HardLabs

Omamori

felixmark·Omamori·0.2/Hardware/PCB_0.2.1/Omamori.kicad_pcb

Omamori PCB layout, top view — open source AVR/Arduino board by felixmark

About the Omamori PCB

Omamori is an open source AVR/Arduino PCB design by felixmark, published on GitHub. It is a 2-layer board measuring 25 × 35 mm, with 34 components from 27 distinct parts.

Its main chip is the ATtiny85, from the AVR/Arduino family. Other key parts include the BQ25504, TPS61222DCK and TS-1233. By type, the board carries 4 ICs, 1 transistor, 1 connector and 1 diode.

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

From the project

Omamori is a solar-powered LED pendant for necklaces.

Program ATTiny 1626 via UPDI pins on the back of the PCB. Set the internal clock to 1MHz and use a low uploading BAUD to make sure the microcontroller can keep up.

A version History of the Omamori project.

Version 0.3.1 \ Version 0.3.0 \ Version 0.2.1 \ Version 0.2.0 \ Version 0.1.0

Omamori, from the project README
From the project README

Main components on the Omamori

BQ25504TPS61222DCKATtiny85TS-1233

Omamori bill of materials (BOM)

34 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
BQ25504
U1
1
TPS61222DCK
U2
1
ATtiny85
U3
1
TS-1233
U4
1
IRLML0030
Q1
1
Conn_01x04_Female
J1
3
10uF
C_Stor1, C_post_boost1, C_pre_boost1
1
0.1uF
C_filter1
1
4.7uF
C_hvr1
1
100nF
C_led1
1
0.01uF
C_ref1
1
640mF
C_super1
1
4.7uH
L_boost1
1
22uH
L_bst1
1
500
R_data1
1
5.6M
R_oc1
2
10M
R_oc1_2, R_pulldown1
2
4.3M
R_oc2, R_uv2
1
1.8M
R_oc3
1
8.2M
R_oc4
Show 7 more
QtyPartRefs
1
10M
R_oc5
3
3.3M
R_ok1, R_ok3, R_ov2
1
2.7M
R_ok2
1
6.2M
R_ov1
1
5.6M
R_uv1
2
KXOB25-05X3F
Sol_1, Sol_2
1
SK6812
D1

Omamori design files

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

Omamori: common questions

What microcontroller does the Omamori use?

The Omamori is built around the ATtiny85, from the AVR/Arduino family.

How big is the Omamori PCB?

The Omamori measures 25 × 35 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Omamori?

34 components, from 27 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 Omamori design files?

From the felixmark/Omamori repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Omamori design in my own project?

The repository has no license, so all rights stay with felixmark. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Omamori 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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