A feature-rich MCU with integrated Wi-Fi and Bluetooth connectivity for a wide-range of applications.

The ESP32 is essentially a more powerful version of the ESP32-C3 (except for Bluetooth). It features a dual-core CPU instead of single-core, with more RAM and ROM. One major downside for me at least is that it uses the Xtensa architecture instead of ARM or RISC-V. Since LLVM doesn't have Xtensa support yet, and Rust depends on LLVM, I can't use Rust for programming the ESP32 as easily as the ESP32-C3. There are however forks of LLVM with Xtensa support, and it seems like Xtensa support will come soon.

It seems like a new Xtensa backend has been merged upstream to LLVM on master. According to this article, LLVM 16 will include this Xtensa backend that Espressif has been working on for several years. This is great news, since it seems like ESP32 is better than ESP32-C3 in basically everything except for Bluetooth. Two cores is definitely better than one.

Nevertheless, this is also a great microcontroller that's very cheap. On AliExpress it costs 3.54 USD each. With shipping it's probably around 4-5 USD.