6 layers75 × 78.4 mm
Poe backplate
dotstartech/wall-panel
Wall mounted 4 inch touch display panel with CM4 inside
125 parts445
4 layers78 × 40 mm
Add on nfc
dotstartech/wall-panel445Wall mounted 4 inch touch display panel with CM4 inside
- Size
- 78 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 64
- Pads
- 179
- Tracks, vias
- 293, 94
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jan 2026
- Updated
- 24 Aug 2026
Overview
Add on nfc is an open-source printed circuit board by dotstartech, from the dotstartech/wall-panel repository on GitHub. It is a 4-layer board of 78 × 40 mm with 51 parts on 64 nets, routed with 293 tracks and 94 vias.
It is built around the PZ254-2-20-WS. Its parts include 27 capacitors, 12 resistors, 2 connectors, 2 inductors and 1 IC. It belongs with the computers and single-board computers and radio and wireless boards of this library.
Main components
1README
README.mdWall Panel
Wall Panel is a 4-inch wall-mounted touch display panel powered by Raspberry Pi Compute Module 4 (CM4). It features a 720x720 IPS multitouch display and can be used as a Home Assistant dashboard or any other embedded display application.
Display
We use this display, but touch variant. It is 4 lane MIPI with i2c touch controller.
- Display driver: ST7703
- Touch driver: FT6336U
Possible use cases
- Home Assistant Dashboard. Perfect for wall-mounted smart home control panels with full touch interaction and high-resolution display.
- Information Display. Show weather, calendar, news, or any other dynamic content in your home or office.
- Control Panel. Use as a centralized control interface for IoT devices, lighting, or home automation systems.
- Embedded Display. Build custom applications using the full power of Raspberry Pi OS or any Linux distribution on the CM4.
List of features
- 720x720 IPS Display with multitouch support
- Raspberry Pi Compute Module 4 as the main brain
- External RTC for accurate timekeeping
- USB-C for data and power
- USB-OTG support for device mode
- Action Button for user interaction
- WiFi connectivity
- 40-pin GPIO Header for Raspberry Pi compatibility
- SD Card slot for storage expansion
- Micro HDMI output for external displays
- EEPROM Flashing capability for firmware updates
- Backplane Connector for power and data from the wall and future PoE backplate support
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C3, C5, C7, C9, C11 |
| 5 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1, C4, C6, C8, C10 |
| 2 | 1.3K | Resistor_SMD:R_0402_1005Metric | R12, R13 |
| 2 | 100K | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 10K/NC | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | 150pF | Capacitor_SMD:C_0402_1005Metric | C21, C24 |
| 2 | 15pF | Capacitor_SMD:C_0402_1005Metric | C12, C13 |
| 2 | 160nH | Inductor_SMD:L_0603_1608Metric | L2, L3 |
| 2 | 1nF | Capacitor_SMD:C_0402_1005Metric | C25, C26 |
| 2 | 2.2K | Resistor_SMD:R_0402_1005Metric | R9, R11 |
| 2 | 270pF | Capacitor_SMD:C_0402_1005Metric | C19, C20 |
| 2 | 4.7K/NC | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | 56pF | Capacitor_SMD:C_0402_1005Metric | C27, C28 |
| 2 | 68pF | Capacitor_SMD:C_0402_1005Metric | C22, C23 |
| 2 | 82pF | Capacitor_SMD:C_0402_1005Metric | C16, C17 |
| 2 | NC | Capacitor_SMD:C_0402_1005Metric | C15, C18 |
| 1 | 0 | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 10K | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | Crystal_GND24 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | G*** | kibuzzard-6A7047E1 | kibuzzard-6A7047E1 |
| 1 | G*** | kibuzzard-6A72FB9B | kibuzzard-6A72FB9B |
| 1 | G*** | kibuzzard-6A7047FA | kibuzzard-6A7047FA |
| 1 | G*** | kibuzzard-6A70481C | kibuzzard-6A70481C |
| 1 | G*** | kibuzzard-6A70487D | kibuzzard-6A70487D |
| 1 | Mic Adafruit | Adafruit_SPH0645LM4H:SPH0645LM4H | J5 |
| 1 | NFC_ANT_70x25_N3 | brushknight:NFC_ANT_70x25_N3 | AE1 |
| 1 | PN7160A1HN_C100E | PN7160A1HN_C100E:QFN50P600X600X100-41N-D | U1 |
| 1 | PZ254-2-20-WS | PM254-2-20-WS:PM254-2-20-WS-8.5 | J10 |
Questions
How big is the Add on nfc PCB?
It measures 78 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Add on nfc use?
51 parts, built around the PZ254-2-20-WS. 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 Add on nfc KiCad files?
From the dotstartech/wall-panel repository on GitHub, at the commit this page was made from: the board is pcb/add-on-nfc/add-on-nfc.kicad_pcb and its schematic pcb/add-on-nfc/add-on-nfc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Add on nfc design in my own project?
Its repository states no licence, so its author keeps all rights: ask dotstartech before reusing the design.
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