While working on FIDO2 Authenticator [/category/fido2/] device I came into an interesting problem - User Verification. At the moment it is implemented really simple - just a button connected to the IO0 port. However, anybody is able to push this button and therefore authenticate with the device. Then I came to the idea of adding some biometric authentication for the user.
It's quite some time since the last update about my awesome FIDO2 Authenticator project [/category/fido2/]. The project did not stop, no. The latest challenging point was the idea that I should not use the external biometric scanner with UART interface but make a built-in one. So, I have ordered a few more biometric scanner modules and, unfortunately, it took several weeks to deliver.
Recently I've started connecting FPC1020A Fingerprint scanners [/2019/12/03/fpc1020-fingerprint-scanner/] to ESP32 microcontroller and built a working test board for both modifications I have.
After some disruption on hardware design, I have returned to writing driver for the FPC1020 fingerprint scanner [/2019/12/03/fpc1020-fingerprint-scanner/]. It's sad, but as I don't have complete documentation the process takes a significant amount of time and a lot of effort. To speed up the evaluation I started to write relevant code using C++ and Arduino Framework.
About one year ago I have purchased a widely available fingerprint identification module with UART interface. You can find this module almost everywhere for quite a decent price. However, the information about how to use it with Arduino is not that easy to find. I am interested to use it with the URU Card [/2020/06/29/uru-card-arduino-fido2-authenticator/] device so I took some time to play with it.