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9 Useful LDR Circuits Explained

Last Updated on June 7, 2022 by Swagatam 32 Comments

In this post we explore 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 […]

Filed Under: Datasheets, Mini Projects, Security and Alarm, Sensors and Detectors

How to Wire a MQ-135 Gas Sensor Module Correctly

Last Updated on February 10, 2023 by Swagatam Leave a Comment

MQ-135 is a gas sensor designed to sense or detect gaseous substance and generate a corresponding positive output voltage. In this post we will learn how to connect or wire […]



Filed Under: Electronics Tutorial, How to Articles, Sensors and Detectors

5 Simple Motion Detector Circuits using PIR

Last Updated on July 15, 2022 by Swagatam 109 Comments

A PIR motion sensor alarm is a device which detects the infrared radiation from a moving human body and triggers an an audible alarm. The post discuses 5 simple motion […]

Filed Under: Infrared (IR), PIR (Passive Infrared), Sensors and Detectors

Cell Phone Ring to Flashing Lamp Indicator for People with Hearing Loss

Last Updated on March 20, 2019 by Swagatam 9 Comments

The post explains a simple sound to flashing lamp circuit which can be used for facilitating people with hearing loss, so that they are able to visualize a distant cell […]

Filed Under: Sensors and Detectors

4 Simple Proximity Sensor Circuits – Using IC LM358, IC LM567, IC 555

Last Updated on June 25, 2022 by Swagatam 85 Comments

An IR proximity sensor is a device which detects the presence of an object or a human when it is within a predetermined range from the sensor, through reflected infrared […]

Filed Under: Infrared (IR), Mini Projects, Sensors and Detectors, Simple Circuits

Color Detector Circuit with Arduino Code

Last Updated on September 13, 2020 by Swagatam

In this post we are going to construct a circuit which can detect color and trigger respective assigned relays. This project is accomplished using TCS3200 color sensor and Arduino board. […]

Filed Under: Arduino Engineering Projects, Sensors and Detectors

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