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Support for Capacitive Soil Moisture Sensor #114

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barista123 opened this issue Jun 26, 2020 · 34 comments · Fixed by #115
Closed

Support for Capacitive Soil Moisture Sensor #114

barista123 opened this issue Jun 26, 2020 · 34 comments · Fixed by #115

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@barista123
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I would like to add Capacitive Soil Moisture Sensors to my setup such as these: Capacitive Soil Moisture Sensor to my setup. I know that they need a ADC. Is it possible with the current state of this project? If so, please recommend hardware. I am new to working with the GPIOs and I am not a programmer.

Thanks for the project
@BenjiU
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BenjiU commented Jun 27, 2020 via email

@barista123
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I do not currently have the MCP3008, but I am able to buy them. I will be ordering the moisture sensors next week. If you can implement the lib or tell me what I need to do, I will order MCP3008 at the same time and test it.

@BenjiU
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BenjiU commented Jun 27, 2020 via email

@barista123
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Thanks. It will probably be next weekend before I get the parts. I will also need some basic instructions on how to pull the branch for testing. I installed the master via pip3.

@BenjiU BenjiU linked a pull request Jun 29, 2020 that will close this issue
Feature/mcp3008 #115
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@barista123
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@BenjiU I see that you created a pull request. I should be receiving the MCP3008 today or tomorrow and will be ready to test. Please let me know how to install the branch and I will give it a try.

@BenjiU
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BenjiU commented Jul 1, 2020 •
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Hi, I already wrote something, but closed the browser, bevor saving :-D
0. Enalbe spi on raspberry pi https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md

  1. (optional) create virtual env virtualenv ve enter it cd ve and activate it . bin/activate
  2. clone the project git clone https://github.com/flyte/pi-mqtt-gpio.git
  3. checkout the feature branch git checkout feature/mcp3008
  4. create your config file e.g. config.mcp3008.yml
mqtt:
  host: localhost
  port: 1883
  user: "xxx"
  password: "xxx"
  topic_prefix: mcptest

sensor_modules:
  - name: mcp3008_sensor
    module: mcp3008

sensor_inputs:
  - name: mcp3008_value
    module: mcp3008_sensor
    interval: 15
    digits: 2
  1. start the application python pi_mqtt_gpio/server.py config.mcp3008.yml
  2. send me the erros, that will occur :-D

@barista123
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Had to rebuild my pi. Just getting a chance to test. Got this error on startup

2020-07-03 14:22:24,341 mqtt_gpio (INFO): Startup
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting RPi.GPIO
Downloading https://www.piwheels.org/simple/rpi-gpio/RPi.GPIO-0.7.0-cp37-cp37m-linux_armv7l.whl (69 kB)
|████████████████████████████████| 69 kB 225 kB/s
Installing collected packages: RPi.GPIO
Successfully installed RPi.GPIO-0.7.0
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting spidev
Downloading https://www.piwheels.org/simple/spidev/spidev-3.5-cp37-cp37m-linux_armv7l.whl (40 kB)
|████████████████████████████████| 40 kB 239 kB/s
Installing collected packages: spidev
Successfully installed spidev-3.5
Traceback (most recent call last):
File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 1216, in
main(args)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 1043, in main
SENSOR_MODULES[sensor_config["name"]] = configure_sensor_module(sensor_config)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 586, in configure_sensor_module
return sensor_module.Sensor(sensor_config)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/modules/mcp3008.py", line 27, in init
self.spi.open(0,0)
FileNotFoundError: [Errno 2] No such file or directory

@BenjiU
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BenjiU commented Jul 4, 2020 •
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Hi barista123,

I got the same error, but I did not do the Step 0, because I don't have any spi hardware for testing. Can you see device /dev/spi0.0? ls /dev/spi0.0?
This Post hackerspacesv/I32CTT#1 says, we have spi0.1? may you confirm that?

@barista123
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ls /dev/spi0.0 and /dev/spi0.1 report "no such file or directory"

It appears that the device is "/dev/spidev0.0" and "/dev/spidev0.1"

I discovered this by running "ls /dev/spi*"

Let me know what I can do next.

@barista123
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Round two: I get this now (discovered that my spi were not enabled on first try)

2020-07-05 06:43:50,139 mqtt_gpio (INFO): Startup
Traceback (most recent call last):
File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/srv/ve/lib/python3.7/site-packages/pi_mqtt_gpio/server.py", line 887, in
main(args)
File "/srv/ve/lib/python3.7/site-packages/pi_mqtt_gpio/server.py", line 773, in main
SENSOR_MODULES[sensor_config["name"]] = configure_sensor_module(sensor_config)
File "/srv/ve/lib/python3.7/site-packages/pi_mqtt_gpio/server.py", line 448, in configure_sensor_module
sensor_module = import_module("pi_mqtt_gpio.modules.%s" % sensor_config["module"])
File "/usr/lib/python3.7/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'pi_mqtt_gpio.modules.mcp3008'

@BenjiU
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BenjiU commented Jul 5, 2020

But you are on the the "feature/mcp3008" branchgit status? Does the file mcp3008.py exists?

@barista123
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On branch feature/mcp3008
Your branch is up to date with 'origin/feature/mcp3008'.

nothing to commit, working tree clean

Where would I find the mcp3008.py file? I'm not seeing it in the directory

@barista123
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Looks like it was an error in the way I was calling the program. It now started up, without error. Let me plug my sensor back in and see if I get any readings

@barista123
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It appears to have gotten past the error, but I am not seeing any output from the sensor. Is it because we have not told the system which of the 8 channels to monitor?

I am setting up another program real quick to see if I get any output to confirm that my hardware is working

@BenjiU
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BenjiU commented Jul 5, 2020

By default it should read CH0. Otherwise you may configure it with the channel parameter:

  - name: mcp3008_voltage
    module: mcp3008_sensor
    interval: 300  # measurement every 5min
    channel: CH4 # measure on CH4 of MCP3008

@barista123
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using these instructions, I have confirmed that the sensor works: https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008

I will try assigning the channel and see if that helps.

@barista123
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Now getting this error:

/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py:728: DeprecationWarning: fractions.gcd() is deprecated. Use math.gcd() instead.
cycle_time = reduce(lambda x, y: gcd(x, y), arr)
Exception in thread pi-mqtt-gpio_SensorReader:
Traceback (most recent call last):
File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/usr/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 747, in sensor_timer_thread
value = sensor.get_value(sens_conf)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/modules/mcp3008.py", line 50, in get_value
channel = self.channels.get(config.channel, "invalid")
AttributeError: 'dict' object has no attribute 'channel'

@BenjiU
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BenjiU commented Jul 5, 2020

Hi, I fixed something: please do a git pull and try it again :-)

@barista123
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Getting closer. . .
That got it past the error, but now I get a sensor value of 0 regardless of the input

@BenjiU
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BenjiU commented Jul 5, 2020

I added some traces for debugging git pull. Please attach the "MCP3008: xxx" traces.

@barista123
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2020-07-05 08:35:44,788 mqtt_gpio (INFO): Startup
Traceback (most recent call last):
File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 1216, in
main(args)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 1043, in main
SENSOR_MODULES[sensor_config["name"]] = configure_sensor_module(sensor_config)
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/server.py", line 576, in configure_sensor_module
sensor_module = import_module("pi_mqtt_gpio.modules.%s" % sensor_config["module"])
File "/usr/lib/python3.7/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 677, in _load_unlocked
File "", line 724, in exec_module
File "", line 860, in get_code
File "", line 791, in source_to_code
File "", line 219, in _call_with_frames_removed
File "/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/modules/mcp3008.py", line 47
_LOG.warning("MCP3008: adc %s", bytes(adc).hex())
^
IndentationError: unexpected indent

@BenjiU
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BenjiU commented Jul 5, 2020

sorry, my fault. :-( Please pull again!

@barista123
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Got this:

2020-07-05 08:41:46,269 mqtt_gpio (INFO): Startup
2020-07-05 08:41:47,505 mqtt_gpio (WARNING): MCP3008: Reading from channel 0
2020-07-05 08:41:47,507 mqtt_gpio (WARNING): MCP3008: adc 000000
2020-07-05 08:41:47,508 mqtt_gpio (WARNING): MCP3008: data 0
2020-07-05 08:41:47,509 mqtt_gpio (WARNING): MCP3008: value 0
2020-07-05 08:41:47,510 mqtt_gpio (INFO): sensor_timer_thread: reading sensor 'mcp3008_value' value 0

When I ended the program with "ctrl+ c" I got this:

/srv/ve/pi-mqtt-gpio/pi_mqtt_gpio/modules/raspberrypi.py:73: RuntimeWarning: No channels have been set up yet - nothing to clean up! Try cleaning up at the end of your program instead!
self.io.cleanup()

In contrast, the AdaFruit example that I linked above returns this:

root@DietPi:/srv/ve1# sudo python3 simpletest.py

Reading MCP3008 values, press Ctrl-C to quit...
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |

| 870 | 3 | 4 | 4 | 5 | 4 | 5 | 7 |
| 870 | 6 | 5 | 4 | 3 | 1 | 0 | 0 |
| 870 | 3 | 4 | 5 | 6 | 5 | 5 | 6 |
| 870 | 3 | 0 | 2 | 1 | 1 | 2 | 3 |
| 870 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| 870 | 3 | 2 | 2 | 2 | 1 | 2 | 3 |
| 870 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| 870 | 2 | 3 | 2 | 3 | 4 | 5 | 7 |
| 870 | 6 | 5 | 4 | 2 | 1 | 1 | 1 |
| 870 | 5 | 6 | 6 | 5 | 4 | 2 | 1 |
| 870 | 2 | 3 | 5 | 5 | 5 | 6 | 7 |
| 870 | 4 | 3 | 2 | 2 | 2 | 3 | 5 |
| 870 | 6 | 6 | 5 | 4 | 2 | 0 | 0 |
^CTraceback (most recent call last):
File "simpletest.py", line 39, in
time.sleep(0.5)

@barista123
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I should clarify, the second readings are from a dry sensor. A wet sensor provides the following readings:

root@DietPi:/srv/ve1# sudo python3 simpletest.py
Reading MCP3008 values, press Ctrl-C to quit...
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |

| 445 | 2 | 2 | 2 | 3 | 4 | 4 | 6 |
| 445 | 7 | 7 | 6 | 6 | 5 | 4 | 4 |
| 445 | 2 | 2 | 3 | 4 | 5 | 6 | 9 |
| 445 | 5 | 4 | 2 | 1 | 1 | 2 | 5 |
| 445 | 7 | 7 | 6 | 5 | 3 | 1 | 0 |
| 445 | 3 | 4 | 5 | 5 | 5 | 6 | 9 |
| 445 | 6 | 5 | 5 | 4 | 1 | 0 | 0 |
| 445 | 4 | 5 | 5 | 5 | 5 | 6 | 8 |
^CTraceback (most recent call last):
File "simpletest.py", line 39, in
time.sleep(0.5)

@BenjiU
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BenjiU commented Jul 5, 2020

Okay, I'll try to implement the Adafruit lib :-) but I can't start before this evening.

@barista123
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Thanks. I appreciate the help.

@BenjiU
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BenjiU commented Jul 5, 2020

Hi, I implemented the Adafruit lib. Please pull and run python3 with sudo. When i use python2, it can't load the adafruit lib.
sudo python3 -m pi_mqtt_gpio.server config.mcp3008.yml

@barista123
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barista123 commented Jul 5, 2020 via email

@BenjiU
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BenjiU commented Jul 6, 2020 •
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Hi, sounds good. I had a look at my python environment and noticed, that pip installs to python3.6, but python runs python2.7 :-) when I manually do pip2 install Adafruit-xxx, I can run it with python (not python3). So maybe it works for you with python xxx.

@barista123
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barista123 commented Jul 6, 2020 via email

@barista123
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I apologize. I did not get a chance to do further testing last night. I will try tonight and post my results.

@barista123
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On a different topic, I can open a different issue if appropriate. My temperature sensor, DHT22, does not like the environment that I am using it in (greenhouse). If I cannot find a suitable location, I may move to a SHT-30 (https://www.adafruit.com/product/4099). Would it be difficult to incorporate this sensor?

The system appears to be working great BTW, this is an extremely useful project.

@barista123
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Information and python library for the sensor can be found here

@barista123
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barista123 commented Jul 8, 2020 via email

@BenjiU BenjiU mentioned this issue Nov 4, 2020
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Feature/mcp3008 flyte/mqtt-io
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@barista123 @BenjiU