Stop at given length from the wall - Revision history

Mol: Marked this version for translation

2020-09-15T16:17:08Z

Marked this version for translation

← Older revision		Revision as of 19:17, 15 September 2020
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	<translate>		<translate>

	=== Introduction ===		=== Introduction === <!--T:1-->

			<!--T:2-->
	Often it is important to stop the robot if it sees an obstacle. The ultrasonic (or infrared) sensor is a suitable tool for that.		Often it is important to stop the robot if it sees an obstacle. The ultrasonic (or infrared) sensor is a suitable tool for that.

	=== Robot ===		=== Robot === <!--T:3-->

			<!--T:4-->
	Any robot (with tires or treads, perhaps walking robots too) will work.		Any robot (with tires or treads, perhaps walking robots too) will work.

	=== Sensors ===		=== Sensors === <!--T:5-->

			<!--T:6-->
	The ultrasonic (distance) sensor is used. The sensor is attached to port number 4.		The ultrasonic (distance) sensor is used. The sensor is attached to port number 4.

	=== Example Videos ===		=== Example Videos === <!--T:7-->

			<!--T:8-->
	<youtube>r8FcMB5bwhA</youtube>		<youtube>r8FcMB5bwhA</youtube>

	=== Theory ===		=== Theory === <!--T:9-->

			<!--T:10-->
	The ultrasonic sensor is a sonar radar that works similar to that of the bats. You should check the performance of the sensor in advance, specially if it is not working properly. A hand might be a not optimal device for checking -- you should use something more solid, eg. plastic of cardboard. The maximum working distance is about 2 meters, and the smallest distance is about 10 cm.		The ultrasonic sensor is a sonar radar that works similar to that of the bats. You should check the performance of the sensor in advance, specially if it is not working properly. A hand might be a not optimal device for checking -- you should use something more solid, eg. plastic of cardboard. The maximum working distance is about 2 meters, and the smallest distance is about 10 cm.

	=== Example Code ===		=== Example Code === <!--T:11-->

			<!--T:12-->
	[[File:Stop10cm.png\|thumb\|The code that stops the robot when in a proximity of a wall.]]		[[File:Stop10cm.png\|thumb\|The code that stops the robot when in a proximity of a wall.]]

	=== Exercises ===		=== Exercises === <!--T:13-->

			<!--T:14-->
	* Make the robot speed dependent on the distance to the wall, e.g. by using a formula speed = distance.		* Make the robot speed dependent on the distance to the wall, e.g. by using a formula speed = distance.
	* Use the ideas shown in previous part (Following a Line) to follow the wall at 10 cm apart.		* Use the ideas shown in previous part (Following a Line) to follow the wall at 10 cm apart.
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	* Use the ultrasonic sensor to listen if there is other robots using ultrasonic sensors.		* Use the ultrasonic sensor to listen if there is other robots using ultrasonic sensors.

			<!--T:15-->
	[[File:Ultrasonic.png\|\| Listen]]		[[File:Ultrasonic.png\|\| Listen]]


			<!--T:16-->
	This course is supported by [https://meet-and-code.org/ Meet and Code]. The course is made in collaboration with [http://www.fllsuomi.org/ Robotiikka- ja tiedekasvatus ry].		This course is supported by [https://meet-and-code.org/ Meet and Code]. The course is made in collaboration with [http://www.fllsuomi.org/ Robotiikka- ja tiedekasvatus ry].
	[[File:MeetAndcodeLogo.png\|thumb]]		[[File:MeetAndcodeLogo.png\|thumb]]

			<!--T:17-->
	[[Meet_and_Code_2020_I:_Ev3-G \| Back to Meet and Code 2020 I: Ev3-G]]		[[Meet_and_Code_2020_I:_Ev3-G \| Back to Meet and Code 2020 I: Ev3-G]]

	</translate>		</translate>

Mol at 16:16, 15 September 2020

2020-09-15T16:16:57Z

← Older revision		Revision as of 19:16, 15 September 2020
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	<translate>		<translate>

Mol at 16:16, 15 September 2020

2020-09-15T16:16:34Z

← Older revision		Revision as of 19:16, 15 September 2020
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			<languages>

			<translate>

	=== Introduction ===		=== Introduction ===

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	[[Meet_and_Code_2020_I:_Ev3-G \| Back to Meet and Code 2020 I: Ev3-G]]		[[Meet_and_Code_2020_I:_Ev3-G \| Back to Meet and Code 2020 I: Ev3-G]]

			</translate>

Mol at 16:15, 15 September 2020

2020-09-15T16:15:31Z

← Older revision		Revision as of 19:15, 15 September 2020
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	=== Introduction ===		=== Introduction ===

			Often it is important to stop the robot if it sees an obstacle. The ultrasonic (or infrared) sensor is a suitable tool for that.

	=== Robot ===		=== Robot ===

Mol: /* Example Code */

2020-09-15T16:14:25Z

Example Code

← Older revision		Revision as of 19:14, 15 September 2020
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	=== Example Code ===		=== Example Code ===

	[[File:Stop10cm.png\|thumb]]		[[File:Stop10cm.png\|thumb\|The code that stops the robot when in a proximity of a wall.]]

	=== Exercises ===		=== Exercises ===

Mol: /* Theory */

2020-09-15T16:13:50Z

Theory

← Older revision		Revision as of 19:13, 15 September 2020
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	=== Theory ===		=== Theory ===

	The ultrasonic sensor is a sonar radar that works similar to the bats. You should check the performance of the sensor specially if it is not working properly. A hand might be a not optimal device for checking -- ~~You~~ should use something ~~harder~~, eg. plastic of ~~cardboad~~. The maximum working distance is about 2 meters, and the smallest distance is about 10 cm.		The ultrasonic sensor is a sonar radar that works similar to that of the bats. You should check the performance of the sensor in advance, specially if it is not working properly. A hand might be a not optimal device for checking -- you should use something more solid, eg. plastic of cardboard. The maximum working distance is about 2 meters, and the smallest distance is about 10 cm.

	=== Example Code ===		=== Example Code ===

Mol: /* Example Videos */

2020-09-10T21:00:31Z

Example Videos

← Older revision		Revision as of 00:00, 11 September 2020
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	=== Example Videos ===		=== Example Videos ===

			<youtube>r8FcMB5bwhA</youtube>

	=== Theory ===		=== Theory ===

Mol: /* Sensors */

2020-09-10T20:56:56Z

Sensors

← Older revision		Revision as of 23:56, 10 September 2020
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	=== Sensors ===		=== Sensors ===

	The ultrasonic (distance) sensor is used.		The ultrasonic (distance) sensor is used. The sensor is attached to port number 4.

	=== Example Videos ===		=== Example Videos ===

Mol: /* Example Code */

2020-09-10T20:56:24Z

Example Code

← Older revision		Revision as of 23:56, 10 September 2020
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	=== Example Code ===		=== Example Code ===

			[[File:Stop10cm.png\|thumb]]

	=== Exercises ===		=== Exercises ===

Mol at 18:16, 5 September 2020

2020-09-05T18:16:41Z

← Older revision		Revision as of 21:16, 5 September 2020
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	=== Exercises ===		=== Exercises ===

	* ~~Ex 1~~		* Make the robot speed dependent on the distance to the wall, e.g. by using a formula speed = distance.
	* Use the ideas shown in previous part (Following a Line) to follow the wall at 10 cm apart.		* Use the ideas shown in previous part (Following a Line) to follow the wall at 10 cm apart.
	* Follow a line (previous part) until the robot finds a wall at 10 cm apart from the wall.		* Follow a line (previous part) until the robot finds a wall at 10 cm apart from the wall.