Bluetooth Headtracker

Hardware

Built with simple, ready to order parts from common suppliers. Purchase 1 each of the following:

• Bluefruit EZ-Link - bluetooth modem w/ baud rate detection - http://www.adafruit.com/product/1588
• Arduino Pro Mini 3.3V - https://www.sparkfun.com/products/11114
• Power switch - https://www.sparkfun.com/products/102
• GY-86 - 10 DOF flight control module with MPU6050 + HMC5883L + MS5611 - http://www.amazon.com/Arrela-Control-Ms5611-Hmc5883l-Mpu6050/dp/B00KKJYMO6/
• LiPo Battery - https://www.sparkfun.com/products/731
• LiPo Charger - https://www.sparkfun.com/products/10217 (note you need to cut off the JST connector to fit it in the enclosure)
• Small quantity of stranded ribbon cable.

One of the following, needed to program the arduino. (One use only! Borrow from a friend?)

• FTDI Basic 3.3V - https://www.sparkfun.com/products/9873
• FTDI Cable 3.3V - http://www.adafruit.com/product/70

You can also choose to leave the LiPo charger out of the enclosure for small space savings.

Software

This project uses the FreeIMU library to read the motion sensors and calculate sensor-fused orientation. I've attached a copy of the FreeIMU_quaternion code here.

Be sure to set the baud rate in the program to the max baud for the Arduino Pro Mini, 38400 bps. You should only need to upload this once.

File:FreeIMU_quaternion.zip

Enclosure

Solidworks Files - File:btht_solidworks.zip

STL Files - File:btht_enclosure_stl.zip

Reference

other intertial Measmurement Units

Head-tracking with the MPU6050

• using Wire interface - http://www.varesano.net/blog/fabio/initial-tests-freeimu-v04-and-mpu6050
• using i2cdevlib - https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/MPU6050/Examples/MPU6050_DMP6
• http://www.geeetech.com/wiki/index.php/MPU-6050_Triple_Axis_Accelerometer_%26_Gyro_Breakout
• IMU - https://dev.qu.tu-berlin.de/projects/sf-razor-9dof-ahrs/wiki/Tutorial
• https://www.sparkfun.com/products/11028 or even cheaper from Amazon

Example with Arduino Nano

• http://www.geekmomprojects.com/mpu-6050-dmp-data-from-i2cdevlib/

GY-80=

• https://github.com/vshymanskyy/GY80

GY-86

• http://amzn.com/B00KDMJBFK

IMUs for position

• https://developer.oculusvr.com/forums/viewtopic.php?f=33&t=1679
• https://www.youtube.com/watch?v=6ijArKE8vKU