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Attiny85 charlie circle

rsedak·attiny85_charlie_circle·design_files/attiny85_charlie_circle.kicad_pcb

Attiny85 charlie circle PCB layout, top view — open source AVR/Arduino board by rsedak

About the Attiny85 charlie circle PCB

Attiny85 charlie circle is an open source AVR/Arduino PCB design by rsedak, published on GitHub under the Custom license license. It is a 2-layer board measuring 70 × 70 mm, with 22 components from 8 distinct parts.

Its main chip is the ATtiny85, from the AVR/Arduino family. By type, the board carries 12 diodes, 4 resistors, 2 switches, 1 IC, 1 battery holder and 1 buzzer.

From the project

Purpose of Charlie circle module is student education. It shows advantages of charlieplexing. It is published under Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license. I hope you will enjoy it.

Purpose of Charlie circle module is student education. It shows advantages of charlieplexing.

Contributor ------------ - Robert Sedak — features, programming, schematic design, CAD design.

Application ----------- Robert Sedak made a video with example programmed in Arduino IDE with ATtiny85 support:

You can download example for Arduino IDE from here.

Bill Of Materials ----------------- - 1 ea., PCB - 4 ea., 470R ohm 1/4W 1% Resistor (R1, R2, R3, R4) - 12 ea., LED 3mm (D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12) - 4 ea., 6x6x4.3mm SPST Momentary push switch (SW1) - 1 ea., SDPT 1P2T…

Attiny85 charlie circle, from the project README
From the project README

Main components on the Attiny85 charlie circle

ATtiny85

Attiny85 charlie circle bill of materials (BOM)

22 components, 8 distinct parts.

QtyPartRefs
1
ATtiny85
U1
1
Battery_Cell
BT1
1
Piezzo buzzer
BZ1
1
SW_Push
SW1
1
SW_Push_SPDT
SW2
12
LED
D1, D2, D3, D4, D5, D6, D7, D8 +4
1
0.1uF
C1
4
470R
R1, R2, R3, R4

Attiny85 charlie circle design files

The KiCad project lives in the rsedak/attiny85_charlie_circle repository on GitHub; these links point at the commit this page was built from.

Attiny85 charlie circle: common questions

What microcontroller does the Attiny85 charlie circle use?

The Attiny85 charlie circle is built around the ATtiny85, from the AVR/Arduino family.

How big is the Attiny85 charlie circle PCB?

The Attiny85 charlie circle measures 70 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Attiny85 charlie circle?

22 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the Attiny85 charlie circle design files?

From the rsedak/attiny85_charlie_circle repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Attiny85 charlie circle design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Attiny85 charlie circle 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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