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OTTO-main

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

OTTO-main PCB layout, top view — open source STM32 board by cester-ino
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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 4-layer board measuring 247 × 81 mm, with 142 components from 20 distinct parts.

Its main chip is the STM32F103RETx, from the STM32 family. Other key parts include the 74AHCT1G125 and ILI9341. By type, the board carries 80 diodes, 42 switches, 7 capacitors, 5 connectors, 3 ICs and 3 resistors.

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

From the project

those specs refer to the tactile buttons version, but a led backlight button version is in the works too.

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

Main components on the OTTO-main

STM32F103RETx74AHCT1G125ILI9341

OTTO-main bill of materials (BOM)

142 components, 20 distinct parts.

QtyPartRefs
1
STM32F103RETx
U1
1
74AHCT1G125
U2
1
ILI9341
U3
1
8mhz
Y1
1
POWER_BOARD
J1
1
AUDIO_BOARD
J2
1
Raspberry_Pi_2_3
J3
1
MICROPHONE
J4
1
Conn_01x24
J5
38
SW_SPST
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +30
4
Rotary_Encoder_Switch
SW13, SW14, SW27, SW28
38
D_ALT
D1, D2, D3, D4, D5, D6, D7, D8 +30
4
1N4148
D13, D14, D27, D28
38
WS2812B
D43, D44, D45, D46, D47, D48, D49, D50 +30
1
30ohm
L1
4
1uf
C3, C4, C5, C6
1
10nf
C7
2
22pf
C8, C9
2
4.7K
R1, R2
1
3.9
R20

OTTO-main design files

The KiCad project lives in the cester-ino/OTTO-hardware 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 STM32F103RETx, from the STM32 family.

How big is the OTTO-main PCB?

The OTTO-main measures 247 × 81 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the OTTO-main?

142 components, from 20 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-hardware 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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