PROGRESS 12: SENSOR TESTING 2

SENSOR TESTING BY USING OSCILLOSCOPE

Same as testing by using multimeter, the sensor tested by using oscilloscope to get the frequency (kHz) with 100% output frequency scaling (fo).

Before performing the test, the sensor had been covered by a wall with 0.7 cm height. The wall functioning to prevent the light from LED's to be directed towards the sensor. In other word, the sensor will only detect the reflection of light from colour paper. The frequency range and frequency average was determined. The frequency range determined by the position of the paper colour (closest and far of the sensor).

Figure 12.1: Sensor Covered with 0.7 cm height.

RED

Figure 12.2: Red Colour Paper

Figure 12.3: Min Frequency = 7.021 kHz

Figure 12.4: Max Frequency = 17.12 kHz

S0	S1	S2	S3	Frequency Range (kHz)	Frequency Average (kHz)
H	H	L	L	7 – 17	12

Table 12.1: Result for Red Colour Paper

BLUE

Figure 12.5: Blue Colour Paper

Figure 12.6: Min Frequency = 8.300 kHz

Figure 12.7: Max Frequency = 22.32 kHz

S0	S1	S2	S3	Frequency Range (kHz)	Frequency Average (kHz)
H	H	L	H	8 – 22	15

Table 12.2: Result for Blue Colour Paper

GREEN

Figure 12.8: Green Colour Paper


Figure 12.9: Min Frequency = 5.051 kHz

Figure 12.10: Max Frequency = 12.99 kHz

S0	S1	S2	S3	Frequency Range (kHz)	Frequency Average (kHz)
H	H	H	H	5 – 13	9

Table 12.3: Result for Green Colour Paper

S0

S1

S2

S3

Frequency Range (kHz)

Frequency Average (kHz)

H

H

L

L

7 – 17

12

S0

S1

S2

S3

Frequency Range (kHz)

Frequency Average (kHz)

H

H

L

H

8 – 22

15

S0

S1

S2

S3

Frequency Range (kHz)

Frequency Average (kHz)

H

H

H

H

5 – 13

9