EV3 Sensors

EV3 Sensors

1. Touch

   • Code blocks
     • wait until pressed
     • is pressed?
   • Uses
     • Detects if button is pressed
       • Potential use: stop robot if touch sensor hits object
   • Limitations
     • Touch sensor is very small
       • Wheels or superstructure could hit object and not be detected
     • Can only be placed on one side of the robot
       • Further limits range
     • Object has to push button in very deep before its detected
       • In certain situations objects will not be detected e.g. if motors are too weak to propel robot into object hard enough

2. Ultrasonic

   • Uses
     • Detects Distance
       • potential use: stop robot before x distance
   • Limitations
     • Cannot detect further away than ~100cms
     • Sensor has a very narrow angle of detection-- wheels could get stuck on objects etc.
     • Can only detect infront of robot
   • Code blocks
     • wait until distance is less/more than x distance
     • is distance less/more than x distance
     • distance in cm/inches

3. Light

   • Uses
     • Detects colour
       • Potential use: turn right if detects colour black
     • Detects light
       • Reflected
       • Ambient
   • Limitations
     • Can on be placed on one side of the robot
       • Limits range
     • Sensor is very small
       • Limits range
     • Sometimes accuracy may be reduced by difference in shadow/lighting/placement
       • Reduces consistency
   • Code blocks
     • Is reflected light intensity less/more than x?
     • Wait until colour is x
     • Is colour x?
     • Is ambient lighting more/less than x?

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