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Sound Direction Sensor

meerstern·Sound_Direction_Sensor·PCB/ssl.kicad_pcb

Sound Direction Sensor PCB layout, top view — open source STM32 board by meerstern

About the Sound Direction Sensor PCB

Sound Direction Sensor is an open source STM32 PCB design by meerstern, published on GitHub. It is a 2-layer board measuring 40 × 40 mm, with 53 components from 16 distinct parts.

Its main chip is the STM32F411RETx, from the STM32 family. Other key parts include the LD3985M33R_SOT23 and SPH0641LU4H. By type, the board carries 20 resistors, 13 capacitors, 9 diodes, 6 ICs and 3 connectors.

It belongs with the sensors designs in this gallery.

From the project

This board detects the direction of sound with 4-pdm mems mic using GCC-PHAT algorithm.

Sound Direction Sensor vX.X (ビルド日時)[\r\n] Activity Threshold: 1.0[\r\n] Deg:-1.0, DegOrg:201.8, Act:0.69,[\r\n] Deg:-1.0, DegOrg:0.0, Act:0.71,[\r\n] Deg:-1.0, DegOrg:90.0, Act:0.73,[\r\n] Deg:206.6, DegOrg:206.6, Act:1.60,[\r\n] Deg:-1.0, DegOrg:90.0, Act:0.73,[\r\n]

※オフセット0x04で設定値のHighByteとLowByteの2バイトを一度で書き込んでください (スレーブアドレス)+(オフセット)+(設定値2Byte)

[2]: https://www.switch-science.com/products/8129

Sound Direction Sensor, from the project README
From the project README

Main components on the Sound Direction Sensor

LD3985M33R_SOT23STM32F411RETxSPH0641LU4H

Sound Direction Sensor bill of materials (BOM)

53 components, 16 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LD3985M33R_SOT23
U1
1
STM32F411RETx
U2
4
SPH0641LU4H
U3, U4, U5, U6
1
GROVE
J1
1
UART
J2
1
SWD
J3
2
R_POT
RV1, RV2
9
LED
D1, D2, D3, D4, D5, D6, D7, D8 +1
2
2.2u
C1, C3
1
0.01u
C2
9
0.1u
C4, C5, C6, C7, C8, C9, C10, C12 +1
1
4.7u
C11
2
20k
R1, R2
9
1k
R3, R4, R5, R6, R11, R12, R13, R14 +1
4
10k
R7, R8, R9, R10
5
10
R16, R17, R18, R19, R20

Sound Direction Sensor design files

The KiCad project lives in the meerstern/Sound_Direction_Sensor repository on GitHub; these links point at the commit this page was built from.

Sound Direction Sensor: common questions

What microcontroller does the Sound Direction Sensor use?

The Sound Direction Sensor is built around the STM32F411RETx, from the STM32 family.

How big is the Sound Direction Sensor PCB?

The Sound Direction Sensor measures 40 × 40 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sound Direction Sensor?

53 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Sound Direction Sensor design files?

From the meerstern/Sound_Direction_Sensor repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Sound Direction Sensor design in my own project?

The repository has no license, so all rights stay with meerstern. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Sound Direction Sensor without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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