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| − | This page explains the device settings found on the ESPEasy '''Nextion''' Plugin075. It also provides details to the various command formats that are used to send Nextion button press information or other data.
| + | #REDIRECT [[Nextion]] |
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| − | '''Nextion TFT Touch Display Information'''
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| − | The Nextion TFT Touch Display is offered in two different product families, ''Basic'' and ''Enhanced.'' Display sizes for both families ranges from 2.4-inches (6cm) to 7.0-inches (18cm). The Enhanced version has all the capabilities of the basic model, but has more memory, faster processor, and GPIO. Please note that the examples shown in this wiki have been tested on the basic version.
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| − | Here's a short YouTube video that shows examples of what you can do with a Nextion display: https://www.youtube.com/watch?time_continue=6&v=FMWQ1dXZr2I
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| − | For a quick introduction to developing a Nextion application please visit: https://www.letscontrolit.com/wiki/index.php/NEXTIONDisplay
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| − | '''Important Information'''
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| − | In addition to the two product families, there are also region specific models. More specifically, there's the Chinese market TJC series (supported by tjc1688.com) and the NX model series (supported by iteadstudio.com) that's for the general global market. The TJC site is Chinese language, the ITEAD Studio site is English.
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| − | [[File:Nx_model_400.jpg]]
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| − | Be aware that some sellers do not specifically mention the exact model number so avoid disappointment by choosing a different supplier. To be blunt, unless you have a project that specifically requires the Chinese market TJC display, our recommendation is to use the global market NX series.
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| − | '''Revision Information'''
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| − | This wiki information has been updated to include the hardware UART serial features that were added late 2018.
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| − | == Device Settings ==
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| − | '''Device:''' Display - Nextion [TESTING]
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| − | '''Name:''' The user assigned name must be '''NEXTION'''. This limitation will be removed in the future, but for now please do '''NOT''' enter any other name.
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| − | '''Enabled:''' This checkbox must be selected to enable the Nextion plugin.
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| − | == Sensor Settings ==
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| − | <!-- '''Internal PullUp:''' When selected the RX pin's weak pullup resistor is enabled. For typical installations this checkbox should be selected. -->
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| − | '''GPIO''' ★★ '''RX ← :''' Selects the ESP8266's RX signal pin. This connects to the Nextion's TX pin.
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| − | '''GPIO''' ★★ '''TX → :''' Selects the ESP8266's TX signal pin. This connects to the Nextion's RX pin.
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| − | ''Note: ★★ = "SS" is shown when Soft Serial is active; ** = "HW" when Hardware (UART) serial is active.''
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| − | == Enhanced Serial Communications, General Information ==
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| − | ESPEasy's bi-directional communication with the Nextion display can be performed two ways: ''Soft Serial'' (bit-bang) or ''Hardware Serial'' (UART). Both the Nextion and ESP8266 utilize 3.3V logic, so RX / TX voltage level conversion is not required.
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| − | '''Soft Serial''' is fixed at 9600 baud and it supports a variety of ESP8266 I/O pins. However, reliability of receiving characters sent from the Nextion may suffer due to ESPEasy's background interrupt conflicts. So using this method requires extra coding to ensure that ESPEasy correctly receives Nextion's serial data.
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| − | '''Hardware Serial''' is extremely reliable and can support a variety of baud rates. It is limited to the D7 (RX) and D8 (TX) pins. Furthermore, it requires disabling ESPEasy's serial log feature; This is automatically done when hardware serial is chosen. Most importantly, because it uses ESP8266's D8 pin a transistor buffer is required to isolate the ESP8266 from the Nextion's RX input circuity. Omitting the transistor will prevent the ESP8266 from booting correctly!
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| − | '''Advice Tip:''' Despite the extra work, the hardware serial method is strongly recommended.
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| − | Below is an example of the transistor's wiring on a NodeMCU board (consult your specific ESP8266 documentation for its pin-out details). The transistor can be nearly any general purpose BJT switching type, such as 2N3906 or PN2907.
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| − | [[File:Esp8266_buffer1_450.jpg]]
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| − | IMPORTANT: A buffer transistor is required when pin D8 is used as the serial Tx pin. Nextion +5V and GND power connections (required) are not shown.
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| − | == Enhanced Serial Communications, Settings ==
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| − | '''Use Hardware Serial:''' Select this checkbox when hardware serial is wanted.
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| − | Note: When hardware serial is used do NOT enable the Serial Log file on Tools->Advanced->Serial Port. Also, D7 must be RX, D8 must be TX. Otherwise soft serial must be used.
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| − | ''Important: When ESP8266 pin D8 is used the transistor buffer must be installed. ''
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| − | '''Baud Rate:''' Select required serial baud rate. This setting applies only to hardware serial.
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| − | ''Note: Nextion factory default is 9600 baud.''
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| − | == Lines Command Statements ==
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| − | '''Line N''': Up to twelve different Nextion command statements can be created that automatically execute at each timer interval. This provides a convenient way to periodically populate your Nextion display with data from the ESPEasy system variables. System variables are discussed here: https://www.letscontrolit.com/wiki/index.php/ESPEasy_System_Variables
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| − | For example, entering statement
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| − | ''page7.t0.txt="IP: %ip%"''
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| − | would send the ESPEasy IP address to Nextion's text attribute t0 on page 7. Or entering
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| − | ''page7.t1.txt="Signal Level: %rssi%"''
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| − | would send the RSSI dBm value to text attribute t1 on page 7.
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| − | The Nextion plugin provides an optional conversion for the RSSI value that is designed specifically for Nextion's Progress Bar attribute. Instead of using the ''%rssi%'' system variable, the RSSI dBm value can be converted to a stepped 0-100 value by substituting ''rssibar''. Here's an example that updates Progress Bar j1 on page 0:
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| − | page0.j1.val=rssibar
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| − | == Interval Options ==
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| − | '''Resend Values at Interval:''' When selected, the ''idx'' and ''value'' data is resent at each interval time. Typical applications would leave it unchecked (disabled). This setting does NOT affect the Command Statement (Lines) interval.
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| − | == Data Acquisition ==
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| − | '''Send to Controller:''' If selected the ''idx'' and ''value'' data will be automatically sent by Controller #1 using its configured protocol. The controller must be setup using ESPEasy's ''Controllers'' tab.
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| − | '''Interval:''' Choose the interval time delay in seconds; Set to zero (0) to disable. At the interval time the Nextion Command Statements are executed. If the ''Resend Values'' is enabled then ''idx'' and ''value'' data are also resent at the interval.
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| − | == Values ==
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| − | Data that is sent from the Nextion display is held in two variables.
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| − | '''Name 1:''' ''idx'' is the main Index (key) variable. For example, it can be a unique number that is sent by a Nextion touch button that has been is pressed or released. But it is not limited to that purpose; It may be used for any data that needs to be passed from the Nextion display to ESPEasy.
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| − | '''Name 2:''' ''value'' is a sub-variable related to idx. For example, it could contain "1" when a specific Nextion button is pressed, or a "0" when the button is released. The ''value'' variable can be ignored if it is not needed.
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| − | Please see the ''Nextion Command Summary'' (below) for more details.
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| − | == Nextion Command Format Summary ==
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| − | There are three different formats for sending data from the Nextion display to ESPEasy. They are named ''Touch Event'', ''Pipe-S'', and ''Pipe-U''. You are free to choose the format for your application. You can even mix different formats in the same project.
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| − | What you do with the sent data is up to you. For example, use button press data from the Nextion to trigger actions in your home automation system that control your lights, appliances, and gadgets.
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| − | '''Touch Event Format (Send Component ID)'''
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| − | Components in your Nextion application can send Touch Press Events and Touch Release Events. These actions automatically generate ''idx'' and ''value'' data if their corresponding ''Send ComponentID'' checkbox is selected.
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| − | During a Touch Press Event (that uses ''Send Component ID'') the Nextion display passes several data bytes to ESPEasy that contains the Page Number, Component ID, and Press State. The plugin packs these three bytes into the two Nextion variables, ''idx'' and ''value'' that can be sent to your home automation system. Unpacking the two bytes to restore the original data can be performed by your home automation system using simple integer math, as follows:
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| − | <code>Page Number = (Nextion idx - 500) / 256
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| − | Component ID = (Nextion idx - 500) - (Page Number * 256)
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| − | Press State = ''value'', where 0 = Press Release, 1 = Pressed</code>
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| − | Example: Touch event idx = 1527, value = 0
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| − | <code>(1527 - 500) / 256 = Page 4
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| − | (1527 - 500) - (4 * 256) = Component ID 3</code>
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| − | Result: Component Page 4, Component ID 3, Press Release Event
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| − | '''|s (Pipe-S) Format'''
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| − | The ''|s'' (Pipe-S) format has the same functionality as the Touch Event format. But it offers more flexibility because your application has the freedom to assign the ''idx'' and ''value'' data that is sent to ESPEasy. It's a more powerful too, since Nextion code can be created that performs many of the if-then-else statements that would normally be done in your home automation rules files. For example, create a toggle switch function within Nextion, then use |s to send unique idx codes for its On and Off states.
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| − | The |s format is constructed as follows:
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| − | <code>|s,i[idx],s[boolen value]</code>
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| − | where [idx] = any valid number, including signed decimal.
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| − | and [boolen value] = On or Off
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| − | For example, to send ''idx'' = 12 and ''value'' = 1 the Nextion code would be written using two statements as follows:
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| − | <code>
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| − | print "|s,i12,sOn" // Send idx and value to ESPEasy
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| − | printh 0a // Required print termination character
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| − | </code>
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| − | '''|u (Pipe-U) Format'''
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| − | The ''|u'' (Pipe-U) format is similar to the |s format. Except ''idx'' AND ''value'' data can be any number, including signed decimal.
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| − | The |u format is constructed as follows:
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| − | <code>|u,i[idx],n,s[value]</code>
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| − | where [idx] = any valid number, including signed decimal.
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| − | and [value] = any valid number, including signed decimal.
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| − | For example, to send ''idx'' = 50 and ''value'' = -3 the Nextion code would be written using two statements as follows:
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| − | <code>
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| − | print "|u,i50,n,s-3" // Send idx and value to ESPEasy
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| − | printh 0a // Required print termination character
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| − | </code>
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| − | == Nextion IDE Development / User MCU Input ==
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| − | The Nextion Plugin's Hardware Serial feature can be configured to enhance the Nextion Integrated Development Environment (IDE). Using some "hidden" hardware serial features it is possible to develop and test your Nextion application without a physical display panel. Instead you can utilize the Nextion IDE's ''User MCU Input'' feature and enable it to directly interface with the ESP8266's USB port. In case it's not perfectly clear, you can create your first working application before you spend a penny on a Nextion display!
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| − | Set this up as follows:
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| − | # Configure the ESPEasy Nextion Plugin as follows:
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| − | ## Select GPIO HW RX to D9
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| − | ## Select GPIO HW TX to D10
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| − | ## Select ''Use Hardware Serial''
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| − | ## Submit changes
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| − | # Launch the Windows compatible Nextion IDE app and load (or create) your Nextion application.
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| − | # Choose Debug to compile and run your Nextion application.
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| − | # At the bottom of the Debug screen enable ''User MCU input'' and select your ESP8266's USB port.
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| − | That's all there is to using the Nextion IDE instead of a actual display board.
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