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Presented here is the design of a low-cost Gauss meter using a linear Hall effect sensor and a standard alkaline battery. A Gauss meter is used to measure the strength of a magnetic field. Here, in order to make...
This Global Positioning System (GPS)-based timer is used to turn on and turn off a radio receiver at a specific time. The GPS clock works as the timer for turning on and turning off any digital or analogue radio...
Presented here is a microcontroller-based special-purpose programmable interval timer for live shows and competitions to record time while the contestants are performing. The main objective of this project is to design an accurate programmable interval timer that can be...
Several articles about water-level controllers for overhead tanks have been published in earlier issues of EFY magazine. But the project we are going to share today is new and unique. So presented here is a Web-based water-level monitor and...
This simple circuit can be used to light a small area at night. It is useful as a nifty bedroom night lamp, but it can also be used for other applications. The circuit is versatile and fully-automatic but draws...
We have seen many projects where a robot is controlled by a remote controller. Here we describe a robot (robocar) that can be steered in any direction just like you drive your car. Wireless steering senses the motion and...
Shadow alarms are usually used for protection against theft. A shadow alarm is a device that sounds an alarm when a shadow falls on it. Described here is a simple circuit of an Arduino-based shadow alarm. This compact shadow...
Arduino is a perfect mindless slave. Give it a job and it performs the task endlessly without defaulting even for a nano second. On the other hand, Raspberry Pi, or Raspi, is a computer that has a brain of...
Theft at a museum means more than just the loss of an object, as it affects the historical, artistic and scientific value of the collection as a whole. A museum watchdog is a unique security alarm system, designed specifically...
Stroboscope is a convenient and accurate enough instrument to measure speeds of rotating objects in homes or industries. One can use it to find the speed of fans, motors or any other rotating object. Stroboscope is nothing but a flashing...