Help with Fingerprint scanner (Product ID #751)

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cwalsh
 
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Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

I'm having some trouble with the Adafruit fingerprint scanner (Product ID #751). I have followed your tutorial https://learn.adafruit.com/adafruit-opt ... nt-sensor/. I have got it working (enrolling users and searching for them) using the windows software and an Arduino Uno Rev. 3 (White wire -> TX (1) and Green wire RX(0)).
serial.jpg
serial.jpg (340.46 KiB) Viewed 918 times
I am however unable to get the supplied Fingerprint example code working. I have installed the supplied libraries and the sketch complied with no errors and i have wired the fingerprint sensor according to the tutorial.
fingerprint sketch.jpg
fingerprint sketch.jpg (345.1 KiB) Viewed 918 times
This is the output in the serial monitor.

Code: Select all

fingertest
Did not find fingerprint sensor :(
The led in the scanner blinks when it gets power.
I measured the voltage getting to the connections under the sensor and i got a reading of 4.29v.
I tried using pins 8/9 for serial and i changed the code to correspond but that did not work.
I tried using my Arduino MEGA 2560 with the serial pins changed to 10/11.
While using the windows software the TX/RX lights on the board blinked.
I also soldered 22AWG solid-core hookup wire to the wires and I also soldered male header pins to the serial wires.
connections.jpg
connections.jpg (244.5 KiB) Viewed 918 times
I have also checked the connections under the sensor are secure.
Image
I have also read these forum posts several times http://forums.adafruit.com/viewtopic.php?f=19&t=50715 http://forums.adafruit.com/viewtopic.php?f=8&t=46302
I would appreciate your input/advice on what further steps I can take to make the fingerprint scanner work successfully with the Arduino.
Looking forward to hearing from you shortly.
Many thanks
Conor Walsh

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adafruit_support_rick
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by adafruit_support_rick »

Wow. You've got me totally stumped. Seems like you're doing everything right. I honestly don't know what to suggest.

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

Thanks for the fast response.
Is it possible that my fingerprint scanner is faulty?
Many Thanks,
Conor Walsh.

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adafruit_support_rick
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by adafruit_support_rick »

Well, if it works with Windows, then there's nothing wrong with it. I forget - does the windows software tell you what baud rate the sensor is running at? Maybe it's running at a different rate than the Arduino code is expecting.

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

The arduino code and software are both running at 57600.
baud.jpg
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MJU
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by MJU »

Maybe this topic could help? http://forums.adafruit.com/viewtopic.ph ... 63#p291463

Here I try to make a flowchart of commands to make the scanner work.
Maybe that topic can be the start of a helpfile for the scanner?

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adafruit_support_rick
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by adafruit_support_rick »

Could you have possibly changed the password in Windows? It should be 0

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

How do i check if the password is 0?
Thanks for your help so far.
Looking forward to your response,
Conor Walsh.

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adafruit_support_rick
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by adafruit_support_rick »

Hmmm...no, there's no way to look at or change the password in SFGdemo.
I don't know how else to check the password.

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

I definitely didn't intentionally change the password or remember having anything to do with the password.
I have been rechecking the settings and data in the SFG software and I can't find any anomalies in the settings.
The address of the scanner (0xFFFFFFFF) is the same as in the library also.
sfg.jpg
sfg.jpg (273.13 KiB) Viewed 853 times

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

I did however notice a few differences from the data in the tutorial software.
My finger database number is 1000 not 162
My product type is different
My sensor in the list is PG0305 not ZFS-20
data.jpg
data.jpg (63.34 KiB) Viewed 852 times
Thanks for your help so far,
Conor Walsh.

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

I was wondering if you had any further insight into the problems I am having with my fingerprint sensor.
Many Thanks,
Conor Walsh.

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adafruit_support_rick
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by adafruit_support_rick »

Still investigating.

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cwalsh
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by cwalsh »

Many Thanks for your help so far,
Conor Walsh.

sfizi
 
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Re: Help with Fingerprint scanner (Product ID #751)

Post by sfizi »

Hi adafruit staff
i just received from you the fingerprint scanner, i have the same problem of cwalsh. With the sfgdemo all works great but with arduino sketch it just don't start to blink the red light. Ihave the same sensor ZFM20 sensor too. How can i fix it?

Thanks

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