2 layers177 × 106 mm
2 layers90 × 94 mm
Braille Evaluation Board
DeflateAwning/Framework-Braille-DisplayA braille display for the Framework 13 laptop's touchpad, hopefully
- Size
- 90 × 94 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 98
- Nets
- 151
- Pads
- 584
- Tracks, vias
- 2,117, 392
- Pours
- 1,189
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 Aug 2024
- Updated
- 20 Sep 2024
Overview
Braille Evaluation Board is an open-source printed circuit board by DeflateAwning, from the DeflateAwning/Framework-Braille-Display repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 90 × 94 mm with 98 parts on 151 nets, routed with 2,117 tracks and 392 vias.
It is built around the 74HC238D, TBD62083APG and TBD62783APG, with the RP2040-ZERO and BAV99 among its other parts. Its parts include 58 diodes, 10 capacitors, 10 ICs, 8 inductors and 4 connectors. It belongs with the RP2040 boards of this library.
Main components
5
74HC238D
SOP-16SOP-16 Signal Switches, Multiplexers, Decoders ROHSMDDSignal Switches, Multiplexers, Decoders
TBD62083APG
DIP-18-40℃~+85℃ 0.1mA 1uA 1uA 2V 30V 500mA 50V 8 DIP-18 Darlington Transistor Arrays ROHSToshibaDarlington Transistor ArraysTBD62783APG
DIP-18-40℃~+85℃ 0.1mA 1uA 1uA 2V 30V 8 DIP-18 Darlington Transistor Arrays ROHSToshibaPower Distribution Switches
RP2040-ZERO
-- Development Boards & Kits ROHSWaveshareDevelopment Boards & Kits
BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
README
README.mdFramework-Braille-Display
A braille display for the Framework 13 laptop's touchpad, hopefully
Project Status
⚠️ This project is still a work in progress. It is not usable, yet. ⚠️
If you are interested in helping design, test, or advise on this project, please reach out!
I'm not sure how long this project will take. The goal is to have a proof of concept by 2025-06-01.
What is this?
This is a project to create a refreshable braille display, which is installable in the location of the Framework 13 laptop's touchpad.
A braille display is a device that allows blind and visually impaired people to read text on a computer screen by converting it to braille.
Manufacturing techniques, cost, etc. TBD.
Why?
I am not blind. I am, however, disappointed in the lack of laptop-compatible braille displays, and the lack of affordable braille displays in general. I believe that an addition to the open source Framework laptop is a great way to make computers more accessible to visually impaired people from all countries.
Braille Standards
- ISO 17049:2013 (Accessible design — Application of braille on signage, equipment and appliances)
| Parameter | Min (mm) | Max (mm) | Nominal for Embossing (mm) |
|---|---|---|---|
| Dot Base Diameter | 1.5 | 1.6 | 1.44 |
| Dot height | 0.6 | 0.9 | 0.48 |
| Dist. between two dots in the same cell | 2.3 | 2.5 | 2.34 |
| Dist. between corresponding dots in cells (char-to-char) | 6.1 | 7.6 | 6.20 |
| Dist. between corresponding dots in cells (row-to-row) | 10.0 | 10.2 | 10.00 |
Framework Laptop
- CAD and electrical specs for the Framework 13 laptop: https://github.com/FrameworkComputer/Framework-Laptop-13
Parts
98| Qty | Value | Footprint | References |
|---|---|---|---|
| 56 | BAV99 | Braille_Display_Footprint_Lib:SOT-23_Handsoldering_EasyMode | D401, D402, D1001, D1002, D1003, D1004, D1005, D1006, D1007, D1101, D1102, D1103, D1104, D1105, D1106, D1107 +40 |
| 8 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C201, C202, C203, C204, C301, C302, C303, C304 |
| 8 | ~ | Braille_Display_Footprint_Lib:Solenoid_Braille_Cell | L401, L501, L601, L701, L801, L901, L1001, L1101 |
| 4 | 74HC238 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U201, U202, U301, U302 |
| 2 | 1u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C101, C102 |
| 2 | 3k3 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R102, R103 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J101, J103 |
| 2 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D101, D102 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW101, SW102 |
| 2 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J102, J104 |
| 2 | TBD62083A | Package_SO:SOIC-18W_7.5x11.6mm_P1.27mm | U204, U304 |
| 2 | TBD62783A | Package_SO:SOIC-18W_7.5x11.6mm_P1.27mm | U203, U303 |
| 1 | 240 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R101 |
| 1 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP102 |
| 1 | Jumper_3_Bridged12 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP101 |
| 1 | LM317_SOT-223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U101 |
| 1 | RP2040-Zero | Braille_Display_Footprint_Lib:RP2040 Zero | U102 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV101 |
Questions
How big is the Braille Evaluation Board PCB?
It measures 90 × 94 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Braille Evaluation Board use?
98 parts, built around the 74HC238D, TBD62083APG, TBD62783APG and RP2040-ZERO. 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 Braille Evaluation Board KiCad files?
From the DeflateAwning/Framework-Braille-Display repository on GitHub, at the commit this page was made from: the board is Braille Evaluation Board/Braille Evaluation Board.kicad_pcb and its schematic Braille Evaluation Board/Braille Evaluation Board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Braille Evaluation Board design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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