.. zephyr:code-sample:: grow_r502a
:name: GROW R502-A Fingerprint Sensor
:relevant-api: sensor_interface
Store and match fingerprints using the GROW R502-A fingerprint sensor.
Overview
********
This sample has the below functionalities:
#. Sensor LED is controlled using led APIs from zephyr subsystem.
#. Shows the number of fingerprints stored in the sensor.
#. Shows the sensor device's configurations like baud rate, library size, address and data packet size in UART frame.
#. When SENSOR_ATTR_RECORD_FREE_IDX is set then it search for free index in sensor library.
#. When SENSOR_ATTR_RECORD_ADD is set then it adds a new fingerprint to the sensor.
#. When SENSOR_ATTR_RECORD_FIND is set then it tries to find a match for the input fingerprint. On finding a match it returns ID and confidence.
#. When SENSOR_ATTR_RECORD_DEL is set then it deletes a fingerprint from the sensor.
Note: Fingerprint add functionality work only when SENSOR_TRIG_TOUCH is set.
Wiring
*******
This sample uses an external breakout for the sensor. A devicetree
overlay must be provided to identify the UART bus and the GPIO
used to control the sensor. Sensor can be powered using mentioned optional GPIO.
References
**********
For more information about the GROW_R502A Fingerprint Sensor see
http://en.hzgrow.com/product/143.html
Building and Running
********************
After providing a devicetree overlay that specifies the sensor location,
build this sample app using:
.. zephyr-app-commands::
:zephyr-app: samples/sensor/grow_r502a
:board: esp32_devkitc_wroom/esp32/procpu
:goals: build flash
Sample Output
*************
.. code-block:: console
*** Booting Zephyr OS build v3.6.0-3147-g8ae1a2e2718e ***
template count : 4
baud 57600
addr 0xffffffff
lib_size 200
data_pkt_size 128
Fingerprint Deleted at ID #3
Fingerprint template free idx at ID #3
Waiting for valid finger to enroll as ID #3
Place your finger
Fingerprint successfully stored at #3
template count : 4
Matched ID : 2
confidence : 110
<repeats endlessly>
ee77704715