Ev3 Robot sensors

Ev3 Robot sensors

1. Light

   • Limitation/Constraints
     • May not be accurate and can be faulty when placed incorrectly at angles
     • The colour sensor is positioned to the side of the robot so it can only detect the colour directly below the sensor and not directly below the robots body
   • Algorithm examples
     • "If colour is red then ---"
     • "If ambient light intensity is greater than 50 then ---"
     • "Wait until colour is red"
   • The light sensor (aka colour sensor) is a digital sensor that detects colour or light intensity.
   • This sensor can be used in three different modes: Colour mode, Reflected Light Intensity mode, and Ambient Light Intensity mode.

2. Touch

   • Limitations/Constraints
     • The touch sensor has to be pressed in fully for the robot to actually process the input
     • The touch sensor is on the side so for smaller or thinner objects, such as poles, will not work.
   • The touch sensor that can detect when the red sensor button has been pressed and when it is released.
   • Algorithm examples
     • "Repeat until touch sensor is pressed"
     • "If touch sensor is pressed then ---"
   • Is relevant to three conditions: pressed, released, and bumped (both pressed and released)

3. Ultrasonic

   • Limitations/Contraints
     • The sensor depends on reflection of sound waves, meaning it may not work at detecting certain surfaces (e.g Textured and rounded surfaces)
     • It is limited to detecting objects infront of it
   • Algorithm examples
     • "Wait until distance is less than 15cm"
     • "If distance is less than 15cm then---"
   • The Ultrasonic sensor is a digital sensor which measures the distance to an object in front
   • Distance can be measured in cm or inches