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Build the IR Sensor Circuits

In this activity, you will build and test the infrared object sensor system to make sure they detect objects in front of the ActivityBot. Just like the whisker circuits, there is one on the right and one on the left so the ActivityBot can determine which way to turn in relation to the obstacle. 

In this case, each side needs two electronic components: an LED that rapidly flashes infrared light, and an infrared receiver to detect a reflection of that infrared light bouncing off of objects nearby.

Build the Ping))) Bracket and Circuit

The Build

  • Build and test your cyber:bot, following all tutorials up to Navigation with the cyber:bot
  • Attach the Ping))) sensor and Mounting Bracket Kit to your cyber:bot, following the directions that come with the kit.
    • The Ping))) Sensor plugs into servo header pin 16 on the cyber:bot board.
    • Mounting bracket standard servo plugs into servo header 17 on the cyber:bot board.
  • Center the Ping))) Mounting bracket on the servo horn.

Test the IR Sensor Circuits

The test code displays the state of each IR detector:  1 = no infrared reflection detected, 0 = yes, infrared reflected from an object is detected. 

 

Test Code

  • Log into your BlocklyProp account and create a new project named Test IR Detectors.
  • Build the project shown below, and save it.

Test the IR Sensor Circuits

The test code displays the state of each IR detector: 

  • 1 = no infrared reflection detected,
  • 0 = yes, infrared reflected from an object is detected. 

Before continuing, it is VERY important make sure that both sides can reliably detect objects. Otherwise, your robot won't be able to navigate, and you won't know if your circuits or your code is the problem.

 

 

Parts & Circuit

Parts

  • (1) Connected micro:bit, edge, and breadboard from Connect the micro:bit to a Breadboard
  • (1) USB cable
  • (2) Alligator clip test leads
  • (2) 3-pin headers
  • (1) jumper wire - red
  • (2) jumper wires - black
  • (1) jumper wire - blue
  • Gather the parts and get ready to build your micro:bit continuity tester!  

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