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diff --git a/_site/log/etlas/index.html b/_site/log/etlas/index.html deleted file mode 100644 index 68c19ae..0000000 --- a/_site/log/etlas/index.html +++ /dev/null @@ -1,153 +0,0 @@ -<!DOCTYPE html> -<html> - <head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1"> - <title>Etlas: e-paper dashboard</title> - <link rel="stylesheet" href="/assets/css/main.css"> - <link rel="stylesheet" href="/assets/css/skeleton.css"> -</head> - - - <body> - - <div id="nav-container" class="container"> - <ul id="navlist" class="left"> - - <li > - <a href="/" class="link-decor-none">hme</a> - </li> - <li > - <a href="/projects/" class="link-decor-none">poc</a> - </li> - <li > - <a href="/about/" class="link-decor-none">abt</a> - </li> - <li> - <a href="/cgi-bin/find.cgi" class="link-decor-none">lup</a> - </li> - <li> - <a href="/feed.xml" class="link-decor-none">rss</a> - </li> - </ul> -</div> - - - - <main> - <div class="container"> - <div class="container-2"> - <h2 class="center" id="title">ETLAS: E-PAPER DASHBOARD</h2> - <h5 class="center">05 SEPTEMBER 2024</h5> - <br> - <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;"> - <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> - <tr style="border: none;"> - <td colspan="2" style="border: none;"><img src="etlas_arch.png" alt="front" style="width: 100%" /></td> - </tr> -</table> - -<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() plots a stepped graph; was easier to implement, but the code -is hideous; triggers watchdog. vTaskDelay() prevents that.</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> - -<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static inline int dht_await_pin_state(int state, int timeout) -{ - int t; - static const uint16_t delta = 1; - - for (t = 0; t < timeout; t += delta) { - ets_delay_us(delta); - if (gpio_get_level(DHT_PIN) == state) - return t; - } - return 0; -} - -static inline int dht_get_raw_data(unsigned char buf[BUFLEN]) -{ - int rc; - unsigned char i, pwl, pwh; - - gpio_set_level(DHT_PIN, 0); - ets_delay_us(1100); - gpio_set_level(DHT_PIN, 1); - - if (!dht_await_pin_state(0, 40)) { - rc = 1; - xQueueSend(dht_evt_queue, &rc, (TickType_t) 0); - return 0; - } - if (!dht_await_pin_state(1, 80)) { - rc = 2; - xQueueSend(dht_evt_queue, &rc, (TickType_t) 0); - return 0; - } - if (!dht_await_pin_state(0, 80)) { - rc = 3; - xQueueSend(dht_evt_queue, &rc, (TickType_t) 0); - return 0; - } - - for (i = 0; i < BUFLEN; i++) { - if (!(pwl = dht_await_pin_state(1, 50))) { - rc = 4; - xQueueSend(dht_evt_queue, &rc, (TickType_t) 0); - return 0; - } - if (!(pwh = dht_await_pin_state(0, 70))) { - rc = 5; - xQueueSend(dht_evt_queue, &rc, (TickType_t) 0); - return 0; - } - buf[i] = pwh > pwl; - } - return 1; -} -</code></pre></div></div> - -<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> - -<p>Commit: -<a href="https://git.asciimx.com/etlas/commit/?id=a92c86ac1592c2137d3d1fec1668eacc2d0ca581">a92c86a</a></p> -</div> - <p class="post-author right">by W. D. Sadeep Madurange</p> - </div> - </div> - </main> - - <div class="footer"> - <div class="container"> - <div class="twelve columns right container-2"> - <p id="footer-text">© ASCIIMX - 2026</p> - </div> - </div> -</div> - - - </body> -</html> |