3PCS ESP32 ESP-32S ESP-WROOM-32 Development Board Kits, 38 Pin CP2012 USB C WiFi + Bluetooth Dual Cores Microcontroller Processor Compatible with Arduino IDE NodeMCU

Used mine to connect my phone using BLE and speak to an arduino mega. Works perfect. If looking for the same idea, you’ll need a leveler to help with the power conversion.

Very versatile devices. I think I'll order another with a screen.

Es lo que esperaba para realizar un proyecto de monitoreo de calidad de aire mediante el uso de IoT.

2 of these work. The third is DOA. You plug in the USB cable and it draws too much power. One Anker charger tripped its internal circuit and shut down, the computer complains of USB overvoltage protection and a laptop charger turned itself off. The other 2 are fine.

Through what I can only assume to be gross incompetence and a complete lack of any actual QC done on these, my entire 3-pack was assembled incorrectly, with none of the silkscreening matching and none of the pins where they should be, according to manufacturer diagrams. They probably assembled it upside down, given what pins actually have voltage, but I'm not even going to waste my time trying to sort that out.

Works, but to install the code, you must hold the boot button.

Great little board. Using it for signal generation on the built in DAC and it worked well. Never left me guessing. Consistent loading of sketches!

I had no real issues with these boards. I was able to load code onto them, and they functioned exactly as expected. I treated them as a NodeMCU-32S board, as the description mentioned. Unfortunately, they do not automatically identify themselves like other boards do, which is why I knocked off a star. Aside from that, I had no troubles using them with the Arduino IDE. These are very inexpensive, though, and having to manually select their type isn't a huge hassle, even for a noob such as myself. That aside, I have zero complaints.