Sensors

How does the robot see?

Some types of sensors

• Limit Switches - detects contact
• Camera - provides sight
• Encoders - measures rotational or linear motion
• Ultrasonic - measures distances
• Gyroscope - measures orientation
• Processed Vision - measures target's distance, angle, and offset from robot
• For more info on sensors see: High Tech High Top Hat Technicians - Electrical Tutorial

Limit Switch	Grayhill brand Quadrature Encoder	Kauai Labs navX Gyro/ Accelerometer

Knowledge Check

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#

Which sensor type is used to measure the robot's orientation?

Limit switch

Encoder

Ultrasonic

Gyroscope

A gyroscope measures orientation — which direction the robot is facing. This is used for field-relative driving so the robot can move correctly regardless of which way it is pointed.

#

Which type of sensor would you use to measure the distance between the robot and an object?

Camera

Limit switch

Ultrasonic

Encoder

Ultrasonic sensors measure distances. Limit switches detect contact, cameras provide sight, and encoders measure rotational or linear motion — not raw distance to an object.

#

A limit switch is used to detect physical contact, such as a mechanism reaching the end of its travel.

True

False

As listed on this page, limit switches detect contact. They are one of the simplest sensors available and are commonly used to tell the robot when a mechanism has reached a physical stop.

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