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Presented here is an Internet of Things (IoT)-based controller for a smart home. This project can be used to control any four home electrical appliances such as lights, fans, air-conditioners and water pumps from the smartphone. In this project, we...
‘Please Keep Silence!’ You must have seen this message written in such places as libraries and offices. But some people tend to, intentionally or unintentionally, make noise in such silence zones, disturbing others. What if there was a device...
Increasing water consumption and wastage is leading to water scarcity. While a large population has no safe drinking water, some people use a lot of water on daily basis and waste it. This project is of a smart water meter...
This article presents a simple, low-cost audio amplifier with three channels built around two TEA2025 ICs. The amplifier works from an AC or a DC power supply in the range of 3V to 12V (max. 15V). This audio amplifier has...
Here we put all the theory to work and present a simple power amplifier module that can be easily built with readily available components. The block diagram of the amplifier is shown in Fig. 1. It is typical of...
Presented here is a simple humidity controller and indicator. In industries such as textile, the change in moisture content has a direct impact on the properties of fabric, such as tensile strength, elasticity, fibre diameter and friction. Therefore the...
Electromyography (EMG) is a technique of recording muscular activities by measuring the potential difference across a muscle of interest. EMG signal acquisition is the latest trend as it paves way for a new method of human-machine interface (HMI). Here,...
This circuit uses a NE555 timer IC, some LEDs, a couple of piezo buzzers and a few other components to produce audio-visual effects as per your requirement. The timer NE555 and its equivalents are widely used for all sorts...
A lot of accidents happen every day due to drunk driving. This is a very useful circuit for testing whether a driver is drunk or not. The circuit is easy to use, inexpensive and indicates various levels of alcohol...
Normally, ATMEL’s AVR microcontrollers are programmed using programmers. There are many ways to program the AVR microcontrollers, such as in-system programming, parallel programming and using bootloader. Advantage with the bootloader method is that you don’t need any external hardware...