I started mucking about with ESPHome yesterday and setup a WROOM with an AHT22 temp/humidity sensor. Running the wizard and adding the configs is easy-peasy. I started to have issues as soon as I wanted to flash.
- If the AHT22 is plugged in, I cannot flash the device over USB.
- I can check the serial logs once the device is flashed and then plug in the AHT22 once the device is booted and get readings, but
- Once I unplug the ESP32 from the serial port and plug it into a power supply, I got nothing. No network activity at all.
- Unplug the AHT22, plug into the power source, wait a few seconds, plug in the AHT22 has seemed to work correctly this morning and HA is pulling data but I tried that last night a few times and it didn’t work – so unsure why it’s working this morning other than strange timing when I’m plugging the thing back in.
I am using the basic esp32dev firmware, which I am assuming works because it DOES work, eventually, but I’m not confident I’m using the right base but I cannot figure out which one to use.
Make sure you’re not using any of the strapping pins for the interface with the AHT22 - take a look at https://esp32.com/viewtopic.php?t=5970 for a read. It basically means leaving GPIOs 12, 0, 2, 4, 15, 5 floating during boot or the esp will not boot correctly.
These pins control the boot process (like going to the boot loader instead of your code).
Patched, flashed, and didn’t crash! That also explains why WLED project switched to pin 18 or whatever by default. This is a huge fix and I really appreciate it!
I think you nailed it. It explains both the issues flashing and booting. I’ll have to muck about with other pins and see if that fixes it.