A popular 13.56 MHz RFID card reader with strong MicroPython support, wired to a Pico.

Key part: RC522 RFID reader module (kit photo still needed)
| Part (price) | Role |
| Raspberry Pi Pico ($4) | Microcontroller |
| RC522 RFID Reader | Sensor |
| 830-Point Breadboard ($1.10) | Breadboard |
| Micro-USB Data Cable ($2.50) | Power and programming cable |
Microcontroller listed first. Prices shown only where known; see the source book for quantities, wiring, and current prices.