Serial1 / Serial2 with Arduino nano esp32

Hardware Nano Family Nano ESP32
1

I want to use a fingerprint sensor with an Arduino nano esp32 and the Adafruit Fingerprint sensor library. It works fine with an Arduino Uno. My problem now is that the nano doesn´t really seem to have hardwareserial 1 and 2. I researched that they should be on GPIO 9 + 10 || GPIO 16 + 17. I tried using Serial1 which should be GPIO 9+10 -> D6+D7, but it didn´t work. Serial2 is not possible, cause the nano esp32 does not have the GPIO 17...
Any ideas which Serial I should use and which pins they are on the microcontroller?
(Serial 0 is not an option because the esp32 needs to be connected to my PC)

#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);
2

Welcome to the forum

You can assign which pins are used by the Serial interfaces

See ESP32 UART Communication Pins Explained with Example

3

Thanks for the quick answer. I've already been so far. I have:

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


HardwareSerial SerialPort(1);

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

I know that I could change the pins for the SerialPort by using:

SerialPort.begin(57600, SERIAL_8N1, 2, 3);

This is usually called in the setup() funtion. But this wouldn't make any sense in the code and also doesn't work. Is there a way to define my hardwareserial directly with the wanted pins? Or how should I change the code so that the object finger gets the right Serial?

4

Why not ?

5

Yes, using that sentence, I was able to change the ports, in my case 5 and 6, and it works to me.
Thank you!!