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Audio

directionizer·df-pcb·audio/audio.kicad_pcb

Audio PCB layout, top view — open source AVR/Arduino board by directionizer

About the Audio PCB

Audio is an open source AVR/Arduino PCB design by directionizer, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 64 × 64 mm, with 62 components from 34 distinct parts.

Its main chip is the ATMEGA328P-AU, from the AVR/Arduino family. Other key parts include the CH340G. By type, the board carries 29 resistors, 22 capacitors, 3 connectors, 3 microphones, 3 diodes and 2 ICs.

It belongs with the audio designs in this gallery.

From the project

Schematics and design files for a handheld device to locate an audio beacon

Directionizer is a student project by Mason Ahner, Jared Beller, and John Fiorini for the spring 2021 session of ECE 2804 at Virginia Tech. The "directionizer" is a handheld device for locating a 1 kHz audio beacon. This repository contains KiCad schematics and PCBs for the directionizer hardware.

The original design made during prototyping can be found in schematic. This was broken into three individual boards, which are stacked to form the final device. From bottom to top, the boards are processing, audio, and display. Each board's schematic and layout is in it's respective folder. For…

Main components on the Audio

CH340GATMEGA328P-AU

Audio bill of materials (BOM)

62 components, 34 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH340G
LM324DT
U1
1
ATMEGA328P-AU
LM324DT
U2
1
Conn_01x02
J1
1
Conn_01x03
J2
1
Conn_01x05
J3
3
Microphone
MK1, MK2, MK3
3
D_Schottky_Small
D1, D2, D3
1
22PF
100nF
C1
1
10NF
100nF
C2
5
22PF
2.2uF
C3, C9, C10, C15, C21
1
100NF
10uF
C4
2
100NF
22pF
C5, C11
3
100NF
4.7nF
C6, C8, C12
1
100NF
2.2uF
C7
2
2.2UF
2.2uF
C13, C19
1
10UF
4.7nF
C14
2
4.7NF
2.2uF
C16, C22
1
2.2UF
22pF
C17
1
4.7NF
4.7nF
C18
1
2.2UF
4.7nF
C20
Show 14 more
QtyPartRefs
2
5.1K
100k
R1, R2
3
12K
150k
R3, R12, R21
1
8.2K
5.6k
R4
1
430k
R5
1
10K
12k
R6
3
100K
220k
R7, R16, R25
1
100K
51k
R8
3
2.7k
R9, R18, R27
3
5.6K
100k
R10, R19, R28
3
430K
3k
R11, R20, R29
2
220K
5.6k
R13, R22
2
51K
430k
R14, R23
2
2.7K
12k
R15, R24
2
51k
R17, R26

Audio design files

The KiCad project lives in the directionizer/df-pcb repository on GitHub; these links point at the commit this page was built from.

Audio: common questions

What microcontroller does the Audio use?

The Audio is built around the ATMEGA328P-AU, from the AVR/Arduino family.

How big is the Audio PCB?

The Audio measures 64 × 64 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Audio?

62 components, from 34 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 Audio design files?

From the directionizer/df-pcb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Audio design in my own project?

Yes, under the terms of its GPL-3.0 license, which directionizer chose for the repository.

Can I test firmware for the Audio without the hardware?

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

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