Fingerprint Sensor GT-511C1R Help

Hi

I’m hoping someone can help me. I am having trouble getting the Fingerprint sensor GT-511C1R working with my Arduino Uno.

It was working until earlier today but has now stopped responding.

I was able to use the test example sketches to get the LED to blink and also able to register and recognise a fingerprint. Whilst running through the enrol sketch for the second time I was getting an error as it couldn’t see a fingerprint. Now for some reason even the blink sketch isn’t working.

When going into the serial monitor the text below is printed:

FPS - Open
FPS - SEND: “55 AA 01 00 00 00 00 00 01 00 01 01”

This is where it hangs. There should be a third line where it receives a response. This is the exact issue I had with the first device I received which was replaced. This second device worked great until now, around 2 weeks, and the same has now happened.

It is connected correctly with the supply being 5V DC as instructed and the TX RX going through a voltage divider to bring the voltage down to 3.2V.

If anyone can help, or if a moderator could give any advice to try I would appreciate it. This is part of my BEng Hons Dissertation project which I only have a week left on, so my back is up against the wall a little.

Thanks in advance

Kev

Updated and resolved.

Thanks to Matt from Pimoroni for his help in replacing the unit the next day for me.

The new unit still wouldn’t work so I searched further and found the following link:

This states that the voltage divider on the TX and RX is NOT required. I tried this and it worked perfectly. This is despite all the test sketches and instructables pages saying it is required.

Really happy now,

Thanks again

Kev