An enjoyable and somewhat basic electronics project is to make a simple electronic candle that uses a Light Dependent Resistor LDR to produce a flickering LED flame that switches on automatically in low light. To regulate the LED, which serves as the candles flame, the circuit makes use of the LDR variable resistance. The LED […]
LDR Circuits
Simple Flasher Circuit using LED and LDR
An LED and an LDR is used to make this simple basic flasher circuit. This circuit controls the LEDs blinking pattern by taking use of the LDRs ability to change resistance in response to light intensity. Without the need of complicated chips or transistors this device produces the effect of blinking LEDs. Basic electrical parts […]
Simple Light Operated Relay Circuit
A light operated relay circuit is like a tiny automatic light switch. It uses a special sensor like an LDR or photodiode that acts like a tiny eye. When it gets light out, the sensor sends a signal to the circuit, which then flips a switch relay on or off. This can be used for […]
Simple Automatic Night Lamp Circuit using IC 555
This circuit is like a smart switch for your night light. It uses a special light sensor LDR to see how bright it is outside. At night, when it gets dark enough the circuit turns on your lamp automatically. Then, in the morning when it gets light again the circuit turns the lamp back off. […]
Simple Backyard Lamp Circuit using IC CD4060
This backyard lamp circuit is like a smart switch for your outdoor lights. It uses a special light sensor LDR to tell the difference between daytime and nighttime. At night, the circuit turns on your backyard lamp automatically. Then, in the morning when it gets light again, the circuit turns the lamp back off. It […]
Simple Day Night Activated Switch Circuit using a Triac and LDR
This article shows you how to build a circuit that automatically turns things on and off depending on how light it is outside. You only need a few parts: a special switch called a triac, a light sensor LDR and a resistor and capacitor. This circuit can be used to turn on lamps at night […]