Self-Adjusting Jacket ECE 445 SP2017

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Presentation transcript:

Self-Adjusting Jacket ECE 445 SP2017 TA : Kexin Hui Team #76 Haoyu Wu Michael Hou Chuan xie

During certain times of the year, the outdoor temperature varies a lot throughout the day.

Introduction The goal of the project is to make a jacket that can sense the temperature of current environment and adjust the “thickness” of itself automatically. To adjust the thickness of jacket, we will use the insulating property of air.

High Level Requirements Battery Life 4 AA batteries can sustain and provide the electricity of the whole system for at least two hours. Temperature Range The system will automatically adjust the thickness of the jacket when a temperature change greater than 1 degree occurs Thermal Insulation When the air pockets are filled with air at an appropriate level, the user will feel warm in an environment lower than 10 celsius.

Block Diagram

Main Body Consists of the air bags, an air valve, and an air pump. All components as air-tight as possible. Serves as the insulating thermal layer.

Air Bags Flexible, foldable, and light weight Min. height = 1.95cm R-value = 0.87

Insulating property of Air Gasses like air do not transfer heat very well because the molecules are so far apart from each other. R-value of Air = 0.87 at 1.95cm Recommend R value for skiing is around 1.7

Air Pump SIZE VS POWER Max Voltage is 6V Pump the air bag to Desired height of around 2cm in 150 seconds

Sensing Unit Temperature Sensor Temperature Sensor senses the current environment temperature Motion Sensor Motion sensor measures whether the jacket is currently being worn Pressure Sensor Measures the air pressure inside the air pockets

Motion Sensor Infrared Motion sensor Max distance - 3M Detect Condition: The temperature difference between the target and the surroundings must be higher than 4 degree Movement Speed: 1.0m/s Target Concept: Human Body with approx size of 700x250 mm

Pressure/Temperature Sensor High Unit Cost $16 Small size - 3.3 x 3.3 x 2.75 mm 1.8 x 0.8 mm O-ring ( Fit our tubes)

Temperature Sensor Resistance Temperature Detector Temperature Increases, Resistance Increases

Control System Interpret the input from sensors Receives data from user interface Control the air valve and air pump

Control Logic 3 Inputs Motion sensor Temperature sensor User interface 2 Outputs Air pump Air valve Story for illustration purposes only

Microcontroller AnalogRead Map 0-3v into integer values between 0-1023. 0.0029 v per unit DigitalWrite Output voltage 3.3v

Interpret Analog Readings Room temperature average - 23 °C Temperature reading starting point - 676 Reading begin to drop as we touch the temperature sensor (very slowly) 37 °C - 480

Temperature Sensor Readings Time ( seconds) Value Temperature ( °C ) 676 23.2 45 636 25.8 90 593 28.6 135 551 31.4 180 513 34.2 225 480 37

Damaged Pressure Sensor Use clock cycle instead Delay(500) each cycle - 0.5 seconds 150s - a counter to 300

Power Unit 4 AA batteries provides 6V voltage Use voltage regulator to get 3.3v to feed the sensors Support the whole system for at least 2 hours

Circuit Components Temperature Sensor Motion Sensor Motor Valve Microcontroller Airbag Voltage Regulator

Future Work Redesign air bags to wrap around a jacket Wifi Capability Using rechargeable batteries Small LED panel indicating the temperature and the percent of air which is filled in the air bags

End of Presentation. Thank you for watching and listening. Team # 76