* https://www.raspberrypi.org/products/sense-hat/# SensoR ImU 
  * https://www.raspberrypi.org/documentation/hardware/sense-hat/
  * https://github.com/astro-pi/python-sense-hat
  * https://projects.raspberrypi.org/en/projects/getting-started-with-the-sense-hat

<code>
    sudo apt-get install sense-hat

cat <<EOF>  ~/example.py 
from sense_hat import SenseHat
from pprint import pprint

sense = SenseHat()

pprint(vars(sense))

print("Humidity: %s %%rH" % sense.humidity)
print("Temperature: %s C" % sense.temperature)
print("Temperature: %s C" % sense.get_temperature_from_humidity())
print("Temperature: %s C" % sense.get_temperature_from_pressure())
print("Pressure: %s Millibars" % sense.get_pressure())
sense.set_imu_config(False, True, False)  # gyroscope only
print(sense.orientation_radians)
print(sense.get_orientation_degrees())
print("North: %s" % sense.get_compass())
EOF
</code>

<code>
Humidity: 39.5838356018 %rH
Temperature: 31.6538200378 C
Temperature: 31.6538200378 C
Temperature: 30.1583328247 C
Pressure: 1017.19091797 Millibars
{'yaw': 0.0, 'roll': 0.0, 'pitch': 0.0}
{'yaw': 359.99058432743004, 'roll': 359.9998950151144, 'pitch': 359.9932170522769}
North: 359.751439678
</code>

===== WebThing =====

  * https://github.com/mozilla-iot/webthing-python/

<code>
pip3 install webthing
wget https://raw.githubusercontent.com/mozilla-iot/webthing-python/master/example/single-thing.py
python3 single-thing.py
</code>

<code>

cat simplest-thing.py
from __future__ import division
from webthing import (Action, Event, Property, SingleThing, Thing, Value,
                      WebThingServer)
import logging
import time
import uuid


def make_thing():
    thing = Thing(
        'urn:dev:ops:my-actuator-1234',
        'ActuatorExample',
        ['OnOffSwitch'],
        'An actuator example that just log'
    )

    thing.add_property(
        Property(thing,
                 'on',
                 Value(True, lambda v: print('On-State is now', v)),
                 metadata={
                     '@type': 'OnOffProperty',
                     'title': 'On/Off',
                     'type': 'boolean',
                     'description': 'An actuator example that just log',
                 }))
    return thing


def run_server():
    thing = make_thing()

    # If adding more than one thing, use MultipleThings() with a name.
    # In the single thing case, the thing's name will be broadcast.
    server = WebThingServer(SingleThing(thing), port=8888)
    try:
        logging.info('starting the server')
        server.start()
    except KeyboardInterrupt:
        logging.info('stopping the server')
        server.stop()
        logging.info('done')


if __name__ == '__main__':
    logging.basicConfig(
        level=10,
        format="%(asctime)s %(filename)s:%(lineno)s %(levelname)s %(message)s"
    )
    run_server()




curl http://localhost:8888/properties
{"on": true}

curl -X PUT -d '{"on": false}'  http://localhost:8888/properties/on


python3 ./simplest-thing.py
2020-04-23 21:16:30,954 simplest-thing.py:37 INFO starting the server
2020-04-23 21:16:31,784 selector_events.py:53 DEBUG Using selector: EpollSelector
2020-04-23 21:16:33,379 web.py:2250 INFO 200 GET / (192.168.1.28) 7.72ms
2020-04-23 21:16:33,404 web.py:2250 INFO 200 GET /properties/on (192.168.1.28) 4.68ms
2020-04-23 21:16:35,229 web.py:2250 INFO 200 GET /properties (::1) 3.99ms
2020-04-23 21:16:52,116 web.py:2250 WARNING 405 PUT /properties (::1) 5.13ms
2020-04-23 21:16:54,006 web.py:2250 WARNING 405 PUT /properties (::1) 4.05ms
On-State is now False
2020-04-23 21:16:56,366 web.py:2250 INFO 200 PUT /properties/on (::1) 11.06ms
</code>


==== gatwwat ====

<code>
https://github.com/mozilla-iot/gateway/releases//download/0.12.0/gateway-0.12.0.img.zip

"WebThings Gateway 63CE"

http://gateway.local/

WiFi Setup


Connecting to Wi-Fi…
Please ensure you are connected to the same network and then navigate to ⁨gateway.local⁩ in your web browser to continue setup.



mkdir -p ~/sense-hat-webthing
cd ~/sense-hat-webthing
pip3 install webthing


===== LINKS ======

  * https://magpi.raspberrypi.org/issues/93/pdf
  * https://libraries.io/github/WatPi/WatPi
  * https://www.raspberrypi.org/forums/viewtopic.php?f=104&t=109064&p=750616#p810193
  * https://github.com/balena-io-playground/node-sense-hat#
  * https://www.magnetic-declination.com/#