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Arduino IDE 2.3.6 on Win11 - no 9600 and 115200 baud for ESP32 ESP-WROOM-32U

fachman1964 1500 15
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  • #1 21751542
    fachman1964
    Level 5  
    Posts: 374
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    I have a problem with the Arduino IDE and the ESP32 ESP-WROOM-32U. In arduino IDE 2.3.6 and win11, I do not have the option to select the baud rate of the serial port ANI 9600 or 115200 from the expanded list. There are no such values in the list.
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  • #2 21751548
    inot
    Level 38  
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    This is impossible. Show what it looks like.
  • #3 21751557
    fachman1964
    Level 5  
    Posts: 374
    Rate: 58
    This is what it looks like
    Arduino IDE interface with garbled characters in serial monitor I asked AI and he says it's not possible! And yet.
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  • #4 21751567
    inot
    Level 38  
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    Start by setting 9600 baud. You can see that the microcontroller is sending something, only the speed doesn't match.
  • #5 21751573
    fachman1964
    Level 5  
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    Not on the list.
  • #6 21751576
    Anonymous
    Level 1  
  • #7 21751581
    inot
    Level 38  
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    I own the same version and with me it is on the list.
  • #8 21751582
    fachman1964
    Level 5  
    Posts: 374
    Rate: 58
    But what am I doing wrong that it's not there with me.
    And one more question. I have an older computer still with win7 and arduino ide 1.8.19
    there supposedly the compiler will not work due to the lack of some PYTHON libraries for win7? This is what AI claims.
  • #9 21751586
    inot
    Level 38  
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    And what is the lowest value on the list?
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  • #10 21751589
    fachman1964
    Level 5  
    Posts: 374
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    1300 - 1600 - 1750 - 11200 - 1480 - 19600 ----- etc much the highest is 12000000 Previously I also wrote about win7 I ESP maybe you know something about it
  • #11 21751608
    inot
    Level 38  
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    fachman1964 wrote:
    1300 - 1600 - 1750 - 11200 - 1480 - 19600

    Something is not right here (namely that 1 in front).
    If you ignore it, the correct values are: 300 - 600 - 750 - 1200 - 4800 - 9600
  • #12 21751613
    Anonymous
    Level 1  
  • #13 21751620
    inot
    Level 38  
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    I suggest installing this version of Arduino again, as something has gone wrong.
  • #14 21767639
    dawidkosciesza
    Level 11  
    Posts: 54
    Rate: 14
    inot wrote:
    fachman1964 wrote:
    1300 - 1600 - 1750 - 11200 - 1480 - 19600

    Something is not right here (namely that 1 in front).
    If you ignore it, the correct values are: 300 - 600 - 750 - 1200 - 4800 - 9600


    A colleague has made a good suggestion. I have the same problem and it turns out that you simply have to ignore the first digit in the speed setting in the port monitor. So for example for the speed "Serial.begin(115200)" we set 1115200 in the monitor and everything works ;)
    I don't know where such a write error comes from.
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  • #15 21769035
    fachman1964
    Level 5  
    Posts: 374
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    dawidkosciesza wrote:


    A colleague has made a good suggestion. I have the same problem and it turns out that you simply have to ignore the first digit in the speed setting in the port monitor. So for example for the speed "Serial.begin(115200)" we set 1115200 in the monitor and everything works ;)
    I don't know why such a write error.


    unfortunately setting 1115200 does not do anything i have bushes in the read.
  • #16 21769111
    dawidkosciesza
    Level 11  
    Posts: 54
    Rate: 14
    But "Serial.begin" are you set to 115200?
    I have "Serial.begin(115200)" and 1115200 in the monitor and it laughs without any problems on the ESP32 S3.
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FAQ

TL;DR: If your Arduino IDE 2.3.6 baud list shows odd values, it’s a UI glitch; the six corrected entries are 300–9600. “Something is not right here.” [Elektroda, inot, post #21751608]

Why it matters: Without the right baud, ESP32 serial output looks garbled and slows debugging for Windows 11 users.

Who this is for: ESP32 ESP‑WROOM‑32U users on Windows 11 and anyone asking “how do I fix missing 9600/115200 in Arduino IDE?”

Quick Facts

Why are 9600 and 115200 missing in Arduino IDE 2.3.6 on Windows 11?

A UI glitch can corrupt the baud dropdown, adding a leading “1” to entries. The corrected set includes 300–9600, so 9600 appears as 19600. This mismatch makes serial text unreadable. Treat the leading “1” as noise and select the mapped value until you fix the list. “Something is not right here.” [Elektroda, inot, post #21751608]

What do the strange baud values 1300, 1600, 1750, 11200, 1480, 19600 mean?

They are misrendered standards. Drop the leading “1” to map them: 1300→300, 1600→600, 1750→750, 11200→1200, 1480→4800, 19600→9600. Use the mapped value to test communications until you repair the environment. [Elektroda, inot, post #21751608]

How do I fix the missing baud rates quickly?

Reinstall Arduino IDE 2.3.6. Users reported the corrupted list disappears after a clean reinstall. “I suggest installing this version of Arduino again, as something has gone wrong.”
  1. Uninstall Arduino IDE 2.3.6.
  2. Reboot Windows 11.
  3. Reinstall Arduino IDE 2.3.6 and recheck Serial Monitor. [Elektroda, inot, post #21751620]

What baud should I try first if my ESP32 output is gibberish?

Start with 9600 baud and adjust if the text remains scrambled. Garbled output usually indicates a mismatch between the ESP32 sketch Serial.begin() and the Serial Monitor selection. [Elektroda, inot, post #21751567]

Is this issue device‑specific to ESP32 or an IDE problem?

It points to an IDE/environment problem. Another user with Arduino IDE 2.3.6 saw a normal list, which rules out an ESP32‑only fault. That suggests reinstalling or resetting IDE settings on the affected PC. [Elektroda, inot, post #21751581]

I see 12,000,000 baud in the list. Is that normal for ESP32?

That extremely high entry appears in the corrupted list. It is not a practical selection for typical Serial Monitor use and signals the dropdown is broken. Fix the environment before relying on those values. [Elektroda, fachman1964, post #21751589]

Does Arduino IDE 1.8.19 still work on Windows 7 for ESP32 projects?

Yes. Arduino IDE 1.8.19, and the whole 1.8.x line, remains Windows 7 compatible. “Arduino IDE 1.8.19 … is Windows 7 compatible.” ESP32 issues on old systems stem from the GCC/toolchain, not the OS Python. [Elektroda, khoam, post #21751613]

Is Python the reason ESP32 builds fail on old PCs?

No. The Arduino IDE bundles its own Python, so system Python is not the blocker. ESP32 core 3.x.x can struggle due to the GCC/toolchain on older systems. Update the toolchain or use IDE 1.8.19 on Windows 7. [Elektroda, khoam, post #21751613]

Could AI be wrong about this Arduino IDE baud list problem?

Forum experience shows the list can be wrong despite claims. One participant noted, “AI was right :D,” after confirming the screenshot and diagnosing a UI quirk. Validate with a reinstall and corrected mappings. [Elektroda, khoam, post #21751576]

How do I quickly map wrong entries to real speeds?

Use this guide: 1300→300, 1600→600, 1750→750, 11200→1200, 1480→4800, 19600→9600. This provides six working standards to test sketches without delays. Switch to a fixed environment afterward. [Elektroda, inot, post #21751608]

What’s an effective first troubleshooting step before reinstalling?

Open Serial Monitor, pick the corrected 9600 mapping (19600 in the broken list), and check if text becomes readable. If it does, the list is corrupt, not your code or board. [Elektroda, inot, post #21751567]

Why does matching the baud rate matter for debugging ESP32?

Serial communication requires identical baud settings on both ends. The corrected standards (300–9600) prove the list corruption, not a board fault. Mismatches yield scrambled output and slow debugging. Fix the list or reinstall to restore accurate choices. [Elektroda, inot, post #21751608]
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