With my project I aimed to create a device that could be used to track the correlation between daylight and how much time people spend inside. To achieve this, I used an Ultrasonic sensor and a photo resistor, I wrote a program that would take data measurements once every second and then print 10-minute averages. The ultrasonic sensor measures distance so a variation in its distance reading suggests movement in front of it, the photo resistor measures light. To store the data I used Putty, an app that reads the serial port and prints it to a .txt file. Then I could easily paste that data into Excel where I could then graph it. I set up the device in my dorm room and I recorded data from about 7pm to 8am. I was pleased to see that you could clearly identify when the sunset and when it rose you could also see when my roommate and I went to bed and when we woke up. In hindsight I would have used a motion sensor instead of a ultrasonic sensor, this would have yield more accurate and specific data.