JAMES RYBAK asked 6 years ago
Sometimes an ESP32 board refuses to connect to the Arduino IDE for uploading a sketch when using Windows. When that happens, there are two things you can do.
- Hold down the “Boot” button on the ESP32 board while uploading the sketch. OR
- Place a ~.2 uf capacitor between the RST and GND pins on the Arduino (suggested by Adafruit)
One or the other of these suggestions usually works. The first one works like a charm for me using Windows 7.
Rui Santos Staff answered 6 years ago
Thank you James! Yes, in some cases the boards or the Arduino IDE is not automatically going to flashing/uploading mode and you have to fold down the BOOT button. I’ll be adding those instructions to the course in the next update.
Thanks!
Lance Benson answered 6 years ago
Thanks for this solution. On my NodeMCU 32S dev board, after clicking “Upload”, I wait until the compilation completes, and then when the console says “Connecting …”, I press the “Boot” button for a few seconds and then release. Works for me.
Rui Santos Staff answered 6 years ago
Exactly Lance! Thanks for the suggestion and I’ve added your procedure to the troubleshooting guide (issue #4): https://rntlab.com/esp32-troubleshooting-guide/
I even recommend holding the “BOOT” button before pressing the “Upload” button just to be sure that it forces the ESP32 into flashing mode.
Regards,
Rui