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Topic: ESP wroom 32 & FPS_GT511C3 (Read 86 times) previous topic - next topic


how can i connect the esp32 with  fingerprint sensor GT511C3

this is my code it compiled successfully but the controller restarted

this is the code:

   FPS_Enroll.ino - Library example for controlling the GT-511C3 Finger Print Scanner (FPS)
   Created by Josh Hawley, July 23rd 2013
   Licensed for non-commercial use, must include this license message
   basically, Feel free to hack away at it, but just give me credit for my work =)
   TLDR; Wil Wheaton's Law

        Description: This simple sketch turns the LED on and off similar to the Arduino blink sketch.
   It is used to show that communications are working.
   This code should work with the any model of ADH-Tech's FPS as long as
   you are within the minimum logic level threshold for the FPS serial UART.
   This code has been tested with these models:

              GT-521F52 [ https://www.sparkfun.com/products/14585 ]
              GT-521F32 [ https://www.sparkfun.com/products/14518 ]
              GT-511C3  [ https://www.sparkfun.com/products/11792 ]
              GT-511C1R [ https://www.sparkfun.com/products/13007 ]

#include "FPS_GT511C3.h"
#include "SoftwareSerial.h"

/*-------------------- HARDWARE HOOKUP with 5V Arduino --------------------
1.) Dedicated Bi-Directional Logic Level Converter (LLC)

It is recommended to use a dedicated bi-direcitonal LLC
[ https://www.sparkfun.com/products/12009 ] for a reliable connection if you
are using a 5V Arduino microcontroller:

   Fingerprint Scanner (Pin #) <-> Logic Level Converter <-> 5V Arduino w/ Atmega328P
     UART_TX (3.3V TTL)(Pin 1) <->     LV1 <-> HV1       <->  RX (pin 4)
     UART_RX (3.3V TTL)(Pin 2) <->     LV4 <-> HV4       <->  TX (pin 5)
           GND         (Pin 3) <->     GND <-> GND       <->     GND
      Vin (3.3V~6V)    (Pin 4) <->        HV             <->      5V
                                          LV             <->     3.3V
2.) Voltage Division w/ 3x 10kOhm Resistors

Otherwise, you could use 3x 10kOhm resistors [ https://www.sparkfun.com/products/11508 ]
to divide the voltage from a 5V Arduino down to 3.3V FPS similar to the
"Uni-Directional" application circuit on our old logic level converter
[ https://cdn.sparkfun.com/assets/b/0/e/1/0/522637c6757b7f2b228b4568.png ]:

    Voltage Divider         <-> Fingerprint Scanner(Pin #) <-> Voltage Divider <-> 5V Arduino w/ Atmega328P
                            <-> UART_TX (3.3V TTL) (Pin 1) <->                 <->       RX (pin 4)
  GND <-> 10kOhm <-> 10kOhm <-> UART_RX (3.3V TTL) (Pin 2) <->      10kOhm     <->       TX (pin 5)
          GND               <->        GND         (Pin 3) <->       GND       <->        GND
                            <->    Vin (3.3V~6V)   (Pin 4) <->                 <->        5V
Note: You can add the two 10kOhm resistors in series for 20kOhms. =)


// set up software serial pins for Arduino's w/ Atmega328P's
// FPS (TX) is connected to pin 4 (Arduino's Software RX)
// FPS (RX) is connected through a converter to pin 5 (Arduino's Software TX)
//FPS_GT511C3 fps(4, 5); // (Arduino SS_RX = pin 4, Arduino SS_TX = pin 5)

/*If using another Arduino microcontroller, try commenting out line 59 and
uncommenting line 68 due to the limitations listed in the
library's note => https://www.arduino.cc/en/Reference/softwareSerial . Do
not forget to rewire the connection to the Arduino*/

// FPS (TX) is connected to pin 10 (Arduino's Software RX)
// FPS (RX) is connected through a converter to pin 11 (Arduino's Software TX)
FPS_GT511C3 fps(22, 23); // (Arduino SS_RX = pin 10, Arduino SS_TX = pin 11)

void setup()
   Serial.begin(9600); //set up Arduino's hardware serial UART
   //fps.UseSerialDebug = true; // so you can see the messages in the serial debug screen
   fps.Open(); //send serial command to initialize fps

void loop()
   // FPS Blink LED Test
   fps.SetLED(true); // turn on the LED inside the fps
   fps.SetLED(false);// turn off the LED inside the fps


You can check out my library for using these GT-5X sensors:


There are examples for using your sensor with the ESP32 HardwareSerial ports.

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