Got my ESP-WROOM-32 installed all the stuff including …. json thingy,  opened WiFiScan sketch, compiles fine no upload.  No WROOM board in the list, lots of others like ESP DOIT etc and LOLIN etc. tried em all, no progress.  The WROOM I have is 38pin no other markings on board … I’m stuffed again .. thought this would be easy … :- ((  ideas?

Hello Michael, thank you for posting the question.

• What do you mean it doesn’t compile? what’s the error that you see printed in the Arduino IDE window?
• Did you select the COM Port of your ESP32 in Tools > Board?

Thanks!

Day 2.  Re started course followed instructions diligently up to WiFi Scan … compiled first fine but DID NOT upload .  Port chosen correctly and board defined as ESP32 Dev Module.
Error message “invalid head of packet 0x0D”

Resolved after trawling the internet …. a method to get ESP-WROOM-32 to upload to ESP32 Dev Module.  Solved at last.
Michael

What did you have to change to make it work? I’m glad it’s working now.
According to your error message, you need to hold down the BOOT button to put your board in flashing mode.
I cover that exact error in the ESP32 Troubleshooting Guide section 4.: https://rntlab.com/module-1/esp32-troubleshooting-guide/
Thanks for your time!

I did exactly as you have said BOOT button at upload.  I wasted 1/2 a day discovering this only to now find the solution further into the course.  Better on page with selection of boards.  Either way I have now progressed beyond Module #3 Deep Sleep. All is good.
Michael

Rui What is your location?  Brasil,  USA??

I’m sorry about that.. But I’m glad you were able to figure it out.
I’m from Porto, Portugal 🙂