fischertechnik ROBO Explorer Bedienungsanleitung Seite 28

R O B O R O B O R O B O
R O B O R O B O
The robot is to find a black line on a white background and then follow this line. To make this possible, you
have installed an IR trail sensor in your model. The module transmits a light in the infrared range to the
pavement surface. Depending on the background, this is reflected and measured by phototransistors. For
your programing, this means: A bright and white background reflects the light and you receive the value
1. With a black background, the light is not reflected and you receive the value 0. If both transistors have
the value 0, then the robot has found the lane (the black line) and must now follow this line.
Branching
Finished Program: Trail_searcher_1.rpp
Motor output
Buzzer
short stretch along the line. However, because it cannot yet readjust, it leaves the marking and stops and
sends you a signal indicating this.
Now it looks better already. Your robot remains precisely on the prescribed trail. In an industrial building,other
robots would remove the load, which was transported, at the end of the trail or would give the robot a new
load. This load could then be transported back to the starting point of the trip.
Finished Program: Trail_searcher_2.rpp
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E E E A A A A A
E E
X P L O R E R X P L O R E R X P L O R E R X P L O R E R X P L O R E R
Now, how is the model to function?
Task 1 - ROBO Pro Level 2
Your tracked vehicle is to be placed on a straight black trail and then travel along this.
If it loses the trail or if the trail ends, it is to stop and transmit an acoustic signal for one
second.
Subdivide the entire program into a main program for the sensor interrrogation and a
subprogram for the travel straight ahead, one for the buzzer signal and one for stop.
A Few Little Tips:
Use the interface test to check the trail identification by the sensor. If the black-white identification
does not function properly, then interferring light sources such as the sun could be the cause. If
necessary, the sensor must be positioned somewhat closer to the trail or be shielded with a building
board.
Of course, you will not be satisfied with your first solution because your robot can certainly travel a
Task 2 - ROBO Pro Level 2
Expand your main program in the interrogation branches of the phototransistors so that
the robot recognizes when it is not traveling exactly on the trail. Then, it is to
correct the direction of travel accordingly. You can find a tip in the left program
section.
B B B B B
C T I V I T Y C T I V I T Y C T I V I T Y C T I V I T Y C T I V I T Y O O K L E T O O K L E T O O K L E T O O K L E T O O K L E T