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You are here: Home / Archives for Infrared (IR)

Infrared Intruder Alarm Circuit using Photodiodes

Last Updated on May 12, 2022 by Swagatam 2 Comments

The post explains a simple infrared intruder alarm circuit using an infrared transmitter and an infrared receiver module. The transmitter and the receiver photo diodes used in the two modules […]

Filed Under: Infrared (IR), Security and Alarm

How Contactless Infrared Thermometers Work – How to Make One

Last Updated on February 26, 2022 by Swagatam 4 Comments

In this post we will learn the basic working concept of thermal scanners or contactless IR thermometers, and also learn how to make a practical DIY prototype of the unit […]



Filed Under: Health Related, How to Articles, Infrared (IR), PIR (Passive Infrared), Sensors and Detectors

PIR Burglar Alarm Circuit

Last Updated on March 3, 2020 by Swagatam 20 Comments

The PIR burglar alarm explained here will detect a human intruder within the stipulated range and sound an alarm. Thus, the system could be effectively use for detecting trespassing, theft, […]

Filed Under: Infrared (IR), Security and Alarm

Fiber Optic Circuit – Transmitter and Receiver

Last Updated on January 3, 2020 by Swagatam 8 Comments

Electronic signals have been quite successfully sent for decades through standard “hard -wire” connections, or by using radio links of different kinds which had many disadvantages. On the other hand […]

Filed Under: Infrared (IR), Transmitter Circuits

Photodiode, Phototransistor – Working and Application Circuits

Last Updated on October 5, 2019 by Swagatam 16 Comments

Photodiodes and phototransistors are semiconductor devices which have their p-n semiconductor junction exposed to light through a transparent cover, so that external light can react and force an electrical conduction […]

Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial, Infrared (IR), Mini Projects, Security and Alarm, Sensors and Detectors

4 Simple Motion Detector Circuits using PIR

Last Updated on September 3, 2020 by Swagatam 97 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 4 simple motion […]

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

Remote Control Tester Circuit

Last Updated on April 7, 2021 by Swagatam 12 Comments

We all use remote control handsets for controlling various household devices such as TV, AC, Music systems, curtains etc, and sometimes we seem to have problems with these devices, or […]

Filed Under: 741 IC Circuits, Home Electrical Circuits, Infrared (IR), Mini Projects, Remote Control

PIR Sensor Datasheet, Pinout Specifications, Working

Last Updated on October 2, 2021 by Swagatam 38 Comments

PIR Sensor internal composition, layout and configuration

In this post we are going to explore the datasheet of PIR or Pyroelectric Infrared Radial Sensor HC-SR501. We will understand for what purpose PIR sensor is used? Its basic […]

Filed Under: Datasheets, Infrared (IR), PIR (Passive Infrared), Security and Alarm

PIR Solar Home Lighting Circuit

Last Updated on July 3, 2019 by Swagatam 21 Comments

simple PIR based solar lamp circuit

The post explains a simple circuit using Passive Infrared or PIR for making an automatic solar LED lamp which can be used for illuminating your home automatically at sunset, and […]

Filed Under: Infrared (IR), Mini Projects, PIR (Passive Infrared), Solar Controllers

Make this IR Remote Control Range Extender Circuit

Last Updated on July 3, 2019 by Swagatam 45 Comments

433MHz transmitter circuit with infrared TSOP1730 IC

In this post we will learn how to increase or extend the range of an ordinary infra red or IR remote control through a 433MHz RF remote control system. IR […]

Filed Under: Infrared (IR), Remote Control



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