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OTTOtact

cester-ino·OTTO-project·OTTO-old/OTTOtact.kicad_pcb

OTTOtact PCB layout, top view — open source AVR/Arduino board by cester-ino
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About the OTTOtact PCB

OTTOtact is an open source AVR/Arduino PCB design by cester-ino, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 307 × 131.2 mm, with 224 components from 48 distinct parts.

Its main chip is the ATMEGA32U4-AU, from the AVR/Arduino family. Other key parts include the 74HC125, LM3914, TJCTM24028-SPI, MCP602 and TP4056. By type, the board carries 83 diodes, 53 switches, 34 capacitors, 32 resistors, 9 ICs and 8 connectors.

It belongs with the audio and power & battery designs in this gallery.

From the project

A modular hardware for the OTTO synthesizer

- 50 key button matrix - 4 clickable color coded encoders - 1W Audio amplifier for the internal speaker - Battery management and charging circuit for the lipo/li-ion batteries and a led battery meter - Gpio breakout to allow to position the Raspberry rotated 90 degrees to access the USB ports and to easely use both the LCD screen and the audio card.

OTTOtact, from the project README
From the project README

Main components on the OTTOtact

74HC125LM3914ATMEGA32U4-AUTJCTM24028-SPIMCP602TP4056FS312F-GMT3608OTTO-dac

OTTOtact bill of materials (BOM)

224 components, 48 distinct parts.

QtyPartRefs
1
74HC125
IC1
1
LM3914
IC2
1
ATMEGA32U4-AU
U1
1
TJCTM24028-SPI
U2
1
MCP602
U3
1
TP4056
U4
1
FS312F-G
U5
1
MT3608
U6
1
OTTO-dac
U7
1
FS8205
M1
1
2N7000
Q1
1
16mhz
Y1
1
USB
J1
1
gpio_exp2
J2
1
Conn_01x04_Male
J3
1
gpio_exp1
J4
1
USB_B_Micro
J5
1
battery
J6
1
Conn_01x06
J7
1
Conn_01x02
J8
Show 28 more
QtyPartRefs
1
10K
RV1
52
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +44
1
ON_OFF_SWITCH
SW57
1
LED
D1
56
1N4148
D2, D3, D4, D5, D6, D7, D8, D9 +48
1
SS34
D60
5
LED_Small
D61, D62, D63, D64, D65
17
WS2812B
D66, D67, D68, D69, D70, D71, D72, D73 +9
3
IN4001
D83, D84, D85
1
22uH
L1
28
0.1uF
C1, C5, C6, C7, C8, C9, C10, C11 +20
1
1uF
C2
2
22pF
C3, C4
1
10uF
C12
2
22uF
C14, C15
14
10K
R1, R3, R4, R5, R6, R7, R8, R9 +6
1
330K
R2
2
1.5K
R13, R15
1
470K
R14
1
820K
R16
5
1K
R17, R19, R20, R21, R26
1
15K
R18
1
2k
R22
2
100K
R23, R28
1
2.7k
R24
1
7.5K
R25
1
4.7K
R27
1
330
R29

OTTOtact design files

The KiCad project lives in the cester-ino/OTTO-project repository on GitHub; these links point at the commit this page was built from.

OTTOtact: common questions

What microcontroller does the OTTOtact use?

The OTTOtact is built around the ATMEGA32U4-AU, from the AVR/Arduino family.

How big is the OTTOtact PCB?

The OTTOtact measures 307 × 131.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OTTOtact?

224 components, from 48 distinct parts. The full bill of materials is listed on this page.

Where can I download the OTTOtact design files?

From the cester-ino/OTTO-project repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the OTTOtact design in my own project?

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

Can I test firmware for the OTTOtact 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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