Visible light communication (VLC) system is a wireless communication from light of the light emitting diode (LED). In this work, we design the voltage reference comparator circuit method for the ...

The receiver is equally simple and also based on a CMOS 555. As long as the sensor picks up infrared light from the transmitter, the reset input of the 555 IC is held low and the buzzer is silent.

Visible Light Communication (VLC) system is an alternative to replace traditional physical and online examination. It provides secure communication, energy efficient and cost-effective as the usage of ...