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251 lines
9.7 KiB
Markdown
251 lines
9.7 KiB
Markdown
# ESPUI
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ESPUI is a simple library to make a web user interface for your projects using
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the **ESP8266** or the **ESP32** It uses web sockets and lets you create,
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control, and update elements on your GUI through multiple devices like phones
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and tablets.
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ESPUI uses simple Arduino-style syntax for creating a solid, functioning user
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interface without too much boilerplate code.
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So if you either don't know how or just don't want to waste time: this is your
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simple solution user interface without the need of internet connectivity or any
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additional servers.
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I completely rewrote the EasyUI Library created by ayushsharma82
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[Here](https://github.com/ayushsharma82/) Now it uses ESPAsyncWebserver and is
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mainly to be used with the ESP32 Processor.
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# Important notes
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Currently ESPUI only supports ArduinoJSON 5.x, please keep that in mind! Version
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6 support is work in progress
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## Dependencies
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This library is dependent on the following libraries to function properly.
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- [ESPAsyncWebserver](https://github.com/me-no-dev/ESPAsyncWebServer)
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- [ArduinoJson](https://github.com/bblanchon/ArduinoJson) **(VERSIONS 5.x only
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currently)**
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**Plus for ESP8266**
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- [ESPAsyncTCP](https://github.com/me-no-dev/ESPAsyncTCP)
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**Additionally necessary for ESP32**
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- [AsyncTCP](https://github.com/me-no-dev/AsyncTCP)
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## How to Install
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Make sure all the dependencies are installed, then install like so:
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#### Directly Through Arduino IDE (_recommended_)
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You can find this Library in the Arduino IDE library manager Go to Sketch >
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Include Library > Library Manager > Search for "ESPUI" > Install
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#### Manual Install
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For Windows: Download the
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[Repository](https://github.com/s00500/ESPUI/archive/master.zip) and extract the
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.zip in Documents>Arduino>Libraries>{Place "ESPUI" folder Here}
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For Linux: Download the
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[Repository](https://github.com/s00500/ESPUI/archive/master.zip) and extract the
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.zip in Sketchbook/Libraries/{Place "ESPUI" folder Here}
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For macOs: Download the
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[Repository](https://github.com/s00500/ESPUI/archive/master.zip) and extract the
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.zip in ~/Documents/Arduino/libraries/{Place "ESPUI" folder Here}
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#### Manually through IDE
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Download the [Repository](https://github.com/s00500/ESPUI/archive/master.zip),
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Go to Sketch>Include Library>Add .zip Library> Select the Downloaded .zip File.
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## Getting started
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ESPUI serves several files to the browser to build up its webinterface. This can
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be achieved in 2 ways: _PROGMEM_ or _SPIFFS_
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_When `ESPUI.begin()` is called the default is serving files from Memory and
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ESPUI should work out of the box!_
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But if this causes your program to _use too much memory_ you can burn the files
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into the SPIFFS filesystem on the ESP. There are now two ways to do this: you
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can either use the ESP file upload tool or you use the library function
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`ESPUI.prepareFileSystem()`
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#### Simple filesystem preparation (_recommended_)
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Just open the example sketch **prepareFileSystem** and run it on the ESP, (give
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it up to 30 seconds, you can see the status on the Serial Monitor), The library
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will create all needed files. Congratulations, you are done, from now on you
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just need to to this again when there is a library update, or when you want to
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use another chip :-) Now you can upload your normal sketch, when you do not call
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the `ESPUI.prepareFileSystem()` function the compiler will strip out all the
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unnecessary that is already saved in the chip's filesystem and you have more
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programm memory to work with.
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#### Manual way (mainly for development)
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To do this download and install me-no-devs wonderful
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[ESP32 sketch data uploader](https://github.com/me-no-dev/arduino-esp32fs-plugin)
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or for ESP8266
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[ESP8266 sketch data uploader](https://github.com/esp8266/arduino-esp8266fs-plugin)
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Then open the **gui** example sketch and select "Upload Sketch Data" from the
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Tools menu for your processor. Now you are set to go and use any code you want
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to with this library
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## User interface Elements
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- Label (updateable)
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- Button
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- Switch (updateable)
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- Control pad
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- Control pad with center button
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- Slider
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- Text Input (updateable)
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- Numberinput (updateable)
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Checkout the example for the usage
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## Available colors:
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- COLOR_TURQUOISE
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- COLOR_EMERALD
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- COLOR_PETERRIVER
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- COLOR_WETASPHALT
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- COLOR_SUNFLOWER
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- COLOR_CARROT
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- COLOR_ALIZARIN
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- COLOR_NONE
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## Roadmap :
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- ~~Setup SPIFFS using values in program memory~~
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- ~~ESP8266 support~~
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- ~~PlattformIO Integration~~
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- ~~Multiline Labels~~
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- ~~GZip Files and serve from memory~~
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- Datagraph output -> _WIP_
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- ~~Number input ~~
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- ~~Text input ~~
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- Dokumentation for Text and number widget
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- Number min and max value
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- proper return value (as int and not as string) for slider
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- Maybe a slider range setting, meanwhile please use _map()_
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## Documentation
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The heart of ESPUI is
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[ESPAsyncWebserver](https://github.com/me-no-dev/ESPAsyncWebServer). ESPUI's
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frontend is based on [Skeleton CSS](http://getskeleton.com/) and jQuery-like
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lightweight [zepto.js](https://zeptojs.com/) for Handling Click Events Etc. The
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communication between the _ESP32_ and the client browser works using web
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sockets. ESPUI does not need network access and can be used in standalone access
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point mode. All assets are loaded from the internal SPIFFS filesystem of the
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ESP32.
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This section will explain in detail how the Library is to be used from the
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Arduino code side. As of now the Facilino blocks are not implemented. In the
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arduino setup() routine the interface can be customised by adding UI Elements.
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This is done by calling the corresponding library methods on the Library object
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ESPUI. Eg: `ESPUI.button(“button”, &myCallback);` creates a button in the
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interface that calls the “myCallback” function when changed. All buttons and
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items call their callback whenever there is a state change from them. This means
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the button will call the callback when it is pressed and also again when it is
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released. To separate different events an integer number with the event name is
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passed to the callback function that can be handled in a `switch(){}case{}`
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statement. Here is an overview of the currently implemented different elements
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of the UI library:
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#### Button
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Buttons have a name and a callback value. They have one event for press and one
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for release.
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#### Switch
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Switches sync their state on all connected devices. This means when you change
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their value they change visibly on all tablets or computers that currently
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display the interface. They also have two types of events: one for turning on
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and one for turning off.
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#### Buttonpad
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Button pads come in two flavours: with or without a center button. They are very
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useful for con-trolling all kinds of movements of vehicles or also of course our
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walking robots. They use a single callback per pad and have 8 or 10 different
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event types to differentiate the button actions.
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#### Labels
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Labels are a nice tool to get information from the robot to the user interface.
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This can be done to show states, values of sensors and configuration parameters.
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To send data from the code use `ESP.print(labelId, “Text”);` . Labels get a name
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on creation and a initial value. The name is not changeable once the UI
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initialised.
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Labels automatically wrap your text. If you want them to have multiple lines use
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the normal `<br>` tag in the string you print to the label
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#### Slider
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The Slider can be used to slide through a value from 1 to 100. Slides provide
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realtime data, are touch compatible and can be used to for example control a
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Servo. The current value is shown while the slider is dragged in a little bubble
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over the handle.
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#### Initialisation of the UI
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After all the elements are configured you can use `ESPUI.begin(“Some Title”);`
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to start the UI interface. (Or `ESPUI.beginSPIFFS(“Some Title”);` respectively)
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Make sure you setup a working network connection or AccesPoint **before** (See
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example). The web interface can then be used from multiple devices at once and
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also shows an connection status in the top bar. The library is designed to be
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easy to use and can still be extended with a lot of more functionality.
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# Notes for Development
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If you want to work on the HTML/CSS/JS files, do make changes in the
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`examples/gui/data` directory. When you need to transfer that code to the ESP,
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run `tools/prepare_static_ui_sources.py -a` (this script needs python3 with the
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modules htmlmin, jsmin and csscompressor). This will generate a) minified files
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next to the original files to be uploaded with the ESP32 sketch data uploader
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mentioned above and b) the C header files in `src` that contain the minified and
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gzipped HTML/CSS/JS data (which are used by the **prepareFileSystem** example
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sketch or when they are served from PROGMEM; see above in the section "Getting
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started"). Alternatively, you can duplicate the `examples/gui` directory and
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work on the copy. Then specify the `--source` and `--target` arguments to the
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`prepare_static_ui_sources.py` script (run the script without arguments for
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help).
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If you don't have a python environment, you need to minify and gzip the
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HTML/CSS/JS files manually. I wrote a little useful jsfiddle for this,
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[see here](https://jsfiddle.net/s00500/yvLbhuuv/).
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If you change something in HTML/CSS/JS and want to create a pull request, please
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do include the minified versions and corresponding C header files in your
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commits.
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# Contribute
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Liked this Library? You can **support** me by sending me a :coffee:
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[Coffee](https://paypal.me/lukasbachschwell/3).
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