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2 layers20.8 × 15 mmMicrophone, the printed circuit board in 3D

Microphone

satomm1/Robot

This directory contains the electrical schematic for a breakout board for the Bosch BMI323 6-axis IMU. This IMU provides a 16 bit digital triaxial accelerometer, a 16 bit digital triaxial gyroscope, and a 16 bit digital…

Size
20.8 × 15 mm
Copper layers
2
Thickness
1.65 mm
Parts
5
Nets
6
Pads
17
Tracks, vias
18, 0
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
8 Nov 2023
Updated
22 Oct 2026

Overview

Microphone is an open-source printed circuit board by satomm1, from the satomm1/Robot repository on GitHub, published under the MIT licence. It is a 2-layer board of 20.8 × 15 mm with 5 parts on 6 nets, routed with 18 tracks and 0 vias.

It is built around the ICS-43434. Its parts include 1 capacitor and 1 connector. It belongs with the audio and music and sensors and measurement boards of this library.

Main components

1

README

Electrical/IMU_Breakout/README.md

6-axis IMU

This directory contains the electrical schematic for a breakout board for the Bosch BMI323 6-axis IMU. This IMU provides a 16 bit digital triaxial accelerometer, a 16 bit digital triaxial gyroscope, and a 16 bit digital temperature sensor.

This breakout board is designed so that the IMU can be placed anywhere that is convenient.

Soldering the IMU

This IMU is in a QFN package, which means the device should be reflow soldered. Alternatively, you can carefully apply solder to the PCB pads, put the IMU on top, and use a heat gun to solder the IMU.

Pin directions

The header pins should be soldered on the bottom of the PCB:

IMU Breakout Board

Installing the IMU

The assembly is meant to be installed on the robot with the IMU facing upwards. The positive X/Y/Z axes are designated on the board. The IMU should be connected via wire to the designated header on the main control board:

IMU Breakout PinMain Control Board Connection
3V33.3V
GNDGND
SCKSCK
CSCS
SDOSDI
SDISDO
INT1INT1 (Currently Unused)
INT2INT2 (Currently Unused)

The IMU connection on the main control board is indicated below:

Main Board with IMU Pins Highlighted

Parts

5
QtyValueFootprintReferences
2MountingHoleMountingHole:MountingHole_3.2mm_M3H1, H2
10.1 uFCapacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC1
1Conn2MCUcustom_footprints:CONN_22-05-3061_MOLJ1
1ICS-43434Library:MIC_ICS-43434MK1

Questions

How big is the Microphone PCB?

It measures 20.8 × 15 mm and has 2 copper layers, 1.65 mm thick.

What parts does the Microphone use?

5 parts, built around the ICS-43434. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Microphone KiCad files?

From the satomm1/Robot repository on GitHub, at the commit this page was made from: the board is Electrical/Microphones/microphone/microphone.kicad_pcb and its schematic Electrical/Archives/V0.1/MainBoard/Buttons.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Microphone design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

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