2 layers60 × 40 mm
2 layers36 × 38.3 mm
1.28inch round
zzeneg/vik-display-adapter7Small adapter for bare LCD displays to VIK connector.
- Size
- 36 × 38.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 20
- Pads
- 60
- Tracks, vias
- 106, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 14 Jan 2024
- Updated
- 29 Feb 2024
Overview
1.28inch round is an open-source printed circuit board by zzeneg, from the zzeneg/vik-display-adapter repository on GitHub, published under the MIT licence. It is a 2-layer board of 36 × 38.3 mm with 17 parts on 20 nets, routed with 106 tracks and 10 vias.
It is built around the S8050. Its parts include 3 connectors, 2 capacitors, 2 resistors and 1 transistor.
Main components
1README
README.mdVIK Bare Display adapter
Small adapter for bare LCD displays to VIK connector.
Features
- horizontal or vertical VIK connector (FPC)
- automatic reset (no separate pin)
- two mounting holes for solder nuts
- testing pads
Supported displays
Theoretically any display with 12pin welding type FPC with this pin out:
- GND
- LEDK
- LEDA
- VDD
- GND
- GND
- DC
- CS
- SCL
- SDA
- RESET
- GNDBare displays can be used with any PCB size, but they are pretty fragile without any support, so be careful.
Existing PCBs for specific sizes:
- 1.28" round display (example)
- universal 0.7mm pitch / 1.47" rectangular display (example)
- universal 0.8mm pitch (example)
Forced backlight
If controlled backlight is not needed (for example no GPIO2 on VIK), GND testing pad can be bridged to R1 bottom pad, for 100% backlight. In that case S8050 and R1 parts are not needed.
Photos
BOM
All SMD components are 1206 size
- 10R resistor
- 100k resistor
- 1uF capacitor
- 100nF capacitor
- S8050 transistor
- 12pin FFC connector vertical/horizontal (both can be soldered in the same time)
VIK module certification
| Category | Classification | Response |
|---|---|---|
| FPC connector | Required | :heavy_check_mark: |
| Breakout pins | Recommended | :x: |
| Uses: SPI | Optional | :heavy_check_mark: |
| SPI used for SPI only | Strongly recommended | :heavy_check_mark: |
| Uses: I2C | Optional | :x: |
| I2C used for I2C only | Strongly Recommended | N/A |
| I2C pull ups | Required | N/A |
| Uses: RGB | Optional | :x: |
| Uses: Extra GPIO 1 | Optional | :heavy_check_mark: |
| Uses: Extra GPIO 2 | Optional | :heavy_check_mark: |
| Standard PCB Size/Mount | Strongly recommended | :x: |
Used projects and resources
- https://www.waveshare.net/w/upload/f/f5/1.47inch_LCD_Module_SchDoc.pdf
- https://hackaday.io/project/168130-universal-ips-display-breakout-board
- 1.47" LCD model https://grabcad.com/library/1-47-rgb-tft-lcd-screen-display-module-172-320-ips-screen-st7789-driver-8pin-1
- 1.28" round LCD model https://grabcad.com/library/1-28-lcd-ga9a01-1
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | MountingHole | zzkeeb:Hole_M2-solder-nut-2.5 | H1, H2 |
| 1 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2 |
| 1 | 10R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 1 | 1u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 3.3V | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | BL | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | CS | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | Conn_01x12_Pin | zzkeeb:Connector_Display-12pin-0.7mm | J3 |
| 1 | DC | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | MOSI | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | S8050 | zzkeeb:Transistor-S8050-SOT-23 | Q1 |
| 1 | SCLK | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | vik-module-connector | zzkeeb:Connector_VIK-vertical-module | J2 |
| 1 | vik-module-connector | vik:vik-module-connector-horizontal | J1 |
Questions
How big is the 1.28inch round PCB?
It measures 36 × 38.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 1.28inch round use?
17 parts, built around the S8050. 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 1.28inch round KiCad files?
From the zzeneg/vik-display-adapter repository on GitHub, at the commit this page was made from: the board is pcb/1.28inch-round/pcb.kicad_pcb and its schematic pcb/1.28inch-round/pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 1.28inch round design in my own project?
Its repository publishes it under the MIT 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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