Support for the 32-bit ESP32 has also been implemented. Due to resource constraints, users need to select the modules relevant for their project and build a firmware tailored to their needs. It uses many open source projects, such as lua-cjson and SPIFFS. The firmware is based on the eLua project, and built on the Espressif Non-OS SDK for ESP8266. The firmware uses the Lua scripting language. īoth the firmware and prototyping board designs are open source. The term "NodeMCU" strictly speaking refers to the firmware rather than the associated development kits. The name "NodeMCU" combines " node" and "MCU" ( micro-controller unit). NodeMCU is an open source firmware for which open source prototyping board designs are available.
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