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esp-link/WEB-SERVER.md

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ESP-LINK web-server tutorial

Video

https://www.youtube.com/watch?v=vBESCO0UhYI

Installing el-client Arduino library

Download and install ELClient library.

https://github.com/jeelabs/el-client

LED flashing sample

Circuit:

  • 1: connect a Nodemcu (ESP8266) board and an Arduino Nano / UNO: (RX - levelshifter - TX, TX - levelshifter - RX)
  • 2: optionally connect RESET-s with a level shifter

Installation steps:

  • 1: open webserver_led ELClient sample file in Arduino
  • 2: upload the code onto an Arduino Nano/Uno
  • 3: open the Web Server page on esp-link UI
  • 4: upload LED.html from webserver_led ( ELCient/examples/webserver_led/LED.html )
  • 5: choose LED page on esp-link UI
  • 6: turn on/off the LED

HTML controls sample

Circuit:

  • 1: connect a Nodemcu (ESP8266) board and an Arduino Nano / UNO: (RX - levelshifter - TX, TX - levelshifter - RX)
  • 2: optionally connect RESET-s with a level shifter
  • 3: add a trimmer to A0 for voltage measurement

Installation steps:

  • 1: open webserver_controls ELClient sample file in Arduino
  • 2: upload the code onto an Arduino Nano/Uno
  • 3: open the Web Server page on esp-link UI
  • 4: upload the 3 HTML files from webserver_controls ( select multiple htmls from ELCient/examples/webserver_controls/ )
  • 5: jump to LED/User/Voltage pages
  • 6: try out different settings

Supported HTML controls

HTML control       Value Type Description Form Submission
<p id="id"/>
<div id="id"/>
<tr id="id"/>
<th id="id"/>
<td id="id"/>
<textarea id="id"/>		 String (HTML) MCU can replace the inner HTML part of the control at LOAD/REFRESH queries. The string (sent by MCU) is handled as HTML, so <img...> will be displayed as an image on the page NO
<button id="id"/> String When button is pressed, a message is transmitted to MCU containing the id (BUTTON_PRESS) NO
<input name="id"/> String
Integer
Float
Boolean		 MCU can replace the value or checked properties of the HTML control in the form (LOAD/REFRESH). At form submission, the content of value will be transmitted to MCU (SET_FIELD). YES
<select name="id"/> String MCU can choose a value from the drop down (LOAD/REFRESH). At form submission the currently selected value will be transmitted to MCU (SET_FIELD) YES
<ul id="id"/>
<ol id="id"/>		 JSON list
["1","2","3"]		 MCU can send a JSON list which is transformed to an HTML list ( <li/> ) (LOAD/REFRESH) NO
<table id="id"/> JSON table
[["1","2"],
["3","4"]]		 MCU sends a JSON table which is transformed to an HTML table (LOAD/REFRESH) NO