# Title Team Members TA Documents Sponsor
10 Remotely Adjustable Cast
Alice Getmanchuk
Jack Burns
Saloni Garg
Stasiu Chyczewski design_document2.pdf
# Remotely Adjustable Cast

Team Members:
- Alice Getmanchuk (aliceg3)
- Jack Burns (jackjb2)
- Saloni Garg (sgarg27)

# Problem

For broken limbs, there are a couple types of casts: plaster, fiberglass, splint, AirCast. And while they all have their own benefits, they also have drawbacks. The non-AirCast types are durable but also heavy, can get mold, and require doctor visits. The AirCast is lighter, but can be expensive and hard to properly put back on by the patient. Currently, patients with AirCasts have no method of setting exact levels of strap tightness by themselves as originally done by the Doctor.

# Solution

The solution to the above problem is to modify an AirCast so that it can be tightened remotely. The doctor would help install the cast once and save the position of the strap tightness. Then, when patients remove their cast to bathe (which prevents mold), they can press a button in the app to correctly tighten their cast again. Additionally, there is the opportunity to have further tele-health visits with the doctor which they can use to remotely adjust the cast and help the patient regain strength. This way, the cast doesn't just act as a stabilizer for broken limbs but can further help as a rehabilitation device. No current auto-adjusting casts exist on the market.

# Solution Components

## Subsystem 1

Pressure Adjustment/Gauge Subsystem maintains and manipulates the air cells in the cast which may be hard for the user to self-inflate (especially if the cast is on the arm)
- Sensor to detect pressure of air cell: []( (Pressure sensors from ECE shop?)
- [Stretch goal] Motor to fill and deflate air cell based on current pressure: [,]( [](

## Subsystem 2

Strap Adjustment Subsystem maintains and manipulates the straps on the cast which can be improperly tightened and this subsystem aims to prevent that by restoring straps to original tightness after cast is taken off
- Motor to tighten straps: (from ECE shop, doesn’t have to be fancy)
- Small electronic motor/lever component to unlatch the straps: (from ECE shop)
- Force sensor to detect the force of the straps on the cast for proper adjustment:
- ([](

## Subsystem 3

Control Subsystem creates and implements boot tightness presets
- Microcontroller (with Bluetooth connection to connect to app) to handle sensor data and control motors
- [](
- PCB - microcontroller will interact with sensors on PCB. Power control unit will be on PCB as well.
- Frontend display with preset options and ability to select one option which allows the user to remotely adjust the cast pressure level and strap tightness
- Display of pressure level and strap tightness amount for each preset option
- Allow remote adjustment of presets for doctor/patient

## Subsystem 4

Boot Subsystem
- (possibly one that Alice can borrow)
- Power supply/battery (depends on psi necessary for air pump inflation)

# Criterion For Success

* cast is auto adjusting
* can tighten and loosen without physical user manipulation
* pressure in air cast changes without physical user manipulation

* can be controlled using the app
* have presets for tightnesses
* able to create new presets

Healthy Chair

Ryan Chen, Alan Tokarsky, Tod Wang

Healthy Chair

Featured Project

Team Members:

- Wang Qiuyu (qiuyuw2)

- Ryan Chen (ryanc6)

- Alan Torkarsky(alanmt2)

## Problem

The majority of the population sits for most of the day, whether it’s students doing homework or

employees working at a desk. In particular, during the Covid era where many people are either

working at home or quarantining for long periods of time, they tend to work out less and sit

longer, making it more likely for people to result in obesity, hemorrhoids, and even heart

diseases. In addition, sitting too long is detrimental to one’s bottom and urinary tract, and can

result in urinary urgency, and poor sitting posture can lead to reduced blood circulation, joint

and muscle pain, and other health-related issues.

## Solution

Our team is proposing a project to develop a healthy chair that aims at addressing the problems

mentioned above by reminding people if they have been sitting for too long, using a fan to cool

off the chair, and making people aware of their unhealthy leaning posture.

1. It uses thin film pressure sensors under the chair’s seat to detect the presence of a user,

and pressure sensors on the chair’s back to detect the leaning posture of the user.

2. It uses a temperature sensor under the chair’s seat, and if the seat’s temperature goes

beyond a set temperature threshold, a fan below will be turned on by the microcontroller.

3. It utilizes an LCD display with programmable user interface. The user is able to input the

duration of time the chair will alert the user.

4. It uses a voice module to remind the user if he or she has been sitting for too long. The

sitting time is inputted by the user and tracked by the microcontroller.

5. Utilize only a voice chip instead of the existing speech module to construct our own

voice module.

6. The "smart" chair is able to analyze the situation that the chair surface temperature

exceeds a certain temperature within 24 hours and warns the user about it.

## Solution Components

## Signal Acquisition Subsystem

The signal acquisition subsystem is composed of multiple pressure sensors and a temperature

sensor. This subsystem provides all the input signals (pressure exerted on the bottom and the

back of the chair, as well as the chair’s temperature) that go into the microcontroller. We will be

using RP-C18.3-ST thin film pressure sensors and MLX90614-DCC non-contact IR temperature


## Microcontroller Subsystem

In order to achieve seamless data transfer and have enough IO for all the sensors we will use

two ATMEGA88A-PU microcontrollers. One microcontroller is used to take the inputs and

serves as the master, and the second one controls the outputs and acts as the slave. We will

use I2C communication to let the two microcontrollers talk to each other. The microcontrollers

will also be programmed with the ch340g usb to ttl converter. They will be programmed outside

the board and placed into it to avoid over cluttering the PCB with extra circuits.

The microcontroller will be in charge of processing the data that it receives from all input

sensors: pressure and temperature. Once it determines that there is a person sitting on it we

can use the internal clock to begin tracking how long they have been sitting. The clock will also

be used to determine if the person has stood up for a break. The microcontroller will also use

the readings from the temperature sensor to determine if the chair has been overheating to turn

on the fans if necessary. A speaker will tell the user to get up and stretch for a while when they

have been sitting for too long. We will use the speech module to create speech through the

speaker to inform the user of their lengthy sitting duration.

The microcontroller will also be able to relay data about the posture to the led screen for the

user. When it’s detected that the user is leaning against the chair improperly for too long from

the thin film pressure sensors on the chair back, we will flash the corresponding LEDs to notify

the user of their unhealthy sitting posture.

## Implementation Subsystem

The implementation subsystem can be further broken down into three modules: the fan module,

the speech module, and the LCD module. This subsystem includes all the outputs controlled by

the microcontroller. We will be using a MF40100V2-1000U-A99 fan for the fan module,

ISD4002-240PY voice record chip for the speech module, and Adafruit 1.54" 240x240 Wide

Angle TFT LCD Display with MicroSD - ST7789 LCD display for the OLED.

## Power Subsystem

The power subsystem converts 120V AC voltage to a lower DC voltage. Since most of the input

and output sensors, as well as the ATMEGA88A-PU microcontroller operate under a DC voltage

of around or less than 5V, we will be implementing the power subsystem that can switch

between a battery and normal power from the wall.

## Criteria for Success

-The thin film pressure sensors on the bottom of the chair are able to detect the pressure of a

human sitting on the chair

-The temperature sensor is able to detect an increase in temperature and turns the fan as

temperature goes beyond our set threshold temperature. After the temperature decreases

below the threshold, the fan is able to be turned off by the microcontroller

-The thin film pressure sensors on the back of the chair are able to detect unhealthy sitting


-The outputs of the implementation subsystem including the speech, fan, and LCD modules are

able to function as described above and inform the user correctly

## Envision of Final Demo

Our final demo of the healthy chair project is an office chair with grids. The office chair’s back

holds several other pressure sensors to detect the person’s leaning posture. The pressure and

temperature sensors are located under the office chair. After receiving input time from the user,

the healthy chair is able to warn the user if he has been sitting for too long by alerting him from

the speech module. The fan below the chair’s seat is able to turn on after the chair seat’s

temperature goes beyond a set threshold temperature. The LCD displays which sensors are

activated and it also receives the user’s time input.

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