illustrations and the project download while explaining what the circuit actually measures. A simulator control value is not automatically a measured voltage, and a photoresistor does not directly produce a calibrated lux reading. If you are new to the schematic editor, our Proteus ISIS and ARES tutorial collection covers the basic workflow. Here we will concentrate on the sensor, threshold ...