Wireless Equipment Control Using AT89C51
Here is a microcontroller based wireless equipment controller that can switch on or switch off up to four devices at a desired time interval...
PC-Based Wireless Control for Toy Car
Here we show how you can control a toy car through your PC’s serial port using a pair of ASK transmitter and receiver modules....
Remote-Controlled 6-Camera CCTV Switcher
Closed-circuit television (CCTV) uses video cameras to transmit signals to specific monitors. It differs from broadcast television in that the signal is not openly...
Microcontroller-Based Serial Data Transfer To PC
Communication from or to a computer has become almost essential in our day-to-day lives. Though we can execute many programs within a computer itself,...
RPM Counter Using Microcontroller AT89C4051
Counting the revolutions per minute (RPM) of motors—determining the motor speed— is essential in the field of industrial automation. It is useful especially for...
JOIN THE LED LIGHTING REVOLUTION
Light-emitting diodes (LEDs) produce a radically different type of lighting than what we are used to. Already in use in many architectural and commercial...
Automatic Fan Controller For Air-conditioners
Many central air-conditioning systems (ACs) have the option for cooling and heating both. These have a fan for blowing hot or cold air drawn...
SMPS Spark Suppressor
This circuit protects the power plug of a switched-mode power supply (SMPS) against sparks that may damage its contact terminals. It normally happens when...
Security Alarm
Thwart any attempt of burglary in your house using this alarm circuit. When someone opens the door of your room, it sounds an alarm...
Dual-Tone Horn
This circuit generates two different frequencies and mixes these to produce a balanced ringing tone, which can be used in burglar alarms or call...