Espressif ESP32-DevKitC-32E Development Board.

Used it for LED strings with WLED software program for Christmas light display.

Good price.

Got this to fork from my Arduino hobby into a board with embedded comms. Haven't tested Bluetooth yet but wifi works really well. So far it's everything I hoped for, have built several test projects and it nailed them. Long term, this board or another like it will power a system that monitors cycle time on a 240v mechanical system and uploads to a cloud DB with a grafana dashboard with out of compliance alerting. Good stuff.

Replaced a different one that I fried and works as intended.

I stumbled across a tutorial written several years ago by a guy in Germany who wanted to build a device that would report the humidity in several rooms in his basement through an Amazon Echo (Alexa) device. His tutorial didn't quite work for me, but it gave me a lot of good hints on how to start. I was able to build three devices that use this board and a DHT22 temperature and humidity sensor that will report temperature and humidity in different locations through an Alexa skill I wrote. Then I extended the skill and the code that runs on the ESP32 to add control of an AC solid state relay with a DC control input. The Mongoose-OS software made the ESP32 side easy. I wish I could say figuring out how to write the Alexa skill was as easy.