Sensing Light
#light sensor
#photoresistor
#LDR
#light detection
#ambient light
#sensing circuit
#analog sensor
#light measurement
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Night Security LightCircuit
This simple circuit activates a light approximately two hours after midnight, a time when many robberies occur. The circuit is based on a CMOS IC 4060 to achieve the necessary timing. During the daytime, the light-dependent resistor (LDR) has low...
Light Pollution Meter
My circuit adds a transistor, to add feedback, and two resistors, to tailor the range of the control, with the result that a single-turn potentiometer gives a control range of about 2 to 30 microamps. I installed my circuit in...
Bridge Head
The LDRs were hand-picked. Got two packages of them from Radio Shack, looking for at least two pairs of similar parts. Then added wire-wrap pin sockets to the circuit so that the LDRs could be plugged in. Currently, the 0.33µF...
Simple Photoresistor Circuit
A simple photoresistor circuit will be constructed to demonstrate the operation of a photoresistor, which activates the circuit in the presence of light and deactivates it in darkness. This circuit connects a photoresistor to an LED. When the photoresistor is...
Light/Dark Detectors
This compact circuit is capable of distinguishing between light and darkness, making it highly beneficial for controlling the operation of signs, porch lights, or other devices in response to changing light conditions.
The circuit operates using a light-dependent resistor (LDR) as...
Light-Controlled Pond Pump
This circuit was designed to control a pump in a garden pond, enabling it to automatically activate at dawn and deactivate at dusk.
The circuit utilizes a light-dependent resistor (LDR) to detect ambient light levels, which serves as the primary sensor...
Digital Light Sensor
The Intersil ISL29001 is a digital light sensor designed to measure light intensity and easily interface with a microcontroller.
The Intersil ISL29001 is a highly integrated digital light sensor that operates using a photodiode and an analog-to-digital converter (ADC) to provide...
LDR PC Desk Lamp
Most of the PC desk lamps available in the market illuminate whenever there is input power. These do not consider whether there is an actual need for light.
The typical design of PC desk lamps operates on a straightforward principle: they...
Laser Beam Light Activated Remote Control Circuit
The following post illustrates a simple light-operated remote control circuit that can be activated by an ordinary flashlight or, more effectively, through a laser beam unit (keychain type). The Light Dependent Resistor (LDR) is connected between the base of the...