Comments on: ESP32 PWM with Arduino IDE (Analog Output)

By: mozammel

mozammel — Wed, 25 Jun 2025 22:53:41 +0000

Hi, Sara. Thanks for this informative tutorial. I would like to know if I can utilize this PWM with LEDC API to generate a clock pulse with frequency as high as 64 MHz. The Table 28.2-1. Commonly-used Frequencies and Resolutions in this link (www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#ledpwm) gives PWM frequency in KHz. Does that mean that there is no way I will be able to achieve a frequency in MHz, let alone a clock pulse? Please let me know your opinion on my requirement said above. Thanks in advance.

By: Sara Santos

Sara Santos — Sun, 01 Jun 2025 10:10:48 +0000

In reply to alex.

Hi.
Update your ESP32 boards to version 3.
Go to Tools > Boards > Boards Manager > Search for ESP32, and update to version 3.
Regards,
Sara

By: alex

alex — Fri, 30 May 2025 10:29:14 +0000

PLEASE HELP ME
Error :

C:\Users\intel\Downloads\xe_tranh_vat_can_Arduino\xe_tranh_vat_can_Arduino.ino: In function ‘void setup()’:
C:\Users\intel\Downloads\xe_tranh_vat_can_Arduino\xe_tranh_vat_can_Arduino.ino:17:3: error: ‘ledcAttach’ was not declared in this scope
ledcAttach(ledPin, freq, resolution);
^~~~~~~~~~
C:\Users\intel\Downloads\xe_tranh_vat_can_Arduino\xe_tranh_vat_can_Arduino.ino:17:3: note: suggested alternative: ‘ledcAttachPin’
ledcAttach(ledPin, freq, resolution);
^~~~~~~~~~
ledcAttachPin
exit status 1

Compilation error: ‘ledcAttach’ was not declared in this scope

By: SébaSAUV

SébaSAUV — Sun, 02 Feb 2025 01:07:11 +0000

it is necessary to select 16-bit resolution

By: SébaSAUV

SébaSAUV — Sun, 02 Feb 2025 00:12:14 +0000

Hello everyone,
I’m trying to generate a 1Hz PWM signal with a 97.5% duty cycle. I can’t do it with these functions. Do you have any ideas, please?

By: Sara Santos

Sara Santos — Thu, 28 Nov 2024 10:47:25 +0000

In reply to Rick.

That’s great.
I’m glad it’s working now.
Regards,
Sara

By: Rick

Rick — Thu, 28 Nov 2024 01:55:27 +0000

Hi Sara,
Thanks for a quick response. I followed your suggestion and it worked no compiling or issues whatsoever.
Now my project is incorporating the PS3 controller to this Tutorial.
Thanks again
Rick

By: Sara Santos

Sara Santos — Wed, 27 Nov 2024 11:02:20 +0000

In reply to Ricardo.

Hi.
It seems you already have the latest version.
Uninstall the Arduino ESP32 Boards 2.0.18 and the one by Ricardo Quesada. You only need the one by expressif.
Additionally, make sure that you have an ESP32 board selected in Tools > Board when trying to compile an ESP32 code.

Regards,
Sara

By: Ricardo

Ricardo — Tue, 26 Nov 2024 23:49:14 +0000

Hi Sara,
Thanks for a quick response. I just want to clarify the ESP32 boards you said I’m using version 2. How do I update to version 3. Currently my ESP32 boards on my library installed is Arduino ESP32 Boards 2.0.18 and ESP32 by Expressif Systems is version 3.07 both installed.
Where do I get the version 3 of ESP32 boards you’re suggesting. Sorry I’m just new to this libraries.
I got this information from my Arduino IDE by typing on my boards manager ESP32 and it populates my boards to 3 boards. Two I mentioned above and the 3rd one is esp32_bluepad32 by Ricardo Quesada.
Thanks
Rick

By: Sara Santos

Sara Santos — Tue, 26 Nov 2024 14:45:36 +0000

In reply to Rick Balazo.

Hi.
Please update your ESP32 boards installation to version 3.
The PWM methods have changed. You must still be running ESP32 version 2.
Let me know if you can solve the issue.
Regards,
Sara