Nodemcu / Introduction of NodemcuIt is a Single board microcontroller combined with WIFI access point. Or It is source IoT platform / open source software and hardware development board and which built on a System-on-a-Chip (SoC) called the ESP8266.Or It is a firmware that allows you to program the ESP8266 Wi-Fi SoC module from Espressif Systems, and hardware which is based on the ESP-12 module uses the Lua scripting language or Arduino IDE. NodeMCU board supports directly flashing from USB port (USB-TTL).  GPIO means General-purpose input/output is a pin on an Integrated Circuit (IC) can be either input pin or output pin, whose behavior can be controlled at the run time. The processor has around 16 GPIO lines and some are used internally to interface with other components of the SoC, like flash memory. GPIO pins allow connecting the board with other peripherals and are capable of generating PWM, I2C, SPI, and UART serial communications. GPIO pin can be used as digital inputs to read a digital voltage or digital outputs to output either 0V (sink current) or 3.3V (source current). |
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