步驟1：製作
它是什麼？
Use your BBC micro:bit to measure distances as you walk.
您將學到什麼
This practical project shows how to use multiplication and variables to measure distances.
運作方式
- This program calculates distances by multiplying step length by the number of steps you take. It uses an average child's step length of 0.6 metres.
- Carefully walk the distance you want to measure, pressing button A each time you take a step.
- The program works by increasing the 'step count' variable by one each time button A is pressed.
- Press button B to see the distance you have walked in metres. The micro:bit calculates this by multiplying the 'step count' variable by the step length.
- If you want to know how many steps you took, press the touch logo on the front of your micro:bit.
- Reset the micro:bit by pressing the reset button on the back.
你需要的東西
- BBC micro:bit and battery pack
Step 2: code it
1# Imports go at the top
2from microbit import *
3import music
4
5stepcount = 0
6steplength = 0.6
7display.show(0)
8music.play(['c4:4'])
9
10while True:
11 if button_a.is_pressed():
12 music.play(['c3:2'])
13 display.show(Image.HEART)
14 sleep(400)
15 stepcount += 1
16 display.clear()
17 if button_b.is_pressed():
18 display.scroll(stepcount*steplength)
19 if pin_logo.is_touched():
20 display.scroll(stepcount)Step 3: improve it
- Calculate your average step length in metres and use it to replace the 0.6 number in the code.
- Calculate areas of rectangles, such as parts of a school playground, by measuring each side and multiplying the distances together.
- Add cardboard to make the buttons easier to press, as seen in the Improve it section of the Emotion badge project.
- Use this wheelchair distance calculator code that can automatically detect when your wheel rotates. Replace the 0.6 number with the circumference of your wheel measured in metres.
