Here, it is shown how to build an Automatic Night Light Detector circuit using a simple setup involving a BC547 transistor, an LDR (Light Dependent Resistor), a 100 kΩ resistor, an LED, and a 3.7V battery. This circuit can automatically turn on an …
Controlling LED-based signboards based on ambient light levels can significantly improve their efficiency and usability. An automatic light control system can ensure that LEDs turn on only when it's dark and turn off during bright daylight, savi…
Here it is shown how one can build a light sensor detector using LM311 and LDR(Light Dependent Resistor). The light sensor detector uses Light Dependent Resistor(LDR) which is sensitive to light. When light shines on LDR, the resistance decreases. T…
Here is illustration of how to make LDR and Arduino based alarm system. The detection system works with LM358 operational amplifier which is used as comparator here. Two LEDs, green and red, are used for visual indication of absence or presence of …
Here it is explained how a light and darkness sensor circuit can be build with LDR(Light Dependent Resistor) and LM393 comparator operational amplifier. There are two circuit implementation for light sensor and two circuit implementation for darknes…
Here an automatic light controller with Arduino is build. The automatic light controller turns on bulb only when it is required and is thus useful in saving power. The light bulb is connected to Arduino which is automatically turned on when the amb…
In this Arduino electronics tutorial, we show how Light Dependent Resistor(LDR) can be used as a light detector alarm with Arduino and a buzzer. LDR is a sensor whose resistance varies with amount of light falling onto it. So it can be used as a si…
