2pcs ESP32-DevKitC core Board ESP32 Development Board ESP32-32U WiFi Bluetooth Development Board for Arduino IDE (32U)

Nice boards! They flash without having to press the flash button, which is nice. I've been using it's bluetooth with an external antenna as a beacon and I'm getting about twice the range I was with another ESP32 board with an onboard antenna. One note though: it doesn't appear to have an internal (onboard) antenna, so I think you'll need an external antenna to get a decent signal with wifi or bluetooth. I've used other boards in the past that had the option of using onboard or external, this one appears to be only external.

For a tiny bit more money, you get these chips instead of an arduino. It's amazing how responsive and we'll these work. I use them for everything and they are dirt cheap but also high quality!

you have to add an antenna to use these but I got my bluetooth proxy working in no time using these

First works well. You do have to hold the boot button until the program starts uploading, but expected for this model. I needed the external antenna because it is located far from the house. The second is a little wonky. I thought it was dead, but turns out you have to hold the reset button, then hold the boot button, then release the reset button! Once uploaded, it will not start unless you once again press the reset button. That, and a few unexpected restarts, and I'll probably not use this on critical things, just for debugging program I suppose.

Good value for simple mcus. This kit has no antennas, u.Fl connectors are populated however. My boards had flux all over from assembly and needed cleaning. Some components were poorly soldered. Everything else about the fab and assembly seems good.

if you play with electronics you know the smell of burning chips. one seemed to work the other burned up like a piece of space junk headed back to earth.

One of the boards stopped working after about a week.