# Title Team Members TA Documents Sponsor
7 Electronic Toilet Paper Dispenser and Tracker
Honorable Mention
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.

Low Cost Myoelectric Prosthetic Hand

Michael Fatina, Jonathan Pan-Doh, Edward Wu

Low Cost Myoelectric Prosthetic Hand

Featured Project

According to the WHO, 80% of amputees are in developing nations, and less than 3% of that 80% have access to rehabilitative care. In a study by Heidi Witteveen, “the lack of sensory feedback was indicated as one of the major factors of prosthesis abandonment.” A low cost myoelectric prosthetic hand interfaced with a sensory substitution system returns functionality, increases the availability to amputees, and provides users with sensory feedback.

We will work with Aadeel Akhtar to develop a new iteration of his open source, low cost, myoelectric prosthetic hand. The current revision uses eight EMG channels, with sensors placed on the residual limb. A microcontroller communicates with an ADC, runs a classifier to determine the user’s type of grip, and controls motors in the hand achieving desired grips at predetermined velocities.

As requested by Aadeel, the socket and hand will operate independently using separate microcontrollers and interface with each other, providing modularity and customizability. The microcontroller in the socket will interface with the ADC and run the grip classifier, which will be expanded so finger velocities correspond to the amplitude of the user’s muscle activity. The hand microcontroller controls the motors and receives grip and velocity commands. Contact reflexes will be added via pressure sensors in fingertips, adjusting grip strength and velocity. The hand microcontroller will interface with existing sensory substitution systems using the pressure sensors. A PCB with a custom motor controller will fit inside the palm of the hand, and interface with the hand microcontroller.

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