Construction Diary 3 Display preparation
Andrew has used a Nextion NX3224T024 - Generic 2.4" TFT LCD Touch Display for the televisor an Human Machine Interface (HMI). These are available from various sources including eBay. They are used extensively as an interface between Arduino and Raspberry PI projects due to their easy of use. There are only four interface connections to the display, zero and plus five volts and transmit and receive signals.
This stand-alone display has on-board intelligence whereby the graphics can be configured by a text editor. An on-board microSD card allows us to load Andrews HMI software onto the unit.
The latest software for this project is located at
https://github.com/andrew-davie/ArduinoVisorFirst thing we need to do is get hold of a microSD card. There are different versions but we need a class 10 card as we will need this later for the control board for real time data transfer of the NBTV video signals.
Firstly, we need to format this card and load a file presently named ‘nbtv3.tft’ from the github depository as shown above. Initially the MicroSD card will need formatting. You will probably need a MicroSD adapter for your PC either a USB or an adapter card. Free formatting software can be found at
https://www.sdcard.org/downloads/formatter/ , after which the .tft file will need loading into the root directory with no other files loaded. The next step is important as it can damage the display.
Place the microSD card into the slot on the display card. Using the miniature USB adapter board supplied with the display connect up the positive and negative connections to the board. Power up the display from your commuter’s USB port and Andrews HMI software should load after a few moments. Upon completion his graphical display should be displayed. The MicroSD card can now be removed. Beware that the touch screen is not operational until it is connected to the main board.