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All Indian Railway Permanent Way offices monitor rail tracks to record their maximum and minimum temperature of the day at hourly intervals. It is done to check the metal shrinkage during winters and expansion during hot weather. This is...
In India, we are experiencing the 2nd wave of Corona and it is much stronger and deadlier than the previous year. People are finding various ways to fight it. We all are familiar with basic protection from the virus,...
This circuit of single-cell LiFePO4 (lithium iron phosphate) battery charger is based on an LM358 operational amplifier (op-amp) and a couple of inexpensive and easy-to-get components. It can be powered from any USB port or USB standard power supply...
This project is used to detect colours and display the colour names on an LCD using the TCS3200 colour sensor module and Arduino board. The sensor outputs red, green, and blue colours’ reflected light values using colour tinted photodiodes....
Small drones are being used to deliver parcels, for videography of events such as marriages, and surveillance of enemy territory. You can make a drone at home without spending a fortune. Presented here is a low-cost quadcopter drone using...
This project can be used to control multiple electrical appliances on any floor from any floor of a multistory building that has up to six floors. It uses a controller area network (CAN) bus and Arduino Uno to control...
  Making public announcements in a quick, time-bound manner while covering large areas sometimes becomes costly. Due to the limitations related to travelling, it is hard to reach all the places within less time. To address this issue, I have...
Here is a simple stereo audio amplifier that can be made using a TDA1517 IC. A 14.4V regulated voltage is used as power supply for this amplifier. TDA1517 is a 9-pin (single-in-line package) audio amplifier IC, which is inexpensive...
This circuit uses power bank and DC-DC booster module not only for charging mobile devices but also to provide 1.2V to 37V DC power supply. The compact circuit can even be used during AC mains power failure. Circuit and working While...
To avoid the risk of contracting Covid-19, it is important not to touch surfaces including switches, doorknobs, and keys that have been frequently used by other people. This project is for a contactless switch that works with hand gestures. The...