HardLabs

Tomo

kwan3217·kicad·Tomo6/Tomo.kicad_pcb

Tomo PCB layout, top view — open source AVR/Arduino board by kwan3217
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About the Tomo PCB

Tomo is an open source AVR/Arduino PCB design by kwan3217, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 35.6 × 55.9 mm, with 57 components from 36 distinct parts.

Its main chip is the ATMEGA328P-AU, from the AVR/Arduino family. Other key parts include the FT232RL, ADuM3221, MPU9250, FGPMMOPA6H and HMC5883L. By type, the board carries 20 capacitors, 10 diodes, 9 resistors, 8 ICs, 5 connectors and 2 crystals.

From the project

KiCad versions of my circuits

Many of my boards have the Open Source Hardware logo on them. Using this logo requires having an open source license and publishing the source. In order to support this, I have the URL of this repository engraved onto the boards themselves.

I have made a release for the Wearable Pocketometer boards, and intend to make a release each time I have a board made.

All boards which have been released since September 2020 have enough information to construct a bill of materials. This is in the form of Digikey part numbers attached to each part in the KiCad .sch files.

Main components on the Tomo

FT232RLADuM3221ATMEGA328P-AUMPU9250FGPMMOPA6HHMC5883LBMP180L3G4200D

Tomo bill of materials (BOM)

57 components, 36 distinct parts.

QtyPartRefs
1
FT232RL
U001
1
ADuM3221
U301
1
ATMEGA328P-AU
U401
1
MPU9250
U501
1
FGPMMOPA6H
U601
1
HMC5883L
U701
1
BMP180
U801
1
L3G4200D
U901
1
uFL
X611
1
16MHz
Y407
1
USB_MICROB
J001
1
Raspberry_Pi_1
J101
1
CONN_01X02
J102
1
CONN_02X03
J301
1
CONN_01X04
J401
1
Coin_Cell
B604
1
SW_SPST
S429
1
MSS1P2
D001
1
BLUE
D022
4
RED
D023, D122, D432, D613
Show 16 more
QtyPartRefs
2
GREEN
D306, D401
1
YELLOW
D417
1
D_Schottky
D604
1
Ferrite
L601
12
100nF
C002, C404, C406, C418, C420, C508, C510, C513 +4
2
22pF
C407, C408
1
10uF
C603
1
220mF
C604
1
220nF
C708
1
4.7uF
C710
1
10nF
C913
1
470nF
C914
3
680
R022, R122, R413
4
10k
R117, R429, R604, R914
1
1.5k
R306
1
680
R613

Tomo design files

The KiCad project lives in the kwan3217/kicad repository on GitHub; these links point at the commit this page was built from.

Tomo: common questions

What microcontroller does the Tomo use?

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

How big is the Tomo PCB?

The Tomo measures 35.6 × 55.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Tomo?

57 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Tomo design files?

From the kwan3217/kicad repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Tomo design in my own project?

Yes, under the terms of its GPL-2.0 license, which kwan3217 chose for the repository.

Can I test firmware for the Tomo 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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