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Diffstat (limited to '_site/log/etlas/index.html')
| -rw-r--r-- | _site/log/etlas/index.html | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/_site/log/etlas/index.html b/_site/log/etlas/index.html index f618503..68c19ae 100644 --- a/_site/log/etlas/index.html +++ b/_site/log/etlas/index.html @@ -40,9 +40,9 @@ <h2 class="center" id="title">ETLAS: E-PAPER DASHBOARD</h2> <h5 class="center">05 SEPTEMBER 2024</h5> <br> - <div class="twocol justify"><p>Repurposed <a href="../e-reader/">e-reader prototype</a> into something for regular use. -News, stocks, weather dashboard. ESP32 NodeMCU D1 + 7.5” Waveshare e-paper + -DHT22 sensor.</p> + <div class="twocol justify"><p>Repurposed the <a href="../e-reader/">e-reader</a> into something for regular use. News, +stocks, weather dashboard. ESP32 NodeMCU D1 + 7.5” Waveshare e-paper + DHT22 +sensor.</p> <table style="border: none;"> <tr style="border: none;"> @@ -54,18 +54,21 @@ DHT22 sensor.</p> </tr> </table> -<p>Stocks: Two weeks EOD prices from Polygon.io (max possible). Flask app on VPS -relays feed; manages watchlist. Backend: httpd + htpasswd + FastCGI + Flask.</p> +<p>Stocks: Two weeks EOD data from Polygon.io (max possible). Flask app on VPS +manages watchlist, relays the feed. Backend: httpd + htpasswd + slowcgi + +Flask.</p> -<p>gui_plot_stocks() triggers watchdog; vTaskDelay() required. Stepped graph was -easier to implement (under memory constraints), but the logic is hideous. Note -to self: Refactor with Bresenham’s?</p> +<p>gui_plot_stocks() plots a stepped graph; was easier to implement, but the code +is hideous; triggers watchdog. vTaskDelay() prevents that.</p> -<p>News: Channel NewsAsia RSS. MCU parses XML directly. Character glyphs stored as -bitmaps in header files.</p> +<p>NOTE: Refactor. Bresenham’s?</p> + +<p>News: Channel NewsAsia RSS. MCU does the parsing. Didn’t plan to have a backend +at the time. Now that I have one for stocks, should relay the feed for +flexibility.</p> <p>Weather: DHT22 single-wire protocol. 26µs/50µs/70µs pulses are too fast for -standard ESP32 APIs. Bit-banged relative pulse widths: (Ported from <a href="https://github.com/Fonger/ESP8266-RTOS-DHT" class="external" target="_blank" rel="noopener noreferrer">ESP8266</a>):</p> +standard ESP32 APIs. Bit-banged relative pulse widths (ported from <a href="https://github.com/Fonger/ESP8266-RTOS-DHT" class="external" target="_blank" rel="noopener noreferrer">ESP8266</a>):</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static inline int dht_await_pin_state(int state, int timeout) { @@ -122,10 +125,10 @@ static inline int dht_get_raw_data(unsigned char buf[BUFLEN]) } </code></pre></div></div> -<p>Ghost in the machine: epd_init() stalls intermittently on first refresh() after -flash. Toggling delay values in refresh() resolves it. If first refresh -succeeds, it remains stable. Root cause unknown–suspected power supply issues -from powering display via MCU.</p> +<p>epd_init() stalls intermittently on first refresh() after flash. Toggling delay +values in refresh() resolves it. If the first refresh succeeds, it remains +stable. Root cause unknown–suspect noisy power supply due to powering display +via MCU.</p> <p>Uptime: August 2024 - January 2026</p> |