RaspberryPiのadafruit_blinkaでSense_HATのセンサーにアクセスする

2020/3/29

Rpi adafruit_blinka Sense HAT

Rpi adafruit_blinka Sense HAT

概要

RaspberryPiのadafruit_blinkaライブラリでcircuitpythonのAPIを使ってSense_HATのセンサーにアクセスする。 Sense_HATのセンサーのアクセスはSense_HATのライブラリでできるが、ここでは、adafruit_blinkaライブラリのテストとしてSense_HATのセンサーにアクセスする。Sense_HATのセンサーとして以下があるので、それに対するアクセスをテストすることになる。

I2C address	Device
0x5c	LPS25H(Pressure/Temperature)
0x1c	LSM9DS1(IMU (Accelerometer and Magnetometer))
0x5f	HTS221(Humidity/Temperature)
0x6a	LSM9DS1(IMU (Accelerometer and Magnetometer))
0x46	LED2472G(今回は使用しない)

adafruit_blinkaのインストールについては以下のリンクを参照のこと：

RaspberryPiのpython3でCircuitPythonのAPIを使用する

該当モジュールのインストール方法

Module Install:

  pip3 install adafruit-circuitpython-lps2x
  pip3 install adafruit-circuitpython-lsm9ds1
  pip3 install adafruit-circuitpython-hts221

  

Demo Script(動作確認)

demo script:
lps2x_HAT_test.py

  import time
  import board
  import busio
  import adafruit_lps2x

  i2c = busio.I2C(board.SCL, board.SDA)
  lps = adafruit_lps2x.LPS2X(i2c, address=0x5c)
  while True:
      print("Pressure: %.2f hPa" % lps.pressure)
      print("Temperature: %.2f C" % lps.temperature)
      print("")
      time.sleep(1)

  

出力例：
LPS25H(lps2X)

  $ python3 lps2x_HAT_test.py 
  Pressure: 1018.85 hPa
  Temperature: 17.60 C

  Pressure: 1018.84 hPa
  Temperature: 17.62 C

  Pressure: 1018.72 hPa
  Temperature: 17.64 C

  

demo script:
lsm9ds1_HAT_test.py

  # Simple demo of the LSM9DS1 accelerometer, magnetometer, gyroscope.
  # Will print the acceleration, magnetometer, and gyroscope values every second.
  import time
  import board
  import busio
  import adafruit_lsm9ds1

  # I2C connection:
  i2c = busio.I2C(board.SCL, board.SDA)
  sensor = adafruit_lsm9ds1.LSM9DS1_I2C(i2c,xg_address=0x6a,mag_address=0x1c)

  # SPI connection:
  # from digitalio import DigitalInOut, Direction
  # spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
  # csag = DigitalInOut(board.D5)
  # csag.direction = Direction.OUTPUT
  # csag.value = True
  # csm = DigitalInOut(board.D6)
  # csm.direction = Direction.OUTPUT
  # csm.value = True
  # sensor = adafruit_lsm9ds1.LSM9DS1_SPI(spi, csag, csm)

  # Main loop will read the acceleration, magnetometer, gyroscope, Temperature
  # values every second and print them out.
  while True:
      # Read acceleration, magnetometer, gyroscope, temperature.
      accel_x, accel_y, accel_z = sensor.acceleration
      mag_x, mag_y, mag_z = sensor.magnetic
      gyro_x, gyro_y, gyro_z = sensor.gyro
      temp = sensor.temperature
      # Print values.
      print(
          "Acceleration (m/s^2): ({0:0.3f},{1:0.3f},{2:0.3f})".format(
              accel_x, accel_y, accel_z
          )
      )
      print(
          "Magnetometer (gauss): ({0:0.3f},{1:0.3f},{2:0.3f})".format(mag_x, mag_y, mag_z)
      )
      print(
          "Gyroscope (degrees/sec): ({0:0.3f},{1:0.3f},{2:0.3f})".format(
              gyro_x, gyro_y, gyro_z
          )
      )
      print("Temperature: {0:0.3f}C".format(temp))
      print("")
      # Delay for a second.
      time.sleep(1.0)


  

出力例：
LSM9DS1(lsm9ds1)

  $ python3 lsm9ds1_HAT_test.py 
  Acceleration (m/s^2): (-2.947,6.827,6.356)
  Magnetometer (gauss): (-0.431,0.330,-0.180)
  Gyroscope (degrees/sec): (286.676,-194.495,285.128)
  Temperature: 17.500C

  Acceleration (m/s^2): (-2.955,6.819,6.273)
  Magnetometer (gauss): (-0.425,0.335,-0.185)
  Gyroscope (degrees/sec): (3.159,0.516,0.508)
  Temperature: 17.500C

  

demo script:
hts221_HAT_test.py

  import time
  import board
  import busio
  import adafruit_hts221

  i2c = busio.I2C(board.SCL, board.SDA)
  hts = adafruit_hts221.HTS221(i2c) # _HTS221_DEFAULT_ADDRESS = 0x5F
  while True:
      print("Relative Humidity: %.2f %% rH" % hts.relative_humidity)
      print("Temperature: %.2f C" % hts.temperature)
      print("")
      time.sleep(1)

  

出力例：
HTS221(hts221)

  $ python3 hts221_HAT_test.py 
  Relative Humidity: 52.47 % rH
  Temperature: 16.71 C

  Relative Humidity: 52.38 % rH
  Temperature: 16.75 C

  Relative Humidity: 52.33 % rH
  Temperature: 16.80 C

  

demo script:
disp_press_tempe.py

  # Adafruit_Blinka/sense_hat coexistence test
  import time
  import board
  import busio
  import adafruit_lps2x

  i2c = busio.I2C(board.SCL, board.SDA)
  lps = adafruit_lps2x.LPS2X(i2c, address=0x5c)

  #-------------------------------------

  from time import sleep
  from sense_hat import SenseHat

  sense = SenseHat()

  while True:
    print("Pressure: %.2f hPa" % lps.pressure)
    print("Temperature: %.2f C" % lps.temperature)
    print("")
    sense.show_message("Press:{:.2f} Tempe:{:.2f} ".format(lps.pressure,lps.temperature), text_colour=[255, 0, 0])

  

demo script:
disp_question_mark.py

  # Adafruit_Blinka/sense_hat coexistence test
  import time
  import board
  import busio
  import adafruit_lps2x

  i2c = busio.I2C(board.SCL, board.SDA)
  lps = adafruit_lps2x.LPS2X(i2c, address=0x5c)

  #-------------------------------------

  from time import sleep
  from sense_hat import SenseHat

  sense = SenseHat()


  O = [0, 0, 0]  # LED off
  zeros = [
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, O, O, O, O, O
  ]


  X = [255, 0, 0]  # Red
  O = [255, 255, 255]  # White
  question_mark = [
  O, O, O, X, X, O, O, O,
  O, O, X, O, O, X, O, O,
  O, O, O, O, O, X, O, O,
  O, O, O, O, X, O, O, O,
  O, O, O, X, O, O, O, O,
  O, O, O, X, O, O, O, O,
  O, O, O, O, O, O, O, O,
  O, O, O, X, O, O, O, O
  ]

  sense.set_pixels(zeros)
  sleep(4)

  sense.set_pixels(question_mark)

  DELAY = 0.5
  while True:
    print("Pressure: %.2f hPa" % lps.pressure)
    print("Temperature: %.2f C" % lps.temperature)
    print("")
    #------------------
    sense.rotation = 0
    sleep(DELAY)
    sense.rotation = 90
    sleep(DELAY)
    sense.rotation = 180
    sleep(DELAY)
    sense.rotation = 270
    sleep(DELAY)

  

Adafruit_CircuitPython_Bundleのモジュールのインストール方法

  # MODULEというモジュールをインストールする場合、以下を実行する：
  pip3 install adafruit-circuitpython-MODULE
  # python3でimportする場合のスクリプト
  import adafruit_MODULE
  # ダッシュ(-)とアンダースコア(_)の使い分けに注意すること

  # 実例：
  pip3 install adafruit-circuitpython-neopixel_spi
  # スクリプト例：
  import adafruit_neopixel_spi

  # インストールしたモジュールは以下のディレクトリに置かれる
  $ ls $HOME/.local/lib/python3.7/site-packages/*.py

  /home/pi/.local/lib/python3.7/site-packages/adafruit_gps.py
  /home/pi/.local/lib/python3.7/site-packages/adafruit_hts221.py
  /home/pi/.local/lib/python3.7/site-packages/adafruit_lps2x.py
  /home/pi/.local/lib/python3.7/site-packages/adafruit_lsm9ds1.py
  /home/pi/.local/lib/python3.7/site-packages/adafruit_pypixelbuf.py
  /home/pi/.local/lib/python3.7/site-packages/analogio.py
  /home/pi/.local/lib/python3.7/site-packages/bitbangio.py
  /home/pi/.local/lib/python3.7/site-packages/board.py
  /home/pi/.local/lib/python3.7/site-packages/busio.py
  /home/pi/.local/lib/python3.7/site-packages/digitalio.py
  /home/pi/.local/lib/python3.7/site-packages/micropython.py
  /home/pi/.local/lib/python3.7/site-packages/neopixel_spi.py
  /home/pi/.local/lib/python3.7/site-packages/neopixel_write.py
  /home/pi/.local/lib/python3.7/site-packages/pulseio.py

  

circuitpythonボードで、これらのモジュールを使用する場合、上のファイルをボードのflashにコピーすることになる。

LEDマトリクス(補足)

今回のセンサーには関係ないが、LEDマトリクスは、フレームバッファ/dev/fb1にマッピングされているので、以下のコマンドでも制御できる：

  # clear
  cat /dev/zero | head -c 128 > /dev/fb1

  # random
  cat /dev/urandom | head -c 128 > /dev/fb1
  

参照情報

Raspberry Pi Sense Hat
Sense HAT API Reference

Pinout for Sense HAT

RaspberryPiのpython3でCircuitPythonのAPIを使用する

CircuitPython on Linux and Raspberry Pi
CircuitPython 5.0.x - I2C

以上