Sense Hat support on Raspberry Pi

robinnelson99 · March 28, 2019, 6:48pm

Thank you for your response. I am not sure where I would edit the code once I have run the sense-hat plugin commands in the terminal. I am familiar with the sense-hat python code and can run it on the sense-hat’s 8x8 LED, but not sure how to then have Cayenne report onto 8 x 8 LED screen.

I checked out the Git hub example scripts and they are great! Do I just run them from the Rasberry Pi in Python 3 or Thonny?

Sorry, I am not more knowledgeable.

shramik_salgaonkar · March 29, 2019, 10:34am

which method do you want to use? 1 or 2 ?

robinnelson99 · March 29, 2019, 11:23am

Let’s use 1

shramik_salgaonkar · March 29, 2019, 11:50am

there are two things you need to do:

add images in the folder /etc/myDevices/plugins/cayenne-plugin-sensehat/data
edit the code in sudo nanno /etc/myDevices/plugins/cayenne-plugin-sensehat/sensehat/__init__.py

need to initialize the image file path.

def init(self, use_emulator=False):
“”“Initializes Sense HAT device.
Arguments:
use_emulator: True if the Sense HAT Emulator should be used. This requires the Emulator to be installed and running on the desktop.
“””
self.use_emulator = use_emulator
self.sense_hat = None
self.digital_value = 0
self.analog_value = 0.0
self.image_file = os.path.join(‘/etc/myDevices/plugins/cayenne-plugin-sensehat/data/image.png’)
self.image_file_temp = os.path.join(‘/etc/myDevices/plugins/cayenne-plugin-sensehat/data/image_temp.png’)
self.call_sense_hat_function(‘clear’)
need to edit the sensor function:

def get_temperature(self):
“”“Gets the temperature as a tuple with type and unit.”“”
temp = self.call_sense_hat_function(‘get_temperature’)
if ( temp > 50):
self.call_sense_hat_function(‘load_image’, self.image_file_temp)
else:
self.call_sense_hat_function(‘clear’)
return (temp, ‘temp’, ‘c’)

similarly, you have to do for other function.
i have not tested the code, so might give you some error

robinnelson99 · March 29, 2019, 12:13pm

shramik_salgaonkar thank you so much for your detailed information and help. I will give it a shot later today and let you know how it went! Thanks again!

bubba198 · May 31, 2020, 2:11pm

Any updates on adding native support by the agent for Sense Hat?

shramik_salgaonkar · May 31, 2020, 6:18pm

bubba198 · July 2, 2020, 11:40pm

Hi everyone, I did the plug-in, works, except I do not see any of the sensor data? Here’s what it looks like?

shramik_salgaonkar · July 3, 2020, 10:18am

can you share the logs after restarting the agent,

sudo service myDevices restart
tail -f /var/log/myDevices/cayenne.log

bubba198 · July 3, 2020, 1:38pm

Hi

Thank you, below is the log:

2020-07-03 06:35:11 - myDevices - INFO - Sensors info: []
2020-07-03 06:35:11 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:11 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:11 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:11 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:11 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:11 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:11 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:11 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:11 - myDevices - INFO - Send changed data: [{'sys:cpu;load': 16.5}, {'sys:cpu;temp': 48.85}, {'sys:ram;usage': 302604288}, {'sys:storage:/;usage': 3119116288}, {'sys:net;ip': '192.168.166.94'}, {'dev:sensehat:4': 0}, {'dev:sensehat:5': 0.0}] + sys:gpio
2020-07-03 06:35:26 - myDevices - ERROR - Failed to get sensor data: Temperature GGMMo5GMCJpwLKG
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/sensors/sensors.py", line 322, in SensorsInfo
    value = self.CallDeviceFunction(func)
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/sensors/sensors.py", line 264, in CallDeviceFunction
    result = func(*args)
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/devices/sensor/__init__.py", line 116, in getCelsius
    return self.__getCelsius__()
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/devices/sensor/tmpXXX.py", line 48, in __getCelsius__
    d = self.readBytes(2)
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/devices/bus.py", line 157, in readBytes
    return bytearray(self.readDevice(size))
  File "/usr/local/lib/python3.7/dist-packages/myDevices-2.0.4-py3.7.egg/myDevices/devices/bus.py", line 153, in readDevice
    return os.read(self.fd, size)
OSError: [Errno 121] Remote I/O error
2020-07-03 06:35:26 - myDevices - INFO - Sensors info: []
2020-07-03 06:35:26 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:26 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:26 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:26 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:26 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:26 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:26 - myDevices - INFO - Sense HAT service connection refused
2020-07-03 06:35:26 - myDevices - ERROR - [Errno 111] Connection refused
2020-07-03 06:35:26 - myDevices - INFO - Send changed data: [{'sys:cpu;load': 0.0}, {'sys:cpu;temp': 45.084}, {'sys:ram;usage': 302784512}]

shramik_salgaonkar · July 3, 2020, 1:56pm

Are you using raspbian buster? see if you can get it to work with this tutorial https://projects.raspberrypi.org/en/projects/getting-started-with-the-sense-hat/3

bubba198 · July 3, 2020, 2:07pm

Yep, I am. The Hat works otherwise, I can pull temperatures with example py code, all sensors work. I can even get it to work to Cayenne using a separate py script that pulls and sensors and dumps them into a “custom device” which I have created. What does not work is the GitHub “official” plug-in for Sense Hat.

Here’s my custom device which I had to create with a py script - works like a charm. I am bringing this issue up as a possible defect in the GitHub - myDevicesIoT/cayenne-plugin-sensehat: A Sense HAT plugin for Cayenne

shramik_salgaonkar · July 3, 2020, 2:13pm

okay. thank for pointing out. we will look into it.

shramik_salgaonkar · July 14, 2020, 4:24pm

@bubba198 can you run groups cayenne and share what it returns.

bubba198 · July 14, 2020, 4:59pm

@shramik_salgaonkar here it is:

pi@raspberrypi:~ $ groups cayenne
cayenne : cayenne spi i2c gpio
pi@raspberrypi:~ $

shramik_salgaonkar · July 14, 2020, 6:11pm

can you check if /usr/bin/python3 -m sensehat.startservice is running and if so under what user

bubba198 · July 14, 2020, 6:40pm

@shramik_salgaonkar strange output, I have most definitively NOT setup an emulator, I am using real bare metal Sense Hat. Could the default install of the plugin assumes emu?

   pi@raspberrypi:~ $ /usr/bin/python3 -m sensehat.startservice
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 "/usr/local/lib/python3.7/dist-packages/sensehat-0.1.0-py3.7.egg/sensehat/startservice.py", line 9, in <module>
  File "/usr/local/lib/python3.7/dist-packages/sensehat-0.1.0-py3.7.egg/sensehat/manager.py", line 35, in start_server
  File "/usr/local/lib/python3.7/dist-packages/sensehat-0.1.0-py3.7.egg/sensehat/manager.py", line 24, in use_emulator
ModuleNotFoundError: No module named 'sense_emu'

shramik_salgaonkar · July 14, 2020, 7:28pm

what is the output of dpkg-query -s sense-hat

bubba198 · July 14, 2020, 7:30pm

@shramik_salgaonkar Thanks for the quick reply, below:

pi@raspberrypi:~ $ dpkg-query -s sense-hat
Package: sense-hat
Status: install ok installed
Priority: optional
Section: misc
Installed-Size: 111
Maintainer: Serge Schneider <serge@raspberrypi.org>
Architecture: all
Version: 1.2
Depends: raspberrypi-bootloader (>= 1.20150820-1), librtimulib-dev, python-sense-hat, python3-sense-hat
Recommends: librtimulib-utils
Conffiles:
 /etc/RTIMULib.ini c8bc7ab2e1ca339eb6b463563bacbfd3
Description: Sense HAT configuration, libraries and examples
 Configures the Sense HAT, installs RTIMULib and Astro Pi libraries, calibration
 data and example code.
pi@raspberrypi:~ $

shramik_salgaonkar · July 14, 2020, 7:31pm

check if you have /usr/lib/python3/dist-packages/sense_emu or /usr/lib/python3/dist-packages/sense_hat directories

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