02

03

1. Posture of looking at the blackboard

2. Posture of writing

1. Children who grow faster2. Old-type desks and chairs become

unsuitable

Develop an incorrect sitting habit

In classroom

1. Doing homework

2. Using computer

3. Playing on-line gamesSitting too long

•Affecting blood circulation

•A lack of exercises

Causing obesity

At home

Research

Improper sitting posture consequences

Pressure to back bone

• Damage of Cardiorespiratoryfunction

• Short sight

• Retention of urine

• Back pain

Sitting Habits

Shift of C.O.G. no support on hip

Shift of C.O.G. When tilting

Pressure Sensor

Soft mat

Stress point

Concepts

1

Backrest distance changed

Hip contact undetected

B

AC

Back pillow

IR sensor

IR beam

Concepts

2

3 4

Back pillow

Distance measuringIR sensor

Soft mat

Backrest distance changed

Hip contact undetected

Pressure sensor

ON/OFF

Backrest distance changed

Hip contact detected

5

Concepts

Sketches

Ercogonomic

Design Features

Simple Easy operation Fit for the chair

Effective Calibration for three modes Retain users custom

Comfortable High ventilation Ergonomic design

User friendly Washable cover Clear user interface

End user Health

Maintain proper sitting posture Rest

Comfort No body attachment Ergonomic design

Customers Monitor Education assistance

Design Features

Design Features

Design Features

3 IR distance sensors

1 switch sensor

1 LED set (5 green LED)

1 button switch for LED 1 Micro-speaker 1 4-positions switch for On/Off + level

PCB

IR sensor

on/off

level switch

power

supply

LED on/off switch

LED

set

micro

speaker

pressure sensor

IR sensor

IR sensor

0

I

II

II

I

• Max. 10 pts (full marks)

• Min. 0 pts

• 5 pts at the beginning (first start/reset)

• +1 pt for sitting correctly over 15mins

• -1 pt for sitting incorrectly over 1min

Circus Design

Chiffon

Flannelette

Memory foam

• Back pillow thickness

– Fit with different computer chair backseats

• Material

– Highly ventilated materials; fabrics/ weaves

Colours & Materials

33.6

10

30

11

After making the prototype

Testing on children

Dimension modified

Front View

Isometric View

Side View

Top View

Foam Model

Detected by both sensors

Detected by IR

sensors

Wrong Sitting Postures

Detected by pressure button

By prototype for testing, 3 ranges can be defined

Short range 18 cm

Middle range 20 cm

Long range 22 cm

10 yearold children

18 cm

6 year old children

22 cm

Foam Model