I think it's cool to be able to create various diagrams just by declaring them in plain text. The first tool which I was using is PlantUML. Then I discovered MermaidJS, which is nicely supported by Typora. It's even possible to render diagrams in the supported browsers. This allows the interactive elements and nice stylings. The graph below is an attempt to visualize the data flow and feedback loops for some of my gadgets.

%% If you read this text, it means MermaidJS does not work in this browser as expected :( graph LR subgraph Digital Organs subgraph Long-Term Memory Player[Cowon Plenue D] click Player "http://www.cowonglobal.com/product_wide/PLENUED/product_page_1.php" Camera[Lumix DMC TZ-80] click Camera "https://www.panasonic.com/au/consumer/lumix-cameras-video-cameras/lumix-digital-cameras/dmc-tz80.html" Recorder[Zoom H2n] click Recorder "https://www.zoom.co.jp/products/handy-recorder/h2n-handy-recorder" Reader[Kobo Aura One] click Reader "https://us.kobobooks.com/collections/ereaders/products/kobo-aura-one-limited-edition" end subgraph Speakers Speaker[Logitech G560] click Speaker "https://www.logitechg.com/en-us/products/gaming-audio/g560-rgb-gaming-speakers.html" Speaker2[JBL Playlist 150] click Speaker2 "https://www.jbl.com/home-speakers-2/JBL+PLAYLIST+150.html" end subgraph Screens Projector[Optoma GT1080e] click Projector "https://www.optoma.co.uk/product-details/GT1080e" Monitor[LG 27UD88-W] click Monitor "https://www.lg.com/us/monitors/lg-27UD88-W-4k-uhd-led-monitor" end Flashlight[Fenix BC30] click Flashlight "https://www.fenix-store.com/fenix-bc30-led-bike-light/" end subgraph Input I-Audial[Audial] I-Audiovisual[Audiovisual] end subgraph Output Audial Audiovisual subgraph Visual Text White end end %% Channels Monitor --> Audiovisual Speaker ==> Audial Speaker2 --> Audial Projector --> Audiovisual I-Audiovisual ==> Camera Camera --> Audiovisual I-Audial ==> Recorder Recorder --> Audial Player --> Audial Reader ==> Text Flashlight --> White