Here’s my new and improved design.
Here’s my original design from two years ago.
DIY
Fingerprint
Scanning
Lock
Add some
real biometric
security
to your doors
and drawers
This is my Arduino Fingerprint Door Lock using
an optical fingerprint identification sensor from
Adafruit. Whether I decide to secure my room or
limit access to my tools, this project can easily fit
onto doors, cupboards, and drawers.
I first built this door lock two years ago. For this
redesign, my goal was to see how my engineering
skills have changed over the past two years. I've
successfully miniaturized it, but I'm still using two
power sources. Maybe you can improve it!
1. SOLDER THE ARDUINO NANO
TO A BLANK PCB
Be sure to leave enough space for the mini USB
cable (Figure
A
).
JEFFREY ELIAS is a 17-year-old maker and electronics
hobbyist who plans to pursue electrical engineering.
TIME REQUIRED:
2–3 Hours
DIFFICULTY:
Easy/Intermediate
COST:
$80–$90
MATERIALS
» Optical fingerprint sensor module
ZhianTec ZFM-20, Adafruit #751
» Solenoid lock, 12V DC, less than 1A
» Arduino Nano microcontroller board
» Blank PCB aka proto board
» Relay module, 5V
» Hookup wire, 22–24 AWG
» Heat-shrink tubing for 22–24 AWG
» Battery, 9V
» Battery connector, 9V
» Power supply, AC/DC 12V 1.5A–2A,
with male barrel connector
» Matching female barrel connector
Get both with Amazon B07HNL5D56 or similar.
» Micro slide switch, on-off
TOOLS
» Soldering iron with solder
» Wire cutters/strippers
» Screwdrivers
» Heat gun or lighter for heat-shrink
» USB Mini-B cable for programming the Nano
» Hot glue (optional)
» 3D printer (optional) for an enclosure
105
make.co
A
M82_104-107_FingerprintLock_F1.indd 105M82_104-107_FingerprintLock_F1.indd 105 7/12/22 11:40 AM7/12/22 11:40 AM
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