Microprocessor Architecture Team Goals Data Storage/ RF Transmission

Power, Storage, and Management Post Processing/ Side line computing

Football telemetryTeam Members: E. Anane-wae, A. Balasubramanian, S. Bhosale, A. Buschkoetter, B. Claussen, A.Diaz, A. Eidsmore, J. Gilfix, C. He, P. Margana, J. Maselli, P. Mustafa, G. Musyj, S. Patel, M. Wolfer, J. Zhang, Jun Zhang Advisors: Prof. Talavage, Prof. Nauman, E. Breedlove, A. PhillipsSchool : Electrical and Computer Engineering

Behind the Ear (BTE) Device

Throughout the game, the cranial acceleration of a given player is monitored using accelerometers placed on a cap. Sampling occurs throughout the game at 2.2kHz until a sizeable impact occurs (determined by the threshold range). When such an impact occurs, the readings prior to and post impact are stored to a microSD card. After these events are stored sampling continues as before and the cycle repeats.

Serial Communication

Power

• Sensors are placed in cap worn by player

• Sample at 2.2kHz

Accelerometers& Gyroscope

• Analyzes sampled data

• Stores data if “impact” detected

Microcontroller ATxmega128A1 • After the micro

performs A/D conversion, the data is stored here in digital form

microSD card

Pre-filtering to avoid aliasing

Analog data

Impact Detected

This is a diagram of the power supply circuit. The battery charges while the device is plugged in/ syncing data with the computer. The battery and the DS2745 battery monitor is in parallel with the Max 1874 chip. The DS2745 and the Max 1874 will connect with the micro controller.

• Create a helmet that will detect both linear and rotational accelerations encountered by athletes during play• Find an effective method to collect and store analog data• Develop a filtering method to accurately detect a player received

“impact”• Convert and condense the collected raw data into a manageable

sample set• Provide accurate and understandable data to the Purdue neurotrauma

group (PNG) to be used in studies aimed at quantifying the relationship between impact received and the extent of the induced brain damage

Zigbee is a wireless protocol that does not require a continuous connection between the modules. Instead, it utilizes a pinging protocol that broadcasts its packet every interval so surrounding modules can receive it.

Zigbee module (MeshNetics Zigbit MNZB-24-A2) inserted into every helmet

A similar device to the helmet is being developed that will include less sensors and no wireless transmission, but will be more affordable and in a smaller package. It will rest on the neck, behind the head, and use the neck or ears to stay attached. It will also have other features, such as a capacitive sensor to know when the device is on the neck.

Battery: 063450 Max 1847

Battery Monitor: DS2745

Device is connected to computer

Microcontroller

Data Processing SequenceData from RF

Data format conversion

Use linear regression to solve

the overconstrained

problem

Calculate the magnitude of the

acceleration of the center of the mass

Set a threshold to identify the

impulse(event)

Dump the 'events' and player's

information into the database

Collect players' personal

information

Returned Data

In case one module is too far from host, a network of Zigbee modules can relay data through surrounding modules back to the host.

CONCEPTUAL DESIGN

Device Features:• 2kHz sampling rate• Impact notification• microSD storage• Low power• Flexible shell• Comfortable and lightweight• Possible RF transmit

This device has the advantage of being used in sports that do not typically use helmets, such as soccer, basketball and rugby.