Real Time Embedded System Development part-4.pptx

Camera Parameters:
Logitech Live Cam
Height=176
Width=144
Frames=10

Four Cameras Live Streaming On BeagleBoard

Task Done:
 Interfaced USB GPS Receiver to the Beagleboard.
Successfully installed a navigation software “Navit” on
Beagleboard which shows the GPS location on OSM
maps.
Navit automatically generates the route information
from current location to the destination.
Also Navit gives audio prompts (like take right/left
turn) to assist the driver during the journey.
GPS Module

Route map from current position to a destination

DRIVER SAFETY PERFORMANCE
INDEX DETERMINATION BASED
ON ACCELEROMETER

Hardware requirements
 Beagleboard C4.
 USB Accelerometer.
 SD Card.
 USB Camera.
 LCD Touch screen.
USB GPS Receiver.

Software requirements
 Linux kernel - 2.6.34 version
 Mobile OS - Angstrom
Compiler - ARM
 Tools - Gnuplot, E-Speak, FFmpeg

Accelerometer
Electromechanical device that will measure
acceleration.
It is a sensor.
Its value does not change at uniform speed.
Accelerometer Selection
Dynamic Range
Sensitive axis
Size and Mass
Output

USB based Accelerometer module - EK302DL

Block diagram of Accelerometer module -
EK302DL

 E-Speak Speech Synthesizer
E-Speak is a compact open source software speech
synthesizer for English and other languages, for Linux.
Using e-speak command
$ "echo Welcome Please wear your seatbelt Have a safe
journey | espeak -s150 --stdin"
 FFmpeg Tool
FFmpeg is a complete solution to record, convert and stream
audio and video.
 We can record videos by giving the command
$ ffmpeg –t 10 –f video4linux2 –s 320x240 –i /dev/video0
/home/root/vid1.avi

Accelerometer X, Y & Z directions when
mounted in a car
$GPRMC,001724.042,V,…150209,,N*44
GPS data

Application Program
 Initialize the accelerometer module
 Save the accelerometer readings along with time stamp.
 Compare the accelerometer readings with predefined threshold
values of the events and if exceeded then generate voice
prompts, text prompts, record video and evaluate the
performance index.
 Plot the graph for accelerometer readings at the end of the
journey.

Flow chart for application program
Configure the serial port to
communicate with accelerometer
module
Start
Receive the data(3-axis readings) from
the accelerometer
Play the voice prompt, displays
the text prompt, logs the GPS
data and record the video for a
specified time
Initialize the communication with the
accelerometer
Assign the data to the variables x,y,z
B
A
mCompare the readings with
predefined threshold
e
If the readings are
greater than
threshold

B
Save the accelerometer readings along
with time stamp
Stop
A
Uninitialize the Accelerometer module
Plot the graph using Gnuplot for the
saved Accelerometer readings
If any user
interrupt
Evaluate the performance index and
give driver ratings

Event Classification
The Events which are occurred after exceeding the threshold
value are classified into two events which can determine the
performance of the driver and give ratings.
 Soft Events
The events which occur after threshold value has been exceeded,
slightly degrade the performance of the driver.
 Hard Events
The events which occur after threshold value has been exceeded,
may lead to an accident and can be considered as worst driving.

Thresholds for Accelerometer Readings
S.No Event Occurred Threshold
X Y Z
1 Sudden Soft Acceleration +4 to +8 -3 to +3 +60 to +70
2 Sudden Hard Acceleration +9 to +15 -3 to +3 +60 to +70
3 Sudden Soft Deceleration -8 to -4 -3 to +3 +60 to +70
4 Sudden Hard Deceleration -15 to -9 -3 to +3 +60 to +70
5 Normal Forward 0 to +3 -3 to +3 +60 to +70
6 Normal Reverse -3 to 0 -3 to +3 +60 to +70
7 Left Turn -3 to +3 -15 to -3 +60 to +70
8 Right Turn -3 to +3 +3 to +15 +60 to +70
9 Soft Left Turn -3 to +3 -21 to -16 +60 to +70
10 Hard Left Turn -3 to +3 -30 to -22 +60 to +70
11 Soft Right Turn -3 to +3 +16 to +21 +60 to +70
12 Hard Right Turn -3 to +3 +22 to +30 +60 to +70

Project setup of USB Accelerometer, USB Camera,
USB GPS receiver, Speakers, Interfacing with
Beagleboard

Accelerometer Program Initialization
LCD displaying the text prompt “Welcome please wear your seat
belt, have a safe journey” when the Accelerometer program is
initialized.

Normal readings in the 3-axis of Accelerometer
LCD displaying the readings of the accelerometer in the
3 – axis X, Y and Z respectively with the timestamp.

Sudden Acceleration Detection, Soft Event
LCD displaying that “You are suddenly accelerating the
vehicle , Soft Event”
Where X = +6 , Y = +2 , Z = +70.

Sudden Acceleration Detection, Hard Event
Lcd displaying that “You are suddenly accelerating the vehicle ,
Hard Event”
Where X = +13 , Y = -3 , Z = +64.

Sudden Deceleration Detection , Soft Event
Lcd displaying that “You are decelerating the vehicle, Event”
Where X = -7 , Y = -2 , Z = +68.

Sudden Deceleration Detection , Hard Event
LCD displaying that “You are decelerating the vehicle, Hard
Event”
Where X = -12 , Y = +2 , Z = +61.

Normal Reverse Detection
Lcd displaying that “You are moving in reverse direction normal
acceleration”
Where X = -3 , Y = 0 , Z = +69.

Camera Recording when Event Occurred
LCD displaying the recording process with the camera,
displaying the recording time.

Graph Plotted for Accelerometer Readings
LCD displaying the graph in X, Y and Z axis. Where we can
see the sudden change in Y- axis while taking a hard right
turn.

Performance Index with out any Events
LCD displaying the “Performance Index with out any events
and rating of the driver is 10”

Performance Index with Events
LCD displaying the “Performance Index with certain events
occurred and rating of the driver is 9”

Logged GPS data
LCD displaying the GPS data file of the hard right turn
event.

Real Time Embedded System Development part-4.pptx

More Related Content

Similar to Real Time Embedded System Development part-4.pptx

More from golajapu jyothsna

Recently uploaded

Real Time Embedded System Development part-4.pptx