ESP32 Forum

I am still fairly new to working with an esp32 cam and I have a question. Hopefully someone can help me.

I would like to connect my fingerprint reader to my esp32 cam and also use the adafruit fingerprint library. I just don't know which pins to use and how to indicate this in the arduino sketch. can someone help me with this?

Which interface do you use? UART? SPI? I2C?
You could refer to 4.2 Peripheral Pin Configurations in ESP32 Datasheet and see which pins you should use.

Hi,

The available pins are very limited on the esp32cam, my best understanding is:
If using the sd card (must be in 1-bit mode) the main io pins available for general use are 13 and 12 (12 must not be high at boot),
14, 2 & 15 should also be available if you are not using the SD Card.
You can also use pins 1 and 3 if you do not use Serial (looks like they are restricted to one being input only and the other output only?)
Pin 4 is the onboard flash LED which you could possibly remove and use this pin for output (it is via a transistor) but again sd card needs to be in 1-bit mode if you are using it otherwise the sd-card uses pin 4. pin 33 is another onboard led which could possibly be used?

BTW - I have a sketch (Arduino) where I try to implement everything I discover about using them which may be of interest: https://github.com/alanesq/esp32cam-demo

Looks like some good info here: https://github.com/raphaelbs/esp32-cam- ... p32-cam.md

Thank you for your answers.
If i want to use pin 12 and 13 for communication with the sensor, what do i need to change in the code so i can use these pins?

#include <Adafruit_Fingerprint.h>


#if (defined(__AVR__) || defined(ESP8266)) && !defined(__AVR_ATmega2560__)
// For UNO and others without hardware serial, we must use software serial...
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino (WHITE wire)
// Set up the serial port to use softwareserial..
SoftwareSerial mySerial(2, 3);

#else
// On Leonardo/M0/etc, others with hardware serial, use hardware serial!
// #0 is green wire, #1 is white
#define mySerial Serial1

#endif


Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

I finally found a way to use your fingerprint sensor using this library : Adafruit_Fingerprint.h
I tried this :


#include <Adafruit_Fingerprint.h>
#include <HardwareSerial.h>

HardwareSerial mySerial(0);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

I solved it with this code.

and the rest of the code is the same.

I was working on my smartdoorbell project and i wanted to integrate a fingerprint unlock based on face recognition.

Thanks, you helped me so much.

Franck NA - Madar

will you please contact me as soon as possible its very important for me as well. I am also working on this Project since last 3 months vaibhavadsare3333@gmail.com