PCB Business Card-bom.csv

PCB-Business-Card

A PCB Business card that shows your Spotify activity using lanyard in real time. Tap the card with a phone to show what song is playing on Spotify.

Powered over USB-C from a phone or any power bank. Connects to a phone hotspot (or any wifi) for the Lanyard WebSocket.

Screenshots

Why I built this

I wanted a business card that has a cool twist. Plain cards feel boring to show and they are all the same. This one shows what I'm listening to, lets someone tap it to hear the same song, and has my GitHub a QR scan away. Business cards are supposed to grab people's attention, and I would say this one is different than other business cards.

Hardware

The ESP32 rewrites the NDEF URL every time a track changes over I2C, NT3H2111 (NFC Module) has I2C and RF interface simultaneously. When you are playing something NFC goes to spotify when nothing is playing goes to GitHub (for now). 100x75mm PCB. USB-C powers it with any power bank (im personally planning to use my phone). ESP32 is going to be hand soldered to save money but everything else is JLCPCB assembly

Wiring

Signal	GPIO
DISP_MOSI	IO11
DISP_SCLK	IO12
DISP_CS	IO10
DISP_DC	IO13
DISP_RST	IO14
DISP_BLK	IO9
NFC_SDA	IO5
NFC_SCL	IO6
NFC_FD	IO4
USB_DN	IO19
USB_DP	IO20
BOOT	IO0
RESET	EN

Firmware

firmware/main.ino

Libraries needed: TFT_eSPI, TJpg_Decoder, ArduinoWebsockets, ArduinoJson. Board: ESP32S3 Dev Module.

Bill of Materials

SMD parts assembled by JLCPCB. ESP32 and the display are sourced separately.

Component	Qty	LCSC	Note
100nF 0402 cap	3	C1525	Basic
10µF 0805 cap	2	C15850	Basic
56pF 0402 cap	1	C107007	Extended — antenna tuning
5.1kΩ 0402 resistor	2	C25905	Basic — USB-C CC
10kΩ 0402 resistor	3	C25744	Basic — pullups
4.7kΩ 0402 resistor	2	C25900	Basic — I2C pullups
AMS1117-3.3 SOT-223	1	C6186	Basic
NT3H2111W0FHKH XQFN-8	1	C710403	Extended — NFC
TYPE-C 16PIN 2MD	1	C2765186	Extended — USB-C
Tactile switch SMD	2	—	Extended
Name,Purpose,Quantity,Total Cost (USD),Link,Distributor
"Display","Displaying",1,14.00,"https://www.amazon.com/gp/product/B0GL1SWYP4/ref=ox_sc_act_title_1?smid=A2Z10KY0342329&psc=1","Amazon"
"ESP32-S3-WROOM-1-N4","microcontroller",1,5.21,"https://www.digikey.com/en/products/detail/espressif-systems/ESP32-S3-WROOM-1-N4/16162639","DIGIKEY"
"JLCPCB","PCB",1,25.59,"","JLCPCB"
Component	Qty	Source
-----------	-----	--------
ESP32-S3-WROOM-1-N8	1	Mouser Electronics
2.0" ST7789V IPS 240×320	1	Amazon

Repository Structure

PCB-Business-Card/
├── Firmware/
│   └── main.ino
├── lanyardpcbcard-backups/
├── libs/
│   └── easyeda/
│       ├── easyeda.3dshapes/
│       ├── easyeda.pretty/
│       └── easyeda.kicad_sym
├── production/
│   ├── backups/
│   ├── CPL-lanyardpcbcard.csv
│   ├── bom.csv
│   ├── lanyardpcbcard.step
│   ├── lanyardpcbcard.zip
│   └── ...
├── LICENSE
├── README.md
├── lanyardpcbcard.kicad_pcb
├── lanyardpcbcard.kicad_pro
├── lanyardpcbcard.kicad_sch
└── lanyardpcbcard.kicad_prl

License

MIT