13. Case 10: Fall-arrest TPBot#

13.1. Purpose#

  • Stick a black gummed paper to the edges of the table, programme to set the TPBot reversing if the black was detected and then it keeps moving forward.

13.2. Material#


13.3. Software#


13.4. Programming#

  • Click “Advanced” to see more choices in the MakeCode drawer.


  • We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “tpbot” in the dialogue box to download it.



  • Set an icon on the micro:bit display and the headlights in white.

  • Judge if the black line was detected in the forever brick, if yes, set the TPBot reversing for one second at the speed of 30% and then turning left for 0.5 second at the same speed; or it moves forward at the speed of 30%.



  • Power up to show an icon on the micro:bit display and set the TPBot moving forward with headlights in white. If the black line was detected, it reverses and then turns left to keep moving.

13.5. Exploration#

13.6. FAQ#

Q: The car does not work with the code in the wiki.
A: It should be the batteries that are lack of power, please try to fix it by adding the value of the speed in the code.

13.7. Relevant File#