advanced mechatronics

ARCH 746 Interactive Prototype DesignIPD 516 Advanced Mechatronics

Assignment_2: Body Scanner

Andrew Tam (Eng)Bo Rin Jung (Arch)David Simpson (Eng)Furion Huang (Arch)Kate Rufe (Arch)

Idea : Mask

Predator Battlestar Galactica_Cylon Star Wars_Darth Vader

Concept : Play with Traditional Mask

Korean Traditional Mask North American Traditional Mask

Concept : Play with Mask

“I’m your father!” “May the force be with you.” “Hm, You’re not my son.”

Concept Design_1

LED inside a horn

Detecting Sensor

LED inside a horn

Korean Traditional Mask

Concept Design_2

Prototype 1 : Scanner Holder

Front holder

Connector

Back holder with strap

Prototype 1: Scanner Holder with Strap

Scanner holder model

Scanner holder testing

Prototype 1: Circuit

The circuit board takes in +12V to power the scanner. This then goes through a 5V regulator to power the MAEVARM. We also take in an input of -6V which goes through at -5V regulator. This -5V is used in an inverting offset LM-358 op-amp to gain the scanner signal from the approximate -1V mean to a 2.5V mean. The gain of this op-amp is controlled by two separate potentiometers; one for the actual gain while the other controls the input offset voltage. On the side, the ultrasonic sensor input comes through a molex pin connector while supplying the sensor power at the same time. A similar molex pin connector exists for the main scanner body as well. This is built this way so that the main circuit board can be mounted on the person’s chest or back while the ultrasonic can be mounted far away from the circuit board on the mask. The ultrasonic sensor and scanner signal are both read into the MAEVARM ADC which then transmits it wirelessly to another MAEVARM wireless module. This wireless module sends the ADC values into MATLAB using serial communication. These signal are then read into MATLAB where this data is merged with the image processing to create our data output.

The image processing is done through a Logitech webcam. A red and blue fiducial is used for tracking which gives us both posi-tion x,y and directionality. The z position is given via an ultrasonic sensor and the intensity of the signal from the scanner is also measured. The images recorded from the webcam are sent to matlab in real time and processed using a code which extracts x,y and the direction vector. This data is then used to plot in three dimension a square facing a par-ticular direction. The color of the square is based on the intensity of the signal with blue being least in-tense and red being most intense.

Prototype 1 : Mask Making