2 layers216.9 × 86.8 mm
Sweepbling lp pcb
davidphilipbarr/Sweep
Sweep - a small promicro based keyboard inspired by the Ferris.
59 parts2.1k
2 layers69.3 × 80 mm
SAO display
eutectic6337/SAO-display2A modular system for displaying Shitty Add-Ons on a wall, with their lights a-blinkin'.
- Size
- 69.3 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 10
- Pads
- 129
- Tracks, vias
- 44, 7
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Mar 2025
- Updated
- 8 Aug 2025
Overview
SAO display is an open-source printed circuit board by eutectic6337, from the eutectic6337/SAO-display repository on GitHub. It is a 2-layer board of 69.3 × 80 mm with 59 parts on 10 nets, routed with 44 tracks and 7 vias.
Its parts include 42 capacitors, 7 connectors, 1 resistor and 1 diode. It belongs with the lEDs and displays boards of this library.
README
README.mdSAO-display
A modular system for displaying Shitty Add-Ons on a wall, with their lights a-blinkin'.
Points:
- hexagonal mocules, for arbitrary tiling
- magnetic pogo-pin connectors for power distribution
- a buck converter on each module to minimise power loss through pogo pins
- space for art
- 3D-printed surrounds
Some design history:
-
Originally all 6 pogo pin connectors had identical polarity ... until I powered up the first board, and connected it to the second. Magic smoke was released from the second board's buck converter, because it had been fed -12V rather than +12V.
-
So, the pogo pin connectors now alternate in polarity, so that when multiple boards are connected together, if all are oriented the same way, their +12V and 0V lines will only make electrical contact like with like.
-
But if a board was not correctly oriented we would still have a problem with reverse polarity connection.
Non-zener diode protects buck converter module from reverse-polarity supply.
Zener diode protects buck converter from over-voltage supply.
Resistor protects zener diode from reverse-polarity supply.
The previous iteration of this board did not include the resistor; if you have some of those, you should retro-fit a resistor in series with the zener diode, between the supply voltage line and ground. The value is not critical, but something around 800 Ohms will ensure the fault current through the zener stays relatively low, in the event of reversed power supply connection.
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | C_1206_3216Metric | Capacitor_SMD:C_1206_3216Metric | C1_1206, C1_1206, C1_1206, C1_1206, C1_1206, C1_1206, C11_1206, C11_1206, C11_1206, C11_1206, C11_1206, C11_1206 |
| 8 | 10uF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C11, C12, C13, C14, C15, C16, C21, C22 |
| 6 | C_0603_1608Metric | Capacitor_SMD:C_0603_1608Metric | C11_0603, C11_0603, C11_0603, C11_0603, C11_0603, C11_0603 |
| 6 | C_0805_2012Metric | Capacitor_SMD:C_0805_2012Metric | C11_0805, C11_0805, C11_0805, C11_0805, C11_0805, C11_0805 |
| 5 | 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C3, C4, C5, C6 |
| 3 | pads | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J4, J6 |
| 3 | pogo pins | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J3, J5 |
| 1 | 20V zener diode | Diode_SMD:D_SOD-123 | Z1 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C18 |
| 1 | 22uF | Capacitor_SMD:C_0603_1608Metric | C17 |
| 1 | 3.3V | extra:AliExpress 3256806041034057 | M1 |
| 1 | 3.3V | extra:AliExpress 3256806122258440 | M1 |
| 1 | 3.3V | extra:AliExpress 3256801443409123 Mini560 | M1 |
| 1 | 47uF | Capacitor_SMD:C_1206_3216Metric | C19 |
| 1 | 820 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | SAO v1.69bis badge | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | CON1 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm_NumberLabels | JP1 |
| 1 | TestPoint_THTPad_D4.0mm_Drill2.0mm | TestPoint:TestPoint_THTPad_D4.0mm_Drill2.0mm | pin |
| 1 | another 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | any SOD-123F diode | Diode_SMD:D_SOD-123F | D1 |
| 1 | other 47uF | Capacitor_SMD:C_1206_3216Metric | C20 |
The 57 most common of 59 parts.
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Questions
How big is the SAO display PCB?
It measures 69.3 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SAO display use?
59 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the SAO display KiCad files?
From the eutectic6337/SAO-display repository on GitHub, at the commit this page was made from: the board is PCB/SAO-display/SAO-display.kicad_pcb and its schematic PCB/SAO-display/SAO-display.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SAO display design in my own project?
Its repository states no licence, so its author keeps all rights: ask eutectic6337 before reusing the design.