Testing Detailed Concepts
Table of Contents
- Single Side Deflection 50lb Displacement
An analysis was done to see if lifting the 25lbs structure to determine if it would be damaging to the PT if they had to perform this task. NIOSH of Lifting Tower Conclusion: The lift index is below 1 which means that given the assumptions and correct posture it is not a dangerous operation.
Push force of patient
Angle was determined above in force needed to fall to be 24.5 degrees
Top of Tower(60") = 24.9" Required force:
Middle of Tower(30") = 12.45" Required force:
Base of tower(10") = 4.15" Required force:
Force able to push at that distance:
Maximum distance the patient can push is 12" not 24" proven by 3DSSPP.
Distance to Patient and Functional Reach
Back up measurement tools:
- Laser Tape measure
- Mechanical Tape Measure
- Mat with tower locations
- Spark Fun Electronics
- Serial Enabled 20x4 LCD - Black on Green 5V
An LED display screen will be utilized in the main tower to display current status, control actions, setup communication, and choose games. Additionally, it will display relevant information following the exercise for the PT to record.
Buttons to choose options on screen
Concern with having low power mode.
For ease of use, a pair of interchangable and rechargeable batteries will be used to operate the device. By utilizing a battery-powered solution, we maximize the portability of the device.
- Chosen Wireless:
ZigBee Wireless (802.15.4)
During powerup of the main tower, and bootup out of low-power mode, ZigBee wireless communitcations will be enabled to retreive information about surrounding towers. If other towers are found, a message confirming this will appear on the status screen. While in 'game' mode, with multiple towers enabled, all targets will be utilized, regardless of the number of towers. This plan allows for maximum expandability in both number of towers, and number of buttons available during exercises.
For the needs of our current design, the MSP430-F16(11/12) appears to be the best option. Offering ZigBee wireless connectivity, for communication between towers, as well as an extremely low power design, the MSP430 offers a large number of digial inputs and outputs and ~50k flash memory.