DETECTOR FOR SENSING FAULTY TV VIDEO AND AUDIO SIGNAL VIA NOTIFICATION SYSTEM ON LINE APPLICATION

Abstract

This paper presents the detector for sensing faulty TV video and audio signals via notification system of Line application based on the microcontroller. The principle of this detector was to detect the vertical sync signal which was sent along with the video signal. If the video signal was lost, the detector would not be able to detect a vertical sync signal. Likewise, if there was no audio signal, the sound would be silent and the signal level would be at zero volts. In either case, whether it was the loss of video or audio signal, as well as when the TV transmitter failed to broadcast, the buzzer with built-in frequency generator would generate an alarm immediately. In addition, when there was a loss of video or audio signal, the indicator lamp of the detector would light up. The delay time of buzzers and indicator lamps could be changed by adjusting the VR1 or VR2 respectively. When the detector for sensing faulty TV video signal and audio signal via notification system of Line application was connected to the wireless internet signal and the NodeMCU ESP8266 microcontroller board was connected successfully, the indicator lamp would light up. From the experiment, it was found that the detector for sensing faulty TV video signal and audio signal via notification system of Line application could work very well according to the objective of this research.