Demo4-v1.0 - Demo 4 Line Sensor —a The scribbler has two...

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Unformatted text preview: Demo 4: Line Sensor —a The scribbler has two pairs of infrared emitters and detectors on its underside. With them, it can see a black line on white paper. Print out a set of black lines from the Scribbler software CD (file name: Tracks.pdf). For a view of what the printed tracks look like, see page 18 of this booklet. it Draw your own tracks by making a black line % inch (2 cm) wide, on white paper. To do this you will need: white paper 0 a black marker l W51 protect surfaces with paper when Strument with your Scribbler. Be aware l Paper andstain the surface beneath, While holding your finger on the left light sensor, press and release the reset button. When you hear the beep, uncover the light sensor. Place the Scribbler on the paper, and move it back and forth across the black line. If the right sensor sees the line, the right green LED will light up. If the left sensor sees the line, the left green LED will light up. If both sensors see the line, both green LEDs light up. The Scribbler must be resting on the paper to see the line. ...
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