Microcontroller-Based Ring Tone Player
Mobile phone ring tones sound like real audio recordings. It’s not because of the way the melodies are composed, but the protocol behind playing...
Put Coin And Draw Power
Built on the lines of payphones, here is an automatic coin collection device for payloads like lamps and air-conditioners to be used on a...
Cellphone-Based Device Control With Voice Acknowledgement
Here is a circuit that lets you operate your home appliances like lights and water pump from your office or any other remote place....
PIC16F877A-Based Temperature Monitoring System
Temperature monitoring and control is important in industry environments. Sensors are widely used for measurement of temperature. Usually, a temperature sensor converts the temperature...
Eight Channel Data Acquisition And Logging System
In environments like factories, power plants and transformers in electricity substations, controlling temperature to a safe value is important. Supervisory and control systems are...
Microcontroller-Based Moving Message Display
LED-based moving-message displays are becoming popular for transmitting information to large groups of people quickly. These can be used indoors or outdoors. We can...
Secure Digital Access System using iButton
Access control forms a vital link in a security chain. Here we describe a secure digital access system using iButton that allows only authorised...
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...