More than 3 years have passed since last update.

Grove Pi+スターターキットのセンサを試す

Last updated at 2021-01-14Posted at 2020-01-04

概要

ハッカソンでRaspberry PiとGrove Pi+スターターキット、kintoneを活用することになり、Pythonで問題なく利用できるか調べました。結果、GitHubに公開しているgrovepi.pyには不具合があり修正する必要がありますが、付属センサは概ね利用できました。

Grove Pi+ スターターキット初心者向け Raspberry Pi A+,B,B+&2,3適用 CE認証（写真はGrove Pi本体）
https://shop.dexterindustries.com/grovepi-starter-kit-raspberry-pi/

Grove Pi+ の設定と試験環境

使用OS

Raspbian Buster with desktop
Version:September 2019
Release date:2019-09-26
Kernel version:4.19

使用ライブラリィ

library supports this fw versions: 1.3.0

以下の情報を参考に設定
https://www.dexterindustries.com/GrovePi/get-started-with-the-grovepi/setting-software/

（重要）ライブラリィ不具合の修正

以下の「Raspberry PiでGrove Pi+スターターキットとカメラを使う初期設定」の”Grove Pi+のライブラリィ不具合”を参照し、grovepi.py を修正。
https://qiita.com/yukataoka/items/9df2c74f7cd514e04b97#grove-pi%E3%81%AE%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA%E3%82%A3%E4%B8%8D%E5%85%B7%E5%90%88

試験環境

デフォルトのアカウント pi のルート（/home/pi）配下に、以下の手順で設定。

$ mkdir ~/pgm
$ cd ~/pgm
$ cp ~/Dexter/GrovePi/Software/Python/grovepi.py ~/pgm
$ cp ~/Dexter/GrovePi/Software/Python/grove_rgb_lcd/grove_rgb_lcd.py ~/pgm
$ python grovepi.py
library supports this fw versions: 1.3.0

Grove Pi+ スターターキット付属のセンサを試す

1.Example Project: LED Fade（LEDのフェード）

https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/
http://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/led-fade/
https://github.com/DexterInd/GrovePi/blob/master/Projects/LED_Fade/led_fade.py

センサ

コード

led_fade.py

import time
import grovepi

# Connect the Rotary Angle Sensor to analog port A2
potentiometer = 2

# Connect the LED to digital port D5
led = 5

grovepi.pinMode(led,"OUTPUT")
time.sleep(1)
i = 0

while True:
    try:
        # Read resistance from Potentiometer
        i = grovepi.analogRead(potentiometer)
        print(i)

        # Send PWM signal to LED
        grovepi.analogWrite(led,i//4)
        time.sleep(0.5)

    except KeyboardInterrupt:
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python led_fade.py
0
0
12
546
1023
1023
1023
945
0
0

2.Example Project: Button And Buzzer（ボタンブザー）

https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/
https://github.com/DexterInd/GrovePi/blob/master/Projects/Button_And_Buzzer/Button_And_Buzzer.py

センサ

コード

Button_And_Buzzer.py

import time
from grovepi import *
import math

buzzer_pin = 2      #Port for buzzer
button = 4      #Port for Button

pinMode(buzzer_pin,"OUTPUT")    # Assign mode for buzzer as output
pinMode(button,"INPUT")     # Assign mode for Button as input
while True:
    try:
        button_status= digitalRead(button)  #Read the Button status
        if button_status:           #If the Button is in HIGH position, run the program
            digitalWrite(buzzer_pin,1)                      
            print "Buzzing"
        else:                   #If Button is in Off position, print "Off" on the screen
            digitalWrite(buzzer_pin,0)
            print "Off"
                time.sleep(0.1)

    except KeyboardInterrupt:           # Stop the buzzer before stopping
        digitalWrite(buzzer_pin,0)
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python Button_And_Buzzer.py
Off
Off
Off
Buzzing
Buzzing
Off
Buzzing
Off
Off
Buzzing
Off
Buzzing
Off
Off

3.Example Project: Ultrasonic And Relay（距離センサとリレー）

https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/
https://github.com/DexterInd/GrovePi/blob/master/Projects/Ultrasonic_And_Relay/Ultrasonic_And_Relay.py

センサ

コード

Ultrasonic_And_Relay.py

import time
from grovepi import *

# Connect the Grove Ultrasonic Ranger to digital port D4
# SIG,NC,VCC,GND

ultrasonic_ranger = 4
Relay_pin = 2

pinMode(Relay_pin,"OUTPUT")
digitalWrite(Relay_pin,0)

while True:
    try:
        # Read distance value from Ultrasonic
        distant = ultrasonicRead(ultrasonic_ranger)
        print(distant,'cm')
        if distant <= 10:
            digitalWrite(Relay_pin,1)
        else:
            digitalWrite(Relay_pin,0)
        time.sleep(0.2)

    except KeyboardInterrupt:
        digitalWrite(Relay_pin,0)
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python Ultrasonic_And_Relay.py
(93, 'cm')
(92, 'cm')
(92, 'cm')
(9, 'cm')
(8, 'cm')
(9, 'cm')
(9, 'cm')
(93, 'cm')
(94, 'cm')
(93, 'cm')

4.Example Project: Home Weather Display（家の気温と湿度を表示）

https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/
https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/raspberry-pi-temperature-sensor/
https://github.com/DexterInd/GrovePi/blob/master/Projects/Home_Weather_Display/Home_Weather_Display.py

センサ

コード

Home_Weather_Display.py

from grovepi import *
from grove_rgb_lcd import *
from time import sleep
from math import isnan

dht_sensor_port = 7 # connect the DHt sensor to port 7
dht_sensor_type = 0 # use 0 for the blue-colored sensor and 1 for the white-colored sensor

# set green as backlight color
# we need to do it just once
# setting the backlight color once reduces the amount of data transfer over the I2C line
setRGB(0,255,0)
setText("")

while True:
    try:
        # get the temperature and Humidity from the DHT sensor
        [ temp,hum ] = dht(dht_sensor_port,dht_sensor_type)
        print("temp =", temp, "C\thumidity =", hum,"%")

        # check if we have nans
        # if so, then raise a type error exception
        if isnan(temp) is True or isnan(hum) is True:
            raise TypeError('nan error')

        t = str(temp)
        h = str(hum)

        # instead of inserting a bunch of whitespace, we can just insert a \n
        # we're ensuring that if we get some strange strings on one line, the 2nd one won't be affected
        setText_norefresh("Temp:" + t + "C\n" + "Humidity :" + h + "%")

        time.sleep(1)

    except (IOError, TypeError) as e:
        print(str(e))
        # and since we got a type error
        # then reset the LCD's text
        setText("")
        break

    except KeyboardInterrupt as e:
        print(str(e))
        # since we're exiting the program
        # it's better to leave the LCD with a blank text
        setText("")
        break

    # wait some time before re-updating the LCD
    sleep(0.05)

結果

$ python Home_Weather_Display.py
('temp =', 21.0, 'C\thumidity =', 57.0, '%')
('temp =', 21.0, 'C\thumidity =', 57.0, '%')
('temp =', 21.0, 'C\thumidity =', 56.0, '%')
('temp =', 21.0, 'C\thumidity =', 56.0, '%')
('temp =', 21.0, 'C\thumidity =', 56.0, '%')

5.Example Project: Sensor Twitter Feed（センサ値のツイート）

https://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/
http://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/raspberry-pi-twitter-sensor-feed/
https://github.com/DexterInd/GrovePi/tree/master/Projects/Sensor_Twitter_Feed

ツイートには対応していません。

センサ

コード

wifi_twit.py

#import twitter
import time
import grovepi
import math

# Connections
sound_sensor = 0        # port A0
light_sensor = 1        # port A1
temperature_sensor = 2  # port D2
led = 3                 # port D3

intro_str = "DI Lab's"

# Connect to Twitter
"""
api = twitter.Api(
    consumer_key='YourKey',
    consumer_secret='YourKey',
    access_token_key='YourKey',
    access_token_secret='YourKey'
    )
"""

grovepi.pinMode(led,"OUTPUT")
grovepi.analogWrite(led,255)  #turn led to max to show readiness

while True:

    # Error handling in case of problems communicating with the GrovePi
    try:

        # Get value from light sensor
        light_intensity = grovepi.analogRead(light_sensor)

        # Give PWM output to LED
        #grovepi.analogWrite(led,light_intensity/4)
        grovepi.analogWrite(led,light_intensity*20)

        # Get sound level
        sound_level = grovepi.analogRead(sound_sensor)

        time.sleep(0.5)

        # Get value from temperature sensor
        [t,h]=[0,0]
        [t,h] = grovepi.dht(temperature_sensor,0)

        # Post a tweet
        out_str ="%s Temp: %d C, Humidity: %d, Light: %d, Sound: %d" %(intro_str,t,h,light_intensity/10,sound_level)
        print (out_str)
        #api.PostUpdate(out_str)

        #time.sleep(60)
        time.sleep(2)

    except IOError:
        print("Error")
        exit()

    except KeyboardInterrupt:
        exit()

    except Exception as e:
        print("Duplicate Tweet or Twitter Refusal: {}".format(e))
        exit()

結果

$ python wifi_twit.py
DI Lab's Temp: 24 C, Humidity: 50, Light: 76, Sound: 593
DI Lab's Temp: 24 C, Humidity: 51, Light: 76, Sound: 196
DI Lab's Temp: 24 C, Humidity: 51, Light: 76, Sound: 195
DI Lab's Temp: 24 C, Humidity: 51, Light: 76, Sound: 197

6.Grove - Buzzer（ブザー）

https://www.seeedstudio.com/Grove-Buzzer.html
http://wiki.seeedstudio.com/Grove-Buzzer/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_buzzer.py

import time
import grovepi

# Connect the Grove Buzzer to digital port D8
# SIG,NC,VCC,GND
buzzer = 8

grovepi.pinMode(buzzer,"OUTPUT")

# Buzz for 1 second
grovepi.digitalWrite(buzzer,1)
print ('start')
time.sleep(1)

# Stop buzzing for 1 second and repeat
grovepi.digitalWrite(buzzer,0)
print ('stop')

結果

$ python grove_buzzer.py
start
stop

7.Grove - Button（ボタン）

https://www.seeedstudio.com/Grove-Button.html
http://wiki.seeedstudio.com/Grove-Button/#play-with-raspberry-piwith-grovepi_plus

センサ

コード

grove_button.py

import time
import grovepi

# Connect the Grove Button to digital port D4
# SIG,NC,VCC,GND
button = 4

grovepi.pinMode(button,"INPUT")

while True:
    try:
        print(grovepi.digitalRead(button))
        time.sleep(0.5)

    except KeyboardInterrupt:   # Stop the buzzer before stopping
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_button.py
0
0
0
1
1
1
0
0
1
0
0
0

8.Grove - LED

https://www.seeedstudio.com/Grove-Green-LED.html
https://www.seeedstudio.com/Grove-Red-LED.html
https://www.seeedstudio.com/Grove-Blue-LED.html
http://wiki.seeedstudio.com/Grove-Red_LED/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_led_blink.py

import time
from grovepi import *

# Connect the Grove LED to digital port D4
led = 4

pinMode(led,"OUTPUT")
time.sleep(1)

while True:
    try:
        #Blink the LED
        digitalWrite(led,1) # Send HIGH to switch on LED
        print ("LED ON!")
        time.sleep(1)

        digitalWrite(led,0) # Send LOW to switch off LED
        print ("LED OFF!")
        time.sleep(1)

    except KeyboardInterrupt:   # Turn LED off before stopping
        digitalWrite(led,0)
        break

    except IOError:     # Print "Error" if communication error encountered
        print ("Error")

結果

$ python grove_led_blink.py
LED ON!
LED OFF!
LED ON!
LED OFF!
LED ON!

9.Grove - Sound Sensor（音センサ）

https://www.seeedstudio.com/Grove-Sound-Sensor.html
http://wiki.seeedstudio.com/Grove-Sound_Sensor/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_sound_sensor.py

import time
import grovepi

# Connect the Grove Sound Sensor to analog port A0
# SIG,NC,VCC,GND
sound_sensor = 0

# Connect the Grove LED to digital port D5
# SIG,NC,VCC,GND
led = 5

grovepi.pinMode(sound_sensor,"INPUT")
grovepi.pinMode(led,"OUTPUT")

# The threshold to turn the led on 400.00 * 5 / 1024 = 1.95v
#threshold_value = 400
threshold_value = 40

while True:
    try:
        # Read the sound level
        sensor_value = grovepi.analogRead(sound_sensor)

        # If loud, illuminate LED, otherwise dim
        if sensor_value > threshold_value:
            grovepi.digitalWrite(led,1)
        else:
            grovepi.digitalWrite(led,0)

        print("sensor_value = %d" %sensor_value)
        time.sleep(0.5)

    except KeyboardInterrupt:
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_sound_sensor.py
sensor_value = 580
sensor_value = 221
sensor_value = 270
sensor_value = 976
sensor_value = 755
sensor_value = 222
sensor_value = 222
sensor_value = 222
sensor_value = 222
sensor_value = 221
sensor_value = 222

10.Grove - Relay（リレー）

https://www.seeedstudio.com/Grove-Relay.html
http://wiki.seeedstudio.com/Grove-Relay/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_switch_relay.py

import time
import grovepi
# Connect the Grove Switch to digital port D3
# SIG,NC,VCC,GND

switch = 3
# Connect the Grove Relay to digital port D4
# SIG,NC,VCC,GND

relay = 4
grovepi.pinMode(switch,"INPUT")
grovepi.pinMode(relay,"OUTPUT")
grovepi.digitalWrite(relay,0)

while True:
    try:
        if grovepi.digitalRead(switch):
            print("ON")
            grovepi.digitalWrite(relay,1)
        else:
            grovepi.digitalWrite(relay,0)
            print("OFF")
        time.sleep(0.5)

    except KeyboardInterrupt:
        grovepi.digitalWrite(relay,0)
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_switch_relay.py
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF

11.Grove - Ultrasonic Distance Sensor（距離センサ）

https://www.seeedstudio.com/Grove-Ultrasonic-Distance-Sensor.html
http://wiki.seeedstudio.com/Grove-Ultrasonic_Ranger/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_ultrasonic.py

from grovepi import *

# Connect the Grove Ultrasonic Ranger to digital port D4
# SIG,NC,VCC,GND

ultrasonic_ranger = 4

while True:
    try:
        # Read distance value from Ultrasonic
        print ultrasonicRead(ultrasonic_ranger)
        time.sleep(0.2)

    except KeyboardInterrupt:
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_ultrasonic.py
166
166
166
36
32
31
31
31
30
30
38
166
166
4
2
2
166
166

12.Grove - Temperature & Humidity Sensor (DHT11)（温湿度センサ）

https://www.seeedstudio.com/Grove-Temperature-Humidity-Sensor-DHT11.html
http://wiki.seeedstudio.com/Grove-TemperatureAndHumidity_Sensor/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_dht_pro.py

import grovepi
import math
import time
# Connect the Grove Temperature & Humidity Sensor Pro to digital port D4
# This example uses the blue colored sensor.
# SIG,NC,VCC,GND
sensor = 4  # The Sensor goes on digital port 4.

# temp_humidity_sensor_type
# Grove Base Kit comes with the blue sensor.
blue = 0    # The Blue colored sensor.
white = 1   # The White colored sensor.

while True:
    try:
        # This example uses the blue colored sensor.
        # The first parameter is the port, the second parameter is the type of sensor.
        [temp,humidity] = grovepi.dht(sensor,blue)  
        if math.isnan(temp) == False and math.isnan(humidity) == False:
            print("temp = %.02f C humidity =%.02f%%"%(temp, humidity))
        time.sleep(0.5)

    except KeyboardInterrupt:
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_dht_pro.py
temp = 19.00 C humidity =63.00%
temp = 19.00 C humidity =63.00%
temp = 19.00 C humidity =63.00%
temp = 19.00 C humidity =62.00%

13.Grove - Rotary Angle Sensor（回転角度センサ）

https://www.seeedstudio.com/Grove-Rotary-Angle-Sensor.html
http://wiki.seeedstudio.com/Grove-Rotary_Angle_Sensor/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_rotary_angle_sensor.py

import time
import grovepi

# Connect the Grove Rotary Angle Sensor to analog port A0
# SIG,NC,VCC,GND
potentiometer = 0

# Connect the LED to digital port D5
# SIG,NC,VCC,GND
led = 5

grovepi.pinMode(potentiometer,"INPUT")
grovepi.pinMode(led,"OUTPUT")
time.sleep(1)

# Reference voltage of ADC is 5v
adc_ref = 5

# Vcc of the grove interface is normally 5v
grove_vcc = 5

# Full value of the rotary angle is 300 degrees, as per it's specs (0 to 300)
full_angle = 300

while True:
    try:
        # Read sensor value from potentiometer
        sensor_value = grovepi.analogRead(potentiometer)

        # Calculate voltage
        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)

        # Calculate rotation in degrees (0 to 300)
        degrees = round((voltage * full_angle) / grove_vcc, 2)

        # Calculate LED brightess (0 to 255) from degrees (0 to 300)
        brightness = int(degrees / full_angle * 255)

        # Give PWM output to LED
        grovepi.analogWrite(led,brightness)

        print("sensor_value = %d voltage = %.2f degrees = %.1f brightness = %d" %(sensor_value, voltage, degrees, brightness))
        time.sleep(0.2)

    except KeyboardInterrupt:
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_rotary_angle_sensor.py
sensor_value = 0 voltage = 0.00 degrees = 0.0 brightness = 0
sensor_value = 0 voltage = 0.00 degrees = 0.0 brightness = 0
sensor_value = 0 voltage = 0.00 degrees = 0.0 brightness = 0
sensor_value = 222 voltage = 1.09 degrees = 65.4 brightness = 55
sensor_value = 392 voltage = 1.92 degrees = 115.2 brightness = 97
sensor_value = 485 voltage = 2.37 degrees = 142.2 brightness = 120
sensor_value = 511 voltage = 2.50 degrees = 150.0 brightness = 127
sensor_value = 530 voltage = 2.59 degrees = 155.4 brightness = 132
sensor_value = 562 voltage = 2.75 degrees = 165.0 brightness = 140
sensor_value = 617 voltage = 3.02 degrees = 181.2 brightness = 154
sensor_value = 706 voltage = 3.45 degrees = 207.0 brightness = 175
sensor_value = 826 voltage = 4.04 degrees = 242.4 brightness = 206
sensor_value = 950 voltage = 4.64 degrees = 278.4 brightness = 236
sensor_value = 1021 voltage = 4.99 degrees = 299.4 brightness = 254
sensor_value = 1023 voltage = 5.00 degrees = 300.0 brightness = 255
sensor_value = 1023 voltage = 5.00 degrees = 300.0 brightness = 255
sensor_value = 1023 voltage = 5.00 degrees = 300.0 brightness = 255
sensor_value = 1022 voltage = 5.00 degrees = 300.0 brightness = 255

14.Grove - Light Sensor v1.2（光センサ）

https://www.seeedstudio.com/Grove-Light-Sensor-v1-2.html
http://wiki.seeedstudio.com/Grove-Light_Sensor/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_light_sensor.py

import time
import grovepi

# Connect the Grove Light Sensor to analog port A0
# SIG,NC,VCC,GND
light_sensor = 0

# Connect the LED to digital port D4
# SIG,NC,VCC,GND
led = 4

# Turn on LED once sensor exceeds threshold resistance
threshold = 10

grovepi.pinMode(light_sensor,"INPUT")
grovepi.pinMode(led,"OUTPUT")

while True:
    try:
        # Get sensor value
        sensor_value = grovepi.analogRead(light_sensor)

        # Calculate resistance of sensor in K
        resistance = (float)(1023 - sensor_value) * 10 / sensor_value

        if resistance > threshold:
            # Send HIGH to switch on LED
            grovepi.digitalWrite(led,1)
        else:
            # Send LOW to switch off LED
            grovepi.digitalWrite(led,0)

        print("sensor_value = %d resistance = %.2f" %(sensor_value,  resistance))
        time.sleep(0.5)

    except KeyboardInterrupt:   # Turn LED off before stopping
        grovepi.digitalWrite(led,0)
        break
    except IOError:             # Print "Error" if communication error encountered
        print ("Error")

結果

$ python grove_light_sensor.py
sensor_value = 64 resistance = 149.84
sensor_value = 68 resistance = 140.44
sensor_value = 72 resistance = 132.08
sensor_value = 75 resistance = 126.40
sensor_value = 76 resistance = 124.61
sensor_value = 91 resistance = 102.42
sensor_value = 404 resistance = 15.32
sensor_value = 511 resistance = 10.02
sensor_value = 512 resistance = 9.98
sensor_value = 496 resistance = 10.62
sensor_value = 771 resistance = 3.27
sensor_value = 771 resistance = 3.27
sensor_value = 772 resistance = 3.25
sensor_value = 772 resistance = 3.25

15.Grove - LCD RGB Backlight

https://www.seeedstudio.com/Grove-LCD-RGB-Backlight.html
http://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/#play-with-raspberry-pi

センサ

コード

grove_rgb_lcd2.py

import time
import sys

if sys.platform == 'uwp':
    import winrt_smbus as smbus
    bus = smbus.SMBus(1)
else:
    import smbus
    import RPi.GPIO as GPIO
    rev = GPIO.RPI_REVISION
    if rev == 2 or rev == 3:
        bus = smbus.SMBus(1)
    else:
        bus = smbus.SMBus(0)

# this device has two I2C addresses
DISPLAY_RGB_ADDR = 0x62
DISPLAY_TEXT_ADDR = 0x3e

# set backlight to (R,G,B) (values from 0..255 for each)
def setRGB(r,g,b):
    bus.write_byte_data(DISPLAY_RGB_ADDR,0,0)
    bus.write_byte_data(DISPLAY_RGB_ADDR,1,0)
    bus.write_byte_data(DISPLAY_RGB_ADDR,0x08,0xaa)
    bus.write_byte_data(DISPLAY_RGB_ADDR,4,r)
    bus.write_byte_data(DISPLAY_RGB_ADDR,3,g)
    bus.write_byte_data(DISPLAY_RGB_ADDR,2,b)

# send command to display (no need for external use)    
def textCommand(cmd):
    bus.write_byte_data(DISPLAY_TEXT_ADDR,0x80,cmd)

# set display text \n for second line(or auto wrap)     
def setText(text):
    textCommand(0x01) # clear display
    time.sleep(.05)
    textCommand(0x08 | 0x04) # display on, no cursor
    textCommand(0x28) # 2 lines
    time.sleep(.05)
    count = 0
    row = 0
    for c in text:
        if c == '\n' or count == 16:
            count = 0
            row += 1
            if row == 2:
                break
            textCommand(0xc0)
            if c == '\n':
                continue
        count += 1
        bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))

#Update the display without erasing the display
def setText_norefresh(text):
    textCommand(0x02) # return home
    time.sleep(.05)
    textCommand(0x08 | 0x04) # display on, no cursor
    textCommand(0x28) # 2 lines
    time.sleep(.05)
    count = 0
    row = 0
    while len(text) < 32: #clears the rest of the screen
        text += ' '
    for c in text:
        if c == '\n' or count == 16:
            count = 0
            row += 1
            if row == 2:
                break
            textCommand(0xc0)
            if c == '\n':
                continue
        count += 1
        bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))

# example code
if __name__=="__main__":
    setText("Hello world\nThis is an LCD test")
    setRGB(0,128,64)
    time.sleep(2)
    for c in range(0,255):
        setText_norefresh("Going to sleep in {}...".format(str(c)))
        setRGB(c,255-c,0)
        time.sleep(0.1)
    setRGB(0,255,0)
    setText("Bye bye, this should wrap onto next line")

結果

他のセンサを試してみた

16.Grove - Touch Sensor（タッチセンサ）

https://www.seeedstudio.com/Grove-Touch-Sensor.html
http://wiki.seeedstudio.com/Grove-Touch_Sensor/#play-with-raspberry-pi-with-grovepi_plus

センサ

コード

grove_button.py

import time
import grovepi

# Connect the Grove Button to digital port D4
# SIG,NC,VCC,GND
button = 4

grovepi.pinMode(button,"INPUT")

while True:
    try:
        print(grovepi.digitalRead(button))
        time.sleep(0.5)

    except KeyboardInterrupt:   # Stop the buzzer before stopping
        break

    except (IOError,TypeError) as e:
        print("Error")
        break

結果

$ python grove_button.py
0
0
0
1
1
1
0
0
1
1
0
0
0

17.Grove - Magnetic Switch（磁気スイッチ）

https://www.seeedstudio.com/Grove-Magnetic-Switch-p-744.html
http://wiki.seeedstudio.com/Grove-Magnetic_Switch/#play-with-raspberry-pi

センサ

コード

grovepi_tilt_switch.py

import time
import grovepi

# Connect the Grove Tilt Switch to digital port D2
# SIG,NC,VCC,GND
tilt_switch = 2

grovepi.pinMode(tilt_switch,"INPUT")

while True:
    try:
        print grovepi.digitalRead(tilt_switch)
        time.sleep(0.5)
    except KeyboardInterrupt:
        break
    except IOError:
        print ("Error")

結果

$ python grovepi_tilt_switch.py
0
0
0
1
0
0
1
1
1
1
1
0
0
0
0

18.Grove - Tilt Switch（傾きセンサ）

https://www.seeedstudio.com/Grove-Tilt-Switch.html
http://wiki.seeedstudio.com/Grove-Tilt_Switch/

センサ

コードと結果
「17.Grove - Magnetic Switch（磁気スイッチ）」と同じ。

19.Grove - 3 Axis Digital Accelerometer(±16g)（加速度計）

センサ

Grove Pi+ 経由のサンプルが無く、以下の赤囲みのI2Cと5V電源を直接使う。

コード

grovepi_accelerometer.py

import smbus
from time import sleep

# select the correct i2c bus for this revision of Raspberry Pi
revision = ([l[12:-1] for l in open('/proc/cpuinfo','r').readlines() if l[:8]=="Revision"]+['0000'])[0]
bus = smbus.SMBus(1 if int(revision, 16) >= 4 else 0)

# ADXL345 constants
EARTH_GRAVITY_MS2   = 9.80665
SCALE_MULTIPLIER    = 0.004

DATA_FORMAT         = 0x31
BW_RATE             = 0x2C
POWER_CTL           = 0x2D

BW_RATE_1600HZ      = 0x0F
BW_RATE_800HZ       = 0x0E
BW_RATE_400HZ       = 0x0D
BW_RATE_200HZ       = 0x0C
BW_RATE_100HZ       = 0x0B
BW_RATE_50HZ        = 0x0A
BW_RATE_25HZ        = 0x09

RANGE_2G            = 0x00
RANGE_4G            = 0x01
RANGE_8G            = 0x02
RANGE_16G           = 0x03

MEASURE             = 0x08
AXES_DATA           = 0x32

class ADXL345:

    address = None

    def __init__(self, address = 0x53):
        self.address = address
        self.setBandwidthRate(BW_RATE_100HZ)
        self.setRange(RANGE_2G)
        self.enableMeasurement()

    def enableMeasurement(self):
        bus.write_byte_data(self.address, POWER_CTL, MEASURE)

    def setBandwidthRate(self, rate_flag):
        bus.write_byte_data(self.address, BW_RATE, rate_flag)

    # set the measurement range for 10-bit readings
    def setRange(self, range_flag):
        value = bus.read_byte_data(self.address, DATA_FORMAT)

        value &= ~0x0F;
        value |= range_flag;
        value |= 0x08;

        bus.write_byte_data(self.address, DATA_FORMAT, value)

    # returns the current reading from the sensor for each axis
    #
    # parameter gforce:
    #    False (default): result is returned in m/s^2
    #    True           : result is returned in gs
    def getAxes(self, gforce = False):
        bytes = bus.read_i2c_block_data(self.address, AXES_DATA, 6)

        x = bytes[0] | (bytes[1] << 8)
        if(x & (1 << 16 - 1)):
            x = x - (1<<16)

        y = bytes[2] | (bytes[3] << 8)
        if(y & (1 << 16 - 1)):
            y = y - (1<<16)

        z = bytes[4] | (bytes[5] << 8)
        if(z & (1 << 16 - 1)):
            z = z - (1<<16)

        x = x * SCALE_MULTIPLIER
        y = y * SCALE_MULTIPLIER
        z = z * SCALE_MULTIPLIER

        if gforce == False:
            x = x * EARTH_GRAVITY_MS2
            y = y * EARTH_GRAVITY_MS2
            z = z * EARTH_GRAVITY_MS2

        x = round(x, 4)
        y = round(y, 4)
        z = round(z, 4)

        return {"x": x, "y": y, "z": z}

if __name__ == "__main__":
    # if run directly we'll just create an instance of the class and output
    # the current readings
    adxl345 = ADXL345()

    while True:
        try:
            axes = adxl345.getAxes(True)
            print("ADXL345 on address 0x%x:" % (adxl345.address))
            print("   x = %.3fG" % ( axes['x'] ))
            print("   y = %.3fG" % ( axes['y'] ))
            print("   z = %.3fG" % ( axes['z'] ))
            sleep(2)

        except KeyboardInterrupt:
            break

        except (IOError,TypeError) as e:
            print("Error")
            break

結果

$ python grovepi_accelerometer.py
ADXL345 on address 0x53:
   x = -0.072G
   y = -0.136G
   z = 0.908G
ADXL345 on address 0x53:
   x = 0.252G
   y = 0.752G
   z = 0.024G
ADXL345 on address 0x53:
   x = -0.204G
   y = -0.200G
   z = -1.012G
ADXL345 on address 0x53:
   x = 0.088G
   y = -0.356G
   z = 0.828G

その他

今回試験していませんが、保有している以下のセンサも今後試してみるつもりです。

You get articles that match your needs
You can efficiently read back useful information
You can use dark theme

What you can do with signing up

Grove Pi+スターターキットのセンサを試す

概要

Grove Pi+ の設定と試験環境

使用OS

使用ライブラリィ

（重要）ライブラリィ不具合の修正

試験環境

Grove Pi+ スターターキット付属のセンサを試す

1.Example Project: LED Fade（LEDのフェード）

2.Example Project: Button And Buzzer（ボタンブザー）

3.Example Project: Ultrasonic And Relay（距離センサとリレー）

4.Example Project: Home Weather Display（家の気温と湿度を表示）

5.Example Project: Sensor Twitter Feed（センサ値のツイート）

6.Grove - Buzzer（ブザー）

7.Grove - Button（ボタン）

8.Grove - LED

9.Grove - Sound Sensor（音センサ）

10.Grove - Relay（リレー）

11.Grove - Ultrasonic Distance Sensor（距離センサ）

12.Grove - Temperature & Humidity Sensor (DHT11)（温湿度センサ）

13.Grove - Rotary Angle Sensor（回転角度センサ）

14.Grove - Light Sensor v1.2（光センサ）

15.Grove - LCD RGB Backlight

他のセンサを試してみた

16.Grove - Touch Sensor（タッチセンサ）

17.Grove - Magnetic Switch（磁気スイッチ）

18.Grove - Tilt Switch（傾きセンサ）

19.Grove - 3 Axis Digital Accelerometer(±16g)（加速度計）

その他

絶対圧センサ評価モジュール

Grove - Temperature Sensor（温度センサ）

Grove - GPS Module

Grove - Water Sensor（水センサ）

Grove - Moisture Sensor（水分センサ）