Safe pins to use on Nano ESP32 S3

Official Hardware Nano Family Nano ESP32
1

i read on the web that only some of the pins of the ESP32 S3 are safe to use, while some of them are to be used with cautions, because involved in specific tasks, as boot, mode settings etc.

in detail the GPIO that are safe are the following: 1,2,4,5,6,7,8,15, 16,17,18.

the “unsafe” GPIO are the following: 3,9,10,11,12, 13,14,38,39,40,41,42,45.

i look at the pinout of the Nano Esp32, and i see that just 9 GPIO are exposed while othe 9 are part of the unsecure pins to use.

my questions are three:

  1. it is this true?

2)why arduino engineer expose pin considered unsecure (if this is true)

  1. what i should pay attention to, while using those “unsecure “pins?

thanks in advance to anybody would give an answer to me about this issue

2

They are all safe.

What you read on the web does not apply to the Nano ESP32.

1 Like
3

I don't know whether what @roberto59 read is true but, the Nano ESP32 uses the ESP32-S3 chip so he/she is right to be cautious

I hope that there is no confusion arising between the ESP32 chip pin numbers and the Nano ESP32 pin numbers

4

İ don’t think there is any difference between boards using the same processor, btw i found this information here : ESP32-S3-Zero Development Board Details, Pinout, Specs

5

But there is. The Nano ESP32 is one of them

6

As far i see, the many company producing esp32s3 in his different versions is just making different form factors and pins avalaible. Can you please explayn us why Arduino board’s esp32s3 should be different? Arduino esp32 have a different internal architecture?

8

If you look at the product webpage you will see that it actually uses the NORA-W106 processor which has an ESP32 embedded in it. The GPIO numbers are for the NORA not the ESP

So ALL are safe.

9

Thank you so much… finally have a useful reply….!

11

You and @vvb333007 are still confusing the NORA GPIO with the ESP GPIO

They are NOT the same

ALL pins are safe

12

Oh I didn’t read whole thread :). I saw question regarding ESP32 and ESP32S3 and rushed to help :).

Everything I said before - is about Espressif’s original chips.

PS:

I thought “Nano ESP32” is built on ESP32 :).

13

No.

14

Maybe you should go back and edit your posts

15

I guess you just want to believe what you want and ignore the facts.
Have fun!

16

Not really. The pinout Arduino publishes uses ESP32-S3 gpio numbering, not Nora.

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And while they exposed generally safe pins, Nano still has pins B0 (gpio46), B1(gpio0) and A2(gpio3), which are listed as strapping pins by Espressif.

17

According to the schematics and the datasheet they are the NORA GPIOs and there is nothing that would suggest otherwise.

18

"3.3 Pin-out" contains a table of ESP32-S3 GPIO pin correspondence:

19

Thank you so much, i didn’t not knowing this detail.

20

Because Ublox decided to use Esp32-S3 gpio numbering...

21

You are welcome