A low cost wireless TV audio transceiver
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Wireless communication is rapidly growing, making it possible to design wireless network systems that can constantly collect, analyze, evaluate and validate our environment to get more control of the factors that influence it. With over a decade of intensive research and development, wireless sensor network technology has been emerging as viable solution to many innovative applications. Various audio wireless consumer devices have been developed over years. But these wireless TV headphones use Bluetooth technology which comes with a number of drawbacks; high power consumption, high cost, short distance coverage and limited number of users at time. In this project, we have developed a wireless TV audio transceiver (transmitter to multiple receivers) using Arduino and nRF24L01 module. The nRF24L01 transceiver module uses the 2.4 GHz band and it can operate with band rates from 250 kbps up to 2 Mbps. If used in closed space and with lower band rate its range can reach up to 100 meters. The Wireless audio system operates at Radio Frequency (RF) signals. Specifically, it utilizes IEEE802.15.4 standard to transmit the audio signals. The system is designed to transmit and receive the audio signal about 2.4Ghz frequencies. The system is powered using a 9Vdc battery. The Wireless audio system utilizes IEEE802.15.4 Radio Frequency (RF) standard to transmit the audio signals. IEEE standard 802.15.4 offers the fundamental lower network layers of a Wireless Personal Area Network (WPAN) and focuses on low-cost, low-power communication between devices. The system will be designed to transmit and receive the audio signal using 2.4Ghz band. The transmitter converts the input analog signal from the TV audio socket to digital signal using the microcontroller. The digital signal will then be sent to the nRF24L01 module which modulates it using Gaussian Frequency Shift Keying (GFSK) modulation scheme and transmits it at 2.4GHz. The receivers use GFSK modulation to demodulate the digital signal received and convert it to an analog signal using the microcontroller. The analog signal is amplified by LM386 circuit where users can individually modulate the volume of sound of their preferences. LM386 is a low voltage audio amplifier and frequently used in battery powered music devices. Overall system architecture and the design of hardware and software components are presented in details in this paper.