This one is based on the ESP-M2 module produced by DOIT. It's a ESP-8285 Wi-Fi MCU with a small amount of flash and fewer I/Os than the ESP-8266. It's Arduino and NodeMCU compatible. The board is the minimum system breakout PCB with an added RGB LED (I haven't tried to control it yet though), a reset switch and another one to enter program mode. Quite incredible for the price. Board solder quality is top. Note: it uses the CH340C chip for USB to serial communication. Make sure to install the correct drivers but beware there are installers floating around that are infected with virus/trojans! Know your source!

This one is based on the ESP-M2 module produced by DOIT. It's a ESP-8285 Wi-Fi MCU with a small amount of flash and fewer I/Os than the ESP-8266. It's Arduino and NodeMCU compatible. The board is the minimum system breakout PCB with an added RGB LED (I haven't tried to control it yet though), a reset switch and another one to enter program mode. Quite incredible for the price. Board solder quality is top. Note: it uses the CH340C chip for USB to serial communication. Make sure to install the correct drivers but beware there are installers floating around that are infected with virus/trojans! Know your source!

This one is based on the ESP-M2 module produced by DOIT. It's a ESP-8285 Wi-Fi MCU with a small amount of flash and fewer I/Os than the ESP-8266. It's Arduino and NodeMCU compatible. The board is the minimum system breakout PCB with an added RGB LED (I haven't tried to control it yet though), a reset switch and another one to enter program mode. Quite incredible for the price. Board solder quality is top. Note: it uses the CH340C chip for USB to serial communication. Make sure to install the correct drivers but beware there are installers floating around that are infected with virus/trojans! Know your source!

Excellent

Excellent

Excellent