This week we started to design and make the final prototype for the firefly penny box. We spent a lot of time developing the way that the machine will read and count pennies once inserted into the box, and have the pennies remain inside the box after inserting. Having spoken to coursemates, one suggested rather than having the coin inserted horiztally (like we had been trying), to have the coin vertical, like in a pool table’s design. This seemed like an elegant solution, and the button click itself orked as a stopped to force the coins to remain inside the box. We originally planned to have vertical split doors that the fireflies would pop out of, but found through testing that the flies were catching on the way back in, and it seemed too difficult to make work reliably. Hence, we ended up with single doors, each moved via servo directly.