slides: https://arjunmakesthings.github.io/presentations/slides/260228_stupid-hackathon.html#1
circuits:
- electricity refresher
- battery
- wire
- load
- microcontroller:
- led
rough notes for planning:
- explaining ‘loads’. we use leds.
- powering one led with a switch.
- moving to microcontrollers.
- 16 leds with one microcontroller.
- one pin for many
