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<!DOCTYPE html>
< html lang = "en" >
< head >
< script > window . dataLayer = window . dataLayer || [ ] ; function gtag ( ) { dataLayer . push ( arguments ) } gtag ( "consent" , "default" , { ad _storage : "granted" , ad _user _data : "granted" , ad _personalization : "granted" , analytics _storage : "granted" } ) ; gtag ( "consent" , "default" , { ad _storage : "denied" , ad _user _data : "denied" , ad _personalization : "denied" , analytics _storage : "denied" , region : "AT,BE,BG,HR,CY,CZ,DK,EE,FI,FR,DE,GR,HU,IE,IT,LV,LT,LU,MT,NL,PL,PT,RO,SK,SI,ES,SE,IS,LI,NO,GB,CH,UA" . split ( "," ) } ) ; < / script >
<!-- Google tag (gtag.js) -->
< script async src = "https://www.googletagmanager.com/gtag/js?id=G-X1MKL6C4B0" > < / script >
< script > window . dataLayer = window . dataLayer || [ ] ; function gtag ( ) { dataLayer . push ( arguments ) } gtag ( "js" , new Date ( ) ) ; gtag ( "config" , "G-X1MKL6C4B0" ) ; < / script >
< meta charset = "UTF-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" >
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< link rel = "icon" href = "favicon.ico" >
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< title > Resistor Color Decoder< / title >
< script src = "tool-bridge.js" > < / script >
< script src = "spyglass.js" > < / script >
< link rel = "stylesheet" href = "tool-style.css" >
< style >
:root { --accent: #2563eb; --resistor-body: #82cae0; --resistor-shadow: #5ea8bd; }
.controls-grid { grid-template-columns: 1fr 1fr; }
< / style >
< / head >
< body >
< div class = "container" >
< h1 id = "app-title" > Resistor Color Decoder< / h1 >
< div class = "top-section" >
< div id = "spyglass-col" class = "col-spyglass" >
< div class = "spyglass-wrapper" >
< canvas id = "tool-canvas" class = "spyglass-canvas" width = "600" height = "600" > < / canvas >
< div id = "tool-zoom" class = "zoom-badge" > 2x< / div >
< / div >
< div id = "view-selector" > < / div >
< / div >
< div class = "col-controls" >
< div class = "reverse-input-group" >
< div class = "input-row" >
< input type = "text" id = "nominal-input" class = "inp-nominal" placeholder = "e.g. 4k7, 100" >
< button class = "btn-action" onclick = "applyNominal()" > Set< / button >
< / div >
< / div >
< div class = "controls-grid" >
< button class = "btn-mode" onclick = "setBands(3)" > 3 Band< / button >
< button class = "btn-mode" onclick = "setBands(4)" > 4 Band< / button >
< button class = "btn-mode" onclick = "setBands(5)" > 5 Band< / button >
< button class = "btn-mode active" onclick = "setBands(6)" > 6 Band< / button >
< / div >
< / div >
< / div >
< div class = "resistor-wrapper-outer" >
< div class = "resistor-dumbbell-shape" >
< div class = "bands-container" id = "picker-area" > < / div >
< / div >
< / div >
< div id = "results" class = "result-box" > < / div >
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< div class = "app-footer" > Copyright © 2025 Taras Greben — < a href = "https://pcb.etaras.com" > pcb.eTaras.com< / a > < / div >
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< / div >
< div id = "global-dropdown" > < / div >
< script >
const colors = [
{ name: 'Black', val: 0, mult: 1, tol: null, tcr: 250, css: 'c-bk' },
{ name: 'Brown', val: 1, mult: 10, tol: 1, tcr: 100, css: 'c-bn' },
{ name: 'Red', val: 2, mult: 100, tol: 2, tcr: 50, css: 'c-rd' },
{ name: 'Orange', val: 3, mult: 1000, tol: null, tcr: 15, css: 'c-og' },
{ name: 'Yellow', val: 4, mult: 10000, tol: null, tcr: 25, css: 'c-ye' },
{ name: 'Green', val: 5, mult: 100000, tol: 0.5, tcr: 20, css: 'c-gn' },
{ name: 'Blue', val: 6, mult: 1000000, tol: 0.25, tcr: 10, css: 'c-bu' },
{ name: 'Violet', val: 7, mult: 10000000, tol: 0.1, tcr: 5, css: 'c-vt' },
{ name: 'Gray', val: 8, mult: null, tol: 0.05, tcr: 1, css: 'c-gy' },
{ name: 'White', val: 9, mult: null, tol: null, tcr: null, css: 'c-wh' },
{ name: 'Gold', val: null, mult: 0.1, tol: 5, tcr: null, css: 'c-gd' },
{ name: 'Silver', val: null, mult: 0.01, tol: 10, tcr: null, css: 'c-sv' }
];
const e12=[1.0,1.2,1.5,1.8,2.2,2.7,3.3,3.9,4.7,5.6,6.8,8.2];
const e24=[1.0,1.1,1.2,1.3,1.5,1.6,1.8,2.0,2.2,2.4,2.7,3.0,3.3,3.6,3.9,4.3,4.7,5.1,5.6,6.2,6.8,7.5,8.2,9.1];
let currentBands=4; let bandState=[1,2,2,10,1,2]; let activeBandIndex=-1; let isEmbed=false; let bridge=null;
const globalDropdown = document.getElementById('global-dropdown');
function init() {
initGlobalDropdown();
const urlParams = new URLSearchParams(window.location.search);
if (urlParams.has('embed') || window.self !== window.top) {
isEmbed = true;
document.getElementById('app-title').style.display = 'none';
}
setBands(4);
}
function initGlobalDropdown(){
globalDropdown.innerHTML='';
colors.forEach((c,i)=>{
const o=document.createElement('div');
o.className=`custom-option ${c.css}`;
o.innerText=c.name;
o.onclick=e=>{e.stopPropagation(); if(activeBandIndex>-1){bandState[activeBandIndex]=i;renderPickers();calculate();closeDropdown();}};
globalDropdown.appendChild(o);
});
}
function openGlobalDropdown(triggerElement) {
globalDropdown.style.display = 'flex'; globalDropdown.style.top = '0px'; globalDropdown.style.left = '0px';
globalDropdown.classList.remove('condensed', 'super-condensed');
globalDropdown.style.height = 'auto'; globalDropdown.style.overflowY = 'hidden';
const triggerRect = triggerElement.getBoundingClientRect();
const menuRect = globalDropdown.getBoundingClientRect();
const viewportHeight = window.innerHeight;
let top = triggerRect.bottom + 5;
let left = triggerRect.left + (triggerRect.width / 2);
let projectedBottom = top + menuRect.height;
if (projectedBottom > viewportHeight - 10) {
globalDropdown.classList.add('condensed');
projectedBottom = top + globalDropdown.getBoundingClientRect().height;
}
if (projectedBottom > viewportHeight - 10) {
globalDropdown.classList.add('super-condensed');
projectedBottom = top + globalDropdown.getBoundingClientRect().height;
}
if (projectedBottom > viewportHeight - 10) {
const height = globalDropdown.getBoundingClientRect().height;
top = viewportHeight - height - 10;
if (top < 10 ) {
top = 10;
globalDropdown.style.height = (viewportHeight - 20) + 'px';
globalDropdown.style.overflowY = 'auto';
}
}
globalDropdown.style.top = top + 'px';
globalDropdown.style.left = left + 'px';
globalDropdown.style.transform = 'translateX(-50%)';
}
function closeDropdown(){ globalDropdown.style.display='none'; activeBandIndex=-1; }
window.addEventListener('click', closeDropdown);
window.addEventListener('resize', closeDropdown);
window.addEventListener('scroll', closeDropdown, true);
function setBands(n){ currentBands=n; document.querySelectorAll('.btn-mode').forEach((b,i)=>b.classList.toggle('active',(i+3)===n)); while(bandState.length< n ) bandState . push ( 0 ) ; renderPickers ( ) ; calculate ( ) ; }
function renderPickers(){
const a=document.getElementById('picker-area'); a.innerHTML='';
for(let i=0;i< currentBands ; i + + ) {
const w=document.createElement('div'); w.className='custom-select-wrapper';
const t=document.createElement('div'); t.className=`custom-select__trigger ${colors[bandState[i]].css}`;
t.innerHTML=`< span > ${colors[bandState[i]].name}< / span > `;
t.onclick=e=>{e.stopPropagation(); if(activeBandIndex===i&&globalDropdown.style.display==='flex')closeDropdown(); else{activeBandIndex=i;openGlobalDropdown(t);}};
w.appendChild(t); a.appendChild(w);
}
}
function parseInputStr(str) { if(!str)return null; let m=1; if(str.includes('M')){m=1e6;str=str.replace('M','.');}else if(str.includes('m')){m=1e-3;str=str.replace('m','.');}else if(str.toLowerCase().includes('k')){m=1e3;str=str.replace(/k/i,'.');}else if(str.toLowerCase().includes('r')){m=1;str=str.replace(/r/i,'.');} const v=parseFloat(str); return isNaN(v)?null:v*m; }
function applyNominal(){ const raw=document.getElementById('nominal-input').value; const ohms=parseInputStr(raw); if(ohms===null)return; const nD=(currentBands>=5)?3:2; let val=ohms; const mag=Math.floor(Math.log10(val)); const shift=(nD-1)-mag; let norm=Math.round(val*Math.pow(10,shift)); let s=norm.toString(); if(s.length>nD){norm=Math.round(norm/10);s=norm.toString();} const d=[]; for(let i=0;i< nD ; i + + ) d . push ( parseInt ( s [ i ] ) ) ; const exp = Math.round(Math.log10(ohms/norm)); let mIdx = -1; if ( exp > =0&&exp<=9)mIdx=exp; else if(exp===-1)mIdx=10;else if(exp===-2)mIdx=11; if(mIdx!==-1){ bandState[0]=d[0];bandState[1]=d[1]; if(nD===2){bandState[2]=mIdx;if(currentBands===4)bandState[3]=10;}else{bandState[2]=d[2];bandState[3]=mIdx;bandState[4]=1;if(currentBands===6)bandState[5]=1;} renderPickers(); calculate(); } }
function formatOhmsUI(v){ if(v>=1e6)return(v/1e6).toFixed(2)+' MΩ'; if(v>=1e3)return(v/1e3).toFixed(2)+' kΩ'; if(v< 1 ) return ( v * 1000 ) . toFixed ( 0 ) + ' mΩ ' ; return v . toFixed ( 2 ) + ' Ω ' ; }
function formatOhmsBOM(v){ if(v>=1e6)return(v/1e6).toFixed(2)+'M'; if(v>=1e3)return(v/1e3).toFixed(2)+'k'; if(v< 1 ) return ( v * 1000 ) . toFixed ( 0 ) + ' m ' ; return v . toFixed ( 2 ) + ' R ' ; }
function checkSeries(v){ let n=v; while(n>=10)n/=10; while(n< 1 & & n > 0)n*=10; n=Math.round(n*100)/100; if(e12.includes(n))return "E12"; if(e24.includes(n))return "E24"; return ""; }
function decode(idx){ if(colors[idx[0]].name==='Black'||colors[idx[0]].name==='Gold'||colors[idx[0]].name==='Silver')return{valid:false}; let v=0,m=0,t=0,tcr=0; if(currentBands===3){v=colors[idx[0]].val*10+colors[idx[1]].val;m=colors[idx[2]].mult;t=20;}else if(currentBands===4){v=colors[idx[0]].val*10+colors[idx[1]].val;m=colors[idx[2]].mult;t=colors[idx[3]].tol;}else{v=colors[idx[0]].val*100+colors[idx[1]].val*10+colors[idx[2]].val;m=colors[idx[3]].mult;t=colors[idx[4]].tol;if(currentBands===6)tcr=colors[idx[5]].tcr;} if(m===null||(currentBands>3&&t===null))return{valid:false}; const o=v*m; return{ohms:o,tol:t,tcr,valid:true,seriesInfo:checkSeries(o)}; }
function calculate(){
const f=decode(bandState.slice(0,currentBands)); const b=decode([...bandState.slice(0,currentBands)].reverse());
let fb=true; if(f.valid&&!b.valid)fb=true; else if(!f.valid&&b.valid)fb=false; else if(f.valid&&b.valid){fb=!(b.seriesInfo!==""&&f.seriesInfo===""); }
let h='';
const row=(d,isF,best)=>{
if(!d.valid&&!best)return'';
const cls=best?'result-row best-match':'result-row';
const arrowSvg = isF ? `< svg viewBox = "0 0 24 24" > < path d = "M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8z" > < / path > < / svg > ` : `< svg viewBox = "0 0 24 24" > < path d = "M20 11H7.83l5.59-5.59L12 4l-8 8 8 8 1.41-1.41L7.83 13H20v-2z" > < / path > < / svg > `;
const ic = isF ? "direction-icon" : "direction-icon reverse";
const btn = isEmbed ? `< button class = "btn-select" onclick = "selectResult('${formatOhmsBOM(d.ohms)}')" > Select< / button > ` : '';
const badge = best ? `< span class = "badge-success" style = "margin-left:0.5rem; padding:0.1rem 0.5rem; font-size:0.7rem; vertical-align:middle;" > Likely< / span > ` : '';
const ser=d.seriesInfo?` < span class = "match-badge" > ${d.seriesInfo}< / span > `:'';
return `< div class = "${cls}" >
< div class = "${ic}" > ${arrowSvg}< / div >
< div class = "val-group" >
< span class = "val-text" > ${formatOhmsUI(d.ohms)}${ser}< / span >
< span class = "meta-text" > ±${d.tol}%${d.tcr?` | ${d.tcr}ppm`:''}${badge}< / span >
< / div >
${btn}
< / div > `;
};
if(!f.valid& & !b.valid) h='< div style = "text-align:center;color:red;padding:1rem" > Invalid< / div > ';
else{
if(fb){h+=row(f,true,true);h+=row(b,false,false);}
else{h+=row(b,false,true);h+=row(f,true,false);}
}
document.getElementById('results').innerHTML=h;
}
function selectResult(vStr){
let d=`Resistor: ${currentBands}-Band, ±${colors[bandState[currentBands===3?null:(currentBands>=5?4:3)]]?.tol||20}%`;
if(bridge) bridge.sendResult(vStr, d);
}
function parseResistorMeta(d){
let r={bands:4,tolIdx:-1,tcrIdx:-1}; if(d.includes("3-Band"))r.bands=3;else if(d.includes("5-Band"))r.bands=5;else if(d.includes("6-Band"))r.bands=6;
const tm=d.match(/±\s*([\d.]+)%/); if(tm){const t=parseFloat(tm[1]);const c=colors.findIndex(x=>x.tol===t);if(c!==-1)r.tolIdx=c;}
const tc=d.match(/(\d+)\s*ppm/i); if(tc){const p=parseInt(tc[1]);const c=colors.findIndex(x=>x.tcr===p);if(c!==-1)r.tcrIdx=c;}
return r;
}
init();
bridge = new ToolBridge({
onData: (d) => {
if(d.value) document.getElementById('nominal-input').value = d.value;
let meta = {bands:4,tolIdx:-1,tcrIdx:-1};
if(d.description) meta = parseResistorMeta(d.description);
setBands(meta.bands);
applyNominal();
if(meta.tolIdx!==-1){ if(meta.bands===4)bandState[3]=meta.tolIdx; else if(meta.bands>=5)bandState[4]=meta.tolIdx; }
if(meta.tcrIdx!==-1 & & meta.bands===6) bandState[5]=meta.tcrIdx;
renderPickers(); calculate();
}
});
< / script >
< / body >
< / html >
