106 lines
3.9 KiB
ReStructuredText
106 lines
3.9 KiB
ReStructuredText
Office Meeting Sensor
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#####################
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:author: tyrel
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:category: Tech
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:tags: python, nodered, home-assistant, automation
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:status: published
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NOTES
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=====
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This post is ported over from my wiki, so the format isn't as storytelling as a blog post could be, but I wanted it here.
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Bill of Materials
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=================
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* `Raspberry Pi Zero W H (WiFi + Headers) <https://www.adafruit.com/product/3708>`_
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* `BlinkT LED Strip GPIO <https://shop.pimoroni.com/products/blinkt>`_
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Home Assistant Parts
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====================
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Third Party Plugin Requirements
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* `Node-RED <https://community.home-assistant.io/t/home-assistant-community-add-on-node-red/55023>`_
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* `HACS <https://hacs.xyz/>`_
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* `Mosquitto <https://github.com/home-assistant/addons/blob/master/mosquitto/DOCS.md>`_
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Zoom Plugin
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~~~~~~~~~~~
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I followed the Read Me from https://github.com/raman325/ha-zoom-automation#installation-single-account-monitoring and set up a Zoom Plugin for my account, that will detect if I am in a meeting or not.
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Pi Zero
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~~~~~~~
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I have a tiny project Enclosure box that I dremeled a hole for the GPIO pins in the cover and I then sandwich the Blinkt onto the Pi Zero with another dremeled hole running to the micro usb power, and that's it for hardware.
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For software, I installed the python packages for Pimoroni and Blinkt, which came with a lovely set of sample projects. I deleted everything except the `mqtt.py <https://github.com/pimoroni/blinkt/blob/master/examples/mqtt.py>`_ file, which I then put my Mosquitto server settings.
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I then added a new service in systemd to control the mqtt server
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.. code-block:: ini
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[Unit]
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Description=Meeting Indicator
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[Service]
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Type=simple
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ExecStart=/usr/bin/python2 /home/pi/mqtt.py
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WorkingDirectory=/home/pi/Pimoroni/blinkt/examples
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Restart=always
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RestartSec=2
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[Install]
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WantedBy=sysinit.target
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Pleased with the results, and testing by sending some messages over mqtt that changed the color, I then dove into Node-RED
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Node-Red
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~~~~~~~~
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This is my first project using Node-RED, so I'm sure I could optimize better, but I have two entry points, one is from running HomeAssistant app on my mac, which gets me sensor data for my webcam, and the other is the aforementioned Zoom Presence plugin I created. These are ``Events:State`` nodes.
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When either of these are True, they call first my ceiling light to turn on, which next will then add a ``msg.payload`` of
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.. code::
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rgb,0,255,0,0
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rgb,1,255,0,0
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rgb,2,255,0,0
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rgb,3,255,0,0
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rgb,4,255,0,0
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rgb,5,255,0,0
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rgb,6,255,0,0
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rgb,7,255,0,0
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as one string. This leads to a Split, which will in turn, emit a new MQTT message for each line (I split on ``\n``) and turn on all 8 LEDs as red. This is inefficient because I am still using the sample code for the blinkt which requires you to address each LED individually, my next phase I will remove the pin requirement and just have it send a color for all of them at once, one line.
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When either of the sensors states are False, I then flow into a Time Range node, in which I check if it's between 9-5 or not. If it is, then I turn all the LEDs Green, and if it's outside 9-5 I just turn the LEDs off. I do not turn OFF the overhead light, in case it was already on. I don't care about the state enough.
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I also intentionally trigger at the Office Hours node, which will inherently turn the Green on at 9:01am, and off at 5:01pm. As well as turn on Red for any long standing meeting times I have.
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Images
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~~~~~~
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.. figure:: {static}/images/2022/11/04_nodered.png
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:alt: Screenshot of Nodered, with the flow of control for turning on the lights.
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.. figure:: {static}/images/2022/11/04_lights.jpg
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:alt: wall mounted enclosure with a strip of LED lights.
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Videos
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~~~~~~
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* https://i.imgur.com/kKIafiI.mp4
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* https://i.imgur.com/DLypDGD.mp4
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Source
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~~~~~~
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Nodered configuration source json https://gist.github.com/tyrelsouza/c94329280848f0319d380cc750e995c2
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