Office Meeting Sensor post

content/blog/2022-11-04_office-meeting-sensor.rst

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+Office Meeting Sensor
+#####################
+:author: tyrel
+:category: Tech
+:tags: python, nodered, home-assistant, automation
+:status: published
+
+NOTES
+=====
+
+
+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.
+
+Bill of Materials
+=================
+
+* `Raspberry Pi Zero W H (WiFi + Headers) <https://www.adafruit.com/product/3708>`_
+* `BlinkT LED Strip GPIO <https://shop.pimoroni.com/products/blinkt>`_
+
+Home Assistant Parts
+====================
+
+Third Party Plugin Requirements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* `Node-RED <https://community.home-assistant.io/t/home-assistant-community-add-on-node-red/55023>`_
+* `HACS <https://hacs.xyz/>`_
+* `Mosquitto <https://github.com/home-assistant/addons/blob/master/mosquitto/DOCS.md>`_
+
+Zoom Plugin
+~~~~~~~~~~~
+
+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.
+
+Pi Zero
+~~~~~~~
+
+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.
+
+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.
+
+I then added a new service in systemd to control the mqtt server
+
+.. code:: ini
+
+  [Unit]
+  Description=Meeting Indicator
+  
+  [Service]
+  Type=simple
+  ExecStart=/usr/bin/python2 /home/pi/mqtt.py
+  WorkingDirectory=/home/pi/Pimoroni/blinkt/examples
+  Restart=always
+  RestartSec=2
+  
+  [Install]
+  WantedBy=sysinit.target
+
+
+Pleased with the results, and testing by sending some messages over mqtt that changed the color, I then dove into Node-RED
+
+Node-Red
+~~~~~~~~
+
+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.
+
+When either of these are True, they call first my ceiling light to turn on, which next will then add a ``msg.payload`` of 
+
+.. code:: 
+
+  rgb,0,255,0,0
+  rgb,1,255,0,0
+  rgb,2,255,0,0
+  rgb,3,255,0,0
+  rgb,4,255,0,0
+  rgb,5,255,0,0
+  rgb,6,255,0,0
+  rgb,7,255,0,0
+
+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.
+
+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.
+
+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.
+
+Images
+~~~~~~
+
+.. figure:: {static}/images/2022/11/04_nodered.png
+   :alt: Screenshot of Nodered, with the flow of control for turning on the lights.
+
+.. figure:: {static}/images/2022/11/04_lights.jpg
+   :alt: wall mounted enclosure with a strip of LED lights.
+
+Videos
+~~~~~~
+
+* https://i.imgur.com/kKIafiI.mp4
+* https://i.imgur.com/DLypDGD.mp4
+
+Source
+~~~~~~
+
+Nodered configuration source json https://gist.github.com/tyrelsouza/c94329280848f0319d380cc750e995c2
+