I tried the fingerprint_template_file compare on one of the new fingerprint sensors https://www.adafruit.com/product/4750 and it fails with this result. I have not looked into it yet and don't have a datasheet for this sensor :-(
The "simpletest" works ok.
INFO: Sensor les not support LED. Error: Failed to read data from sensor
----------------
Fingerprint templates: [1, 2]
Number of templates found: 2
Traceback (most recent call last):
File "fingerprint_test.py", line 179, in <module>
if finger.read_sysparam() != adafruit_fingerprint.OK:
File "/home/pi/projects/fingerprint/adafruit_fingerprint.py", line 147, in read_sysparam
r = self._get_packet(28)
File "/home/pi/projects/fingerprint/adafruit_fingerprint.py", line 342, in _get_packet
raise RuntimeError("Failed to read data from sensor")
RuntimeError: Failed to read data from sensor
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
"""
`fingerprint_template_file_compare.py`
====================================================
This is an example program to demo storing fingerprint templates in a file. It also allows
comparing a newly obtained print with one stored in the file in previous step. This is helpful
when fingerprint templates are stored centrally (not on sensor's flash memory) and shared
between multiple sensors.
* Author(s): admiralmaggie
Implementation Notes
--------------------
**Hardware:**
* `Fingerprint sensor <https://www.adafruit.com/product/751>`_ (Product ID: 751)
* `Panel Mount Fingerprint sensor <https://www.adafruit.com/product/4651>`_ (Product ID: 4651)
"""
import serial
import adafruit_fingerprint
# import board (if you are using a micropython board)
# uart = busio.UART(board.TX, board.RX, baudrate=57600)
# If using with a computer such as Linux/RaspberryPi, Mac, Windows with USB/serial converter:
uart = serial.Serial("/dev/ttyUSB0", baudrate=115200, timeout=1)
# If using with Linux/Raspberry Pi and hardware UART:
# uart = serial.Serial("/dev/ttyS0", baudrate=57600, timeout=1)
# If using with Linux/Raspberry Pi 3 with pi3-disable-bte
# uart = serial.Serial("/dev/ttyAMA0", baudrate=57600, timeout=1)
finger = adafruit_fingerprint.Adafruit_Fingerprint(uart)
##################################################
def sensor_reset():
"""Reset sensor"""
print("Resetting sensor...")
if finger.soft_reset() != adafruit_fingerprint.OK:
print("Unable to reset sensor!")
print("Sensor is reset.")
# pylint: disable=too-many-branches
def fingerprint_check_file():
"""Compares a new fingerprint template to an existing template stored in a file
This is useful when templates are stored centrally (i.e. in a database)"""
print("Waiting for finger print...")
set_led_local(color=3, mode=1)
while finger.get_image() != adafruit_fingerprint.OK:
pass
print("Templating...")
if finger.image_2_tz(1) != adafruit_fingerprint.OK:
return False
print("Loading file template...", end="", flush=True)
with open("template0.dat", "rb") as file:
data = file.read()
finger.send_fpdata(list(data), "char", 2)
i = finger.compare_templates()
if i == adafruit_fingerprint.OK:
set_led_local(color=2, speed=150, mode=6)
print("Fingerprint match template in file.")
return True
if i == adafruit_fingerprint.NOMATCH:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Templates do not match!")
else:
print("Other error!")
return False
# pylint: disable=too-many-statements
def enroll_save_to_file():
"""Take a 2 finger images and template it, then store it in a file"""
set_led_local(color=3, mode=1)
for fingerimg in range(1, 3):
if fingerimg == 1:
print("Place finger on sensor...", end="", flush=True)
else:
print("Place same finger again...", end="", flush=True)
while True:
i = finger.get_image()
if i == adafruit_fingerprint.OK:
print("Image taken")
break
if i == adafruit_fingerprint.NOFINGER:
print(".", end="", flush=True)
elif i == adafruit_fingerprint.IMAGEFAIL:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Imaging error")
return False
else:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Other error")
return False
print("Templating...", end="", flush=True)
i = finger.image_2_tz(fingerimg)
if i == adafruit_fingerprint.OK:
print("Templated")
else:
if i == adafruit_fingerprint.IMAGEMESS:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Image too messy")
elif i == adafruit_fingerprint.FEATUREFAIL:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Could not identify features")
elif i == adafruit_fingerprint.INVALIDIMAGE:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Image invalid")
else:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Other error")
return False
if fingerimg == 1:
print("Remove finger")
while i != adafruit_fingerprint.NOFINGER:
i = finger.get_image()
print("Creating model...", end="", flush=True)
i = finger.create_model()
if i == adafruit_fingerprint.OK:
print("Created")
else:
if i == adafruit_fingerprint.ENROLLMISMATCH:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Prints did not match")
else:
set_led_local(color=1, mode=2, speed=20, cycles=10)
print("Other error")
return False
print("Downloading template...")
data = finger.get_fpdata("char", 1)
with open("template0.dat", "wb") as file:
file.write(bytearray(data))
set_led_local(color=2, speed=150, mode=6)
print("Template is saved in template0.dat file.")
return True
# pylint: disable=broad-except
def set_led_local(color=1, mode=3, speed=0x80, cycles=0):
"""this is to make sure LED doesn't interfer with example
running on models without LED support - needs testing"""
try:
finger.set_led(color, mode, speed, cycles)
except Exception as exc:
print("INFO: Sensor les not support LED. Error:", str(exc))
set_led_local(color=3, mode=2, speed=10, cycles=10)
while True:
print("----------------")
if finger.read_templates() != adafruit_fingerprint.OK:
raise RuntimeError("Failed to read templates")
print("Fingerprint templates: ", finger.templates)
if finger.count_templates() != adafruit_fingerprint.OK:
raise RuntimeError("Failed to read templates")
print("Number of templates found: ", finger.template_count)
if finger.set_sysparam(6, 2) != adafruit_fingerprint.OK:
raise RuntimeError("Unable to set package size to 128!")
if finger.read_sysparam() != adafruit_fingerprint.OK:
raise RuntimeError("Failed to get system parameters")
print("Package size (x128):", finger.data_packet_size)
print("Size of template library: ", finger.library_size)
print("e) enroll print and save to file")
print("c) compare print to file")
print("r) soft reset")
print("x) quit")
print("----------------")
c = input("> ")
if c in ("x", "q"):
print("Exiting fingerprint example program")
# turn off LED
set_led_local(mode=4)
raise SystemExit
if c == "e":
enroll_save_to_file()
elif c == "c":
fingerprint_check_file()
elif c == "r":
sensor_reset()
else:
print("Invalid choice: Try again")
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