내가 산 거

- https://www.aliexpress.com/item/V3-Wireless-module-NodeMcu-4M-bytes-Lua-WIFI-Internet-of-Things-development-board-based-ESP8266-for/32554198757.html?spm=2114.13010608.0.0.c71jFb

- CH340 NodeMcu v3 (1.0)

https://iotbytes.wordpress.com/nodemcu-pinout/

Features

• Wireless 802.11 b / g / n standard
• Support STA / AP / STA + AP three operating modes
• Built-in TCP / IP protocol stack to support multiple TCP Client connections (5 MAX)
• D0 ~ D8, SD1 ~ SD3: used as GPIO, PWM, IIC, etc., port driver capability 15mA
• AD0: 1 channel ADC
• Power input: 4.5V ~ 9V (10VMAX), USB-powered
• Current: continuous transmission: ≈70mA (200mA MAX), Standby: <200uA
• Transfer rate: 110-460800bps
• Support UART / GPIO data communication interface
• Remote firmware upgrade (OTA)
• Support Smart Link Smart Networking
• Working temperature: -40 ℃ ~ + 125 ℃
• Drive Type: Dual high-power H-bridge driver