1. Check out the Stand BiMEE website here:
Stand BiMEE Motorized
Pediatric Stander
P19008
Background
Stand BīMEE is revolutionizing the way children with neuromuscular disorders interact with their environments. The Motorized Pediatric Stander Kit is a kid-friendly, economical alternative to a traditional therapeutic mobility device. The stander kit combines motorized wheels, a control system, bluetooth app, and sensor technology, allowing the device to be safely controlled and independently operated by young children. The user interface is designed for children of all capabilities with accessibility options including capacitive touch button controls and joystick. The kit can be easily assembled and adapted to multiple different brands of standing devices. The team’s main focus was developing an algorithm to manage the large amount of data from the inputs, and make it useful to the user experience.
Motors
Brushless DC (BLDC) Hub motors from Hoverboards™ used for torque output, price, and relative small package size
Motors required more power, more complex speed control solution
Algorithm
Interprets and prioritizes multiple inputs from user (joystick/buttons) and safety sensors (bump and infrared sensors)
Prioritizes inputs in the following order: safety sensors > override control > user inputs
Safety Systems (Sensors)
Infrared sensors detect and stop the stander from dangerous ledges, curbs, and stairs
Bump sensors detect contact with obstacles and stop the stander
Box and Bumper
Internal box made from 6061 T4 Aluminum sheet
3D printed PLA bumper
Ports allow the joystick and buttons to easily be plugged in and interchanged
Easy access to charging port
Engineering Requirements
Maximum speed limit of 6 mph
Stander comes to a complete stop within 3 inches of a detected object
Can take input control in the form of joystick and buttons
Deceleration rate relative to the current operational speed
Sensor data is incorporated into the basic function of the device via algorithm
Fits into the mechanical envelope of 19 in x 13 in x 5 in
Prototype cost less than $1500
Electrical System and Controls
Teensy™ Microcontroller
36V Lithium-ion Battery
ODrive V3.5 Motor Controller
Custom PCB control board design
Entire electrical system is housed in aluminum box under the bumper
Joystick and capacitive touch buttons
Only external wiring comes from joystick/button controllers
Tray Assembly
Mounted base plate allows tray to be adjusted to any user preference
Lego™ plate on top of tray allows for modular controls
Clear acrylic plexiglass tray and Lego™ plate allow the user to easily see travel path
Check out the Stand BiMEE website here:
Assembly
Easy at home assembly:
Remove front wheels from stander
Attach front wheel adapters
Attach the box/bumper combo
Attach tray
Plug in button/joystick controller
Engineering:
Ahmad Aljohani - Industrial and Systems Engineering
Jacqueline Becker - Biomedical Engineering
Megan Blakeney - Mechanical Engineering
Debere Ezeaka - Electrical Engineering
Snehal Ravindra Ingle - Electrical Engineering
Nicholas Marsaw - Electrical Engineering
Ryan O’Hara - Biomedical Engineering
The team would like to thank Professor Steven Day and guide Kenneth Mihalyov for their support and guidance. We would also like to thank CP Rochester for their expertise and encouragement.