Note: The expendable cost for this activity is very low because the main items—MaKey MaKeys, breadboards, cables, jumper cables, pushbuttons (~$57 per project/group)—are expensive, yet fully reusable by taking apart the finished products.

Each group needs:

• MaKey MaKey, such as the standard/classic kit for $50 at SparkFun
• mini-USB cable (included in the above MaKey MaKey kit)
• 8 jumper cables (a set of 30 included in the above MaKey MaKey kit)
• breadboard, such as this one for ~$5 at SparkFun
• 4 buttons, such as from a set of 12 assorted tactile buttons for ~$5 at SparkFun
• computer with Scratch program, available at https://scratch.mit.edu/projects/132120896/#fullscreen
• Build a Binary Trumpet Worksheet

To share with the entire class:

• paper and pencils