NXT2.0 Sensor DataLego NXT 1.0 Light Sensor Data
All four challenge events have tape laid on the floor to serve as marker points and contestants may wish to use this tape to assist in navigating their robots. The Lego light sensor measures the intensity of reflected light and the measured value can be used by the robot program to detect the presence of tape and to decide what type of tape it is.
The measurements listed below were taken in the Queanbeyan Conference Centre of the floor, the white masking tape and the aluminium tape to assist contestants in setting up program values. Note that these values were measured using our lego robot. They could vary slightly for different machines and at different times. Each team should measure their own values at the venue on the competition day to ensure their threshold values are correct.
Light Sensor Measurement Setup
|
Parquet Floor Values |
White Masking Tape Values |
Aluminium Tape Values |
|
|
42 |
51 |
67 |
|
|
42 |
51 |
76 |
|
|
40 |
52 |
73 |
|
|
39 |
51 |
77 |
|
|
41 |
53 |
73 |
|
|
42 |
52 |
73 |
|
|
41 |
51 |
73 |
|
|
43 |
50 |
73 |
|
|
40 |
51 |
68 |
|
|
43 |
51 |
|
|
|
40 |
|
|
|
|
41 |
|
|
|
|
43 |
|
|
|
|
44 |
|
|
|
|
39 |
|
|
|
|
38 |
|
|
|
|
43 |
|
|
|
|
45 |
|
|
|
|
45 |
|
|
|
|
39 |
|
|
|
|
|
|
|
|
|
45 |
53 |
77 |
Max |
|
39 |
50 |
67 |
Min |
Lego NXT2.0 Colour Sensor Data
All challenge events have tape laid on the floor to serve as marker points and contestants may wish to use this tape to assist in navigating their robots. The Lego colour sensor measures the intensity of reflected light and the measured value can be used by the robot program to detect the presence of tape and to decide what type of tape it is.
The measurements listed below were taken in the Queanbeyan Conference Centre of the floor, the white masking tape and the aluminium tape to assist contestants in setting up program values. Note that these values were measured using our lego robot. They could vary slightly for different machines and at different times. Each team should measure their own values at the venue on the competition day to ensure their threshold values are correct.
Reflected light figures for each of the three colours are provided below. These figures were collected using the tri-bot configuration and a short program that measured the three reflected light levels and displayed them on the screen. Download the program here if you wish to try it.
Colour Sensor Measurement Setup
|
Parquet Floor Values |
White Masking Tape Values |
Aluminium Tape Values |
|
||||||
|
Red |
Green |
Blue |
Red |
Green |
Blue |
Red |
Green |
Blue |
|
|
19 |
82 |
11 |
34 |
29 |
29 |
48 |
44 |
56 |
|
|
25 |
10 |
13 |
36 |
30 |
30 |
48 |
56 |
57 |
|
|
25 |
11 |
13 |
35 |
29 |
30 |
45 |
41 |
54 |
|
|
19 |
70 |
10 |
35 |
30 |
30 |
53 |
44 |
62 |
|
|
26 |
12 |
12 |
34 |
29 |
28 |
51 |
45 |
56 |
|
|
18 |
72 |
11 |
34 |
28 |
29 |
50 |
45 |
55 |
|
|
26 |
12 |
13 |
35 |
29 |
29 |
51 |
46 |
56 |
|
|
20 |
71 |
10 |
35 |
29 |
29 |
54 |
47 |
60 |
|
|
25 |
11 |
13 |
|
|
|
|
|
|
|
|
29 |
12 |
13 |
|
|
|
|
|
|
|
|
24 |
11 |
12 |
|
|
|
|
|
|
|
|
18 |
61 |
10 |
|
|
|
|
|
|
|
|
24 |
10 |
13 |
|
|
|
|
|
|
|
|
19 |
90 |
12 |
|
|
|
|
|
|
|
|
24 |
10 |
11 |
|
|
|
|
|
|
|
|
29 |
90 |
13 |
36 |
30 |
30 |
54 |
56 |
62 |
Max |
|
18 |
10 |
10 |
34 |
28 |
28 |
45 |
41 |
54 |
Min |
It is recommended that either red or blue light be used for measuring reflected light levels as these allow the three different materials to be distinguished. Don’t use green light because the range of values for the parquet floor encompasses the other two materials and there is no way of distinguishing one from the other.