WARNING: Category ‘Sound’ in library ESP_SR is not valid. Setting to ‘Uncategorized’
WARNING: Category ‘Security’ in library Hash is not valid. Setting to ‘Uncategorized’
WARNING: Category ” in library ESP Insights is not valid. Setting to ‘Uncategorized’
WARNING: Category ” in library ESP RainMaker is not valid. Setting to ‘Uncategorized’
WARNING: Category ” in library TFLite Micro is not valid. Setting to ‘Uncategorized’
WARNING: Category ” in library WiFiProv is not valid. Setting to ‘Uncategorized’
Sketch uses 281151 bytes (8%) of program storage space. Maximum is 3145728 bytes.
Global variables use 20852 bytes (6%) of dynamic memory, leaving 306828 bytes for local variables. Maximum is 327680 bytes.
esptool v5.1.0
Serial port /dev/ttyUSB0:
Connecting……………………………….
A fatal error occurred: Failed to connect to ESP32: No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html
the selected serial port For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html
does not exist or your board is not connected
.
i face this issue when i upload the code

Hi.
You can get one board with an MB programmer, and then, after uploading the code, connect the ultrasonic sensor, and another power source.
But, in your case, it will be easier to use an FTDI programmer.
See your options here: https://randomnerdtutorials.com/program-upload-code-esp32-cam/

Regards,
Sara

Here’s my use case: I need to upload code to the ESP32 and also connect an ultrasonic sensor to it. The issue is that the ESP32-CAM AI-Thinker uses almost all the pins when connected to the MB shield, which might limit the use of the sensor. Since I’m a beginner in this area, I’m not sure which option would be the best choice.

Hi.
What code are you trying to run?
Which ESP32 core version do you have installed in your Arduino IDE? Go to Tools > Boards > Boards Manager > ESP32 and check the version.
Regards,
Sara

If I had any other board selected, say ‘ESP32 Dev Module’, selected, the sketch would compile and upload fine, but after RTS pin reset, nothing happens. Even pressing the RST button on the MB daughter board did not work unless the ‘AI Thinker ESP32-CAM’ board was selected at sketch upload to the board I have.

You also have to make sure the board_config.h file is updated for correct camera that you may have, for example ‘CAMERA_MODEL_ESP32_CAM_BOARD’.

However, I still am getting errors…
E (72) i2c.master: I2C hardware timeout detected
E (72) i2c.master: probe device timeout. Please check if xfer_timeout_ms and pull-ups are correctly set up

No clue why this is happening, not sure that is trying to use the i2c bus.

I contacted the seller, asking for code example that works… nothing but crickets.

Your advice is very useful. Thanks a lot!

Hi
Thanks for providing that information.
It will definitely be useful for our readers.
Regards,
Sara

I found the following on tinytronics.nl/en/development-boards/accessories/adapter-boards/esp32-cam-mb-programmer-shield

Note: The RST button on this shield does not work. To put the ESP32-CAM in boot mode for programming, the following two options are therefore possible:
1. While connecting the shield to the PC (with the ESP32-CAM already installed), press and hold the IO0 button. After connecting the IO0 button can be released and the code can be uploaded.
2. While the shield (with the ESP32-CAM installed) is connected to the PC, press and hold the IO0 button and then briefly press the RST button on the ESP32-CAM. Then the IO0 button can be released and the code can be uploaded.