With a 20€ fingerprint sensor and an Arduino or an ESP, you can create your own biometric access control.
Banggood provided me with this sensor, so I can show you how this works.
Banggood
Fingerprint Recognition Module -- https://goo.gl/QLYiBi
Wholesale Arduino Compatible SCM -- https://goo.gl/JxgyVQ
Amazon
Fingerprint Sensor -- https://amzn.to/2QyB98O
Arduino Uno -- https://amzn.to/2RwAMc1
NodeMcu -- https://amzn.to/2AQu9KN
Project page
https://rohling-de.blogspot.com/2018/12/fingerprint-sensor-with-arduino-or-esp.html
