In this microcontroller-less circuit you can hook up a simple two motor line-following robot using the skills learned in the breadboarding lessons.

Extension Idea

• Create a cardboard robot body to use this to accomplish a common household task.

In this collision with real-world objects, students can create a circuit that measures the resistance of a ribbon drawn on a page and outputs that value as a sound.

*Warning: Do not attempt as a full-class project without ear plugs or a high threshold for white noise*

Extension Idea:

• Create a symphony using art.