HardLabs

Microphone

joshitha-c·microphone

Microphone PCB layout, top view — open source RP2040/RP2350 board by joshitha-c

About the Microphone PCB

Microphone is an open source RP2040/RP2350 PCB design by joshitha-c, published on GitHub. It is a 2-layer board measuring 33.3 × 36.5 mm, with 28 components from 16 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the USBLC6-2P6, W25Q128JVE and LD1117S12TR_SOT223. By type, the board carries 11 capacitors, 6 resistors, 4 ICs, 2 connectors, 2 switches and 1 crystal.

It belongs with the audio and iot & wireless designs in this gallery.

From the project

A compact USB digital microphone development board built around the Raspberry Pi RP2040 microcontroller and the STMicroelectronics MP34DT05TR-A digital MEMS microphone.

A compact USB digital microphone development board built around the Raspberry Pi RP2040 microcontroller and the STMicroelectronics MP34DT05TR-A digital MEMS microphone.

The board captures audio using a PDM microphone, converts it to PCM on the RP2040, and streams audio over USB to a host computer. It serves as a reference platform for USB Audio Class (UAC) applications, embedded audio processing, and voice-enabled IoT projects.

Microphone, from the project README
From the project README

Main components on the Microphone

USBLC6-2P6W25Q128JVELD1117S12TR_SOT223RP2040

Microphone bill of materials (BOM)

28 components, 16 distinct parts.

QtyPartRefs
1
USBLC6-2P6
U1
1
W25Q128JVE
U2
1
LD1117S12TR_SOT223
U3
1
RP2040
U5
1
12MHz
Y1
1
USB_C_Receptacle_USB2.0_16P
J1
1
Conn_01x04
J2
1
MP34DT05TR-A
ST(意法半导体)
MIC1
2
SW_Push
SW1, SW2
1
600Ω
FB1
2
10uF
C3, C8
6
100nF
C4, C6, C10, C11, C13, C15
2
12pF
C5, C7
1
1uF
C14
2
5.1k
R6, R7
4
10k
R9, R10, R11, R12

Microphone design files

The KiCad project lives in the joshitha-c/microphone repository on GitHub; these links point at the commit this page was built from.

Microphone: common questions

What microcontroller does the Microphone use?

The Microphone is built around the RP2040, from the RP2040/RP2350 family.

How big is the Microphone PCB?

The Microphone measures 33.3 × 36.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Microphone?

28 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Microphone design files?

From the joshitha-c/microphone repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Microphone design in my own project?

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

Can I test firmware for the Microphone without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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