Until the first sound echo returns to the sensor, it will have a value of -1. Ultrasonic Range FinderUltrasonic Range Finder detects objects in a cone field of viewSensor detects object distance from the center of the sensorSensor distance calculations based on sound wavesObjects that may not be detectable include soft objects that absorb sound, sharp objects that deflect sound, etc.ĭo not use the ultrasonic sensor as the very first command of a program.
UltrasonicHow it WorksSimilar to how bats and submarinessense distanceDigital sensor that returns distance values between 0 and 255 inchesReturns values of -1 or -2 if used improperl圜ortex resolution can be in inches, cm, or mm Presentation NameCourse NameUnit # Lesson #.# Lesson Name9Quadrature Shaft EncodersHow it WorksDigital counting sensorInner shaft spins as the encoder countsCapabilities and Resolution360 counts per revolutionCounts up and downAllows you to control the distance a robot moves by monitoring how much the wheels spin The potentiometer will continue to function but will have a dead zone where the mechanical stops were.
VEX ROBOTICS ROBOTC FULL
PotentiometersHow it WorksAnalog sensorMeasures rotation of a shaft between 0 and ~265 degreesCortex returns values 0 - ~4095CautionInternal mechanical stops prevent potentiometer from turning a full revolutionExcess torque against the internal mechanical stops will cause them to wear awayĮxcess torque against the internal mechanical stops (can be caused by hand or by a VEX motor) will cause them to wear away. VEX Sensors SubsystemProvide inputs to sense the environment Optical Shaft Encoder-Ultrasonic Range Finder To plug into 2-9, use the Motor Controller 29.Presentation NameCourse NameUnit # Lesson #.# Lesson Name6VEX Motion Subsystem ServosSimilar in appearance to the 3-wire motorVery different in operationRotates between 0 and 120 degreesMotor is set to a power value Servo is set to a position value-127 = 0 degrees, 0 = 60 degrees, 127 = 120 degrees, etc.Natural Language commandsetServo()Servo motors can be programmed exactly the same way as normal motors in ROBOTC, so the programmer must know the hardware and the intended use.Presentation NameCourse NameUnit # Lesson #.# Lesson Name7Analog Sensors:-Light Sensorĭigital Sensors:-Bumper Switch -Limit Switch Two-wire motors can be plugged directly into MOTOR ports 1 and 10 on the Cortex. VEX Motion Subsystem Motors2-wire motor 269Two methods to connect to CortexMotor ports 1 and 10Motor port 2-9 using Motor Controller 292-wire motor 393 VEX Motion SubsystemComponents which make a robot moveGearsWheelsMotorsServos Refer to the Inventors Guide shown in the teacher notes for more details.Presentation NameCourse NameUnit # Lesson #.# Lesson Name3VEX Structure SubsystemMetal components directly attached using 8-32 screws and nutsNylock nuts have a plastic insert to prevent them from unscrewingKEPS nuts have a ring of teeth on one side to grip the piece being installedRegular nuts have no locking feature This is a very brief overview of the VEX robotics platform. gridAllows for VEX parts to be connected in almost any configuration VEX Structure SubsystemVEX Structure Subsystem forms the base of every robotContains square holes (0.182 in. VEX Robotics Platform and ROBOTC SoftwareIntroductionVEX Robotics Platform:Testbed for Learning Programming
VEX ROBOTICS ROBOTC SOFTWARE
VEX Robotics Platform and ROBOTC Software
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