Espressif has a new ESP32, the ESP32-S31, and that ESP32 comes with a gigabit Ethernet MAC, a USB 2.0 High-Speed host controller, an SD card interface with two slots, and a camera input. It's a pretty standard set of features for a Linux single-board computer, but a rather strange list of things to find on a microcontroller. I've spent a lot of time with microcontrollers, and it's typical to find a couple of cores, a small amount of RAM, GPIO pins, and maybe Wi-Fi on one. Something mo...