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What is the library I should use to upload the sensor data (ultrasonic and Infrared sensor) to the localhost server.

Because I saw some of the online resources using ESP8266WiFi.h library for the ESP01 and some of resources use the softwareserial.h library. So, what is the difference between these two libraries?

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  • one uses wifi ... the other is to create a second, software driven serial port - which is basically useless on an ESP01 because it has like 2 gpio's – Jaromanda X Dec 14 '18 at 8:12
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The SoftwareSerial is used to communicate with the esp8266 from other MCU. The ESP8266WiFi library is for Arduino sketch running in esp8266.

The esp8266 can be used with firmware as 'network adapter' for your sketch running for example in Arduino Uno. MCU in Uno has only one hardware Serial which is used to communicate with the computer over USB (to upload and use Serial Monitor). To communicate with the esp8266 usually a second Serial interface is created with SoftwareSerial.

But esp8266 can be used as Arduino board with "esp8266 Arduino core". This 'core' contains Arduino libraries to access the WiFi functions of the esp8266 from a sketch running in esp8266.

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