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LDR

Blinking LED Circuit using LDR and Resistors

Last Updated on January 3, 2024 by Swagatam 10 Comments

LED LDR blinker GIF

This is perhaps the most simplest looking LED flasher that does not depend on any semiconductor. This LED blinker circuit utilizes ordinary passive components like a few resistors, a capacitor and an LDR. Meaning, this LED flasher does not depend on transistors or ICs to create the blinking effect. Circuit Description The LED-LDR combination is […]

Filed Under: Lamps and Lights Tagged With: Blinking, LDR, LED, Resistors

9 Useful LDR Circuits Explained

Last Updated on January 2, 2024 by Swagatam 43 Comments

LDR cross section view

In this post I have explained 9 LDR circuit projects that uses LDR light sensor to trigger a load ON/OFF through a relay. These circuits are mostly triggered by the absence or the presence of light on the LDR. The circuits are built using transistors, op amps and LDR along with a switching relay. Let’s […]

Filed Under: Sensors and Detectors Tagged With: Circuits, Explained, LDR, Useful

Solving LDR Controlled LED Emergency Lamp Problem

Last Updated on January 2, 2024 by Swagatam 2 Comments

Simple emergency Lamp 2

The following post discusses the troubleshooting of an automatic LDR controlled emergency lamp circuit which was requested to me via email by one of the keen followers of this blog. I have explained about the issue and its solution. Technical Specifications Dear Sir, I am following you on your website and I thank you for your valuable […]

Filed Under: Lamps and Lights Tagged With: Controlled, Emergency, Lamp, LDR, LED, Solving

How to Make LED/LDR Opto Coupler

Last Updated on July 1, 2024 by Swagatam Leave a Comment

6miiliongaincircuitwithbuzzer001

Ever needed an application where the resistance of a resistor needed to vary proportionately in response to a PWM or a varying analog voltage? Yes, this is where an LED-LDR opto-coupler becomes so useful. The following image shows the symbol for a LED LDR opto-coupler. Any other regular opto-coupler, such as an LED/transistor, LED/FET, or […]

Filed Under: Sensors and Detectors Tagged With: Coupler, LDR, LED, Opto

Simple LDR Motion Detector Alarm Circuit

Last Updated on January 29, 2024 by Swagatam 33 Comments

Here I have explained how to build a simple LDR based motion detector sensor circuit using ordinary parts such as LDRs and opamps, reasonably accurately. What are Motion Detectors Motion detector or sensor alarm is a device which detects the presence of a motion or movement within a certain fixed range and raises an alarm […]

Filed Under: Sensors and Detectors Tagged With: Alarm, Detector, LDR, Motion, Simple

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