Fingerprint not responding

Other Hardware 3rd Party Boards
1

  • I'm using a STM32 F446RE microcontrolor with this fingerprint sensor
    (Amazon.ca).

  • Connexions:
    Red (pin 3) to 5V of STM32
    Green (pin 4) to PIN 2 of STM32
    White (pin 5) to PIN 3 of STM32
    Black, Yellow, Blue (pin 6, 2,1) to GND of STM32

  • I tried switching Green and White (PIN 2 to PIN 3) but still not working. Tried switching SoftwareSerial mySerial (2,3) to SoftwareSerial mySerial (0,1) because the Rx and TX are on PIN 0 and 1 of the STM32 but still not working.

  • I installed Adafruit_fingerprint library and opened the enroll example. Switched Serial1 to Serial2 (because of the STM32 USART as i was told), or it does not compile :

(Arduino:1.8.13 (Windows 10), Carte : "Nucleo-64, Nucleo F446RE, Mass Storage, Enabled (generic 'Serial'), None, Low/Full Speed, Smallest (-Os default), Newlib Nano (default)"

c:/users/dyott/appdata/local/arduino15/packages/stm32/tools/xpack-arm-none-eabi-gcc/9.2.1-1.1/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: sketch\enroll.ino.cpp.o: in function `_GLOBAL__sub_I_finger':

enroll.ino.cpp:(.text.startup._GLOBAL__sub_I_finger+0xc): undefined reference to `Serial1'

collect2.exe: error: ld returned 1 exit status

exit status 1

Erreur de compilation pour la carte Nucleo-64
)

  • When i open the serial monitor, i see :
    Adafruit Fingerprint sensor enrollment
    ??e%g'm?

  • The fingerprint sensor has no visible red light when plugged to 5V.

Anyone knows what is happening?

2

Please put the error code in code tags, that way it is much easier to read.

remi99:

  • The fingerprint sensor has no visible red light when plugged to 5V.

Your saying that it doesn't have a led? Do you mean that it has a led but that it doesn't light up?
Because in all examples I clearly see a green or red led in the sensor...
It might be broken, ask the seller if it is normal that nothing lights up, if it should ask for a replacement!

Isaak

3

You should go back to that store from where you bought it Sensor is basic of any electronic equipment.

4

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