# ESP32S3 n16r8, no print on monitor **URL:** \ **Category:** 3rd Party Boards\ **Created:** [November 24, 2025, 5:31pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145 "2025-11-24T17:31:50Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![patsjemoe](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/patsjemoe/32/1098735_2.png) [@patsjemoe](https://forum.arduino.cc/u/patsjemoe)\ **Post date:** [November 24, 2025, 5:31pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/1 "2025-11-24T17:31:50Z")
Esp32s3 is booting, but it seems not to excecute the program, or no prints are sent. I tested 2 units , but cannot get it to work. Cdc flag is set, use the com port. Is there a suggested settings file somewhere ? The device is esp32s3-wroom 1, and use arduino 3.2.6 Thanks for any suggestion Regards Ludo ---
**Author:** ![kmin](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/kmin/32/1147370_2.png) [@kmin](https://forum.arduino.cc/u/kmin)\ **Post date:** [November 24, 2025, 5:58pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/2 "2025-11-24T17:58:59Z")
> [@patsjemoe](#): > > but it seems not to excecute the program, or no prints are sent Two different things. If you upload Blink, does it execute? ---
**Author:** ![srnet](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/srnet/32/238868_2.png) [@srnet](https://forum.arduino.cc/u/srnet)\ **Post date:** [November 24, 2025, 7:07pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/3 "2025-11-24T19:07:02Z")
> [@patsjemoe](#): > > esp32s3-wroom 1 That sounds like the basic ESP32S3 module, but to use it its normally mounted on a board with a heap of other components. So which actual ESP32S3 board are you using ? Some ESP32S3 boards have two USB connections, do you have one of them ? Good idea to post a link to the actual board you are using, less confusion ………………… ---
**Author:** ![BitSeeker](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/bitseeker/32/1241632_2.png) [@BitSeeker](https://forum.arduino.cc/u/BitSeeker)\ **Post date:** [November 24, 2025, 7:08pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/4 "2025-11-24T19:08:21Z")
Which port on the ESP32S3 Devkit board are you connecting your USB cable to? > [@patsjemoe](#): > > Cdc flag is set, use the com port. I presume by this you mean `Tools -> Use CDC On Boot: Enabled` ? ---
**Author:** ![patsjemoe](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/patsjemoe/32/1098735_2.png) [@patsjemoe](https://forum.arduino.cc/u/patsjemoe)\ **Post date:** [November 24, 2025, 7:30pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/5 "2025-11-24T19:30:31Z")
Yes of course, and use com port, not the usb one. ---
**Author:** ![patsjemoe](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/patsjemoe/32/1098735_2.png) [@patsjemoe](https://forum.arduino.cc/u/patsjemoe)\ **Post date:** [November 24, 2025, 7:33pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/6 "2025-11-24T19:33:33Z")
It is the module using esp32s3 wroom1, N16R8, with 2 usb-c connectors com and usb, I use com port ---
**Author:** ![patsjemoe](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/patsjemoe/32/1098735_2.png) [@patsjemoe](https://forum.arduino.cc/u/patsjemoe)\ **Post date:** [November 27, 2025, 3:16pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/7 "2025-11-27T15:16:47Z")
despite I read on the internet that cdc needs to be enabled at boot, I had to disable it and now it works ---
**Author:** ![srnet](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/srnet/32/238868_2.png) [@srnet](https://forum.arduino.cc/u/srnet)\ **Post date:** [November 27, 2025, 3:37pm UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/8 "2025-11-27T15:37:09Z")
> [@patsjemoe](#): > > despite I read on the internet that cdc needs to be enabled at boot, It needs to be enabled if your uploading via the native USB port and disabled if your using the Serial com port. At least that’s the case for my ESP32S3 development boards. ---
**Author:** ![deepak404](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/deepak404/32/1271476_2.png) [@deepak404](https://forum.arduino.cc/u/deepak404)\ **Post date:** [May 15, 2026, 7:31am UTC](https://forum.arduino.cc/t/esp32s3-n16r8-no-print-on-monitor/1416145/9 "2026-05-15T07:31:37Z")
I have same esp32 SE n16r8 code uploaded successful but in serial monitoring issue ESP-ROM:esp32s3-20210327 Build:Mar 27 2021 rst:0x1 (POWERON),boot:0x0 (DOWNLOAD(USB/UART0)) waiting for download