Fingerprint sensor does not work

[gte938x]

This fingerprint sensor looks like a broken one.

I connected it through bread board exactly like video tutorial, and made sure 5V is applied to the sensor.

However, everytime when I turn on power (plug USB to PC), the red background light of finger touch pad just flash once instead of stay on.

After load example program and serial communication window, it shows no sensor is found (of course).

Order number 703963-9668476854, delivered on 02/13/2015, product ID 751.

[adafruit_support_rick]

However, everytime when I turn on power (plug USB to PC), the red background light of finger touch pad just flash once instead of stay on.

This is the normal behavior.

After load example program and serial communication window, it shows no sensor is found (of course).

Not normal. Have you tried reversing the green and white wires?

Have you tried running the blank sketch and connecting to SFGDemo,exe on Windows?

[gte938x]

I tried all your requested. Still not working.
Reversed green and white. Still no response.
Run SFG demo, shows "open device fail"
I check in device manager, and selected the correct COM port.

[adafruit_support_rick]

How are the sensor wires connected to the header pins? Are they crimped or soldered? Are you sure the connections are solid?

[gte938x]

I ordered Experimentation Kit for Ardino(Uno R3). It comes with bread board and plug-in wires, which are what I used.
I made sure the connection is good, by measuring the same net with multimeter on different boards ( Uno and fingerprint sensor board).

[adafruit_support_rick]

Please email [email protected] with a link to this thread for a replacement sensor

[gte938x]

I received the replacement order today. Still does not work.
I guess I have a bad Uno board.
I purchased uno board with order number 701510-2135790032 on Feb 8, 2015.
Anything else I can try?

[adafruit_support_rick]

Hmmm... I doubt that the Uno is bad. Try using a different pair of pins for RX and TX. Try using digital 8 for RX and 7 for TX. Change the pin assignments in the sketch.

Also, try connecting the fingerprint sensor directly to the Uno - skip the breadboard.

If it still doesn't work, try reversing the white and green wires.

EDIT: Have you tried the fingerprint sensor with SFGDemo?

[gte938x]

Tried everything you asked, still does not work.
(1) change to "SoftwareSerial mySerial(8, 7);"
(2) green to digital pin 8, white to pin 7;
(3) reversed green and white.
(4) always connect directly without bread board.
(5) tried SFGDemo, "open device failed"

[adafruit_support_rick]

Are you sure those pins you crimped on the ends of the wires are solid connections? I can't think of anything else...

[gte938x]

yes, I double checked with ohm meter. From the net on uno board to the same net on fingerprint sensor board. It is beeping and 0 ohm.
I also tried 2 fingerprint sensors, with and without breadboard. I tried so many days with so many times.
If it is connection issue, I should be able to succeed once.
But I never see a success.

[adafruit_support_rick]

I honestly don't know what the problem is. If you email [email protected] with a link to this thread, they can issue you a refund for the fingerprint sensor.