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hc-sr04

Distance Sensor

Measure and calibrate distance sensor data using and show in a web page.

🎴 Preview

Dashboard

✨ Features

  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.

🖥️ Systems

  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.

📚 How it work?

This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.

Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.

Project Architecture

Attention: Each folder has a specific functionality related to the project, they also have a readme file.

About

Measure and calibrate distance sensor data using and show in a web page.

Topics

apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt

Resources

Readme
Activity

Stars

1 star

Watchers

1 watching

Forks

1 fork
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
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Used by
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
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Used by
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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19 Commits
Folders and files
NameName
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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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19 Commits
Folders and files
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esp32
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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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19 Commits
Folders and files
NameName
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esp32
esp32
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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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README.md
Repository files navigation
hc-sr04
Distance Sensor
Measure and calibrate distance sensor data using and show in a web page.
🎴 Preview
Dashboard
✨ Features
  • 📏 Measurement and calibration of the HC-SR04 sensor;
  • 📶 Communication via MQTT protocol and API;
  • 📈 Dashboard made through a web page.
🖥️ Systems
  • ESP32 Code;
  • Client MQTT;
  • API;
  • Web Page.
📚 How it work?
This project aims to collect measurements from the HC-SR04 ultrasonic sensor, sending them to an MQTT Broker, which in turn will provide the data to the MQTT Client, which will be responsible for performing the calibration based on the flight time received. After that, the Client will send the calibrated data to an API, which will register it in a database. Thus, a web application will consume this API and visually display the obtained data.
Calibration is done using statistical calculations such as linear regression to estimate the measurement, combined and expanded uncertainty to estimate measurement error.
Project Architecture
Attention: Each folder has a specific functionality related to the project, they also have a readme file.
About
Measure and calibrate distance sensor data using and show in a web page.
Topics
apicalibrationclientesp-idfesp32hc-sr04instrumentationmqtt
Resources
Readme
Activity
Stars
1 star
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Used by
Contributors
Languages