Links for sensor:

Amazon Sensor. The only problem with this sensor is it has more wires than the sensor in the instructable link.

Senor from Instructables. The problem with this one is that it costs more and isn't from Amazon.

Instructable link that we found with a DIY fingerprint sensor. It shows us how to wire the sensor and connect it to arduino.

Today we have decided to switch our idea to a fingerprint security system for schools. We will sell our system to the wealthier schools, and with some of our profit, we will give away security systems to schools that need it, but can't afford it.