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Temperature regulated PWM Fan Control with ATTiny 45/85

This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.

https://blog.podkalicki.com/attiny13-hardware-pwm/

The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:

http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/

https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp

The NTC conversion/correction to °C from 10bit ADC output was generated with this page: https://www.sebulli.com/ntc/index.php

The circuit and code should be self explanatory. Alt text

Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz. PWM1

PWM2

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Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought

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, '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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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
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arduinoattiny85avrfancontrolplatformiopwm
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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); }
})();
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var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
Topics
arduinoattiny85avrfancontrolplatformiopwm
Resources
Readme
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, '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); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
Topics
arduinoattiny85avrfancontrolplatformiopwm
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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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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
Topics
arduinoattiny85avrfancontrolplatformiopwm
Resources
Readme
Activity
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, '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); }
})();
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var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
Topics
arduinoattiny85avrfancontrolplatformiopwm
Resources
Readme
Activity
Stars
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, '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); }
})();
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try {
var __m = "*";
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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
About
Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
Topics
arduinoattiny85avrfancontrolplatformiopwm
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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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Temperature regulated PWM Fan Control with ATTiny 45/85
This is a simple circuit to drive an 4-Pin PWM Fan using an ATtiny 45. With an Arduino Uno the first code was running after 30 minutes, but I would like to use a very small circuit in my gaming PC, so I tried to adopt it to some left over ATTinys. It was not as easy as I thought, because fast PWM on ATtiny needs special setup of some registers. The best description I found was on this website, which sets the PWM to 32 kHz, with 8Mhz F_CPU and no CKLDIV, which is a little bit higher than 25 kHz needed for the PWM of the Fan, but it worked with full duty cycle.
https://blog.podkalicki.com/attiny13-hardware-pwm/
The second challenge was that Arduiono analogread() did not work on the ATtiny at all. I found an alternative way on the following page:
http://www.hilltop-cottage.info/blogs/adam/avr-adc-1-basic-examples-attiny85/
https://github.com/arc12/AVR-Experiments-and-Examples/blob/master/ADC%20Tiny85/ADC%20Tiny85/ADC%20Tiny85.cpp
The NTC conversion/correction to °C from 10bit ADC output was generated with this page:
https://www.sebulli.com/ntc/index.php
The circuit and code should be self explanatory.
Alt text
Example screenshots of changing pulse width on NTC with different temperatures and the frequency of about 32kHz.
PWM1
PWM2
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Drive an 4 pin PWM Fan using an ATtiny45 or ATTiny85 which was harder than I thought
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arduinoattiny85avrfancontrolplatformiopwm
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