Welcome to World of Module Sensor Kit repository
5.7 Sunflower
Note: Please use the double-headed data cable provided by us to connect the Micro:bit board and expansion board to the computer, otherwise it will not be possible to drive the servo due to insufficient power.
1. Learning target
In this lesson, we will use the micro:bit board, building blocks and sensor modules to build a sunflower. We can use the joystick to control the photosensitive module up, down, left, and right, or press the button to let the sunflower automatically track the brightest light.
2. Servo calibration
Before assembling the building blocks, we need to use code to calibrate the servo to a fixed angle.
If calibration is not calibrated before using, it is easy to jam the servo during use and cause the steering gear to stall and damage the servo.
Calibration method:
2.1 Connect the brown line of the servo to GND (black), the red line of the servo to VCC (red), and the yellow line of the servo to IO on expansion board.
The bottom servo is connected to P1, and the upper servo is connected to P10. As shown below.
2.2 Then connect the computer to the Micro:bit board and expansion board through the double-head micro USB cable we provided.
2.3 Download the servo calibration code (Servo-calibration-Sunflower.hex) to the micro:bit board.
2.4 When a "7" pattern is displayed on the dot matrix of the Micro:bit board, it means the servo be calibrated successfully.
3. Building blocks assembly
Please follow the steps we provide to assemble the building block models.
Pay attention to the installation direction of the servo when assembling, otherwise the servo will be damaged due to the wrong angle of the servo after running the program.
After the assembly is completed, please check the wiring of the servo as shown below.
4. About wiring
5.Programming method
Mode 1 online programming: First, we need to connect the micro:bit to the computer by USB cable. The computer will pop up a USB flash drive and click on the URL in the USB flash drive: http://microbit.org/ to enter the programming interface. Add the Yahboom package https://github.com/YahboomTechnology/Module-World to program.
Mode 2 offline programming: We need to open the offline programming software. After the installation is complete, enter the programming interface, click【New Project】, add Yahboom package: https://github.com/YahboomTechnology/Module-World , you can start programming.
6. Code
Please the hex file we provided.
7. Experimental phenomena
After the program is downloaded successfully. We can use the joystick to control the photosensitive module up, down, left, and right, or press the button to let the sunflower automatically track the brightest light.