Ultrasonic Projector

Overview:

This project uses an array of ultrasonic transducers emit a directional sonic beam which will cause the sound to appear to originate from the target.

Description:

This project allows an array of 91 Ultrasonic Transducers (TCT40-16T) arranged in a hexagonal pattern to transmit a 40khz directional sonic beam, modulated using software-based FM, which will demodulate upon hitting a target, resulting in the sound appearing to originate from the target. 

Features:

• ESP32 WROOM 32E and ESP32S2 microcontroller compatibility

• Youtube Link to MP3 File Streaming

• 12-Bit DAC Channel control using software-based frequency modulation

• Software MP3 File Decoding + Decomposition

• Audio file buffering for MP3 file conversion using DAC Channel

• Selectable Carrier Frequencies and Waveforms

• Dual power inputs USB-C or LiPo Batteries with smart power switching

• USB-C Power Delivery controlled by microcontroller (5-100W)

• Rechargable battery charging circuit (LiPo, Li-ion, NiMH, NiCd, LiFePO4) (2s-4s)

• MQTT Protocol for IoT audio integration

• PCB Status LED Control

• Decoupling capacitors and ESD diodes for high voltage, overcurrent, and reverse polarity protection

• Expansion slots for future PCBs (sound reactive lighting, collumating lasers, external DAC up to 32-bits)

• Impedance matched traces for maximizing power efficiency

• Threaded rod inserts for 3D Printed handle and acoustic lens attachments

• Use of modal frequency analyses and generative design to select PCB thickness and create mechanical structure design to reduce vibrations