experimenting with R503 capacitive fingerprint sensor.

This code is written to work with the R503 capacitive fingerprint sensor. A Raspberry Pi 3B+ was used for main development. Communication is acheived through a serial port. Make sure the UART_BAUD_RATE parameter in R503_fingerprint.h is corresponding to the actual sensor configuration (57600 is the default sensor setting).

Run a simple demo with sudo ./rundemo.sh.

To make a shared external library usable in Python run ./makesharedlib.sh.

The code works best with the PiGpio library. Install the latest version with ./updatepigpio.sh.

The full UART (/dev/ttyAMA0) is used for communication for best results. Add dtoverlay=disable-bt or miniuart-bt to /boot/config.txt to make it the primary UART. If Bluetooth is also disabled sudo systemctl disable hciuart may need to be run as well. Also see check_rpi_config.sh.

If using with PiGpio, the program must be run with root priviledges.

The code should also work on other non-Raspberry systems with linux, but proper function is not guaranteed.

Also make sure the UART_PORT_NAME parameter in R503_fingerprint.h is set to the correct serial port that will be used on the machine.