Luke Smart Walker GROUP #3 AARON LEE CAMILO MORENO SCOTT HINDEN - - PowerPoint PPT Presentation

Luke Smart Walker

GROUP #3 AARON LEE CAMILO MORENO SCOTT HINDEN RYAN LEE

Background

• The use of a walker helps to support

and stabilize a person while walking. The walker must be adjusted to waist level to keep straight posture while

• walking. The user is constantly

supporting roughly half of his body weight while using the walker, which requires them to exert themselves. The maneuverability of the walker is entirely up to the user, which is very limited in some cases.

Arduino MEGA and Motor Driver

• Arduino Mega is connected to all of the

sensors and acts as the controller of the smart walker.

• The motor driver is connected to the

Arduino and dc motors.

• The Arduino sends pwm signals to the

motor driver to control the speed of the motors.

DC Motor and Brakes

• To power rear wheels of walker
• We are using a 12V DC gear motor for

more power and control.

• Using a DC motor driver to control

motor speed with Arduino through PWM.

Lead Acid Rechargeable Battery

• We are currently using a rechargeable

lead acid battery.

• The motor is connected directly to the

battery with a fuse and gives 12v to the dual motor drive.

• We are using a Buck Converter to

drop the voltage from the battery (12v) to the Arduino (5v)

Led Battery Level Indicator

• A voltage divider circuit that drops the voltage from the battery down to a

voltage that the arduino can read. This voltage is between 4.2v-0v.

• Green LED-Battery is at 11.5v or higher
• Yellow LED-Battery is between 11.5v and 10.5v
• Red LED-Battery is below 10.5v

Voltage Divider Circuit

Circuit used to step down the 12 volts from the battery to 4.2 volts so the arduino has a safe voltage to read.

Touch Button

• Two touch buttons are mounted on the

handlebars of the walker to control the power.

• Each button sits on top of a 3D print mount

that fits around the handlebar.

• Both touch buttons must be pressed in
• rder for the walker to move.

Ultrasonic sensors

• We used 4 ultrasonic sensors.
• The ultrasonic sensors send out a sound

wave and then tries to receive the wave back.

• This allows the sensor to measure the

time it takes to receive the sound wave.

• Our team used this time to measure

distance from an object.

3D Parts: Mounts and Cases

Obstacle Warning Feature

• Two ultrasonic sensors are mounted

facing forward just below the basket to sense obstacles.

• The walker gradually slows down

based on how far away the object is from the walker.

• If the walker gets to close to the
• bject it stops so that the user can

move around the obstacle.

Curb Detection Feature

• Two ultrasonic sensors are mounted at

an angle above the wheels to sense a drop.

• Once the drop is detected the walker

brakes and begins to reverse so the user does not fall off the curb.

Audio Alert

• The speaker alerts the user if there is an obstacle in

front of the walker with the warning “Obstacle Ahead”.

• The Speaker alerts the user if there is a curb in front of

the walker with the warning “Backing Up”. This signifies that the walker is backing up away from the curb.

9 Degrees of Freedom Accelerometer

• Senses change in elevation and tilt to

determine wheel speed

BlueTooth App

• Tracks distance from walker to central node.
• If user leaves the area where the node is it will send a text

message to the users care-taker.

Design

Motor and Wheel

Gantt Chart

Budget

• 2 X DC Motor
• $50 each

Depending on torque

• 5 X Ultrasonic
• $4 each

Might have in Parts Room

• 1 X Mega Arduino
• $40

Good for more outputs

• 1 X Bluno Nano
• $30

Bluetooth

• 1X Walker
• $60

From Wal-Mart

• 2 X Pressure Pads
• $7 each

Depending on size

• Battery Supply
• $80

Depending on power

• 9 Degrees of Freedom
• $15

Depending on functionality

• Voltage Regulator
• $15
• Dual Motor Driver -

$41

• TOTAL = around $400-500 (after tax and shipping)

References

• https://www.google.com/patents/EP2823795A1?cl=zh
• https://www.google.com/patents/EP2823795A1?cl=en
• http://worldwide.espacenet.com/publicationDetails/biblio?CC=EP&NR=2823795A1&KC

=A1&FT=D

• https://data.epo.org/gpi/EP2823795A1-Electric-assisted-walker
• https://www.google.com/patents/US8810407?dq=sensor+assisted+walker&hl=en&sa=

X&ved=0CCYQ6AEwAWoVChMInaKLtqbyyAIVyOcmCh1Y9QmN

• http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=/netah

tml/PTO/search-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/8810407

• http://worldwide.espacenet.com/publicationDetails/biblio?CC=US&NR=8810407B1&KC

=B1&FT=D

• http://www.aafp.org/afp/2011/0815/p405.html