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Week 13

 

 

Sensor testing was performed in the Power Electronics Lab with the help from the lab staff from the laboratory. 

 
The sensor left in the oven with a supply voltage of +5V, and its digital output Dout was connected directly to an oscilloscope outside the oven for the sensor’s high period T1 and low period T2 readings. In order to avoid errors, each time the reading was taken twice. An average value was chosen for the calculation of measured temperature. I summarized the results in the table below.
 

Oven Temp/°C

T1/ms

T2/ms

Measured Temp/°C

Temp Difference/°C

T1 - 1

T1 - 2

T1Ave

T2 - 1

T2 - 2

T2Ave

25

8.00

8.00

8.00

15.30

15.35

15.33

26.1908646

1.1908646

26

8.10

7.95

8.03

15.40

15.40

15.40

26.55844156

0.558441558

27

8.00

8.10

8.05

15.50

15.55

15.53

27.59259259

0.592592593

28

8.06

8.07

8.07

15.50

15.56

15.53

27.27301996

-0.726980039

29

8.06

8.00

8.03

15.60

15.63

15.62

29.30035223

0.300352225

30

7.99

8.00

8.00

15.65

15.66

15.66

30.72021718

0.720217183

31

8.00

8.05

8.03

15.75

15.80

15.78

31.51347068

0.513470681

32

8.00

8.07

8.04

15.80

15.90

15.85

32.22397476

0.223974763

33

8.00

7.99

8.00

15.90

15.95

15.93

34.18367347

1.183673469

34

8.00

8.02

8.01

16.00

16.03

16.02

34.93755854

0.937558539

35

8.04

8.03

8.02

16.04

16.03

16.05

35.12461059

0.124610592

36

8.01

7.99

8.00

16.06

16.05

16.07

35.87118855

-0.12881145

37

8.00

8.00

8.00

16.12

16.08

16.10

36.24223602

-0.757763975

38

8.00

8.02

8.01

16.23

16.18

16.20

37.22222222

-0.777777778

39

8.00

8.00

8.00

16.38

16.40

16.39

39.75899939

0.75899939

40

8.02

8.04

8.03

16.49

16.47

16.48

40.09708738

0.097087379

41

8.00

8.02

8.01

16.53

16.58

16.55

41.40483384

0.404833837

42

8.02

8.04

8.03

16.66

16.67

16.68

42.43405276

0.434052758

43

8.05

8.05

8.05

16.76

16.74

16.75

42.76119403

-0.23880597

44

8.05

8.07

8.06

16.79

16.81

16.80

43.0952381

-0.904761905

45

8.01

8.03

8.02

16.91

16.89

16.90

45.17751479

0.177514793

46

8.02

8.04

8.03

17.02

17.00

17.01

46.16990006

0.169900059

47

8.04

8.08

8.06

17.16

17.17

17.18

47.33993015

0.339930151

48

8.05

8.04

8.05

17.19

17.21

17.20

47.79069767

-0.209302326

49

8.04

8.03

8.04

17.26

17.30

17.28

48.88888889

-0.111111111

50

8.03

8.03

8.03

17.38

17.42

17.40

50.40229885

0.402298851

 
 
 
The result has shown that the readings for T1 are stable at around 8.00ms to 8.06ms, while for T2 readings, there is a slight increase from 15.3ms to 17.4ms for the temperature range of 25°C to 50°C. Also, the temperature errors are calculated by substracting the oven temperature from the calculated temperature, which is given by the equation Temperature(°C ) = 235 - (400 x T1) / T2, given by the datasheet of TMP04. The next step will be analyzing the temperature accuracy levels based on the experiment results and find the highest error percentage.
 
 
 
 
 
 
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