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Global positioning system (GPS) is a wonderful technology that has made navigation systems highly accurate and efficient in recent years. All the mobile phones these days come with an in-built GPS receiver through which you can easily find out...
NTC thermistors are often the preferred choice for temperature sensing and control in many applications, primarily because of their small package sizes and attractive price-performance ratios. An NTC thermistor’s sensitivity to temperature changes, even in small increments, enables the...
The circuit presented here can be used as a lock for important electronic and electrical appliances. When a card is inserted inside its mechanism, depending upon the positions of the holes punched on the card, a particular appliance is...
Assemble yourself a portable, four-channel multi-mode light controller using an Arduino Uno board and very few external components. The fancy lights controller described here is built around the Arduino (an Open Source single-board microcontroller) platform that can be purchased in...
This PIC16F877A microcontroller-based quiz controller, designed for up to six players or teams, is suitable for school and college quiz competitions. It is similar to a fastest-finger-first system in which the player who presses the button first gets the...
Today, there are many gadgets available with GPS technology. GPS stands for ‘global positioning system.’ It provides the data corresponding to the position of the GPS receiver itself on international-standard latitude-longitude basis, in addition to the standard coordinated universal...
Digital compass and protractor are two of the most basic tools for specifying directions and measuring angles. But sometimes it is difficult to get accurate angle measurement for certain structures and geometrical shapes using these traditional tools, for example,...
RS232 signals cover a much longer distance than standard TTL and I2C signals. Also, RS232 signals have better noise immunity. RS232 is a well-known standard supported by many popular integrated circuits (ICs) and therefore is still widely used. Sometimes...
Despite being more expensive than standard permanent outdoor toilets, portable toilets (Fig. 1) have several significant benefits as these are self-contained and can be placed almost anywhere. These days portable toilets are frequently seen at outdoor areas like construction...
The circuit presented here uses a crystal oscillator and frequency multiplier to generate a highly-stable carrier signal frequency of 96MHz. With 40mW of RF output, it can be used to transmit voice or music up to hundred metres. The circuit...