Ultra-Slim Round Fingerprint Sensor not found :) Error.

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saarth
 
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Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

Hello! I bought the Ultra-Slim Round Fingerprint Sensor and 6-pin Cable PID: 4750 on November 5, 2022.
After plugging into my Elegoo Uno board with the correct wiring, I tried running the "enroll" example from the adafruit fingerprint library. However, I am getting a "Fingerprint sensor not found :)" error message no matter how I wire my circuit.

I have tried:
1. Red wire to 3.3 V
2. Black wire to GND
3. Green wire to pin 2.
4. Yellow wire to pin 3.

I also tried switching the Green and Yellow wires to pins 2 and 3, respectively.

Nothing seems to work! :(

Any help is greatly appreciated.

Attaching a picture of my circuit and the message on Arduino IDE.
Attachments
circuit.jpg
circuit.jpg (938.02 KiB) Viewed 135 times
Screenshot 2022-11-12 at 3.00.39 PM.png
Screenshot 2022-11-12 at 3.00.39 PM.png (431.49 KiB) Viewed 135 times

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bidrohini
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by bidrohini »

Bad cables can be a reason. Please check the continuities of your cables. If the cables are not bad, maybe you should go for a replacement of the sensor.

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adafruit_support_carter
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by adafruit_support_carter »

How are the splices being made under the black tape? Are they soldered?

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saarth
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

I double checked my wire continuities. It seemed to work for a while before I started getting the same error after using it with the SFG Demo software.

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saarth
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

adafruit_support_carter wrote: Tue Nov 15, 2022 11:21 am How are the splices being made under the black tape? Are they soldered?
They are not soldered as of now but twisted together. It worked for a bit before throwing the same error however.

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saarth
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

Quick Update: The sensor now works with SFG Demo software but gives "Sensor not found :(" error when using with adafruit library examples.

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adafruit_support_carter
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by adafruit_support_carter »

Try soldering the connections are somehow making a more solid electrical connection. The connections may be marginal. That'll pass a basic continuity test, but then have issues with the high speed traffic that occurs when actually trying to talk to the sensor.

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saarth
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

Got the wires soldered. Still the same- "Fingerprint sensor not found :(".

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adafruit_support_carter
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by adafruit_support_carter »

Ah! Sorry, should have tried this sooner. Forgot that sensor may have two different baud rates. See this comment on product page:
https://www.adafruit.com/product/4750
This sensor now uses 57600 baud but some older versions were set to 115200 baud rather than the 'standard' 57600 used by many other sensors, so you may need to update the examples to 115200 baud for the sensor to respond (just try both!)
Try changing the sketch to use 115200 instead of the default 57600. To do that, change this line:

Code: Select all

  finger.begin(57600);
to:

Code: Select all

  finger.begin(115200);

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saarth
 
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Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.

Post by saarth »

Awesome, that worked!
My bad, I should have double checked notes on the product page.

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