Pico-Computer-Login

Unlocking your Computer using a Raspberry Pi Pico and RFID reader 😄. This is written in micropython and allows you to type your passwords using an RFID tag. It uses a third-party hid library compiled into the firmware-blank.uf2 file. I have also used third party libraries for the RFID reader and I2c LCD display. And use the firmware above to create this project. There is a github issue for the usb hid support usb hid support for micropython. And this forum which helped me alot to create this project here. I got the Libraries from these links: LCD and RFID. If you want to modify this code to type in your password go to this link and check the keykode code by scrolling down to the keyboard group. First run the mfrc522_read.py to read and know your rfid tags uid and then change it in the main.py. To change the uid in main.py on line 34 if card == 3050636775: # change this with the uid of your tag change the uid. And to make a key board press these lines are used:

report[3] = 0x04 # register 'a' keycode
usb_hid.report(usb_hid.KEYBOARD, report) # send event
time.sleep(0.1)
report[3] = 0x00 # unregister 'a' keycode
usb_hid.report(usb_hid.KEYBOARD, report) # send event

In the first two lines it is simulating the key press of the letter 'a' then a delay of 0.1 seconds (100 miliseconds) then in the last two lines the key is released. To change the keycode just change the value of report[3] = 0x04 with something else in the above code.

Circuit

The connections are:

1. RC522 ---------------------------PICO
3. SDA/CS---------------------------GP17
4. SCK------------------------------GP18
5. MISO-----------------------------GP16
6. MOSI-----------------------------GP19
7. RST------------------------------GP0
8. GND------------------------------GND
9. VCC------------------------------3.3V
11. LCD------------------------------PICO
13. SDA------------------------------GP20
14. SCK------------------------------GP21
15. GND------------------------------GND
16. VCC------------------------------VBUS

Installation

1. After making the circuit, plug in you RPI pico into your computer while pressing the boot key.
2. When your computer recognises it as an external drive copy thefirmware-blank.uf2 onto your RPI pico which has a library for usb hid support
3. Save the code on the RPI pico using the thonny ide

Images