7. Case 05: Wipers

7.1. Purpose


  • To build a wiper.

../../_images/Ringbit_Bricks_Pack_case_en_05_01.png

7.2. Materials


../../_images/Ringbit_Bricks_Pack_case_en_05_02.png

7.3. Background Knowledge


7.4. Bricks build-up


../../_images/Ringbit_Bricks_Pack_step_05_01.png

../../_images/Ringbit_Bricks_Pack_step_05_02.png

../../_images/Ringbit_Bricks_Pack_step_05_03.png

../../_images/Ringbit_Bricks_Pack_step_05_04.png

../../_images/Ringbit_Bricks_Pack_step_05_05.png

../../_images/Ringbit_Bricks_Pack_step_05_06.png

../../_images/Ringbit_Bricks_Pack_step_05_07.png

../../_images/Ringbit_Bricks_Pack_step_05_08.png

../../_images/Ringbit_Bricks_Pack_step_05_09.png

../../_images/Ringbit_Bricks_Pack_step_05_10.png

../../_images/Ringbit_Bricks_Pack_step_05_11.png

../../_images/Ringbit_Bricks_Pack_step_05_12.png

../../_images/Ringbit_Bricks_Pack_step_05_13.png

../../_images/Ringbit_Bricks_Pack_step_05_14.png

../../_images/Ringbit_Bricks_Pack_step_05_15.png

../../_images/Ringbit_Bricks_Pack_step_05_16.png

../../_images/Ringbit_Bricks_Pack_step_05_17.png

../../_images/Ringbit_Bricks_Pack_step_05_18.png

../../_images/Ringbit_Bricks_Pack_step_05_19.png

../../_images/Ringbit_Bricks_Pack_step_05_20.png

../../_images/Ringbit_Bricks_Pack_step_05_21.png

../../_images/Ringbit_Bricks_Pack_step_05_22.png

A detailed assembly instruction can be downloaded via the below links: Githubdownload

7.5. Software


MicroSoftmakecode

7.6. Code


Step 1

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

../../_images/Ringbit_Bricks_Pack_case_en_05_03.png

In order to programme for the Ring:bit Bricks Pack, we need to add an extension. Click “Extensions” at the bottom of the drawer. Search “servo” in the dialogue box to download it.

../../_images/Ringbit_Bricks_Pack_case_en_05_04.png

Note: If you met a tip indicating codebase will be deleted due to incompatibility, you may continue as the tips tell or build a new project.

Step 2

While button A being pressed, set the servo connected to P0 port turning 180 degrees; while buttom B being pressed, set the servo connected to P0 port turning 90 degrees.

../../_images/Ringbit_Bricks_Pack_case_en_05_05.png

Note: As the servo we used is in 360 degrees, the “servo” extension in MakeCode is suitable for servos in 180 degrees, therefore, setting the turning angle to 0 degree or 180 degrees will lead to the servo turning clockwisely or anti-clockwisely, and 90 degrees means to stop turning.

Code

Link: https://makecode.microbit.org/_6Pvbj1fPt33f

You can also download it directly below:

### Result --- When button A being pressed, the wiper begins working; while buton B being pressed, the wiper stops working.

7.7. Exploration


7.8. FAQ


7.9. Relevant File


Parallelogram mechanism: the two cranks as well as the connecting rod and frame are equal in length, their rotation speed and direction are in consistent.

Reciprocating motion: back and forth on both sides near a certain position.

The displacement of the reciprocating motion is equal to 0 because it is a positive stroke and a negative stroke. Mostly used in mechanical movements, such as pendulum, piston movement, etc.