An ESP32 based D1 Mini form factor board for upgrading ESP8266 based projects. No USB onboard, I instead opted for a sonoff style serial header. A couple of caveats: Just like the original D1 Mini boards, there is no room to have everything on one side -- this board has SMT components on both sides. Thus, for JLC economic PCB assembly, only the bottom will be factory soldered, so I solder in the WROOM32 module myself. This isn't so bad, that means I can choose internal or external antenna (WROOM32 or WROOM32U) based on my needs, for each board. ESP-12E and ESP-12F both have built in LEDs. WROOM32 modules have no LED, so we have to put it on the board. Since the LED needs to be visible means it needs to be on the same side as the ESP32 module, so we have to solder the LEDs in ourselves as well. The side actuated reset switch is an extended part, no way around it. Everything else on the bottom side are basic parts.