Error using Moisture Sensor v1.4

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taha965
Pre-kindergarten
Pre-kindergarten
Posts: 7
Joined: Mon Jun 11, 2018 6:50 pm

Error using Moisture Sensor v1.4

Post by taha965 » Thu Jul 26, 2018 7:47 pm

I am using a Raspberry Pi 3 with a GrovePi+. The code I am using is given below:

Code: Select all

#!/usr/bin/env python
#
# GrovePi Example for using the Grove Moisture Sensor (http://www.seeedstudio.com/wiki/Grove_-_Moisture_sensor)
#
# The GrovePi connects the Raspberry Pi and Grove sensors.  You can learn more about GrovePi here:  http://www.dexterindustries.com/GrovePi
#
# Have a question about this example?  Ask on the forums here:  http://forum.dexterindustries.com/c/grovepi
#

'''
## License
The MIT License (MIT)
GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
Copyright (C) 2017  Dexter Industries
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
'''

# NOTE:
# 	The wiki suggests the following sensor values:
# 		Min  Typ  Max  Condition
# 		0    0    0    sensor in open air
# 		0    20   300  sensor in dry soil
# 		300  580  700  sensor in humid soil
# 		700  940  950  sensor in water
	
# 	Sensor values observer: 
# 		Val  Condition
# 		0    sensor in open air
# 		18   sensor in dry soil
# 		425  sensor in humid soil
# 		690  sensor in water

import time
import grovepi

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

while True:
    try:
        print(grovepi.analogRead(sensor))
        time.sleep(.5)

    except KeyboardInterrupt:
        break
    except IOError:
        print ("Error")
The error message is given below:

Code: Select all

Traceback (most recent call last):
  File "/home/pi/Dexter/GrovePi/Software/Python/grove_moisture_sensor.py", line 61, in <module>
    print(grovepi.analogRead(sensor))
  File "/home/pi/Dexter/GrovePi/Software/Python/grovepi.py", line 227, in analogRead
    return number[1] * 256 + number[2]
TypeError: 'int' object is not subscriptable

bill.yu
Elementary-2
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Posts: 235
Joined: Mon Apr 02, 2018 11:05 am

Re: Error using Moisture Sensor v1.4

Post by bill.yu » Tue Jul 31, 2018 11:57 am

Hi,

I used the latest raspberry image(2018.6.27). then i run below command to install grovepi.

sudo curl -kL dexterindustries.com/update_grovepi | bash
sudo reboot

at last, i run below commands and it is the output. thanks.
pi@raspberrypi:~/GrovePi/Software/Python $ python grove_moisture_sensor.py

0
1
0
2
0
1
0
0
0
0
38
3
68
82
91
107
119
101
0

Bill

taha965
Pre-kindergarten
Pre-kindergarten
Posts: 7
Joined: Mon Jun 11, 2018 6:50 pm

Re: Error using Moisture Sensor v1.4

Post by taha965 » Tue Jul 31, 2018 6:47 pm

I tried everything you suggested and I now get a different error:

Code: Select all

Traceback (most recent call last):
  File "grove_moisture_sensor.py", line 61, in <module>
    print(grovepi.analogRead(sensor))
  File "/home/pi/Dexter/GrovePi/Software/Python/grovepi.py", line 227, in analogRead
    return number[1] * 256 + number[2]
TypeError: 'int' object has no attribute '__getitem__'

bill.yu
Elementary-2
Elementary-2
Posts: 235
Joined: Mon Apr 02, 2018 11:05 am

Re: Error using Moisture Sensor v1.4

Post by bill.yu » Wed Aug 01, 2018 9:42 am

Hi, please try update the firmware and see if the issue is solved. thanks.

https://www.dexterindustries.com/GroveP ... -firmware/

Bill

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