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Components Required: 1) Breadboard 2) 1N4007 Diode 3) 470 ohm resistor 4) 15 Kilo ohm Light Dependent Resistor (LDR) 5) LED (Any Color) 6) 9Volt Battery 7) Digital Multimeter  Procedure: Connect the 1N4007 diode and 470 Ω resistor to one terminal of 15 Kilo ohm Light Dependent Resistor (LDR) in series. Connect the other terminal of LDR to the LED in series in a breadboard.  Connect the 9V battery's positive end to the anode of 1N4007 diode and negative end to the cathode of the LED as shown in the circuit diagram below. Measure the voltage across various points by altering the Light input on the LDR using a digital multimeter and note the change in brightness of the LED accordingly. Observe the change in LED brightness in a dark room and in a bright light. Here I have used a cap to cover the surface of the LDR to observe the change in LED brightness. Also observe the change in resistance value of the LDR using a digital multimeter which is the cause for the alteration in LED...

Automatic Day-Night Lamp wit LDR Maybe it's a lot who know how to work this one series, but I wanted to share back to the beginner on this. In the existing lighting circuit automatic lights that use components LDR (Light Dependence Resistor). The workings of LDR LDR is exposed to light if the layer of the resistance was weakened likewise if there is no light at all resistance enlarged. here could make friends like that, because its components are a little easy but we will use the 220V AC voltage of course you must be very careful. Rather than actually being burnt. The author asks to be careful for the beginner course. Schematic LDR LDR components can be interconnected with a cable, so tools stay in the house but LDR is outside the home. It is recommended using qualified Relay no1 to avoid fire, because the relays are cheap to produce heat. Relay that cheap is not in use for high voltage. Travonya use the cheap, because this circuit does not require large currents. The function of P...