fingerprint sensor doesn't work

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lina
 
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fingerprint sensor doesn't work

Post by lina »

I can't get the fingerprint sensor to work. I can compile the sketch to read a fingerprint. The sensor blinks on then off. The program says it can't find the sensor. please help, I need this for a school project.
Thanks

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BeerCannon
 
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Re: fingerprint sensor doesn't work

Post by BeerCannon »

lina,

It's going to be hard for anyone to help unless you post your code and describe or attach pics of how you have things connected in your circuit. Maybe have a peek at these guidelines http://forums.adafruit.com/viewtopic.php?f=25&t=12170 too.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

I set it up just like your video said to using pins 2,3 and gnd and 5volts. Used the software provided. It is acting like there is something wrong with the sensor

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

Did you solder pins or some solid-core wire to the ends of the sensor wires? The sensor wires themselves are too thin to make a reliable connection.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

Yes I soldered the wires to solid core wire

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

It is acting like there is something wrong with the sensor
Have you tried the SFG Demo software? http://www.adafruit.com/datasheets/SFGDemoV2.0.rar
If it is giving you error messages, tell us what those messages are.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

The windows based software works erratically. After many tries it finally recognizes the hardware sometimes.
When I try to use the arduino software it says the fingerprint scanner cannot be found. The software compiles ok and the serial monitor asks for a fingerprint, then states the message that it can't find the sensor. I am getting very frustrated with this and wish I had not bought it.
Lina

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

After many tries it finally recognizes the hardware sometimes.
When it recognizes the device, what information does it display about the device. Post a screen shot if possible.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

Your system will not let me attach a document and I don't have a public place to store my images. so how am I suppose to post my screen shots?

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

It will accept JPGs and PNGs. If they are large, try re-sizing to about 800x600.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

Since I can not post my screenshot all that I can tell you is what I see. When I compile the sketch it says--
Fingerprint
Did not find fingerprint sensor : {

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

screenshots
Attachments
last screen shot
last screen shot
last screen shot.jpg (146.48 KiB) Viewed 1448 times
second screen shot
second screen shot
second screen shot.png (282.51 KiB) Viewed 1448 times
first screen shot
first screen shot
first screen shot.png (653.01 KiB) Viewed 1448 times

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

OK. We've been testing with a few of these sensors here in our lab and have a couple of suggestions:

For SFGDemo communication: The sensor (or SFGDemo) seems to get confused after a few connection attempts. It usually helps to power-cycle the sensor between connection attempts.
Also, be sure to run the blank sketch when using SFGDemo. Any Arduino serial communication will interfere with SFGDemo.

For Arduino communication: When running the example sketches, you have to connect to different pins. The example sketches are expecting the connections on Arduino pins 2 and 3.

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lina
 
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Re: fingerprint sensor doesn't work

Post by lina »

I had already uploaded blank file when using the windows based software
I had already changed the pins to 2,3 when using the arduino sketch
The screen shots I sent to you had already reflected the above.

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adafruit_support_bill
 
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Re: fingerprint sensor doesn't work

Post by adafruit_support_bill »

OK. From your screen shots, SFGDemo reports that the device is communicating at 9600 baud. The default rate for the "enroll" sketch is 57600.

Code: Select all

  // set the data rate for the sensor serial port
  finger.begin(57600);
Change that to match the SFGDemo detected baud rate.

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