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OTTO-main

cester-ino·OTTO-project·OTTO-main/OTTO-main.kicad_pcb

OTTO-main PCB layout, top view — open source STM32 board by cester-ino

About the OTTO-main PCB

OTTO-main is an open source STM32 PCB design by cester-ino, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 239 × 80 mm, with 100 components from 27 distinct parts.

Its main chip is the STM32F103CBTx, from the STM32 family. Other key parts include the 74HC125, AMS1117-3.3, ILI9341 and MCP602. By type, the board carries 30 diodes, 26 switches, 19 resistors, 14 capacitors, 5 ICs and 4 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.

OTTO-main, from the project README
From the project README

Main components on the OTTO-main

74HC125AMS1117-3.3STM32F103CBTxILI9341MCP602

OTTO-main bill of materials (BOM)

100 components, 27 distinct parts.

QtyPartRefs
1
74HC125
IC1
1
AMS1117-3.3
U1
1
STM32F103CBTx
U2
1
ILI9341
U3
1
MCP602
U4
1
8mhz
Y1
1
POWER_BOARD
J1
1
AUDIO_BOARD
J2
1
Raspberry_Pi_2_3
J3
1
MICROPHONE
J4
26
SW_SPST
SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12 +18
4
1N4148
D1, D2, D3, D4
26
D_ALT
D5, D6, D7, D8, D9, D10, D11, D12 +18
1
30ohm
L1
1
10uf
C1
1
22uf
C2
4
1uf
C3, C4, C5, C6
1
10nf
C7
2
22pf
C8, C9
5
0.1uF
C10, C11, C12, C13, C14
Show 7 more
QtyPartRefs
2
4.7K
R1, R2
10
10K
R3, R4, R5, R6, R7, R8, R9, R10 +2
2
1.5K
R13, R15
1
470K
R14
1
820K
R16
2
1K
R17, R19
1
15K
R18

OTTO-main 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.

OTTO-main: common questions

What microcontroller does the OTTO-main use?

The OTTO-main is built around the STM32F103CBTx, from the STM32 family.

How big is the OTTO-main PCB?

The OTTO-main measures 239 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OTTO-main?

100 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the OTTO-main 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 OTTO-main 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 OTTO-main 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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