- Wang Qiuyu (qiuyuw2)
- Ryan Chen (ryanc6)
- Alan Torkarsky(alanmt2)
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.
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
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.