https://sandhar.au/projects/ Recent content in Projects on Gurinder Sandhar Hugo en Fri, 14 Aug 2026 20:00:00 +1100 https://sandhar.au/projects/trmnl-diy-eink-dashboard/ Fri, 14 Aug 2026 20:00:00 +1100 https://sandhar.au/projects/trmnl-diy-eink-dashboard/ <p>Handy little dashboard that has been living on the fridge since May 2026 and saves me looking at the Sigenergy app every now and then. Today&rsquo;s section for Calendar shows 4 events, tomorrow shows 2, Sat/Sun each shows 2 events. Built on the <a href="https://wiki.seeedstudio.com/ogdiy_kit_works_with_esphome/" class="external-link" target="_blank" rel="noopener">TRMNL 7.5&quot; OG DIY Kit</a>. Shows weather and refreshes every 60 minutes via deep sleep.</p> <p><img alt="Dashboard Screenshot" src="../projects/trmnl-diy-eink-dashboard/dashboard.jpeg"></p> <h2 id="how-it-works"> How It Works <a class="heading-link" href="#how-it-works"> <i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"></i> <span class="sr-only">Link to heading</span> </a> </h2> <ol> <li>ESP32 wakes from deep sleep (every 60 min)</li> <li>Connects to WiFi, fetches sensor/text states from Home Assistant</li> <li>Renders the layout to the e-ink framebuffer</li> <li>E-ink updates (~10 seconds)</li> <li>Enters deep sleep to save battery</li> </ol> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">┌──────────────────────────────────────────────────────────┐ </span></span><span class="line"><span class="cl">│ Tuesday, 27 May [DevBat] │ </span></span><span class="line"><span class="cl">├──────────────────────┬───────────────────────────────────┤ </span></span><span class="line"><span class="cl">│ Today │ ☀️ (weather icon) │ </span></span><span class="line"><span class="cl">│ ───────── │ 22°C │ </span></span><span class="line"><span class="cl">│ 14:30 Meeting │ ▼12° ▲24° │ </span></span><span class="line"><span class="cl">│ All-day Birthday │ │ </span></span><span class="line"><span class="cl">│ │ ───────────────────────────── │ </span></span><span class="line"><span class="cl">│ Tomorrow │ 🔋 (battery icon) │ </span></span><span class="line"><span class="cl">│ ───────── │ 87% │ </span></span><span class="line"><span class="cl">│ 09:00 Standup │ Discharging │ </span></span><span class="line"><span class="cl">│ │ │ </span></span><span class="line"><span class="cl">│ Weekend │ │ </span></span><span class="line"><span class="cl">│ ───────── │ │ </span></span><span class="line"><span class="cl">│ Sat 31 May │ │ </span></span><span class="line"><span class="cl">│ All-day BBQ │ │ </span></span><span class="line"><span class="cl">│ Sun 1 Jun │ │ </span></span><span class="line"><span class="cl">│ No events │ │ </span></span><span class="line"><span class="cl">├──────────────────────┴───────────────────────────────────┤ </span></span><span class="line"><span class="cl">│ Built with ESPHome Refreshed at 08:15 │ </span></span><span class="line"><span class="cl">└──────────────────────────────────────────────────────────┘ </span></span></code></pre></div><h2 id="home-assistant-setup"> Home Assistant Setup <a class="heading-link" href="#home-assistant-setup"> <i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"></i> <span class="sr-only">Link to heading</span> </a> </h2> <h3 id="integrations"> Integrations <a class="heading-link" href="#integrations"> <i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"></i> <span class="sr-only">Link to heading</span> </a> </h3> <p>Ensure these are enabled in Home Assistant:</p>