GT-511C1R Fingerprint Scanner

Troubleshooting
21

Just wanted to re-open this thread as it appears there’s a few of us having trouble with the linked library. Specifically:

Hoping someone out there may have an idea on how to get this working.

Many thanks.

22

I have no hardware to test this either (just as @peekay123), but looking at the issue description there this seems to be the code part that needs altering
https://github.com/pkourany/FPS_GT511C3_Library/blob/master/FPS_GT511C3.cpp#715

	while (done == false)
	{
		firstbyte = (byte)Serial1.read();
		if (firstbyte == Response_Packet::COMMAND_START_CODE_1)
		{
			done = true;
		}
	}

to something like this

        uint32_t msTimeout = millis();
	while (!done && (millis() - msTimeout < WAIT4RESPONSE))  // #define WAIT4RESPONSE has to be set to an appropriat value
	{
		firstbyte = (byte)Serial1.read();
		if (firstbyte == Response_Packet::COMMAND_START_CODE_1)
		{
			done = true;
		}
                Particle.process();  // keep the device responsive to cloud activities like OTA flash
	}
        if (!done) return NULL; // the response pointer has to be checked for !NULL on the calling side

Give this a try with your hardware and let us know if this helped

1 Like
23

I sent a PR to https://github.com/pkourany/FPS_GT511C3_Library with my fully working classroom fingerprint scanner and a link to find the 3D printed case etc.

2 Likes
24

For those interested in using this FPS module:

There seems to be a problem to compile a sketch for this FPS with the new library in the web IDE. (even with the ‘old’ library ported by @peekay123)

=> There is another thread where this is discussed. Here is the LINK
:sweat: