Guide by Tim; Fingerprint Scanner with Raspberry Pi Single Board Computer - Unlock with Biometrics!

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Hello Tim! I am getting these errors, could you help me out?

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Hi Kou,

We’ll have to see your whole error stream to get a proper idea of what’s going on. You can access the forum via the web browser on your Pi, so could you copy the full message in between 3 backticks (`) into a post here?

That’ll help us troubleshoot this one :slight_smile:

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Hello James, here is the error

%Run fingerprint_simpletest_rpi.py
Traceback (most recent call last):
File “/home/kouma17/Adafruit_CircuitPython_Fingerprint/examples/fingerprint_simpletest_rpi.py”, line 22, in
finger = adafruit_fingerprint.Adafruit_Fingerprint(uart)
File “/usr/local/lib/python3.9/dist-packages/adafruit_fingerprint.py”, line 120, in init
if self.verify_password() != OK:
File “/usr/local/lib/python3.9/dist-packages/adafruit_fingerprint.py”, line 136, in verify_password
return self._get_packet(12)[0]
File “/usr/local/lib/python3.9/dist-packages/adafruit_fingerprint.py”, line 348, in _get_packet
raise RuntimeError(“Failed to read data from sensor”)
RuntimeError: Failed to read data from sensor

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Hey Kou,

Seems that the Pi is having trouble communicating with the Fingerprint sensor. Try running:

ls /dev/tty*

You should see a list of available serial ports, including the one that the fingerprint sensor is connected to. If you do not see the sensor’s serial port, there may be an issue with the sensor or the connection.

If you can see it is recognised, ensure that the baud rate setting of the fingerprint sensor matches the baud rate setting of the uart object in your Python code. The default baud rate for the fingerprint sensor is 57600, but it can be changed using the set_baud_rate() method.

Cheers,
Blayden

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Hello sir,
i have a quick question about some parts
I’m using a capacitive fingerprint sensor and ttl usb adapter, and when i run the program, it doesn’t work.
Can i get a hint about what to change, please ?

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My Error: AttributeError: module ‘adafruit_fingerprint’ has no attribute ‘Adafruit_Fingerprint’

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This error can occur if you attempt to import the wrong file - Python does not distinguish between a script and a library module. What is the name of you script file?

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fingerprint_simpletest_rpi.py

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![IMG-20230830-WA0000|690x388](upload://6yGth2EMwYMWcUkEbolKEZQL10T.jpeg

Hi Tim,

This is the error im facing.
And ttyS0 is listen in ls /dev/tty* command.
I don’t know how to set baud rate but im using default 57600 only.

IMG_20230830_125825
IMG_20230830_1258251920×1446 254 KB

IMG_20230830_125808
IMG_20230830_1258081920×1446 227 KB

IMG_20230830_125802
IMG_20230830_1258021920×1446 103 KB

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Hello, I have the same problem as Ali255702, do you have any idea what it could be?
I using fingerprint_simpletest_rpi.py and the fingerprint is ADA-751

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It was a connection problem, use connecting pins or get the holes soldered

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I need information on combining face recognition and fingerprints using Raspberry Pi operating both offline and online modes

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Hi Moses,

Welcome to the forum!

We have a guide on Face Recognition With Raspberry Pi and OpenCV that should get you started in the right direction, you will need to adapt it to your specific use case.

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i’m using this on a raspberry pi 5 and it says:

%Run fingerprint_simpletest_rpi.py
Traceback (most recent call last):
File “/home/louay/Adafruit_Circuit Python_Fingerprint/examples/fingerprint_simpletest_rpi.py”,
line 17 uart serial. Serial(“/dev/ttyS0”, baudrate=57600, timeout=1)
IndentationError: unexpected indent

i also didn’t find ttyS0 when i used ls /dev/tty* even tho it was there when i ran this on pi 3b (same issue btw)
i also tried ls -l /dev/serial* and it returned:

lrwxrwxrwx 1 root root 8 Apr 26 17:19 /dev/serial0 → ttyAMA10

i changed the code to serial0 and AMA10 and didn’t work.

Edit: I USED /dev/ttyAMA0 and it worked, looks like raspberry pi 5 doesn’t have ttyS0

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