This year, I made a bet introducing 30 hours of Arduino teaching for the student web developers of the Cergy Pontoise university (in the professional "licence" training course). We got started this week, and everything went really smoothly. All were interested. The pleasure they took in turning LEDs on and off was amazing :-)
If other teachers are reading this, I am willing to exchange experiences.
I am also teaching in the "Pays de la Loire" (France) area (more precisely Vendée) since I live there.
Have a great evening