2. How the Example Works
The embedded application in the host MCU runs on MicriumOS, and the Wi-Fi module is connected to the Host MCU via a UART inter-
face. The LCD screen is connected via an SPI interface on the Host MCU.
1
The board displays its MAC
address on the LCD.
2
The whiteboard page is
hosted at Amazon Web
Services (AWS). Browse to
the page and enter the
board’s MAC address
(unique ID).
3
When a finger lifts from the
touch screen, an image of
the drawing gets posted to a
web service at AWS EC2.
4
AWS EC2 not only hosts the
whiteboard webpage, but
also acts as a proxy server
to process the image.
The web service converts
the image to a special
format that makes it ready to
display on the board’s LCD.
5
The board queries a web
service at AWS EC2
periodically to check if the
image has changed. If so, it
will download the image and
display it on the LCD.
Figure 2.1. System Overview
QSG145: WGM110 SLEXP4320 Wi-Fi Expansion Kit
How the Example Works
silabs.com
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