Upload
chris-mcadams
View
251
Download
0
Tags:
Embed Size (px)
DESCRIPTION
immersive kinematics
Citation preview
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)
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.