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parametric_speaker

(★ 99)

A directional speaker with a driver based on STM32

파일 탐색기

최종 버전 다운로드 (.zip)

- - config.toml
- - main.rs
- .gitignore
- Cargo.lock
- Cargo.toml
- memory.x
- array.jpg
- - DC-DC Buck.kicad_mod
  - mouse-bite-1mm-slot.kicad_mod
  - mouse-bite-2.54mm-slot.kicad_mod
  - mouse-bite-2mm-slot.kicad_mod
  - mouse-bite-3mm-slot.kicad_mod
  - mouse-bite-5mm-slot.kicad_mod
  - PCM1808_Module.kicad_mod
  - PG-DSO-8-70-L.kicad_mod
  - PG-DSO-8-70-M.kicad_mod
  - PG-DSO-8-70.kicad_mod
  - Power_Pads.kicad_mod
  - STM32F411_Black_Pill.kicad_mod
  - TCT40-16T.kicad_mod
- - MiniF4x1Cx_V31_3D.step
  - PG-DSO-8-70.step
  - transducer.step
- - fp-lib-table
  - speaker_driver.kicad_pcb
  - speaker_driver.kicad_pro
  - speaker_driver.kicad_sch
  - ~speaker_driver.kicad_pcb.lck
  - ~speaker_driver.kicad_sch.lck
- - 2ED2103S06FXUMA1.kicad_sym
  - PCM1808_Module.kicad_sym
  - WeAct_Black_Pill_V2.0.kicad_sym
- .gitignore
- fp-lib-table
- parametric_speaker.kicad_pcb
- parametric_speaker.kicad_pro
- parametric_speaker.kicad_sch
- place_footprints.ini
- place_footprints.log
- sym-lib-table
- transducers.kicad_sch
README.md

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/Orange-Murker/parametric_speaker

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd parametric_speaker

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. Rust

보통 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
Rust (rustup) rustup으로 설치하면 cargo도 함께 설치됩니다.

cd code

이 프로젝트의 관련 파일이 하위 폴더 안에 있어서, 먼저 그 폴더로 이동합니다.

cargo build --release

Rust 프로젝트를 컴파일합니다.

cargo run

빌드 후 바로 실행까지 진행합니다.

✅ cargo build가 에러 없이 끝나면 성공입니다. target/ 폴더에 실행 파일이 생성됩니다.

// repository documentation

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# Parametric Speaker

![Array](https://raw.githubusercontent.com/Orange-Murker/parametric_speaker/main/images/array.jpg)

## What is this?

This is a directional speaker based on a parametric array of 95x 16mm 40kHz ultrasonic transducers.

The driver part of this design is currently only a working proof of concept and has some issues.
It consists of a single H-bridge directly driving the transducers with a 40kHz square wave without any additional filtering or matching.
The MOSFETs get really hot during the operation.

## Phase matching

Some transducers come with their polarity flipped even if they are from the same batch.
Thus it is important to match the phase of all of the transducers using the steps below:

1. Connect an oscilloscope to the receiver
2. Supply a 40kHz sine wave to the transducer
3. Physically align the transducer and the receiver in such a way that the wave supplied to the transducer has the same phase as the signal coming from the receiver
4. You now can mark the + and the - signs on this transducer-receiver pair and use it as the new reference.
5. Place a new transducer at the same distance from the receiver as the previous one and see if the phase is approximately the same between the two signals
6. If the phase does not match, flip the polarity of the transducer and it should now match
7. Insert the transducer into the PCB making sure that you insert it with the correct polarity according to the reference transducer polarity marked in step 4
8. Repeat steps 5-7 until you run out of transducers

## Additional Notes

The PCB assumes that the transducer bodies are electrically isolated from each
of the 2 pins. Not checking this may result in an unusable array due to a short.
Get transducers with a plastic housing if you want to avoid this.