HardLabs

Just Split

semicontinuity·embedded·target/just-split/hardware/just-split.kicad_pcb

Just Split PCB layout, top view — open source AVR/Arduino board by semicontinuity

About the Just Split PCB

Just Split is an open source AVR/Arduino PCB design by semicontinuity, published on GitHub. It is a 2-layer board measuring 128.2 × 112.4 mm, with 127 components from 17 distinct parts.

Its main chip is the ATmega88-20PU, from the AVR/Arduino family. By type, the board carries 39 diodes, 28 resistors, 19 switches, 19 inductors, 8 jumpers and 4 transistors.

It belongs with the robotics & motion and sensors designs in this gallery.

From the project

Embedded projects

Embedded projects. ================================================================================

Projects for AVR microcontrollers. -------------------------------------------------------------------------------- - Primitive alarm - Primitive terminal - Voltage relay - Mood lamp - firmware under development - Primitive motion sensor controller, that works in pair with primitive alarm - Servo controller - unfinished, no firmware yet - LED dimmer, controlled via CAN bus - CAN bus router - firmware under development - Roller shutter controller, controlled via CAN bus - Humidity meter

Main components on the Just Split

ATmega88-20PU

Just Split bill of materials (BOM)

127 components, 17 distinct parts.

QtyPartRefs
2
ATmega88-20PU
U1, U2
4
MMBT3904
Q1, Q2, Q3, Q4
2
MJ-4PP-9
J1, J3
1
OLED
J2
8
—
JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9
1
RESET
RSW2
19
SW_PUSH
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +11
19
D
D1, D2, D3, D4, D5, D6, D7, D8 +11
16
LED_Dual_CAC
D13, D21, D22, D23, D24, D25, D26, D27 +8
4
LED
D36, D37, D38, D39
19
SK6812MINI
L1, L2, L3, L4, L5, L6, L7, L8 +11
4
0.1
C1, C2, C4, C5
12
330
R1, R2, R3, R4, R5, R6, R7, R8 +4
3
10k
R13, R14, R15
4
R
R16, R17, R23, R24
5
10k
R18, R19, R20, R21, R22
4
10k
R25, R26, R27, R28

Just Split design files

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

Just Split: common questions

What microcontroller does the Just Split use?

The Just Split is built around the ATmega88-20PU, from the AVR/Arduino family.

How big is the Just Split PCB?

The Just Split measures 128.2 × 112.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Just Split?

127 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Just Split design files?

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

Can I use the Just Split design in my own project?

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

Can I test firmware for the Just Split 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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