MDMScreen must performs two main functions - displays information and controls other nodes. I am going to use this in each room in my house. The main module of the device is very popular 2.4" TFT LCD Touch Display Nextion NX3224T024G. You can read about this module there. Also there are many examples how to create your own interface.
And as usually MDMScreen will be have next feauters:
M25P40 (SPI flash);
CP2102 (USB to UART);
RFM69 or NRF24 radio network;
powered by 5V phone charger (via microUSB);
MDMS programming connector.
I show my first prototype on fotos below :
I show the concept on the picture below:
In am going to do next steps:
Create a concept.
Develop schematic and PCB
Solder and test the first device
At all of this steps can be some changes, but i think it's normal :)