Coding: Makey Makey Code-a-Key BackpackCoding: Makey Makey Code a Key Backpack Have you ever wanted to combine Makey Makey and the BBC micro: bit? The Code a Key Backpack enables you to do just that! Trigger key presses in your Makey Makey projects with motion, temperature, light, and sound to unlock a new realm of possibilities. Makey Makey designed and built the Code a Key backpack to combine the strengths of both the Makey Makey and the BBC mico: bit (sold separately) into your projects