HardLabs

Itsy-Bitsy

0101shift·Itsy-Bitsy

Itsy-Bitsy PCB layout, top view — open source AVR/Arduino board by 0101shift

About the Itsy-Bitsy PCB

Itsy-Bitsy is an open source AVR/Arduino PCB design by 0101shift, published on GitHub. It is a 2-layer board measuring 28 × 28 mm, with 42 components from 16 distinct parts.

Its main chip is the ATtiny85-20SU, from the AVR/Arduino family. Other key parts include the AP2112K-3.3TRG1 and TLV7031DBVR. By type, the board carries 14 diodes, 14 resistors, 6 transistors, 4 capacitors, 3 ICs and 1 battery holder.

From the project

A small LED pixel dot, which gets activated through an external IR interrupt.

NOTE: DO NOT MOUNT U2 (comparator) while flashing the controller as it is used for ICSP programming.

Itsy-Bitsy, from the project README
From the project README

Main components on the Itsy-Bitsy

AP2112K-3.3TRG1TLV7031DBVRATtiny85-20SU

Itsy-Bitsy bill of materials (BOM)

42 components, 16 distinct parts.

QtyPartRefs
1
AP2112K-3.3TRG1
U1
1
TLV7031DBVR
U2
1
ATtiny85-20SU
U3
2
BC847
Q1, Q2
4
PT12-21C_TR8
Q3, Q4, Q5, Q6
1
BC-2003
BT1
1
AA3528LSECKT/J3
D1
4
SFH_4045N
D2, D3, D4, D5
8
green
D6, D7, D8, D9, D11, D12, D13, D14
1
ZLLS410TA
D10
2
1uf
C1, C2
1
4.7uf
C3
1
0.1uf
C4
10
R
R1, R2, R6, R7, R8, R9, R12, R13 +2
3
10k
R3, R5, R10
1
TC33X-2-103E
R4

Itsy-Bitsy design files

The KiCad project lives in the 0101shift/Itsy-Bitsy repository on GitHub; these links point at the commit this page was built from.

Itsy-Bitsy: common questions

What microcontroller does the Itsy-Bitsy use?

The Itsy-Bitsy is built around the ATtiny85-20SU, from the AVR/Arduino family.

How big is the Itsy-Bitsy PCB?

The Itsy-Bitsy measures 28 × 28 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Itsy-Bitsy?

42 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Itsy-Bitsy design files?

From the 0101shift/Itsy-Bitsy repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Itsy-Bitsy design in my own project?

The repository has no license, so all rights stay with 0101shift. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Itsy-Bitsy 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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