Arduino fingerprint sensor ID 751 images

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equinteros
 
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Arduino fingerprint sensor ID 751 images

Post by equinteros »

Hello,

I’m very new to the world of Arduino and am still learning the basics. I recently purchased the fingerprint sensor (ID 751) in order to obtain images of fingerprints using my Arduino Uno (first project other than the ones in the starter kit). I followed all the directions in the tutorial and used the “SFGDemo” program. The program worked only once (was able to get images), the next day, I would just get the “open device fail” window. I then soldered the wires to pins in the hopes that it was a connection issue but, I kept getting the same “open device fail”. I then tried the libraries provided by adafruit and the sensor worked perfectly fine, I was able to enroll prints and also find matches for them. So I’m thinking the program is not functioning correctly, since many people have posted questions in regards to the same problem (I made sure all the wires were connected to the correct pins every time). My main goal is to obtain images on my computer. Are there any tips on using the program? Also, is it possible to just get the images of the prints by not using the SFG program? Any help would be greatly appreciated, thank you.

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adafruit_support_rick
 
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Re: Arduino fingerprint sensor ID 751 images

Post by adafruit_support_rick »

Does the 'open device fail' popup appear immediately, or does it take a few seconds before it pops up? If it takes a few seconds, then it's a problem with your wiring.

If it appears immediately, that seems to be a problem with either Windows or SFGDemo itself. Unfortunately, I don't know how to fix it. My own Windows system does the same thing.

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equinteros
 
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Re: Arduino fingerprint sensor ID 751 images

Post by equinteros »

The window pops up after about 30 seconds or so. At first I thought it was a wiring problem which is why I soldered pins to the wires and I still had the same issue. I used the library provided by adafruit and the fingerprint sensor worked perfectly. The only problem is when I try to use the SFGDemo (I also made sure the wires were in the correct pins).

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adafruit_support_rick
 
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Re: Arduino fingerprint sensor ID 751 images

Post by adafruit_support_rick »

equinteros wrote:The window pops up after about 30 seconds or so.
That means that SFGDemo is opening the COM port, but is not getting a response back from the fingerprint sensor.
Try reversing your TX and RX wires.

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equinteros
 
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Re: Arduino fingerprint sensor ID 751 images

Post by equinteros »

Yes, I also tried changing the pins as well but I had the same result.

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adafruit_support_rick
 
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Re: Arduino fingerprint sensor ID 751 images

Post by adafruit_support_rick »

please post clear, detailed pictures showing your wiring

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equinteros
 
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Re: Arduino fingerprint sensor ID 751 images

Post by equinteros »

Here are the first two attachments showing that the sensor is functional when using the adafruit library.
Attachments
20150121_150412working.png
20150121_150412working.png (964.14 KiB) Viewed 477 times
working.png
working.png (53.78 KiB) Viewed 477 times

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equinteros
 
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Re: Arduino fingerprint sensor ID 751 images

Post by equinteros »

Here are the last three showing that the sensor is not working correctly.
Attachments
20150121_145925notworking.png
20150121_145925notworking.png (825.25 KiB) Viewed 477 times
not owrking 2.png
not owrking 2.png (191.66 KiB) Viewed 477 times
notworking.png
notworking.png (216.01 KiB) Viewed 477 times

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adafruit2
 
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Re: Arduino fingerprint sensor ID 751 images

Post by adafruit2 »

we didnt write the SFG demo program so we dont really know any more than you do - it just came on a CD with the sensors (they're meant to be used in safes or something)
& we only use it for basic tests when the arduino stuff doesnt work.
you could try a different USB->serial converter if you have one, like an FTDI or PL2303 cable. that's the only thing we can suggest!

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irfan_afgan
 
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Re: Arduino fingerprint sensor ID 751 images

Post by irfan_afgan »

can u send me the code you are using... cos i think you are few steps ahead of me... at least i can be there where you are... thanx

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Re: Arduino fingerprint sensor ID 751 images

Post by irfan_afgan »

can u send me the code you are using... cos i think you are few steps ahead of me... at least i can be there where you are... thanx

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adafruit_support_rick
 
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Re: Arduino fingerprint sensor ID 751 images

Post by adafruit_support_rick »

@equinteros - This is a known problem with SFGDemo. I have the same problem on my Windows box. We don't know of any way to fix it.

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