Fingerprint sensor

[ztrabelyk]

I just received my finger print scanner and I have been unable to get it to work. When I connect it to the Arduino it blinks on and off once not twice as in your tutorial. When I run the blank app and run the windows software it is unable to find the device. I have tried your procedures on two separate computers and two separate operating systems. I think I may have a defective scanner, please let me know what the issue could be thank you.

[adafruit]

can you post a photo showing your exact wiring using the blank sketch?

[ztrabelyk]

Here you go...when I run the enroll code it says that it detects the scanner however when I input a number and hit return it simply sits there. Additionally, when I hook it directly with the blank code and run SFGDemo it does not detect the scanner on the port (in my case it is com12).

The photo depicts the hookup for enroll using the software serial, when I run the blank code they are switched to 0 &1 respectively. The is so simple yet it will not work, it seems like I have been wasting a lot of time with a defective device.

FingerPrintScanner.jpg (381.18 KiB) Viewed 2412 times

FingerPrintScanner2.jpg (152.82 KiB) Viewed 2412 times

[adafruit_support_bill]

The photo depicts the hookup for enroll using the software serial, when I run the blank code they are switched to 0 &1 respectively.

For enroll you should be using the blank sketch and pins 0 & 1.

[ztrabelyk]

You are misunderstanding me...when I use the windows SFGDemo software I load the blank app onto the Arduino with the white wire connected to digital 0 and the green wire connected to digital 1 which is the second photo (I uploaded them in the wrong order). Since I was unable to enroll via the windows software I uploaded the enroll code which uses software serial as you know connected as represented in the first photo.

[adafruit]

it could very easily be flakey wiring. those connectors shoved into the headers dont do a good job. solder the wires to header an plug them in directly.

[ztrabelyk]

I took it one step further and I ran the fingerprint example and when I did the reader came to life, I then went back to the enroll code and (reading the code 'c' initializes the reader) it now works. The problem is that I still cannot get the windows software to work...have you had success with it under the windows 7 64 bit environment?? If so as an alternative to running the blank code I I simply removed the Atmel chip from my uno wouldn't that bypass it and turn the board into a usb to serial converter? I still would like to get the scanner working with the software since the enroll code is a bit quirky. Any help would be greatly appreciated.

[adafruit_support_bill]

I tested this on a Win-7/64 bit system. You have to run with administrative privileges to connect to the sensor. Right click on SFGDemo and select "Run As Administrator".

[sabor]

Hi I just received the fingerprint scanner this morning.
I am able to use it with the SFGDemoV2.0.
However, when I upload the code to my Arduino Mega it seems that it doesnt recognize the device.
Only error message "Did not find fingerprint sensor " shown in serial monitor.
I am pretty sure that the connection is correct as it is working with my Arduino Uno.

So, I would like to know if it is compatible with Arduino Mega 2560?
Thanks!

[adafruit_support_bill]

The device communicates via serial. There should be no compatibility issues with the 2560. Check to make sure all your connections are secure. Are you running the 'blank' sketch on your 2560?

[sabor]

When I run the 'blank' sketch on my 2560, it is able to work perfectly with the software SFGDemoV2.0
But when I run "enrol" with 2560, only "Finger test. Did not find fingerprint sensor " is shown in serial monitor.
Same problem occurs when "fingerprint"sketch is running.

I dont understand why is it is ok with my Uno but not my 2560 with the same code and connection.
Any suggestion?

[adafruit_support_bill]

There are some limitation of SoftwareSerial on the Mega:
Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

[sabor]

Yes you are correct!!!

It works with mega after I did the following modification:

Code: Select all

#if ARDUINO >= 100
SoftwareSerial mySerial(11, 10);
#else
NewSoftSerial mySerial(11, 10);
#endif

Whoo~~finally working after one whole day of troubleshooting
It's a lovely device!

Thanks so much and I really appreciate your prompt reply.

[bhrtrancao]

I am unable open the SFGDemoV2.0.rar PLEASE HELP

[adafruit]

download unrar or an equivalent tool for your OS - check google for unrar tools