# Title Team Members TA Documents Sponsor
7 Electronic Toilet Paper Dispenser and Tracker
Kevin Wang
William Rick
Kexin Hui design_review
Group Members (Name - NetID):
Kevin Wang - klwang4
William Rick - wrick2

Title: Electronic Toilet Paper Dispenser and Tracker
IDEA post link:

Living with multiple roommates, one is often thinking, "I just bought toilet paper last week. How are we out already?" Our project is an electronic toilet paper dispenser and tracker that can reduce waste. Each roommate will have their own ID, with multiple ways to sign in to the toilet paper dispenser: RFID card, username and pin button input, and possibly NFC on their phone. Once signed in, we will use an infrared or ultrasound sensor to detect a wave of the hand, which will dispense one “serving” of toilet paper. (The serving size can be adjusted to accommodate different usage levels.) This will be accomplished using a geared DC motor, continuous rotation servo motor, or stepper motor, in a mechanism similar to that of an automatic paper towel dispenser. This will take experimentation to determine the most accurate method. Each roommate's usage will then be saved and displayed on an LCD screen along with other statistics and options.

Additional optional components may include a piezo beeper for sound alerts (an alarm when someone has taken way too much toilet paper in one sitting) and some LED’s to flash for different signals, such as when the toilet paper is low. Another feature we will add is alerting a user if the toilet paper is out at the moment when they sit down on the toilet. This can be done with an additional ultrasound or IR sensor to detect when a person has sat down or is near the toilet.

We intend to prototype using an Arduino, but then move to a PCB with an Atmel AVR ATMEGA* family microcontroller for a more permanent installation. The PCB will also contain the motor driving circuit and DC power regulation.The device will be powered by battery or DC power (6-12V).

Few current solutions exist for toilet paper and are not widespread. The closest product is the automatic paper towel dispenser in public restrooms, which only dispense based on a hand wave, but do not track usage in any way. Furthermore, there are no solutions in this space that track usage, not to mention usage for individual persons.

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Project Description

Computed Tomography, often referred to as CT or CAT scans, is a modern technology used for medical imaging. While many people know of this technology, not many people understand how it works. The concepts behind CT scans are theoretical and often hard to visualize. Professor Carney has indicated that a small-scale device for demonstrational purposes will help students gain a more concrete understanding of the technical components behind this device. Using light rather than x-rays, we will design and build a simplified CT device for use as an educational tool.

Design Methodology

We will build a device with three components: a light source, a screen, and a stand to hold the object. After placing an object on the stand and starting the scan, the device will record three projections by rotating either the camera and screen or object. Using the three projections in tandem with an algorithm developed with a graduate student, our device will create a 3D reconstruction of the object.


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• Grid of photo sensors built into screen

• Light source

• Power source for each of these components

• Control system for timing between movement, light on, and sensor readings