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Description:
This project is a proof-of-concept device thattransmits an audio signal using a laser beam, while removing the need for theuser to align the beam themselves.
A mono-axial transmitter/receiver setup iscreated that converts an analog audio signal, via a standard 3.5mm jack, andtransmits it via a laser to a receiver, which converts the signal back intoaudio. The receiver can be rotated within its horizontal plane, and uses aservo motor controlled by a micro-controller to automatically align it with thereceiver. The end result is a wireless audio signal that cannot be “overheard”by other devices.
Entire project can be divided into 2 sections:
- audio transmission via hardware
- alignment control via software
The above two tasks are mutually dependent foroverall functionality.
The alignment is accomplished using a servomotor to rotate the transmitter until it aligns with the receiver. This is doneby detecting the light emitted from the receiver’s laser using aphototransistor. The transmitter scans over its free range until it finds thereceiver, at which point the transmitting laser is turned on and the audiosignal is picked up by an array of photodiodes.
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