Project

# Title Team Members TA Documents Sponsor
44 Brain-controlled portable programmable embedded system
Research Award
Shiyang Liu
Xuanyu Zhong
Yujie Chen
design_document0.pdf
final_paper0.pdf
presentation0.pdf
proposal0.pdf
video0.mp4
Nowadays, people use their hands to control modern computing systems as well as consumer electronics. We type keyboards, or swipe on tablets with our fingers as a means of input. Many other people also take the advantage of voice control everyday which is being considered as one of the very innovative inputting methods. Based on the trend of how technology gets developed today, we see the next step of inputting as we getting use of our brains.

Imagine that we need to take a look at the next step of a recipe when we get our hands messed with all the food while cooking. Swiping on the iPad then sounds very tedious. Instead, would it be nice to do so by just staring at a specific region on the screen and turn to another page of cookbook. This region blinks at a predefined frequency. By looking at it, our brains will also "blink" at the same frequency and the generated signals can be captured and distinguished from other signals with different frequencies, which will consequently allows various control options. (not just flipping recipe pages)

Our goal of this project is to build a prototype of brain-controlled portable programmable embedded system with a LCD screen that will satisfy basic functionality of our everyday computation and its user interface. With the help of electroencephalography, our device will be built on top of a micro-controller which reads input from various signals from our brains and thus supports hands-free interactions between users and computing system which will be reflected on a built-in LCD display.

A simple diagram can be found here which illustrates the basic idea of this project:
http://i1285.photobucket.com/albums/a599/sc21cn/ScreenShot2013-01-31at25324PM_zps11908c3f.png
[Note that our project consists of the micro-controller, LCD screen along with some other hardware components and wireless part. The graph represents what we propose to do within this semester (a sort of prototype). However, it may be made more advanced in the future, such as integrating the screen onto the glasses or caps people wear everyday. But it is just for future consideration.]

Active Cell Balancing for Solar Vehicle Battery Pack

Tara D'Souza, John Han, Rohan Kamatar

Featured Project

# Problem

Illini Solar Car (ISC) utilizes lithium ion battery packs with 28 series modules of 15 parallel cells each. In order to ensure safe operation, each battery cell must remain in its safe voltage operating range (2.5 - 4.2 V). Currently, all modules charge and discharge simultaneously. If any single module reaches 4.2V while charging, or 2.5V while discharging, the car must stop charging or discharging, respectively. During normal use, it is natural for the modules to become unbalanced. As the pack grows more unbalanced, the capacity of the entire battery pack decreases as it can only charge and discharge to the range of the lowest capacity module. An actively balanced battery box would ensure that we utilize all possible charge during the race, up to 5% more charge based on previous calculations.

# Solution Overview

We will implement active balancing which will redistribute charge in order to fully utilize the capacity of every module. This system will be verified within a test battery box so that it can be incorporated into future solar vehicles.

Solution Components:

- Test Battery Box (Hardware): The test battery box provides an interface to test new battery management circuitry and active balancing.

- Battery Sensors (Hardware): The current battery sensors for ISC do not include hardware necessary for active balancing. The revised PCB will include the active balancing components proposed below while also including voltage and temperature sensing for each cell.

- Active Balancing Circuit (Hardware): The active balancing circuit includes a switching regulator IC, transformers, and the cell voltage monitors.

- BMS Test firmware (Software): The Battery Management System requires new firmware to control and test active balancing.

# Criterion for Success

- Charge can be redistributed from one module to another during discharge and charge, to be demonstrated by collected data of cell voltages over time.

- BMS can control balancing.

- The battery pack should always be kept within safe operating conditions.

- Test battery box provides a safe and usable platform for future tests.