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Often, we communicate within a known group of office or friends using short key words or phrases. This group messenger can be useful to such small groups for whom a keyword is sufficient to understand the message. The display...
You may be wondering about this article on a crystal radio in an era of digital broadcasting and digital audio. Crystal radios were quite popular and played an important role in communication from 1920s to 1940s. The number of...
What if you could make a drone that would recognise people, track someone in a crowd, and help find criminals? What if this drone could also detect traffic congestion on the road ahead, or detect people stuck in floods,...
This project is meant to control electrical appliances like fans and lights. You can configure two Yoda modules, one as receiver and the other as transmitter, to control relays that switch on fans and lights. The block diagram for...
Ever since the UK variant of Covid19 hit our country towards the end of March-21, in a span of two weeks we have more than 300 active cases in our small township. Everyday one department or other is hit...
This Android-based project can monitor on-site (field) process data sensed by two temperature sensors and display the temperature (in degree centigrade) on a smartphone. The authors’ prototype of the project is shown in Fig. 1. A smartphone-based process monitoring system...
The Internet of Things (IoT) is commonly used in homes and industries for monitoring sensor values. In this project, the Blynk IoT platform is used to get notifications through smartphone and email when the air-quality sensor detects a value...
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...