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PinModes ESP8266 NodeMCU

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<b>Specifications of ESP8266</b></h2>
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Esp8266 specification divides into three
 parts: Hardware, Software, and Wi-Fi. In hardware specification, its 
package size is QFN 32pins with a dimension of 5mm x 5mm. Operating 
voltages range from 2.5V to 3.6V. The chip consumes 80mA of current on 
average. Its CPU is Tensilica L106 which is a 32bit processor with 
on-chip SRAM. The peripheral interface contains UART, SDIO, SPI, I2C, 
I2S, IR remote control, GIPO’s, ADC, PWM, LED Light and button.</div>
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Its firmware can be updated using OTA 
and UART. It uses IPv4, TCP, UDP, and HTTP as network protocols. User 
can configure using AT commands set, Cloud Server and using a mobile 
application.</div>
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Wi-Fi frequency ranges from 2.4G to 
2.5G. It uses standard Wi-Fi protocol IEEE 802.11 b/g/n. Esp6266 Wi-Fi 
capabilities are certified by Wi-Fi Alliance.</div>
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