You can set a message on a dot matrix display by Alexa!
This is a working display based on Star Trek TNG. Uses APIs and sensors for weather, VOCs, power measurement, calendar, fitness, and news.
This uses AMG8833 and HC-SR04 to measure temperature and give an output to Alexa, AWS DynamoDB, 1.44" TFT and LCD with a NodeMcu.
Alexa controlled timers at a glimpse. A really fancy egg-timer with added temperature control.
An IoT Thing using the Amazon cloud that monitors and reports observed radio frequency spectral power and can be remotely controlled.
A box full of startup ideas, a new procedurally generated idea is displayed every time it is opened.