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 without Arduino. In the … [Read more...] about How Contactless Infrared Thermometers Work – How to Make One
PIR Burglar Alarm Circuit
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, intrusion, … [Read more...] about PIR Burglar Alarm Circuit
Fiber Optic Circuit – Transmitter and Receiver
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 … [Read more...] about Fiber Optic Circuit – Transmitter and Receiver
Photodiode, Phototransistor – Working and Application Circuits
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 … [Read more...] about Photodiode, Phototransistor – Working and Application Circuits
4 Simple Motion Detector Circuits using PIR
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 detector circuits using op … [Read more...] about 4 Simple Motion Detector Circuits using PIR
Remote Control Tester Circuit
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 even a newly … [Read more...] about Remote Control Tester Circuit