A simple delay at the beginning of your program solves this.Presentation NameCourse NameUnit # Lesson #.# Lesson Name12VEX Cortex (VEX 2.0)12 Digital Portsīumper SwitchLimit SwitchOptical Shaft EncoderUltrasonic Range FinderDigital PortsVEX Cortex (VEX 2.0)12 Digital Ports8 Analog InputsVEX Cortex MicrocontrollerĪnalog PortsVEX Cortex Microcontroller2 Wire 2692 Wire 393 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 returns distance values between 0 and 255 inches or the equivalent centimeters or millimetersReturns values of -1 or -2 if used outside of this range or if a return signal is not sensed Presentation NameCourse NameUnit # Lesson #.# Lesson Name9Optical Shaft EncodersHow It WorksDigital counting sensorInner shaft spins as the encoder measures angle of revolutionCapabilities and Resolution360 counts per revolutionCounts up and downThe distance which a robot moves can be controlled by monitoring the angle at which the wheels attached to the shaft encoder spin
The potentiometer will continue to function but will have a range between the positions where mechanical stops were located.
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PotentiometersHow It WorksAnalog sensorMeasures rotation of a shaft between 0 and ~265 degreesCortex returns values between 0 and ~4095ĬautionInternal 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 by hand or by a VEX motor will cause the stops to wear away. Optical Shaft EncoderUltrasonic Range FinderVEX Sensors SubsystemProvide inputs to sense the environment Presentation NameCourse NameUnit # Lesson #.# Lesson Name7Analog Sensors:Light Sensorĭigital Sensors:Bumper Switch Limit Switch Presentation NameCourse NameUnit # Lesson #.# Lesson Name6VEX Motion Subsystem ServosSimilar appearance to a motorOperation is significantly differentMotor spins continuously at a power value Servo rotates to a position between 0o to 120o degrees
A Motor Controller 29 is needed to connect to Cortex motor to port 2 9. MotorServoGearsWheelsVEX Motion Subsystem Motors2-wire motor 269 and 2-wire motor 393Two methods to connect to CortexMotor ports 1 and 10Motor port 2-9 using Motor Controller 292-Wire 2692-Wire 393Ĭontroller 29Two-wire motors connect directly to Cortex motor ports 1 and 10. NylockNutKEPSNutRegularNut8-32 screwsVEX Motion SubsystemComponents which make a robot moveGearWheelMotorServo Refer to the Inventors Guide shown in the student resources for more details.Presentation NameCourse NameUnit # Lesson #.# Lesson Name3VEX Structure SubsystemMetal components directly attached using 8-32 screws and nutsNylock nut has a plastic insert to prevent unscrewingKEPS nut has a ring of teeth on one side to grip the piece being installedRegular nut has no locking feature This is a very brief overview of the VEX robotics platform. gridAllows VEX components to be assembled in various configurations VEX Structure SubsystemVEX Structure Subsystem forms a robot baseContains square holes on a standardized in. Introduction to theVEX Robotics Platform and ROBOTC SoftwareĢ012 Project Lead The Way, Inc.Principles of EngineeringPresentation NameCourse NameUnit # Lesson #.# Lesson Name1VEX Robotics Platform:Testbed for Learning Programming
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Activity 3.1.1 VEX Robotics Platform and ROBOTC Software
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