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simulations
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w_conn_strip.pretty
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LICENSE
LICENSE
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini

Repository files navigation

OpenFlowMeter

Purpose

Measuring flow of gases and maybe liquids.

Principle

Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.

Hardware

The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller. The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.

Photographs of the populated PCB

Picture of the PCB from TOP side

Picture of the PCB from BOT side

References

The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.

[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001

[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001

PCBs

PCBs are available from AISLER https://aisler.net/p/MVHMBVKT

About

Measuring Flow

Topics

anemometercancan-busflowmeterkicadstm32stm32f103

Resources

Readme
GPL-3.0 license
Activity

Stars

6 stars

Watchers

1 watching

Forks

1 fork
Report repository

Releases

Packages

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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OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, '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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OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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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OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, '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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LICENSE
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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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w_conn_strip.pretty
w_conn_strip.pretty
.gitignore
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LICENSE
LICENSE
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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('^' + ".*" + '

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images
output/ibom
output/ibom
simulations
simulations
software
software
w_conn_strip.pretty
w_conn_strip.pretty
.gitignore
.gitignore
.gitmodules
.gitmodules
LICENSE
LICENSE
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_pcb
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
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, '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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OpenFlowMeter.kicad_pcb
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OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_prl
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_pro
OpenFlowMeter.kicad_sch
OpenFlowMeter.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_Controller.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_CurrentSource.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_I2Ccomponents.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
OpenFlowMeter_PWM_Filter.kicad_sch
README.md
README.md
SwitchGainAmp.kicad_sch
SwitchGainAmp.kicad_sch
differential_ampl.kicad_sch
differential_ampl.kicad_sch
fp-lib-table
fp-lib-table
ibom.config.ini
ibom.config.ini
Repository files navigation
OpenFlowMeter
Purpose
Measuring flow of gases and maybe liquids.
Principle
Measures the volume flow by the amount of heat transferred to a gas flow. This can be either done by constantly heating the sensor or by evaluating temperature cycles.
Hardware
The hardware is based around two voltage controlled current sources, which are controlled and readout via a STM32F103 microcontroller.
The controller provides the ADCs for reading the voltages and current as well as the digital communication to the outside of the PCB.
Photographs of the populated PCB
Picture of the PCB from TOP side
Picture of the PCB from BOT side
References
The working principle of this device is adapted from a proposal of the LHC gas group at CERN. In addition there is a report of a student, explaining / proposing this technique more in detail.
[1] M. van der Klis. PT100 channel flow meter for the LHC experiments, Technical Student Report Feb. 2001
[2] F.Hahn, S.Haider, M. v.d. Klis, C. Zinoni, Proposal for a gas flow meter at LHC, 10.2.2001
PCBs
PCBs are available from AISLER https://aisler.net/p/MVHMBVKT
About
Measuring Flow
Topics
anemometercancan-busflowmeterkicadstm32stm32f103
Resources
Readme
GPL-3.0 license
Activity
Stars
6 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages