NodeMCU onboard ESP-12F ( 4MB Flash) WIFI module and USB to TTL serial port CP2102 chip, it is convenient to download firmware and debug. The NodeMCU defaults to Lua firmware. If you need to use AT command, please download new AT firmware. The development board core processor ESP8266 integrates the industry's leading ultra-low power 32-bit micro MCU in a smaller size package, with 16-bit reduced mode, main frequency support 80MHz and 160 MHz, support RTOS, integrated Wi-Fi MAC/ BB/RF/PA/L NA, on-board antenna. Supports standard IEEE802.11b/g/n protocol and complete TCP/IP protocol stack. Users can use this module to add networking functions to existing devices, or they can build independent network controllers. ESP8266 is a high-performance wireless SOC, which provides great practicability at low cost and unlimited possibilities for WiFi functions to be embedded in other systems.