test and observation vehicle billing system
Different test was performed to check the outcome of the system and different errors. These tests gave the various observations. Some are as follows:
Experiment
No.
|
Actual distance travelled(A)
(meter)
|
Distance
showed by system(B)
(meter)
|
A-B
(meter)
|
Percentage
error(e)
((A-B)/A)*100
(%)
|
1
|
10
|
9.06
|
0.04
|
0.4
|
2
|
10
|
10
|
0
|
0
|
3
|
10
|
10.03
|
0.03
|
0.3
|
4
|
10
|
10
|
0
|
0
|
5
|
10
|
10.09
|
0.09
|
0.9
|
Table 5.1: Distance measured
Mean
percentage error (emean) = (0.4+0+0.3+0+0.9)/5
=
0.32%
Similarly
for the tilt measurement:
Experiment
No.
|
Actual tilt(A)
(degree)
|
Tilt
showed by the system(B)
(degree)
|
A-B
(degree)
|
Percentage
error(e)
((A-B)/A)*100
(%)
|
1
|
45
|
45
|
0
|
0
|
2
|
47
|
45
|
2
|
4.2
|
3
|
42
|
45
|
2
|
7.1
|
4
|
42
|
45
|
2
|
7.1
|
5
|
45
|
45
|
0
|
0
|
Table 5.2: Tilt measured
Mean
percentage error (emean) = (0+4.2+7.1+7.1)/5
=
3.68%
As
we can see that the values achieved was not exactly correct but
tentatively equal. There exist some errors. The error in the distance
calculation was about 0.32% where as the error in case of tilt
measurement was about 3.68%.5.2 Result
Above observations drew following result:
· For actual distance of 10 meter, the observed mean distance for five samples was 9.836 meter with an mean error of 0.32%
· For mean tilt of 44.67 degree in four samples , the observed tilt was 45 degree with an error of 3.68%
Similarly the received latitude and longitude was recorded in SD card as a CSV file along with date and time. These values were also displayed in the LCD.
Figure 5.1: Sample of CSV File Stored in SD card
Figure 5.2: Longitude value Displayed in LCD
5.3 Discussion
The output of the above mentioned experiments and their relative errors were discussed along with their reasons and solutions.
There were mean error of 0.32% in distance measurement. This might be due to incapability to measure the exact latitude and longitude or due to incapability of latitude and longitude to show the exact point on the surface of the earth.
Let,
Distance travelled = 5 km.
Rate = 20 rs per km.
Total charge = 20*5
= 100 rs
Considering the error of +0.32%
Distance displayed = 5.016 km
Total charge = 5.016*20
= 100.32 rs
Additional amount paid = 0.32 rs
The error was not handled properly as there was not much difference in the fare due to such errors when overall distance was to be calculated.
Similarly about 3.68% error in the tilt measurement may be due to the delay in measuring the tilt of the vehicle. This error was also unhandled as such a small deviation was not a problem in case of real vehicle.
Different results were displayed in LCD at a time. So, a single 16x2 alphanumeric display was enough. There was no need of scrolling. Similarly, latitude longitude values were stored in SD card. Since we have used a SD card slot, card of varying capacity can be used according to need.
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