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Described here is an easy-to-use circuit of an automatic infrared (IR) faucet controller suitable for hand hygiene and water conservation at homes, hospitals and offices. With this compact controller you can turn on and off a faucet automatically, preventing...
Electronics projects are always in high demand. Students work on them to improve their skills, whereas hobbyists like the fun in meddling with technology. For professionals, it’s a different ball game altogether. Mini projects form a middle ground for...
AC switches are silicon devices that control AC loads directly connected to the AC mains. This means that the driving reference terminal of the AC switch can be connected to the Line potential. This circuit explains the need for...
Op-amps require dual-polarity supply for proper operation. When working with battery supply, it becomes difficult to get dual power supply for the op-amps. Presented here is a simple circuit that provides ±5V from a 9V battery. Circuit and working The...
An inverter turned into an emergency power system, which turns on when the mains supply fails, and more importantly doesn’t turn on when the main supply is available. Can you give me a setup (emergency lighting system) where few of...
When recording sound from several orchestral instruments being played by different musicians using a single microphone, the only way to adjust the sound balance is to change the position of the musicians relative to the microphone. When recording direct...
A light-dependent resistor (LDR) whose resistance is inversely proportional to the intensity of light is often used as a sensor in electronic projects that involve the use of light. This project uses an LDR to control the speed of...
Presented here is a GPS based vehicle tracking system based on the ATMega16 microcontroller using global positioning system (GPS) and global system for mobile communication (GSM). Contents An introduction to GPS based vehicle tracking system GPS based vehicle tracking system:...
A 3 phase motor programmable controller that automatically turns on/off controller can be made with a programmable time switch. In this case, a maximum of eight-time duration can be programmed. The system has two programmable time switches for setting...
This circuit can be used to detect big over-height vehicle moving towards bridges, tunnel entrances and overhead structures, and warn the drivers. It can be developed for monitoring such a vehicle approaching, say, a bridge at night. The vehicle detection...