# Title Team Members TA Documents Sponsor
47 Survival Wristband
Derek Niess
Fethi Alp
John Quinn
Madison Hedlund design_document1.pdf
Fethi Bartu Alp - falp2
Derek Niess - dniess2
John Quinn - jmquinn2

Problem Statement: The most common reason for death in the event of an avalanche is not because of snow hitting people with very high magnitudes but it is because people suffocate trying to find a way out while staying under a huge amount of snow. After an avalanche hits a person, he/she becomes very dizzy and loses his/her orientation. Seeing everywhere white, the person under the snow can't find the way he/she needs to dig in order to reach the surface. Because of digging in the wrong direction people suffocate and sadly die under the snow.

Solution Overview: What if we can integrate a direction display/pointer into a wristband that will constantly display the direction the person needs to dig in the event of an avalanche. The direction would always adjust itself to show the opposite direction to the ground, showing the person the direction he/she needs to dig. This same wristband can also be used by surfers since they also suffer from the same threat, just in a different environment. The display would be LED with an arrow in 3 dimensional space (a X would be pointing down while a dot will point upwards just like in physics.)
After some thought we found out that to accomplish this, instead of a wristband that always shows the opposite direction of gravity we would need a wristband that constantly shows the direction of the normal force. Since many mountains are inclined surfaces the shortest route out of an avalanche is to move perpendicular relative to the ground, which is the direction of the normal force. To accomplish this we will still need sensors to determine the orientation of the user which will be a magnetometer, accelerometer, gyroscope. Our pcb will be used to take the input data from the sensors and process it in order to determine the correct direction and display it on the wristband screen.
Possible Additional features: We can also add a feature to the wristband that will notify the surfers for the undercurrents so surfers know to avoid certain spots.

Solution Components:
Subsystem 1: 2-Dimensional Orientation
We will use a magnetometer, which essentially measures the direction, strength, and the relative change of a magnetic field at a particular location. The magnetometer will be used to determine the 2-dimensional orientation of the wristband.

Subsystem 2: 3rd Dimension
An dual sensor with an accelerometer and a gyroscope will be used to determine the device rotations and hence the 3rd (z) dimension to completely give us the 3 dimensional orientation of our wristband.

Subsystem 3: PCB
There are many things we would like to achieve with our PCB. First off, since we are looking for the direction of the normal force we would need our pcb to determine the slope of the inclined plane we are currently at. After the implementation of the 2 subsystems determined above (after having a detailed orientation system), we can estimate the slope of our plane by the change in the distance we have already travelled. Using the x, y, z data from only the most recent part of the mountain that the skier has skied through will give us a rough estimate of the slope.

Subsystem 4: Power Subsystem
We will need a way to supply power to this wristband in order for the sensors and LED display to function properly. We propose to use a lithium battery to provide power to all of the components of the wristband

Criterion for Success:
The device reliably shows the right direction at any given angle and position of the wrist
The direction is clearly visible for the user.
The device is safe to use and comfortable to wear.

Master Bus Processor

Clay Kaiser, Philip Macias, Richard Mannion

Master Bus Processor

Featured Project

General Description

We will design a Master Bus Processor (MBP) for music production in home studios. The MBP will use a hybrid analog/digital approach to provide both the desirable non-linearities of analog processing and the flexibility of digital control. Our design will be less costly than other audio bus processors so that it is more accessible to our target market of home studio owners. The MBP will be unique in its low cost as well as in its incorporation of a digital hardware control system. This allows for more flexibility and more intuitive controls when compared to other products on the market.

Design Proposal

Our design would contain a core functionality with scalability in added functionality. It would be designed to fit in a 2U rack mount enclosure with distinct boards for digital and analog circuits to allow for easier unit testings and account for digital/analog interference.

The audio processing signal chain would be composed of analog processing 'blocks’--like steps in the signal chain.

The basic analog blocks we would integrate are:

Compressor/limiter modes

EQ with shelf/bell modes

Saturation with symmetrical/asymmetrical modes

Each block’s multiple modes would be controlled by a digital circuit to allow for intuitive mode selection.

The digital circuit will be responsible for:

Mode selection

Analog block sequence

DSP feedback and monitoring of each analog block (REACH GOAL)

The digital circuit will entail a series of buttons to allow the user to easily select which analog block to control and another button to allow the user to scroll between different modes and presets. Another button will allow the user to control sequence of the analog blocks. An LCD display will be used to give the user feedback of the current state of the system when scrolling and selecting particular modes.

Reach Goals

added DSP functionality such as monitoring of the analog functions

Replace Arduino boards for DSP with custom digital control boards using ATmega328 microcontrollers (same as arduino board)

Rack mounted enclosure/marketable design

System Verification

We will qualify the success of the project by how closely its processing performance matches the design intent. Since audio 'quality’ can be highly subjective, we will rely on objective metrics such as Gain Reduction (GR [dB]), Total Harmonic Distortion (THD [%]), and Noise [V] to qualify the analog processing blocks. The digital controls will be qualified by their ability to actuate the correct analog blocks consistently without causing disruptions to the signal chain or interference. Additionally, the hardware user interface will be qualified by ease of use and intuitiveness.

Project Videos