Senior Project Design Review

pleasanthopebrothersΗλεκτρονική - Συσκευές

2 Νοε 2013 (πριν από 3 χρόνια και 1 μήνα)

61 εμφανίσεις

Senior Project Design Review

Remote Visual Surveillance
Vehicle (RVSV)


Manoj Bhambwani

Tameka Thomas

Project Description


Remote controlled vehicle with mounted Internet
camera


Both the vehicle and camera motion is controlled by
user via an Internet interface which sends the signal
through the serial port to a transceiver


Real
-
time video from the Internet camera is received
through the same interface via the Ethernet
connection to a wireless router

Project Design Introduction

The project design is split into the
following modules:


Radio Signal Processing


Transmission


this includes the Java Applet and the serial port
transceiver


Receiving


this includes the microcontroller and the transceiver
circuit which it controls


Vehicle Control


Camera Control


Obstacle Detection

Project Design: Transmission


The transceiver circuit includes a transceiver IC which
modulates and controls transmission of the desired signal, a
Max232 which converts the RS
-
232 signal to TTL logic and a RS
-
232 connector


This unit uses an AC wall adapter for the power supply in order
to minimize circuit and need for batteries


The Internet interface uses two java applets, one to display the
video and one to control the camera and vehicle movement



The video display applet is a feature of the Internet camera and is
not controlled by the user in any way


The motion control applet consists of a read
-
only text box and 8
buttons total, each button sends a separate control signal to the
serial port and the text box is to alert the user of any obstacles or
causes of an incomplete transaction

Project Design: Transmission,

Rough Draft GUI

Project Design: Transmission,

Final Draft GUI Concept

Project Design: Transmission,

Current Transmitter Module

Project Design: Receiving


The transceiver circuit consists of the transceiver
module and a microcontroller which processes the
signal


The microcontroller will determine what movement
is to be made and will take info from the obstacle
detection circuit to determine what moves can be
made


The microcontroller will also be in charge of
signaling back to the user via the transceiver if a close
obstacle has caused the vehicle not to move

Project Design: Receiving,
Current Receiver Module

Power Supply

Project Design: Receiving,
Microcontroller Design


Microcontroller will
process the data
received and will also
decide if the vehicle
movement can continue
to be made


For camera movement,
the microcontroller will
pass on information to
another microcontroller

Project Design:

Vehicle Control


Microcontroller used to control the vehicle is
the same as the one discussed in the previous
module


There are two motors being controlled


Drive motor


handles forward and backward
motion


Steering motor


handles left and right motion


Both motors are controlled using H
-
bridges


Power design used is same as the one
discussed in the previous module

Project Design: Vehicle
Control, Work in Progress

Project Design:

Camera Control


Microcontroller will control the servo motor
which will handle the camera movement


The camera will be mounted on top of the
servo, allowing it a 180º viewing range


The servo and microcontroller use the main
vehicle power supply and the camera has it’s
own


The power supply for the camera is
completed and is still being tested

Project Design: Camera
Control, Power Supply

Project Design:


Obstacle Detection


The obstacle detection circuit
uses the Sharp Distance
Measurement Sensor
(GP2D120) which outputs a
higher voltage based on the
closeness of the obstacle


The sensor connects the base
of a transistor which will
alert the microcontroller of
an obstacle by feeding it a
logic 0

Restrictions due to Design:
NOT SET IN STONE


The decision to use a servo motor for
the camera movement restricts our
viewing angle to only 180º


Operating range by specs will be
approximately 150 ft


Battery life so far, according to our
testing results, is 2 hours

Implementation & Test


Flow of implementation:


Serial Port Transceiver prototype


Vehicle Transceiver prototype


Interface vehicle transceiver with motion control


Interface all with camera motion control


Implement Obstacle detection and error encoding


Each step will include several levels of testing, where
applicable


Functional


Does it work?


Life


How long do I have the power?


Stress


How do I handle rough
-
housing?


Range


How far can I go?


Current Status


Summer Completion:


Camera Power Supply prototype built and currently
finishing testing


Functional testing for: transceivers, serial communication
(write only), obstacle detection, steering motor & camera
motion motor


First draft of Java Applet for serial communication


Currently working on:


Signal Encoding


Serial Communication, read & write


Microcontroller for receiver, vehicle & camera control


Drive & Steering motor


Vehicle power supply

Possible Showstoppers


Vehicle modification


due to the fact that mechanics
are our weakest point and that this is a redesign of an
existing vehicle frame, this could possible cause us
the most headache


Solution


ability to backtrack, purchased two vehicles so
that if one modification doesn’t work there is room for
redesign


Power, power, power


not really a showstopper, as
much as it is a “showpauser”


Solution


we’re currently working on various ideas on how
to minimize the amount of batteries needed

Questions, Comments,
Concerns…