SparkFun Forums 

Where electronics enthusiasts find answers.

General project discussion / help
Did you make a robotic coffee pot which implements HTCPCP and decafs unauthorized users? Show it off here!
I am using Fingerprint scanner GT-511C3 with Adafruit feather for my project. Everything works perfectly but I found registered fingers are removed suddenly after giving some one. They have no access to code level but only a product I made. How could this happen? Any possible scenario and solution to prevent this issue later?