Problem with Fingerprint scanner
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Problem with Fingerprint scanner

by MikeDotNet on Sat Feb 09, 2013 12:07 pm

I'm having problems with my new fingerprint scanner. Using the Windows program (after loading the Arduino passthrough sketch). I connect to the proper COM port and the info pane says,
Open Device Success!
However, the Hardware Information still says,
Welcome to use SFG Fingerprint Module Demo. Please Open Device First!
and Baud Rate, Package Size, and Secure Level are blank. When I try to enroll, it says,
Please put your finger to sensor!
but nothing happens after that.

The Arduino enroll example:
fingertest
Found fingerprint sensor!
Type in the ID # you want to save this finger as...

But when I enter a number and click "Send", nothing happens.

The Arduino fingerprint example:
fingertest
Found fingerprint sensor!
Waiting for valid finger...

The scanner lights up and blinks, but of course there are no fingerprints enrolled so it doesn't find a match.

Please help!
Attachments
ScreenShot.png
Screen Shot of SFG Demo
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Re: Problem with Fingerprint scanner

by adafruit_support_bill on Sat Feb 09, 2013 12:45 pm

The arduino example code and the SFGDemo code use different wiring, which way do you have it wired?

Post a photo showing your connections to the Arduino.
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Re: Problem with Fingerprint scanner

by MikeDotNet on Sat Feb 09, 2013 1:04 pm

I don't think I would have gotten the "Found fingerprint sensor" messages if it were wired wrong. But anyway, I wired it just like the tutorial:

Red = 5v
Black = GND

For the Windows program: White = D0, Green = D1
For Arduino sketches: White = D3, Green = D2
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Re: Problem with Fingerprint scanner

by adafruit_support_bill on Sat Feb 09, 2013 1:57 pm

Did you solder pins or some thicker wire to the ends of the wires? The most common problem with these is an intermittent connection due to the thin wires.
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Re: Problem with Fingerprint scanner

by MikeDotNet on Sat Feb 09, 2013 3:16 pm

I used jumper wires with alligator clips and rechecked my connections. But again, both the Windows program and the sketches "see" the scanner so how could it be the connections?

The Windows program reports: "Open Device Success!"

Both sketches report: "Found fingerprint sensor!"

If I disconnect either wire, I get connection failure messages.
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Re: Problem with Fingerprint scanner

by adafruit_support_bill on Sat Feb 09, 2013 3:57 pm

both the Windows program and the sketches "see" the scanner so how could it be the connections?

The definition of an 'intermittent connection' is that it works some of the time. Disturbing the connection in any way - such as when scanning a fingerprint will disrupt communication. Most people find that they work much better if you solder the thin wires to a thicker jumper wire or pin.
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Re: Problem with Fingerprint scanner

by MikeDotNet on Sat Feb 09, 2013 4:12 pm

I agree with you about intermittent connections. I have rechecked my connections with a meter and they are all good.

Let's go back to the original symptom. In the Windows program, I connect to the COM port and the info pane says, "Open Device Success!" This should mean that it "sees" the scanner. Now, I haven't touched anything, but the Hardware Info pane does not have any information. It is still waiting for me to connect the scanner. There are also no values in the Baud Rate, Package Size, and Secure Level fields. Please see the attached screen shot.

I believe I have a bad scanner. I'm just asking if there is anything else I can try or can I just RMA it and get a new one.

Thanks,

Mike
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Re: Problem with Fingerprint scanner

by adafruit_support_bill on Sun Feb 10, 2013 11:14 am

Those symptoms are consistent with an intermittent or marginal connection. As mentioned, we have found that the most reliable way to connect to these thin wires is by soldering them.

If you believe that your connections are solid, contact support@adafruit.com with a link to this thread to arrange for a replacement.
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Re: Problem with Fingerprint scanner

by MikeDotNet on Mon Feb 18, 2013 6:59 pm

I deleted my previous post because, even though the new fingerprint scanner did not work with the Windows program, it does in fact work with the Arduino sketches. This is fine with me as I was only using the Windows program to test the scanner anyway. Thanks for your help!
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Re: Problem with Fingerprint scanner

by adafruit_support_rick on Mon Feb 18, 2013 9:05 pm

Great! Glad to hear it! :D
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Re: Problem with Fingerprint scanner

by mazri on Sun May 18, 2014 3:38 am

Com port of my arduino is 26 but it is not present in the " SFG Demo " 's Open device open . Please help me!
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Re: Problem with Fingerprint scanner

by mazri on Sun May 18, 2014 3:41 am

I can not find proper COM Port in "SFG Demo" Software. Please can anyone help me !!
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Re: Problem with Fingerprint scanner

by adafruit_support_rick on Sun May 18, 2014 4:41 am

This tutorial explains how to get rid of all those extra COM ports, so that your Arduino will show up in the range of SFG Demo
https://learn.adafruit.com/how-to-find- ... s/overview
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