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.
Ultra-Slim Round Fingerprint Sensor not found :) Error.
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Please be positive and constructive with your questions and comments.
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Ultra-Slim Round Fingerprint Sensor not found :) Error.
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- bidrohini
- Posts: 202
- Joined: Thu Oct 20, 2022 10:03 am
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
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.
- adafruit_support_carter
- Posts: 29457
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
How are the splices being made under the black tape? Are they soldered?
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
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.
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
They are not soldered as of now but twisted together. It worked for a bit before throwing the same error however.adafruit_support_carter wrote: ↑Tue Nov 15, 2022 11:21 am How are the splices being made under the black tape? Are they soldered?
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
Quick Update: The sensor now works with SFG Demo software but gives "Sensor not found :(" error when using with adafruit library examples.
- adafruit_support_carter
- Posts: 29457
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
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.
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
Got the wires soldered. Still the same- "Fingerprint sensor not found :(".
- adafruit_support_carter
- Posts: 29457
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
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
to:
https://www.adafruit.com/product/4750
Try changing the sketch to use 115200 instead of the default 57600. To do that, change this line: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!)
Code: Select all
finger.begin(57600);
Code: Select all
finger.begin(115200);
- saarth
- Posts: 7
- Joined: Thu Nov 10, 2022 10:27 pm
Re: Ultra-Slim Round Fingerprint Sensor not found :) Error.
Awesome, that worked!
My bad, I should have double checked notes on the product page.
My bad, I should have double checked notes on the product page.
Please be positive and constructive with your questions and comments.