Hello.
Here is my first project contribution to this forum.

I use several Android tablets mounted on walls in my house to control and verify things and the communication i use there is MQTT so mcModules MQTT support feels very natural for me. Something that i need is very small touch screen and the possibility to use them to send MQTT, one example could be a little 2.4" screen next to the light switch that could control the Sonos in that room.
The problem I had is that I need everything to be small so that it easily could be fit inside a case or inside the wall behind the screen.

mcModule is the perfect device for this, it is very small and it has MQTT and Uart serial communication that is all you need to have this up and running.

I Am providing a simple example and also a short video so that you could see it in action.

Code loaded to mcModule
Define PinMode Pin1 As DigitalInput //RX
Define PinMode Pin3 As DigitalOutput //TX

Class NextionTest
    Shared serial As Uart
    Shared Event Boot()
        // Enable serial communication
        serial = Uart.Create(9600, Pin.Pin3, Pin.Pin1)
    End Event
   
   
    Shared Event Uart0Receive()
        //Data is received
        Dim chr As Integer = serial.Read
        If chr = 1 Then
            //Button 1 clicked
            //Turn on Green LED
            LedGreen = True         
        ElseIf chr = 2 Then
            //Button 2 clicked
            //Turn off Green LED
            LedGreen = False
        ElseIf chr = 3 Then
            //Button 3 clicked
            //Turn on or off Red LED
            LedRed = Not LedRed
        End If     
    End Event
End Class



Please ask questions about this and I will do my best to answer them.

Thanks T2.
I will alao update the code to show how you could update the display with information that is coming to the mcModule with MQTT and also show how the touchscreen could make something happen on another mcModule with MQTT.

I have to say that's it pretty cool that with only two cables from the screen have communication to any device in the world (MQTT)

Hello.

The Touchscreen that I am using in the above example is a Nextion and the exact model that i used is NX3224T024
It is a 2.4" screen and as you could see in my code it is very simple to communicate with it.

The display is configured with Nextion Editor.
It is a simple tool to drag and drop buttons and things like that.

And then you assign what should happen when the different objects is being pushed.

In this simple example I am just sending 1,2 or 3 from the different buttons on the display.

The logical level of the display is 3.3V so no need for a level shifter.

Hello.
I will do my best to help you with this.

I am using Nextion Editor Version 0.38
In that program you drag and drop different "functions" like buttons, text and things like that.
And when you are done you compile and that file should be installed on the display.
You could also debug the project without the need of an display, a very nice feature.

I have uploaded one project on GitHub that will get you started https://github.com/Isaksson/Nextion
It's a project for monitoring temperature and battery.

I have included all images and fonts needed for the project.

Try this and let me know how it goes.

That sounds good 

Sure, I pushed some code to the same repository (this code only send data to the display it does not receive any data)

I have made some changes in the code that i not have verified but that does not matter, you will see how it is done.
Receiving data is not any problem, just ask if you need anything about that.

I have only used the sd-card way of moving my files.
So i don't know, but to move the file with sd-card works good enough, I debug in the emulator so no need for the actual device there.