GT-521F52 not functional out of box

Sensors Biometrics
1

Hi, I got the GT-521F52 fingerprint scanner a few days ago, and I’ve tried to get it to work by connecting it to a MKR1000 Arduino. I’ve connected like so:

NPuMDax.png570×757 439 KB
https://i.imgur.com/NPuMDax.png

I’ve tried getting the LED backlight to blink, but the Arduino stalls on ```
while(!Serial.available());

This tells me that the fingerprint scanner is completely unresponsive. I've also tried hardware hookup method #3 in this link: [https://learn.sparkfun.com/tutorials/fi ... okup-guide](https://learn.sparkfun.com/tutorials/fingerprint-scanner-gt-521fxx-hookup-guide). None of these efforts were fruitful. Do you think my device is faulty?

Thanks
2

Try swapping TX and RX. TX on the sensor needs to connect to RX on the Arduino and vice versa.

/mike

3

In the picture that I provided, TX on the sensor is already connected to RX on the Arduino, and vice versa. The connections go like this:

Black (TX sensor) → RX Arduino

Red (RX sensor) → TX Arduino

Blue (GND) → GND

Yellow (Vin) → Vcc

4

Sorry about that; it was a little hard seeing the black wire next to the black board. A little googling on the MKR1000 shows that Serial connects to the USB port and Serial1 to the RX and TX pins. Try replacing Serial with Serial1 in the code.

/mike

5

You are a wizard. Thank you!