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Information about the total number of persons present inside a building such as a hospital, shopping mall, or factory helps provide crucial information to the security/safety personnel during emergency situations. This article presents the implementation of an Arduino based...
Wireless sensor node is a sensor node with a wireless transmitter. It has one or more sensing elements with amplifier and signal conditioning circuit or a digital/smart sensor, a microcontroller unit, modulator and transmitter with antenna, and a battery....
IoT projects can be fun and a great learning experience for budding programmers. Due to the pandemic, most of us are still stuck at home. This can be a great opportunity to dive into some DIY projects to enhance...
The oil in lamps that are traditionally lit in a pooja room has to be topped up from time to time. The solar lamp described here can provide light nonstop for many years without any intervention. In this system, a...
With path-breaking progress in UAV technology, drones are now being readily adopted and deployed for several uses. But despite the advancement, many physically challenged people are unable to operate them due to certain limitations in maintaining drone stability in...
This LED desk lamp can be switched on or off from a distance using Bluetooth. You can even regulate the lamp’s brightness through a slider on the screen of your Android smartphone. The key hardware required for this little project...
This low-cost, simple, reliable, and effective circuit for a doorbell works without touching. It can be quite useful in our post-Covid-19 world as it minimises the spread of virus through doorbells. Circuit and working The author’s prototype is shown in Fig. 1....
White noise is widely used during the testing of preamplifiers, filters, power amplifiers, etc. So white noise generators are required at least for the audio signal range. These generators exist in the market but usually are quite expensive. Here...
This simple shortwave transmitter is easy to construct and can be used to transmit speech on the lower shortwave (SW) band of 5MHz to 12MHz with appropriate choice of crystals. It is a good project for a beginner. Circuit and...
Racing drones are fast and can therefore cover long distances quickly. We can use racing drones for other applications as well such as public announcement as described in this article. The KK.2.2 flight controller used in ‘Make Your Own...