每日彙整: 2018-12-08

樹莓派、樹莓派之學習、樹莓派之教育

樹莓派 3A+ 好好玩︰Sense Hat 後

即使一個簡單的『模擬器』︰

 

打開了範例之後︰

 

不知道眉角，恐不會『跑』哩！

略作摸索試誤，發現 【Run】選單裡的

Run Module F5

是所求呦☺

 

【模擬器畫面變化】

 

而後驗之以『命令列』

pi@raspberrypi:~ python3 humidity-2018-12-05-15-56-20.py  </pre>    <span style="color: #666699;">果然 OK 也☆</span>  <span style="color: #666699;">想當然耳，該先打開『模擬器』吧★</span> <pre class="lang:default decode:true ">pi@raspberrypi:~ python3 humidity-2018-12-05-15-56-20.py 
/usr/lib/python3/dist-packages/sense_emu/sense_hat.py:91: Warning: No emulator detected; spawning sense_emu_gui
  warnings.warn(Warning('No emulator detected; spawning sense_emu_gui'))
Traceback (most recent call last):
  File "humidity-2018-12-05-15-56-20.py", line 12, in <module>
    humidity = sense.humidity
  File "/usr/lib/python3/dist-packages/sense_emu/sense_hat.py", line 630, in humidity
    return self.get_humidity()
  File "/usr/lib/python3/dist-packages/sense_emu/sense_hat.py", line 621, in get_humidity
    self._init_humidity()  # Ensure humidity sensor is initialised
  File "/usr/lib/python3/dist-packages/sense_emu/sense_hat.py", line 604, in _init_humidity
    raise OSError('Humidity Init Failed')
OSError: Humidity Init Failed

 

可以開始讀讀 Sense-Emu 文件，玩玩範例了◎

Examples

Introduction

The Sense HAT emulator exactly mirrors the official Sense HAT API. The only difference (required because both the emulator and actual library can be installed simultaneously on a Pi) is the name:sense_emu instead of sense_hat. It is recommended to import the library in the following manner at the top of your code:

from sense_emu import SenseHat
 Then, when you want to change your code to run on the actual HAT all you need do is change this line to:
from sense_hat import SenseHat
 To run your scripts under the emulator, first start the emulator application, then start your script.

Several example scripts, with varying degrees of difficulty, are available from the File ‣ Open example menu within the emulator. Selecting an example from this menu will open it in Python’s IDLE environment.

Note

The example will be opened directly from the installation. To edit the example for your own purposes, use File ‣ Save As in IDLE to save the file under your home directory (e.g. /home/pi).