A Automatic Light Sensor Buzzer Circuit using Transistors is a simple electronic project which gives alarm sound when light level changes. In this circuit, an LDR (Light Dependent Resistor) senses the surrounding light, and when the room becomes dark, the resistance of LDR increases and because of this, transistor stages switch ON one by one […]
LDR Circuits
Darkness Activated LED Circuit
This article explains about a Darkness Activated LED Circuit which is useful device that saves power, also it is energy efficient circuit because light glows only in darkness. The circuit automatically turns the light ON at night and OFF during the day, so we never need a manual switch for daily operation; also the circuit […]
Laser Light Alarm Circuit using Arduino
This article is for simple Laser Light Alarm Circuit using Arduino. A laser light shines on an LDR and when someone blocks the laser beam, the LDR changes its value and then Arduino reads this change and turns ON the buzzer to make alarm sound. A reset button stops the alarm. Also, the system uses […]
Laser Security Alarm Circuit using LDR and BC547 Transistors
This project is for Laser Security Alarm Circuit using LDR and BC547 Transistors, as it uses LDR, two BC547 transistors, one diode and a buzzer. When laser light breaks an alarm rings. Additionally, this circuit is cheap and very easy to build and is good for door security, box security and drawer protection. Circuit Working: […]
Automatic Street Light Circuit using Arduino
This project for Automatic Street Light Circuit using Arduino show street light can think smart. Light will turn ON when night come and light will turn OFF when sun come; therefore no need of a human to press a switch. Arduino and LDR do all work automatic and it also save power and make street […]
Smart Street Light Control Circuit
Light ON at night and light OFF in day all automatic! A single LDR and a BC547 transistor perform all these functions. This Smart Street Light Control Circuit is a easy and simple way to save energy and also there is no manual effort and no energy waste. Circuit Working: Parts List: Components Values Quantity […]