I made a boost circuit to boost a single AA up to 3.3 V or 5 V, and it plugs directly into a breadboard. I'm wondering what kinds of creative uses people can come up with for it. The picture shows it powering an ESP8266. Other ideas?
https://hackaday.io/project/7050-boostick-small-aa-voltage-booster
https://hackaday.io/project/7050-boostick-small-aa-voltage-booster