Need help connecting Fingerprint Scanner - TTL (GT-511C3) over UART Serial Comms

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•

PaddeK

Okay.. i think it works now. I uploaded the module on my github so its easy to share.
Try this example to get you started:

let GT511 = require('https://github.com/PaddeK/espruino-gt511cxx/blob/master/gt511cxx.js');

let serial = Serial.find(B7);
serial.setup(9600, {rx: B7, tx: B6});

let g = new GT511(GT511.Devices.GT511C1R, serial),
    open = () => g.open(),
    close = () => g.close(),
    getTemplate = (t) => () => g.getTemplate(t);

let base64Enc = (bytes) => btoa(bytes.reduce((p, c) => p + String.fromCharCode(c), '')),
    base64Dec = (string) => E.toUint8Array(atob(string).split(''));

GT511.sequence([open, getTemplate(0), close]).then(result => {
    // result is an array that contains the return values of all functions called in the sequence (in same order)

    let template = result[1],
        b64 = base64Enc(template);

    console.log('template', template);
    console.log('base64', b64);
    console.log('validate', base64Dec(b64).slice(0, -1).toString() === template.toString()); // something is fishy here
}).catch(err => console.log(err));

And i guess i found a bug in espruino somewhere.. while converting the template back to a Uint8Array i have to remove a trailing zero.. which i have no clue why it is there in the first place.

•

user81574 in reply to @PaddeK

Hello @PaddeK, thanks for taking your time to try and sort somethings out.
I'm still getting a timeout error:

timeout exceeded

I have tried several alternatives in calling the getTemplate function, yet it still times out.

Also calling the enroll(t) function results in this error:

Error {
  "msg": "Expecting a function to call, got Object",
  "type": "Error",
  "stack": " at line 1 col 1\nfn().then(res.concat.bind(res))\n^\nin function called from system\n"
 }

after setting enroll with enroll = (t) => () => g.enroll(t); and passed it into the GT511.sequence array I got this error

enroll error:  Error {
  "msg": "Function \"switchLED\" not found!",
  "type": "Error",
  "stack": " at line 1 col 6\nthis.switchLED(!!b)\n     ^\nin function \"fn\" called from line 1 col 4\nfn().then(res.concat.bind(res))\n   ^\nin function called from system\n"
 }

Need help connecting Fingerprint Scanner - TTL (GT-511C3) over UART Serial Comms

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