![]() GPIO1 and GPIO3 are tx and rx pins respectively used for UART communication.ĭ1 and D2 can be used SCL and SDA for I2C communication. Pins from D0-D8 can be used as GPIO pins. It also has SDK for customized development/cloud server development.It supports firmware upgrades via UART download/ OTA (via network).It comes in a QFN 32-pin ( 5mm * 5mm) package.It operates on 2.5-3.6V and average 80mA current with temperatures ranging from -40 to 125 C.It also has UART, SDIO, SPI, I2C, I2S, and IR remote control peripheral interface.This GPIO can be used to interface nodeMCU with the external environment through sensors and actuators. It has 17 GPIO, 11 are usable( 6 are used for communication with the onboard flash memory chip) and some of them support PWM.It has 2.4GHz 802.11b/g/n Wi-fi with on-board antenna which supports WPA/WPA2.The onboard ESP8266 chip manufactured by Espressif Systems has an ESP8266EX core Wi-Fi SoC and a Tensilica L106 32-bit processor in the same chip.Let’s look at the specification and construction of this module which makes it superior to its counterparts. Since it can be connected to Internet it can be used in wide variety of applications like smart house,smart industrial devices, smart healthcare devices,etc. But again this board is wide making it difficult to use. 3rd generation board V3 is produced by LoLin which has minor improvements over the V2 board and is believed to have a more robust USB port than its predecessor(CH340G USB-TTL chip is used instead of Silabs CP2102 from V1.0). ![]() ![]() Also, the chip in this board is upgraded i.e. This board is more narrow and easy to fit on the breadboard. This limitation is overcome by its next generation i.e 2nd generation or v1.0 or V2 board. It is very wide and not convenient to use on a breadboard. ![]() The v0.9 board is also called as 1st generation or V1 board. ![]()
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