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.
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.
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.
A box full of startup ideas, a new procedurally generated idea is displayed every time it is opened.