# Case 10: Fall-arrest TPBot ## 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. ## Material --- - 1 x [TPBot](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-tpbot-car-kit-without-micro-bit-board?_pos=1&_sid=f32828112&_ss=r) ![](./images/TPBot_tianpeng_case_01_01.png) ## Software --- [MicroSoftmakecode](https://makecode.microbit.org/#) ## Programming --- - Click "Advanced" to see more choices in the MakeCode drawer. ![](./images/TPBot_tianpeng_case_01_02.png) - 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. ![](./images/TPBot_tianpeng_case_01_03.png) ### Sample - 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%. ![](./images/TPBot_tianpeng_case_10_04.png) ### Link - Link: [https://makecode.microbit.org/_dtPhXL3XxTJC](https://makecode.microbit.org/_dtPhXL3XxTJC) - You may also download it directly below:
### Conclusion - 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. ## Exploration --- ## 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. ## Relevant File ---