Finger Print Sensor Not Detecting

Question

I am using an R307 Finger Print Sensor. I have done all the wiring connections as described in tutorial.

Red wire:vcc
Black wire:GND
Green wire: Arduino Uno pin 2
White wire: Arduino Uno pin 3

But i am getting error: Did not find fingerprint sensor. Function finger.verifypassword() always fails. How to get rid of this error ? I am using #include adafruit Fingerprint.h library by adafruit and #include softwareSerial.h Standard Libraries.

Without any code or example, no one can guess what is happening. — Federico Navarrete, May 02 '18 at 06:51
(https://cdn-learn.adafruit.com/downloads/pdf/adafruit-optical-fingerprint-sensor.pdf) — Alex Baban, May 02 '18 at 17:31

Gerhard · Answer 1 · 2018-05-07T07:40:07.277

1

You need to connect to Arduino pins 0 and 1 for serial comms. Pin 2 & 3 are not going to get you anywhere. RX is the white wire and goes to pin 0, TX is the green wire and goes to pin 1.

Edit:
If you need to use soft serial first try with normal serial on pins 0,1 and verifying everything is functional before moving to soft serial.

edited May 07 '18 at 07:40

answered May 02 '18 at 13:30

Gerhard

6,850
8
51
81

1

He is probably using software serial on pins 2 & 3. – gre_gor May 03 '18 at 15:17
@gre_gor I did not even think of the option. I think that is what he is trying... – Gerhard May 07 '18 at 07:41

Finger Print Sensor Not Detecting

1 Answers1