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About NodeMCU: NodeMCU is an open source networking platform. It is programmed by using the Lua scripting language. The platform is based on eLua open source projects. Overviews: - NodeMCU-32S is based on the ESP-32S module. The platform uses a lot of open source projects£¬ such as lua-cjson£¬ spiffs. - NodeMCU-32S contains firmware that can run on ESP32 Wi-Fi SoC chips£¬ and hardware based on ESP-32S modules. ESP32 is the WiFi + Bluetooth chip developed by Shanghai Espressif£¬ which aims to provide access network for embedded products. - NodeMCU-32S is the core development board based on ESP-32S module. The development board continues the NodeMCU 1.0 classic design£¬ leads to most of the I / O to the two sides of the pin£¬ the developer can connect to the peripherals according to their own needs. When using the breadboard for development and commissioning£¬ both sides of the standard pin can make the operation more simple and convenient. Features: Open source£¬ interactive£¬ programmable£¬ simple & intelligent£¬ WIFI + Bluetooth hardwarePowerful operating hardware IO as arduinoUsing Nodejs similar syntax to write network applications Ultra-low cost WIFI module Size: Schematic diagram: