We built a biometric fingerprint-controlled lock prototype. A fingerprint scanner is used to capture and store the fingerprints of authorized users. When the scanner recognizes a user, a solenoid plunger disengages and opens the lock.Parts List:
The fingerprint scanner module is powered by an ARM Cortex M3 CPU, which controls the on-board optical sensor and fingerprint recognition. Fingerprints are stored and processed by the module, which supports a UART protocol for communicating with a host application. The solenoid is powered from Kinoma Create and controlled by a digital output pin.
- Download Kinoma Studio
- TTL serial fingerprint scanner
- 5V solenoid
- Solenoid controller protoboard
- Breadboard jumper wires
- Schottky-type protection diode
- 1 kilohm resistor
- General Purpose NPN transistor
The protoboard is connected to the solenoid and Kinoma Create back header pins. The fingerprint scanner is also connected to the back header UART TX and RX pins.
Both front pin headers are configured for +5V and pin 51 is configured as a digital output. The application programmatically configures the front pins and displays the Pins Settings dialog.
For more detail: Unlock a Door with your Fingerprint