64. Case 63: The Intelligent Pitching Machine#

64.1. Introduction#

In daily life we can see ball pitching machines in some amusement park. They are in very large sizes and basically can’t be installed in a home for fun. To make it available, we can use our Nezha Inventor’s kit to make an intelligent ball pitching machine. We will use an AI lens to identify the card, and if it is the card that we set to recognize, program to lauch the ball. At the same time, the four-digit digital tube will record the number of times the ball is launched. This work sounds very interesting, let’s get started.

../../_images/63_1.png

Materials Required#

Nezha expansion board × 1

micro:bit V2 × 1

AI Lens × 1

Seven-segment 4-digit digital tube × 1

360° Servo × 2

Red Card × 1

Leather straps × 2

RJ11 cables × 2

Bricks × n

Note: If you want all of the above components, you may purchase the Nezha 48 IN 1 Inventor’s Kit.

Assembly Steps#

Component Details

../../_images/63_2.jpg

Build it as the assembly steps suggest:

../../_images/63_3.jpg

../../_images/63_4.jpg

../../_images/63_5.jpg

../../_images/63_6.jpg

../../_images/63_7.jpg

../../_images/63_8.jpg

../../_images/63_9.jpg

../../_images/63_10.jpg

../../_images/63_11.jpg

../../_images/63_12.jpg

../../_images/63_13.jpg

../../_images/63_14.jpg

../../_images/63_15.jpg

../../_images/63_16.jpg

../../_images/63_17.jpg

../../_images/63_18.jpg

../../_images/63_19.jpg

../../_images/63_20.jpg

../../_images/63_21.jpg

../../_images/63_22.jpg

../../_images/63_23.jpg

../../_images/63_24.jpg

../../_images/63_25.jpg

../../_images/63_26.jpg

../../_images/63_27.jpg

../../_images/63_28.jpg

../../_images/63_29.jpg

../../_images/63_30.jpg

64.2. Connection Diagram#

Connect the servo to S1, S2 and the AI Lens to IIC port, then connect the Seven-segment 4-digit digital tube to J1 port.

../../_images/63_36.png

64.3. MakeCode Programming#

Step 1#

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

../../_images/49_10.png

For programming the servo, we need to add a package. Click “Extensions” at the bottom of the drawer and search with “nezha” to download it.

../../_images/49_11.png

For programming the AI Lens and 7 Segment four-digit digital tube sensor, we need to add a package. Search with “PlanetX” in the dialogue box and click to download it.

../../_images/49_12.png

Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Reference#

The program is shown below:

../../_images/63_32.jpg

Link: https://makecode.microbit.org/_KbYhPgeR4J6f

You may also download it directly:

Result#

We can see that when a red card is placed in front of the AI lens, the pitcher fires a small ball and then the four-digit digital tube displays the number of the pitches.

../../_images/63_33.gif