Petri Scanner

For an awesome class called POE we had two weeks to build a simple device to scan a petri dish and determine it's opacity using photoresistors, LEDs, servos, and an Arduino. My partner (Steph Northway) and I made the device you see here, where one servo rotated the petri dishes, the other servo moved a scanner with photoresistors back and forth across the dish, and an LED underneath the dish shone through the dish.