J-M-L:
Well that’s not what you did - right?
You did not describe what a micro-controller is - you described some of things you can do with it
Having seen a physical MCU chip, the audience immediately wished to know the use of it -- they move by taxi cabs very often and have fresh memory of Taxi Meters which use MCU; they go to shops and very much familiar with Weighing Scales which use MCU; they have Prepaid Electrical Energy Meters in their houses which use MCU.
These gadgets are consumer products and are being sold regularly in large volumes in a country of about 160 millions population. These are very small gadgets in size, and they could be developed using Arduino UNO Kit. These particular examples are purposely placed to motivate the audience (in fact 150 senior level pupils) so that they dream to be Entrepreneurs for which they should be concentrated in MCU Programming/Interfacing. (This is the trick of the Teacher for the pupils to go with Arduino; however, less than 5% pupils like the subject though more than 70% pupils do well in the quizzes and exams!!!)