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-<p>Etlas is a news, stock market, and weather tracker powered by an ESP32 NodeMCU
-D1, featuring a 7.5-inch Waveshare e-paper display and a DHT22 sensor module.</p>
-
-<table style="border: none;">
-  <tr style="border: none;">
-    <td style="border: none;"><img src="dash.jpg" alt="front" style="width: 100%" /></td>
-    <td style="border: none;"><img src="pcb.jpg" alt="back" style="width: 100%" /></td>
-  </tr>
-</table>
-
-<p>The top left panel displays the end-of-day stock prices from the Polygon.io API, relayed through my own
-FastCGI-wrapped Flask app hosted on a VPS. The stock symbols can be configured
-through the Flask app’s application settings. The server.fcgi script enclosed
-in the tarball at the end of the page contains the Flask app.</p>
-
-<p>The following diagram outlines this system architecture.</p>
-
-<p><img src="etlas_arch.png" alt="architecture" /></p>
-
-<p>Unlike my <a href="/projects/e-reader">e-reader</a>, which worked with raster images,
-Etlas downloads time series data as CSV and computes the price curves on the
-ESP32.</p>
-
-<p>The more prominent panel on the right of the e-paper display shows local
-(Singapore) and world news from the Channel News Asia RSS feed. The MCU
-downloads and parses XML data from the RSS feed directly before rendering it to
-the display. Although I did it this way to avoid writing server code, it limits
-the feeds from which Etlas can receive data. In a future version, I will relay
-the RSS feed through a server (like the stock prices) to make it more flexible.</p>
-
-<p>The bottom panels (middle and right) display the temperature and relative
-humidity from a DHT22 sensor. The DHT22 driver, arguably the most interesting
-part of the software, reads real-time sensor data by comparing relative pulse
-widths. The pulses themselves are too quick for the ESP32 to reliably measure
-directly. I ported this
-implementation for ESP8266 modules to my ESP32. All credit for the algorithm
-belongs to them.</p>
-
-<p>Much of the heavy lifting of acquiring, interpreting, and rendering data from
-different data sources is performed on the microcontroller using less than 512
-KB of memory. The embedded software that makes that possible is written in C
-using the ESP-IDF v5.2.1. My e-paper display driver is a port of Waveshare examples for Arduino
-and STM32 platforms.</p>
-
-<p>I’ve been using Etlas daily (for a couple of hours on weekdays and all day on
-weekends) since August 2024. As of October 2025, it’s been running reliably for
-over a year. If you are interested in an e-paper display like this, drop me an
-email at the address on my home page.</p>
-
-<p>Files: <a href="source.tar.gz">source.tar.gz</a></p>