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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...
Some breadboard power supplies have adjustable voltage linear regulators to control the required output voltages. Efficiency of the linear regulators decrease as output power increases. Presented here is a circuit that uses a switch-mode regulator to regulate output voltage. This...
Here is a simple 4W audio stereo power amplifier using a ten-pin LA4601 IC. Only a few passive components, including ceramic and electrolytic capacitors, are used in this circuit. The 9V DC power supply helps obtain 4W stereo output. The...
This project deals with the implementation of a process monitoring system using Arduino and MATLAB graphical user interface (GUI). One of the major application areas in instrumentation engineering deals with monitoring of various process parameters such as temperature, pressure,...
Battery-life measurement for a portable system is a time-consuming task and many methods used for it do not give reliable results. Presented here is a circuit using which you can measure the battery-life very easily. Here, an analogue clock...
Presented here is a robust, compact and hand-held mini rechargeable power supply that delivers 9.2V and 5V up to 1A (approx.) and 3.3V up to 500mA. It also includes a female A-type USB connector so you can power and...
Traditional key-based locks are now outdated and come with limitations of their own. First, you always have to carry the key with you, and the key might get misplaced or stolen. Such locks are not completely secure either. These old...