RP2040 CircuitPy RFID PC Unlock

This allows you to unlock your computer with an NFC or RFID tag. Programmed using Circuit Python on a RP2040 Zero board from AliExpress, it conencts to a RC522 RFID Reader. This uses the Adafruit_hid.keyboard Circuit Python library to input the password as text to the computer.

Copy the CircuitPython_Device folder to your RP2040 Zero. All needed libaries are included there. Boot.Py prevents your RP2040 Zero from showing up as a USB Flash Drive in File Explorer.

Parts:

• RP2040 Zero
  • https://www.aliexpress.us/item/3256805271899344.html?spm=a2g0o.order_list.order_list_main.39.6fe01802m0HRTG&gatewayAdapt=glo2usa
• RC522 RFID Reader
  • https://www.aliexpress.us/item/3256805162087677.html?spm=a2g0o.order_list.order_list_main.67.6fe01802m0HRTG&gatewayAdapt=glo2usa
• Computer with Thonny
  • Get Started with MicroPython on Raspberry Pi Pico is a good guide to start with
    • https://magpi.raspberrypi.com/books/micropython-pico
• Piezo Buzzer
• 10k Ohm Resistor (optional to limit volume of buzzer)
• Common Cathode RGB LED (definently can be switches to Common Anthode LED) - Optional, not pictured
• 3x 200 Ohm Resistors for RGB LED

Steps to set up:

1. Connect RC522 RFID Reader to your RP2040 Zero.
2. Download CircuitPython_Device and open Code.Py in Thonny. Copy lib folder to Circuit Python device with Thonny (see Get Started with MicroPython on Raspberry Pi Pico)
3. Run the Code
4. Scan your RFID/NFC cards/fobs
5. Copy the card/fob ID into line 27
6. Insert your password or passcode into line 68
7. Save code.py to RP2040 Zero

Schematic

Finished Project