{"id":323,"date":"2026-08-02T12:45:43","date_gmt":"2026-08-02T12:45:43","guid":{"rendered":"https:\/\/blog.tehybug.com\/?p=323"},"modified":"2026-08-02T12:45:43","modified_gmt":"2026-08-02T12:45:43","slug":"new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival","status":"publish","type":"post","link":"https:\/\/blog.tehybug.com\/index.php\/2026\/08\/02\/new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival\/","title":{"rendered":"New TeHyBug Firmware \u2014 Reliable Light Sleep, Faster Wakes &#038; First-Gen Revival"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The firmware for the <strong>TeHyBug 18650 Universal<\/strong>, <strong>Mini TeHyBug<\/strong> and <strong>GumBoard<\/strong> has a new release \u2014 focused on rock-solid sleep, noticeably quicker wake-ups, and a big one for owners of the original first-generation TeHyBug.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\ude34 Light Sleep now sleeps the whole interval<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Light Sleep could occasionally wake far too early \u2014 a 60-second interval collapsing to a few seconds, with the device reporting (and burning battery) many times more often than configured. The sleep engine has been rebuilt: it now measures how long it actually slept, re-arms itself if it was woken early, and retries when the WiFi chip isn&#8217;t ready yet. Your configured interval is now the interval you get.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u26a1 Quicker, leaner wake-ups<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No more dead seconds.<\/strong> Fixed pauses after sending \u2014 measured at up to 40% of each wake spent doing nothing \u2014 are gone. The device sleeps the moment its work is done.<\/li>\n\n\n\n<li><strong>Light-sleep wake-ups rejoin your WiFi directly<\/strong> instead of searching for it, cutting several hundred milliseconds of radio time per wake.<\/li>\n\n\n\n<li><strong>No waiting for the MODE button on scheduled wakes.<\/strong> A device waking from deep sleep skips the button window entirely \u2014 see below for how to get into config mode instead.<\/li>\n\n\n\n<li><strong>The network address is kept fresh automatically<\/strong>, so a long-deployed device can no longer lose its DHCP lease mid-deployment.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd18 Getting into config mode on a sleeping device<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Since scheduled wakes no longer wait for the button: <strong>press RESET, then press MODE within a second<\/strong>. If the window doesn&#8217;t appear (some boards can&#8217;t tell a reset from a timer wake while asleep), <strong>press RESET twice about a second apart<\/strong>, then MODE \u2014 the second press is always recognised. Devices that are awake (live mode) behave as before.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddd3 First-generation TeHyBug: I2C sensors work now<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you have an original esp-01-based TeHyBug, this update matters more than any before it: the firmware had the two I2C wires <strong>swapped in software<\/strong>, so an I2C sensor plugged into a first-generation board was never detected \u2014 the scan simply reported an empty bus. That&#8217;s fixed, and the <strong>AHT20<\/strong> temperature\/humidity sensor is now fully supported on these boards too.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your old TeHyBug has been sitting in a drawer because &#8220;the sensor stopped working&#8221; \u2014 it very likely never was the sensor. Flash this firmware and plug it back in.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Either port, either way round.<\/strong> The two TeHyBug ports are wired as mirror images, and the old firmware quietly handled both. The new firmware now does too: it probes both orientations and finds your sensor whichever port it&#8217;s in.<\/li>\n\n\n\n<li><strong>DHT sensors get their warm-up time<\/strong> after power-up before the first read \u2014 the same timing the original firmware used.<\/li>\n\n\n\n<li>\u26a0\ufe0f <strong>Intervals are now in seconds, not minutes.<\/strong> If you re-enter settings from an old Lua-firmware device, remember your old &#8220;10&#8221; meant 10 minutes \u2014 enter 600 now, or the device will report 60\u00d7 more often than you intend.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f One change on these first-generation boards: <strong><code>tehybug.local<\/code> no longer works there<\/strong> \u2014 the memory it cost now pays for years of future updates on the small 1 MB chip. Reach the device by its IP address instead, which the device&#8217;s own config page shows you prominently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\uddc4\ufe0f Data log<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The 64 KB memory chip on current RTC modules is now fully used<\/strong> \u2014 day files grow from about 1 KB to about 2 KB. If your module has the larger chip, its log is re-arranged once on first boot and previously logged data is erased: <strong>download anything you want to keep first<\/strong>. Modules with the 32 KB chip keep their data.<\/li>\n\n\n\n<li>The Data Log page now shows <strong>which memory chip was detected<\/strong> and how much each day file holds.<\/li>\n\n\n\n<li>Placeholders for sensors the device doesn&#8217;t have (like a literal <code>%qfe%<\/code> with no pressure sensor) are no longer written into every log entry.<\/li>\n\n\n\n<li><strong>Factory reset now really erases the data log<\/strong> along with the settings.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udde9 The config portal writes your templates for you<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On the Data Serving page, each template field \u2014 the MQTT payload, the HTTP POST body and the GET query string \u2014 now has a <strong>&#8220;Fill from my sensors&#8221;<\/strong> link, in a <strong>metric or imperial<\/strong> flavour. The portal builds the template from the sensors your device is actually reporting right now: an AHT20-only bug suggests temperature and humidity, a BME680 bug gets pressure and air quality too, and a second sensor shows up with its own <code>t2=<\/code>\/<code>h2=<\/code> parameters instead of silently overwriting the first. No more memorising placeholder names.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This lives in the web portal, so it works with your existing firmware \u2014 no update needed for this one.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 Fixes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Home Assistant discovery can no longer send a truncated (broken) configuration<\/strong> \u2014 a sensor either appears correctly or the device tells you why it couldn&#8217;t.<\/li>\n\n\n\n<li><strong>Upgrading from the original Lua firmware?<\/strong> The stale duplicate entities it left behind in Home Assistant (stuck forever on their last value) are now cleaned up automatically.<\/li>\n\n\n\n<li><strong>DHT sensors are model-checked<\/strong> instead of assumed: a DHT11 on the &#8220;DHTXX&#8221; switch now actually reads.<\/li>\n\n\n\n<li>The device&#8217;s own page at <code>192.168.4.1<\/code> now leads with the address to reach it on your home network, instead of a blank &#8220;Loading\u2026&#8221; while connected to its access point.<\/li>\n\n\n\n<li>Release firmware is fully silent on the serial pins, and debug builds on first-generation boards no longer lose their log to the indicator LED.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to update<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f <strong>Only update when you need to.<\/strong> If your TeHyBug is working fine, there&#8217;s no need to chase every release \u2014 update when a new feature or fix actually matters to you. That said, if you use Light Sleep, run on battery, or own a first-generation board, this one is worth it.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Update over the air from the device&#8217;s web interface \u2014 open <strong><code>http:\/\/tehybug.local\/update<\/code><\/strong> (or <code>http:\/\/&lt;device-ip&gt;\/update<\/code>), sign in, and upload the latest firmware. Keep the device powered during the update; it reboots itself when done.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prefer to flash over USB? Use the <strong>BugZapper<\/strong> flasher, the Arduino IDE, or esptool \u2014 see the documentation for details.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Compatible with the TeHyBug 18650 Universal (v1 \/ v2), Mini TeHyBug and GumBoard, and generic ESP8266\/ESP8285 boards. Offline logging needs the RTC + EEPROM module.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Questions? Tap the <strong>AI assistant<\/strong> on tehybug.com or check the <a href=\"https:\/\/tehybug.com\/faq\">FAQ<\/a>. <em>Turning ideas into smart devices.<\/em><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>The firmware for the TeHyBug 18650 Universal, Mini TeHyBug and GumBoard has a new release \u2014 focused on rock-solid sleep, noticeably quicker wake-ups, and a big one for owners of the original first-generation TeHyBug. \ud83d\ude34 Light Sleep now sleeps the whole interval Light Sleep could occasionally wake far too early \u2014 a 60-second interval collapsing [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-323","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>New TeHyBug Firmware \u2014 Reliable Light Sleep, Faster Wakes &amp; First-Gen Revival - TeHyBug<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.tehybug.com\/index.php\/2026\/08\/02\/new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New TeHyBug Firmware \u2014 Reliable Light Sleep, Faster Wakes &amp; First-Gen Revival - TeHyBug\" \/>\n<meta property=\"og:description\" content=\"The firmware for the TeHyBug 18650 Universal, Mini TeHyBug and GumBoard has a new release \u2014 focused on rock-solid sleep, noticeably quicker wake-ups, and a big one for owners of the original first-generation TeHyBug. \ud83d\ude34 Light Sleep now sleeps the whole interval Light Sleep could occasionally wake far too early \u2014 a 60-second interval collapsing [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.tehybug.com\/index.php\/2026\/08\/02\/new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival\/\" \/>\n<meta property=\"og:site_name\" content=\"TeHyBug\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-02T12:45:43+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blog.tehybug.com\\\/index.php\\\/2026\\\/08\\\/02\\\/new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.tehybug.com\\\/index.php\\\/2026\\\/08\\\/02\\\/new-tehybug-firmware-reliable-light-sleep-faster-wakes-first-gen-revival\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/blog.tehybug.com\\\/#\\\/schema\\\/person\\\/28a0a4d33fc8f40b0b8384156417fb67\"},\"headline\":\"New TeHyBug Firmware \u2014 Reliable Light Sleep, Faster Wakes &#038; 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