For the ESP32, it sounds like it might be doing the same thing when the serial monitor is closed. Just like any Arduino connected to the Arduino IDE's, the Arduino resets when you initialize the serial monitor. I am not sure what ESP32 development board was used in the issue reported.ĮSP32 Resetting when Serial Monitor Closed Based on previous experience with the esp-type IC's, it's possible that there is something in the ESP32 Arduino Core's board add-on files preventing the ESP32 from automatically resetting when DTR toggles the pin.įrom what I can see in the ESP32 repository's issues, people that had similar errors were able to upload when GPIO0 was held low (i.e. Looking into the Eagle files, it looks like he might have already considered using the DTR from the FTDI to reset the ESP32 to upload. Doing a test on Arduino IDE v1.6.5 and v1.6.11, I was not able to upload code unless I hold the button down when the IDE was uploading code.

, try holding the pin 0 LOW by pressing down on the button. If you see this error when uploading: esptool.py v2.0-devĪ fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header You can also follow the directions from our tutorial, just make sure that all the files are installed correctly.

I was able to compile and upload to the board once it was installed correctly. Make sure that you install the ESP32 Arduino core definitions correctly or you might see this error: exec: 'C:\Users\.\Documents\Arduino\hardware\espressif\esp32/tools/xtensa-esp32-elf/bin/xtensa-esp32-elf-g++': file does not existĮrror compiling for board ESP32 Dev Module.Īfter going through the installation 4 times from these directions because the Xtensa and ESP32 Tools were not in the correct folder. Installing the board definitions of the ESP32 is not as trivial as using the Arduino board manager. Tech Support Tips/Troubleshooting/Common Issues.

Sparkfun esp32 fritzing