Forward Until Near Stop when near a wall.

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Presentation transcript:

Forward Until Near Stop when near a wall

NXT Ultrasonic Sensors

NXT Ultrasonic Sensors How does the Ultrasonic Sensor detect distance? The ultrasonic Sensor sends out a high-frequency sound pulse and times how long it takes for the echo of the sound to be reflected back. Since the speed of sound is known, the sensor uses rate and time to calculate the distance.

Forward Until Near Program

Motor Block One Details

Ultrasonic Block Two Details

Motor Block Three Details

Test Your Robot Stop when near a wall

Backward Until Far Back away from the wall until a specified distance is achieved

Backward until Far Ultrasonic Block Two Details Wait for the Ultrasonic Sensor on Port 4 to get a Far reading Far = Ultrasonic Sensor value > Threshold value

Test Your Robot Back away from the wall until a specified distance is achieved