ESP-LINK web-server tutorial
============================
Video
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https://www.youtube.com/watch?v=vBESCO0UhYI
Installing el-client Arduino library
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Download and install ELClient library.
https://github.com/jeelabs/el-client
LED flashing sample
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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
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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 |