Upgrading an existing device
What if you already have a device with an older display, e.g. monochrome, two-color, two-line etc.? How can BT817Q controller help then?
Let’s go back to our coffee machine. It makes various types of coffee perfectly well and does not need to be changed but it has a small, black and white, non-touch display while we want it to have a color touchscreen. The easiest way to proceed is to use an intelligent display that will generate graphics.
We have customers who did not change anything in their coffee machine because it already had a very popular SPI interface and it was enough to just connect it to a modern, color display with a touchscreen. They suddenly had a brand new machine with the same hardware inside.
So, as a company, you do not have to invest in anything new, you can use even the same PCBs, perhaps with some slight modifications but you can use the same processor as before. Here, they used almost the same program for handling the machine just simply adding a new display to their SPI interface. Alternatively, you can add a relatively simple program that will display the new menu and icons on the screen and handle it from the user interface side.
In this situation, if your PCBs are certified and you have an SPI interface, you do not need to recertify it. It is a great advantage if you have programs developed over many years and are used to your CPU, to a certain programming environment. Now, you can just add a color display.
Today, thanks to the EVE4 series, the use of an intelligent display is possible even with the oldest and simplest processor. No matter how slowly the commands are being sent, you can even view movies displayed from the internal memory. They are uploaded once, during the production of the display, and then just played which is why the speed of the processor in this case is of no consequence. That’s what these smart displays are for.