Comments on: ESP32: Guide for MicroSD Card Module using Arduino IDE

By: Anand

Anand — Wed, 15 Jan 2025 11:44:39 +0000

In reply to Sara Santos. ok

By: Schuby

Schuby — Tue, 07 Jan 2025 14:29:12 +0000

In reply to Schuby.

I now know my problem.
I create 2 text files. The first text file has 10 lines with a blank line.
The second text file has 10 lines without a blank line,
so without LF or rather without #13#10

I can read the first file without any problems, but with the second I get a blank line. Until I send another command to the ESP32, now the last line of the file comes.

By: Sara Santos

Sara Santos — Tue, 07 Jan 2025 11:47:38 +0000

In reply to Peter.

Hi.
What pins are you using for the ESP32-S3?
Do you get any errors?
Regards,
Sara

By: Peter

Peter — Mon, 06 Jan 2025 20:28:31 +0000

Hello Sara, Have you tried this code with ESP32-S3? I think there is some issue with it. It works with other boards but not for S3. Have you come across any solution?

By: Sara Santos

Sara Santos — Thu, 02 Jan 2025 10:29:03 +0000

In reply to Julian Hines.

Hi.
Thank you so much for your tips.
I wasn’t aware there were modules that required the resistors.
Thank you.
Regards,
Sara

By: Schuby

Schuby — Wed, 01 Jan 2025 16:31:22 +0000

Hello, I have a problem with SD.h and FS.h
When I read a file I get all the information from the file.
But I don’t get a stop when the file has been read,
blank characters are sent. A blank line is added to my memo field every 1 second.
Until I send another command (query time) then it stops and I get a line with the end;01.01.2025
And then it goes quiet, everything else works. Only when I read a file. What could that be?
mfg

By: Julian Hines

Julian Hines — Tue, 31 Dec 2024 21:05:02 +0000

A quick note for people who are having the “Card Mount Failed” error – I was getting this and looked into the problem in detail. First, as Sara pointed out, some SD readers need 5V, some 3v3. I had bought a batch of ten 5V readers and was experimenting with these, attempting to get them to mount on various ESP32 and ESP8266 models, without any success. Then I read on the Espressif site that ALL the pins needed 10K pull-up resistors on them, even if they were not connected. I tried this and, glory be, it worked! I then bought some card readers that looked the same as in the example above, and these worked first time, without pull-ups. On examining the new readers, I noticed that they had four resistors built in to the card, all marked up (in tiny writing) as 10K. So, I suggest that you make sure the power supply is correct for the reader you purchase and if that does not work, try adding pull-up resistors from a 3v3 source to the data pins (CS, MISO, CLK and MOSI).

By: Antonio Cesar de Oliveira

Antonio Cesar de Oliveira — Sat, 28 Dec 2024 21:12:22 +0000

Excellente tutorial,
Can I do the same for TTGO?
Thanks,

Antonio Cesar

By: Geoffroy

Geoffroy — Wed, 09 Oct 2024 11:45:29 +0000

As all your tutorials, this is just great material and easy to listen.
While playing a bit with it and trying to record GPS position on the SD car, i faced an issue which appears to be a conflict between the Serial flow from NEO8M and the SPI of SD card. If no activation of GPS, no problem with SD card, but if activation of GPS, the AppendFile method will work one or 2 cycles and then says that can not find the file.
Would it be any reason for it ?

By: Mike Oshinski

Mike Oshinski — Mon, 07 Oct 2024 18:44:33 +0000

In reply to Sara Santos.

Hi Sara,
I have tried all the sketches for interfacing to an SD card and all give me the error “Card Mount Failed”. All connections are correct and I am using an ESP32 with the correct pins connected to the SD card. The SD card is powered with the 3.3 volts from the ESP32 (the SD cards run on 3.3 volts, not 5V).
I tried the examples from the IDE (Version 2.3.3), including the SDMMC, as well as some of your sketches. All have the same problem.
Have you tried this lately ?
Thanks for your support.