2 layers90.2 × 90 mm
Sra dev board 2026
SRA-VJTI/sra-board-hardware-design
ESP32-based Development Board for Robotics and Embedded Applications
219 parts81MIT
2 layers111.6 × 68.8 mm
OpenFlipdisc
shashwtd/Open-FlipDisk3an open source 5x5 flip-dot display module built around custom electromagnetic flip discs, a Raspberry Pi Pico 2 W, and a custom driver PCB.
- Size
- 111.6 × 68.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 52
- Nets
- 98
- Pads
- 313
- Tracks, vias
- 849, 56
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 14 Jun 2026
- Updated
- 22 Oct 2026
Overview
OpenFlipdisc is an open-source printed circuit board by shashwtd, from the shashwtd/Open-FlipDisk repository on GitHub. It is a 2-layer board of 111.6 × 68.8 mm with 52 parts on 98 nets, routed with 849 tracks and 56 vias.
It is built around the 74HC595, SS14 and SS34. Its parts include 20 capacitors, 9 ICs, 4 diodes, 4 connectors and 4 switches. It belongs with the RP2040 boards of this library.
Main components
3
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky DiodesSS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdOpen-FlipDisc
an open source 5x5 flip-dot display module built around custom electromagnetic flip discs, a Raspberry Pi Pico 2 W, and a custom driver PCB.
I started this because small flip-dot modules are hard to find, and the polished commercial options from companies like AlfaZeta are too expensive for this project. this repository has all the work ive done on this project in my attempt to make my own flip dot display.. it also contains a PCB which can be used to drive the flipdots individually
current design
- 5x5 flip-dot matrix, 25 individually controlled dots
- Raspberry Pi Pico 2 W controller
- TB6612FNG motor drivers for coil driving
- 74HC595 shift registers for expanding control lines
- 12V input with onboard 5V regulation
- JLCPCB SMD assembly for the SMD parts
- Through-hole parts, Pico, regulator, connectors, and mechanical hardware installed manually
here's how the PCB looks:
some CAD renders for module, made in fusion:
this is my first rough 3D printed draft 3x3 grid:
the bill of materials for this project can be found here
Parts
52| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 |
| 5 | TB6612FNG | Package_SO:SSOP-24_5.3x8.2mm_P0.65mm | U5, U6, U7, U8, U9 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 74HC595 | Package_DIP:DIP-16_W7.62mm_Socket | U2, U3, U4 |
| 2 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C2, C3 |
| 2 | 22uF | Capacitor_SMD:C_1206_3216Metric | C5, C19 |
| 2 | 330R | Resistor_SMD:R_0805_2012Metric | R2, R3 |
| 2 | Screw_Terminal_01x05 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-5-5.08_1x05_P5.08mm_Horizontal | J2, J3 |
| 1 | 1000uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C1 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C20 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric | C4 |
| 1 | 4.7uH | Inductor_SMD:L_Sunlord_SWPA5040S | L1 |
| 1 | AP63205WU-7 | OpenFlipdisc_EasyEDA:TSOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | U1 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | CLEAR | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | D_ACT (red) | LED_THT:LED_D5.0mm | D4 |
| 1 | D_PWR (green) | LED_THT:LED_D5.0mm | D3 |
| 1 | FUNC1 | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | FUNC2 | Button_Switch_THT:SW_PUSH_6mm | SW3 |
| 1 | Fuse T2A | Fuse:Fuse_2920_7451Metric | F1 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm | SW4 |
| 1 | RaspberryPi_Pico_W | Module:RaspberryPi_Pico_Common_THT | A1 |
| 1 | SS14 | Diode_SMD:D_SMA | D2 |
| 1 | SS34 | Diode_SMD:D_SMC | D1 |
The 51 most common of 52 parts.
Questions
How big is the OpenFlipdisc PCB?
It measures 111.6 × 68.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OpenFlipdisc use?
52 parts, built around the 74HC595, SS14 and SS34. 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 OpenFlipdisc KiCad files?
From the shashwtd/Open-FlipDisk repository on GitHub, at the commit this page was made from: the board is PCB/OpenFlipdisc.kicad_pcb and its schematic PCB/OpenFlipdisc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenFlipdisc design in my own project?
Its repository states no licence, so its author keeps all rights: ask shashwtd before reusing the design.
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