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klipper/zh-Hant/Load_Cell.html

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<!doctype html>
<html lang="zh-Hant" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="icon" href="img/favicon.ico">
<meta name="generator" content="mkdocs-1.2.4, mkdocs-material-8.1.3">
<title>Load Cells - Klipper 文檔</title>
<link rel="stylesheet" href="assets/stylesheets/main.edf004c2.min.css">
<link rel="stylesheet" href="assets/stylesheets/palette.e6a45f82.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700%7CRoboto+Mono&display=fallback">
<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
<link rel="stylesheet" href="_klipper3d/css/extra.css">
<script>__md_scope=new URL(".",location),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
<script>function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag("js",new Date),gtag("config","G-VEN1PGNQL4"),document.addEventListener("DOMContentLoaded",function(){document.forms.search&&document.forms.search.query.addEventListener("blur",function(){this.value&&gtag("event","search",{search_term:this.value})}),"undefined"!=typeof location$&&location$.subscribe(function(e){gtag("config","G-VEN1PGNQL4",{page_path:e.pathname})})})</script>
<script async src="https://www.googletagmanager.com/gtag/js?id=G-VEN1PGNQL4"></script>
</head>
<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="white" data-md-color-accent="blue">
<script>var palette=__md_get("__palette");if(palette&&"object"==typeof palette.color)for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)</script>
<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
<a href="#load-cells" class="md-skip">
跳轉至
</a>
</div>
<div data-md-component="announce">
</div>
<header class="md-header" data-md-component="header">
<nav class="md-header__inner md-grid" aria-label="Header">
<a href="." title="Klipper 文檔" class="md-header__button md-logo" aria-label="Klipper 文檔" data-md-component="logo">
<img src="img/klipper.svg" alt="logo">
</a>
<label class="md-header__button md-icon" for="__drawer">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2z"/></svg>
</label>
<div class="md-header__title" data-md-component="header-title">
<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
Klipper 文檔
</span>
</div>
<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
Load Cells
</span>
</div>
</div>
</div>
<form class="md-header__option" data-md-component="palette">
<input class="md-option" data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme="default" data-md-color-primary="white" data-md-color-accent="blue" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_1">
<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_2" hidden>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7M9 21a1 1 0 0 0 1 1h4a1 1 0 0 0 1-1v-1H9v1z"/></svg>
</label>
<input class="md-option" data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme="slate" data-md-color-primary="grey" data-md-color-accent="light-blue" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_2">
<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_1" hidden>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 1 7 7c0 2.38-1.19 4.47-3 5.74V17a1 1 0 0 1-1 1H9a1 1 0 0 1-1-1v-2.26C6.19 13.47 5 11.38 5 9a7 7 0 0 1 7-7M9 21v-1h6v1a1 1 0 0 1-1 1h-4a1 1 0 0 1-1-1m3-17a5 5 0 0 0-5 5c0 2.05 1.23 3.81 3 4.58V16h4v-2.42c1.77-.77 3-2.53 3-4.58a5 5 0 0 0-5-5z"/></svg>
</label>
</form>
<div class="md-header__option">
<div class="md-select">
<button class="md-header__button md-icon" aria-label="Select language">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M16.36 14c.08-.66.14-1.32.14-2 0-.68-.06-1.34-.14-2h3.38c.16.64.26 1.31.26 2s-.1 1.36-.26 2m-5.15 5.56c.6-1.11 1.06-2.31 1.38-3.56h2.95a8.03 8.03 0 0 1-4.33 3.56M14.34 14H9.66c-.1-.66-.16-1.32-.16-2 0-.68.06-1.35.16-2h4.68c.09.65.16 1.32.16 2 0 .68-.07 1.34-.16 2M12 19.96c-.83-1.2-1.5-2.53-1.91-3.96h3.82c-.41 1.43-1.08 2.76-1.91 3.96M8 8H5.08A7.923 7.923 0 0 1 9.4 4.44C8.8 5.55 8.35 6.75 8 8m-2.92 8H8c.35 1.25.8 2.45 1.4 3.56A8.008 8.008 0 0 1 5.08 16m-.82-2C4.1 13.36 4 12.69 4 12s.1-1.36.26-2h3.38c-.08.66-.14 1.32-.14 2 0 .68.06 1.34.14 2M12 4.03c.83 1.2 1.5 2.54 1.91 3.97h-3.82c.41-1.43 1.08-2.77 1.91-3.97M18.92 8h-2.95a15.65 15.65 0 0 0-1.38-3.56c1.84.63 3.37 1.9 4.33 3.56M12 2C6.47 2 2 6.5 2 12a10 10 0 0 0 10 10 10 10 0 0 0 10-10A10 10 0 0 0 12 2z"/></svg>
</button>
<div class="md-select__inner">
<ul class="md-select__list">
<li class="md-select__item">
<a href="/" hreflang="en" class="md-select__link">
English
</a>
</li>
<li class="md-select__item">
<a href="/zh/" hreflang="zh" class="md-select__link">
简体中文
</a>
</li>
<li class="md-select__item">
<a href="/zh-Hant/" hreflang="zh-Hant" class="md-select__link">
繁體中文
</a>
</li>
<li class="md-select__item">
<a href="/hu/" hreflang="hu" class="md-select__link">
Magyar
</a>
</li>
<li class="md-select__item">
<a href="/it/" hreflang="it" class="md-select__link">
Italiano
</a>
</li>
<li class="md-select__item">
<a href="/fr/" hreflang="fr" class="md-select__link">
Français
</a>
</li>
</ul>
</div>
</div>
</div>
<label class="md-header__button md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg>
</label>
<div class="md-search" data-md-component="search" role="dialog">
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="搜尋" placeholder="搜尋" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
<label class="md-search__icon md-icon" for="__search">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5z"/></svg>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
</label>
<nav class="md-search__options" aria-label="Search">
<a href="javascript:void(0)" class="md-search__icon md-icon" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7 0-.24-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3c.79 0 1.5-.31 2.04-.81l7.12 4.15c-.05.21-.08.43-.08.66 0 1.61 1.31 2.91 2.92 2.91 1.61 0 2.92-1.3 2.92-2.91A2.92 2.92 0 0 0 18 16.08z"/></svg>
</a>
<button type="reset" class="md-search__icon md-icon" aria-label="Clear" tabindex="-1">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41z"/></svg>
</button>
</nav>
<div class="md-search__suggest" data-md-component="search-suggest"></div>
</form>
<div class="md-search__output">
<div class="md-search__scrollwrap" data-md-scrollfix>
<div class="md-search-result" data-md-component="search-result">
<div class="md-search-result__meta">
正在初始化搜尋引擎
</div>
<ol class="md-search-result__list"></ol>
</div>
</div>
</div>
</div>
</div>
<div class="md-header__source">
<a href="https://github.com/Klipper3d/klipper/" title="前往倉庫" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
</div>
<div class="md-source__repository">
Klipper3d/klipper
</div>
</a>
</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
<label class="md-nav__title" for="__drawer">
<a href="." title="Klipper 文檔" class="md-nav__button md-logo" aria-label="Klipper 文檔" data-md-component="logo">
<img src="img/klipper.svg" alt="logo">
</a>
Klipper 文檔
</label>
<div class="md-nav__source">
<a href="https://github.com/Klipper3d/klipper/" title="前往倉庫" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
</div>
<div class="md-source__repository">
Klipper3d/klipper
</div>
</a>
</div>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="Overview.html" class="md-nav__link">
概述
</a>
</li>
<li class="md-nav__item">
<a href="Features.html" class="md-nav__link">
功能
</a>
</li>
<li class="md-nav__item">
<a href="FAQ.html" class="md-nav__link">
常見問題
</a>
</li>
<li class="md-nav__item">
<a href="Releases.html" class="md-nav__link">
版本發佈
</a>
</li>
<li class="md-nav__item">
<a href="Config_Changes.html" class="md-nav__link">
配置變更
</a>
</li>
<li class="md-nav__item">
<a href="Contact.html" class="md-nav__link">
聯繫方式
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" >
<label class="md-nav__link" for="__nav_7">
安裝和配置
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" aria-label="安裝和配置" data-md-level="1">
<label class="md-nav__title" for="__nav_7">
<span class="md-nav__icon md-icon"></span>
安裝和配置
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7_1" type="checkbox" id="__nav_7_1" >
<label class="md-nav__link" for="__nav_7_1">
Installation
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" aria-label="Installation" data-md-level="2">
<label class="md-nav__title" for="__nav_7_1">
<span class="md-nav__icon md-icon"></span>
Installation
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="Installation.html" class="md-nav__link">
安裝
</a>
</li>
<li class="md-nav__item">
<a href="OctoPrint.html" class="md-nav__link">
OctoPrint for Klipper
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7_2" type="checkbox" id="__nav_7_2" >
<label class="md-nav__link" for="__nav_7_2">
配置參考
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" aria-label="配置參考" data-md-level="2">
<label class="md-nav__title" for="__nav_7_2">
<span class="md-nav__icon md-icon"></span>
配置參考
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="Config_Reference.html" class="md-nav__link">
配置參考
</a>
</li>
<li class="md-nav__item">
<a href="Rotation_Distance.html" class="md-nav__link">
旋轉距離
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="Config_checks.html" class="md-nav__link">
配置檢查
</a>
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<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7_4" type="checkbox" id="__nav_7_4" >
<label class="md-nav__link" for="__nav_7_4">
印床水平
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" aria-label="印床水平" data-md-level="2">
<label class="md-nav__title" for="__nav_7_4">
<span class="md-nav__icon md-icon"></span>
印床水平
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="Bed_Level.html" class="md-nav__link">
列印床調平
</a>
</li>
<li class="md-nav__item">
<a href="Delta_Calibrate.html" class="md-nav__link">
三角校正
</a>
</li>
<li class="md-nav__item">
<a href="Probe_Calibrate.html" class="md-nav__link">
探針校準
</a>
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<h1 id="load-cells">Load Cells<a class="headerlink" href="#load-cells" title="Permanent link">&para;</a></h1>
<p>This document describes Klipper's support for load cells. Basic load cell functionality can be used to read force data and to weigh things like filament. A calibrated force sensor is an important part of a load cell based probe.</p>
<h2 id="related-documentation">Related Documentation<a class="headerlink" href="#related-documentation" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="Config_Reference.html#load_cell">load_cell Config Reference</a></li>
<li><a href="G-Codes.html#load_cell">load_cell G-Code Commands</a></li>
<li><a href="Status_Reference.html#load_cell">load_cell Status Reference</a></li>
</ul>
<h2 id="using-load_cell_diagnostic">Using <code>LOAD_CELL_DIAGNOSTIC</code><a class="headerlink" href="#using-load_cell_diagnostic" title="Permanent link">&para;</a></h2>
<p>When you first connect a load cell its good practice to check for issues by running <code>LOAD_CELL_DIAGNOSTIC</code>. This tool collects 10 seconds of data from the load cell and resport statistics:</p>
<div class="highlight"><pre><span></span><code>$ LOAD_CELL_DIAGNOSTIC
// Collecting load cell data for 10 seconds...
// Samples Collected: 3211
// Measured samples per second: 332.0
// Good samples: 3211, Saturated samples: 0, Unique values: 900
// Sample range: [4.01% to 4.02%]
// Sample range / sensor capacity: 0.00524%
</code></pre></div>
<p>Things you can check with this data:</p>
<ul>
<li>The configured sample rate of the sensor should be close to the 'Measured samples per second' value. If it is not you may have a configuration or wiring issue.</li>
<li>'Saturated samples' should be 0. If you have saturated samples it means the load sell is seeing more force than it can measure.</li>
<li>'Unique values' should be a large percentage of the 'Samples Collected' value. If 'Unique values' is 1 it is very likely a wiring issue.</li>
<li>Tap or push on the sensor while <code>LOAD_CELL_DIAGNOSTIC</code> runs. If things are working correctly ths should increase the 'Sample range'.</li>
</ul>
<h2 id="calibrating-a-load-cell">Calibrating a Load Cell<a class="headerlink" href="#calibrating-a-load-cell" title="Permanent link">&para;</a></h2>
<p>Load cells are calibrated using the <code>LOAD_CELL_CALIBRATE</code> command. This is an interactive calibration utility that walks you though a 3 step process:</p>
<ol>
<li>First use the <code>TARE</code> command to establish the zero force value. This is the <code>reference_tare_counts</code> config value.</li>
<li>Next you apply a known load or force to the load cell and run the <code>CALIBRATE GRAMS=nnn</code> command. From this the <code>counts_per_gram</code> value is calculated. See <a href="#applying-a-known-force-or-load">the next section</a> for some suggestions on how to do this.</li>
<li>Finally, use the <code>ACCEPT</code> command to save the results.</li>
</ol>
<p>You can cancel the calibration process at any time with <code>ABORT</code>.</p>
<h3 id="applying-a-known-force-or-load">Applying a Known Force or Load<a class="headerlink" href="#applying-a-known-force-or-load" title="Permanent link">&para;</a></h3>
<p>The <code>CALIBRATE GRAMS=nnn</code> step can be accomplished in a number of ways. If your load cell is under a platform like a bed or filament holder it might be easiest to put a known mass on the platform. E.g. you could use a couple of 1KG filament spools.</p>
<p>If your load cell is in the printer's toolhead a different approach is easier. Put a digital scale on the printers bed and gently lower the toolhead onto the scale (or raise the bed into the toolhead if your bed moves). You may be able to do this using the <code>FORCE_MOVE</code> command. But more likely you will have to manually moving the z axis with the motors off until the toolhead presses on the scale.</p>
<p>A good calibration force would ideally be a large percentage of the load cell's rated capacity. E.g. if you have a 5Kg load cell you would ideally calibrate it with a 5kg mass. This might work well with under-bed sensors that have to support a lot of weight. For toolhead probes this may not be a load that your printer bed or toolhead can tolerate without damage. Do try to use at least 1Kg of force, most printers should tolerate this without issue.</p>
<p>When calibrating make careful note of the values reported:</p>
<div class="highlight"><pre><span></span><code>$ CALIBRATE GRAMS=555
// Calibration value: -2.78% (-59803108), Counts/gram: 73039.78739,
Total capacity: +/- 29.14Kg
</code></pre></div>
<p>The <code>Total capacity</code> should be close to the theoretical rating of the load cell based on the sensor's capacity. If it is much larger you could have used a higher gain setting in the sensor or a more sensitive load cell. This isn't as critical for 32bit and 24bit sensors but is much more critical for low bit width sensors.</p>
<h2 id="reading-force-data">Reading Force Data<a class="headerlink" href="#reading-force-data" title="Permanent link">&para;</a></h2>
<p>Force data can be read with a GCode command:</p>
<div class="highlight"><pre><span></span><code>LOAD_CELL_READ
// 10.6g (1.94%)
</code></pre></div>
<p>Data is also continuously read and can be consumed from the load_cell printer object in a macro:</p>
<div class="highlight"><pre><span></span><code>{% set grams = printer.load_cell.force_g %}
</code></pre></div>
<p>This provides an average force over the last 1 second, similar to how temperature sensors work.</p>
<h2 id="taring-a-load-cell">Taring a Load Cell<a class="headerlink" href="#taring-a-load-cell" title="Permanent link">&para;</a></h2>
<p>Taring, sometimes called zeroing, sets the current weight reported by the load_cell to 0. This is useful for measuring relative to a known weight. e.g. when measuring a filament spool, using <code>LOAD_CELL_TARE</code> sets the weight to 0. Then as filament is printed the load_cell will report the weight of the filament used.</p>
<div class="highlight"><pre><span></span><code>LOAD_CELL_TARE
// Load cell tare value: 5.32% (445903)
</code></pre></div>
<p>The current tare value is reported in the printers status and can be read in a macro:</p>
<div class="highlight"><pre><span></span><code>{% set tare_counts = printer.load_cell.tare_counts %}
</code></pre></div>
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