TomasD-git/Business-CardBasically a custom devboard inside a bussines card that has nfc and e-paper
Bussines card is an open-source printed circuit board by TomasD-git, from the TomasD-git/Business-Card repository on GitHub. It is a 2-layer board of 105.9 × 58.7 mm with 37 parts on 54 nets, routed with 432 tracks and 60 vias.
It is built around the AP2112K-3.3 and NT3H2111W0FHKH. Its parts include 13 capacitors, 10 resistors, 6 connectors, 3 ICs and 2 diodes. It belongs with the lEDs and displays and microcontroller boards boards and the STM32 boards of this library.
A custom dev board built inside a business card — NFC, e-paper display and 16 exposed GPIO pins.
The Business Card is a fully custom PCB designed. The microcontroller drives both the e-paper display and the NFC IC over SPI/I2C, while the 16 GPIO pins are broken out along one edge for easy prototyping.
On power-up, the firmware initialises the display and NFC tag, can be configured, the e-paper holds whatever was last written without needing a continuous refresh.
The schematic is split into four main blocks:
MCU: Core microcontroller, configuration of nfc and e-paper, GPIO pins
E-paper interface: Has 8 exposed pins to solder an E-paper onto the PCB
NFC: NFC IC with antenna matching network, presents as a standard NDEF tag
Power: Power regulation with decoupling
Designed in KiCad, manufactured as a standard 2-layer board with PCBA. Gerber files and BOM are in the repo if you want to order your own.
User interface
Change firmware so it could be configured with web or custom application.
Custom CAD
Some type of CAD to protect mcu.
Copyright (c) [2026] [TomasD-git]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nF | Capacitor_SMD:C_0402_1005Metric | C2, C4, C5, C7, C8, C13 |
| 3 | 10uf | Capacitor_SMD:C_0603_1608Metric | C6, C10, C11 |
| 3 | 1uf | Capacitor_SMD:C_0402_1005Metric | C1, C3, C9 |
| 2 | 10K | Resistor_SMD:R_0402_1005Metric | R5, R8 |
| 2 | 22 | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 4.7K | Resistor_SMD:R_0402_1005Metric | R6, R7 |
| 2 | 5.1K | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2, J3 |
| 2 | Conn_01x10_Socket | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J5, J6 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | BOOT0, NRST |
| 1 | 100nf | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 68 | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BLUE LED | LED_SMD:LED_0402_1005Metric | D2 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | GREEN LED | LED_SMD:LED_0402_1005Metric | D1 |
| 1 | L | PCB Coils:COIL_GENERATOR | L1 |
| 1 | NT3H2111W0FHKH | NT3H2111W0FHKH:QFN8P50_160X160X50L40X20N | U1 |
| 1 | STM32F072C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J7 |
It measures 105.9 × 58.7 mm and has 2 copper layers, 1.6 mm thick.
37 parts, built around the AP2112K-3.3 and NT3H2111W0FHKH. 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.
From the TomasD-git/Business-Card repository on GitHub, at the commit this page was made from: the board is bussines card/bussines card.kicad_pcb and its schematic bussines card/bussines card.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask TomasD-git before reusing the design.
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