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Resistor Calculator.html
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<!DOCTYPE html>
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="-1" />
<head>
<p>
<strong>Note:</strong> Resistor Calculator is not supported in Internet Explorer 8 and earlier versions.
</p>
</head>
<body onload="init()">
<canvas id="Resistor Canvas" width="600" height="140" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.
</canvas>
<script>
var img = new Image();
var img_x_start = 15;
var img_y_start = 15;
var img_orig_width = 569;
var img_orig_height = 106;
var resistor_URL;
function init() {
Resistor_Calculator();
calculate_resistor_value();
}
function Resistor_Calculator() {
var context = document.getElementById('Resistor Canvas').getContext("2d");
img.src = "resistor base.png";
img.onload = function () {
context.drawImage(img, img_x_start, img_y_start);
create_band(1, getColor(document.getElementById("band1")));
create_band(2, getColor(document.getElementById("band2")));
create_band(4, getColor(document.getElementById("multiplier")));
create_band("tolerance", getColor(document.getElementById("tolerance")));
}
}
function getColor(object) {
return remove_whitespace(object.textContent.split("\n")[parseInt(object.value) + 1]);
}
function remove_whitespace(string) {
var i = 0;
for (i = 0; i < string.length; i++) {
if (string[i] != ' ')
break;
}
return string.substring(i, string.length);
}
function add_band(object) {
if (parseInt(object.value) == 4) {
document.getElementById("band3_label").setAttribute("style", "visibility: hidden");
document.getElementById("band3").setAttribute("style", "visibility: hidden");
remove_band(3);
} else {
document.getElementById("band3_label").setAttribute("style", "visibility: visible");
document.getElementById("band3").setAttribute("style", "visibility: visible");
create_band(3, getColor(document.getElementById("band3")));
}
calculate_resistor_value();
}
function create_band(band_number, color) {
drawBand(band_number, color);
}
function remove_band(band_number) {
drawBand(band_number, "remove");
}
function redraw(object) {
change_band_color(object);
calculate_resistor_value();
}
function change_band_color(object) {
switch (object.id) {
case "band1":
drawBand(1, getColor(object));
break;
case "band2":
drawBand(2, getColor(object));
break;
case "band3":
drawBand(3, getColor(object));
break;
case "multiplier":
drawBand(4, getColor(object));
break;
case "tolerance":
drawBand("tolerance", getColor(object));
break;
}
}
function calculate_resistor_value() {
var resistor_value;
var first_digit = parseInt(document.getElementById("band1").value) + 1;
var second_digit = parseInt(document.getElementById("band2").value);
var third_digit = parseInt(document.getElementById("band3").value);
var multiplier = parseInt(document.getElementById("multiplier").value);
var tolerance = parseInt(document.getElementById("tolerance").value);
var power = document.getElementById("power").value;
resistor_URL = "http://127.0.0.1/"
if (parseInt(document.getElementById("number_of_bands").value) == 4) {
switch (multiplier) {
case 0:
if (second_digit > 0) {
resistor_value = "." + first_digit.toString() + second_digit.toString();
} else {
resistor_value = first_digit.toString();
}
break;
case 1:
if (second_digit > 0) {
resistor_value = first_digit.toString() + "." + second_digit.toString();
} else {
resistor_value = first_digit.toString();
}
break;
case 2:
resistor_value = first_digit.toString() + second_digit.toString();
break;
case 3:
resistor_value = first_digit.toString() + second_digit.toString() + "0";
break;
case 4:
if (second_digit > 0) {
resistor_value = first_digit.toString() + "." + second_digit.toString() + "k";
} else {
resistor_value = first_digit.toString() + "k";
}
break;
case 5:
resistor_value = first_digit.toString() + second_digit.toString() + "k";
break;
case 6:
resistor_value = first_digit.toString() + second_digit.toString() + "0k";
break;
case 7:
if (second_digit > 0) {
resistor_value = first_digit.toString() + "." + second_digit.toString() + "M";
} else {
resistor_value = first_digit.toString() + "M";
}
break;
case 8:
resistor_value = first_digit.toString() + second_digit.toString() + "M";
break;
case 9:
resistor_value = first_digit.toString() + second_digit.toString() + "0M";
break;
case 10:
resistor_value = first_digit.toString() + "." + second_digit.toString() + "G";
break;
case 11:
resistor_value = first_digit.toString() + second_digit.toString() + "G";
break;
default:
resistor_value = "undefined";
break;
}
} else {
switch (multiplier) {
case 0:
resistor_value = first_digit.toString() + "." + second_digit.toString() + third_digit.toString();
break;
case 1:
resistor_value = first_digit.toString() + second_digit.toString() + "." + third_digit.toString();
break;
case 2:
resistor_value = first_digit.toString() + second_digit.toString() + third_digit.toString();
break;
case 3:
resistor_value = first_digit.toString() + "." + second_digit.toString() + third_digit.toString() +
"k";
break;
case 4:
resistor_value = first_digit.toString() + second_digit.toString() + "." + third_digit.toString() +
"k";
break;
case 5:
resistor_value = first_digit.toString() + second_digit.toString() + +third_digit.toString() +
"k";
break;
case 6:
resistor_value = first_digit.toString() + "." + second_digit.toString() + third_digit.toString() +
"M";
break;
case 7:
resistor_value = first_digit.toString() + second_digit.toString() + "." + third_digit.toString() +
"M";
break;
case 8:
resistor_value = first_digit.toString() + second_digit.toString() + third_digit.toString() +
"M";
break;
case 9:
resistor_value = first_digit.toString() + "." + second_digit.toString() + third_digit.toString() +
"G";
break;
case 10:
resistor_value = first_digit.toString() + second_digit.toString() + "." + third_digit.toString() +
"G";
break;
case 11:
resistor_value = first_digit.toString() + second_digit.toString() + third_digit.toString() +
"G";
break;
default:
resistor_value = "undefined";
break;
}
}
check_if_valid_resistor(resistor_value, tolerance, power);
switch (power) {
case "1/8 watt":
resistor_URL += "rd" + resistor_value + ".html";
break;
case "1/4 watt":
if (tolerance == 6) {
resistor_URL += "ra" + resistor_value + ".html";
} else {
resistor_URL += "rc" + resistor_value + ".html";
}
break;
case "1/2 watt":
resistor_URL += "rb" + resistor_value + ".html";
break;
case "1 watt":
resistor_URL += "rg" + resistor_value + ".html";
break;
default:
break;
}
resistor_value += " Ohms ";
switch (tolerance) {
case 0:
resistor_value += ".05%";
break;
case 1:
resistor_value += ".1%";
break;
case 2:
resistor_value += ".25%";
break;
case 3:
resistor_value += ".5%";
break;
case 4:
resistor_value += "1%";
break;
case 5:
resistor_value += "2%";
break;
case 6:
resistor_value += "5%";
break;
case 7:
resistor_value += "10%";
break;
default:
break;
}
resistor_value += " " + power;
document.getElementById("resistor_value").innerHTML = resistor_value;
}
function check_if_valid_resistor(rv, tolerance, power) {
var standard_values = ["1", "1.1", "1.2", "1.3", "1.5", "1.6", "1.8", "2", "2.2", "2.4", "2.7", "3", "3.3", "3.6", "3.9", "4.3", "4.7", "5.1", "5.6", "6.2", "6.8", "7.5", "8.2", "9.1",
"10", "11", "12", "13", "15", "16", "18", "20", "22", "24", "27", "30", "33", "36", "39", "43", "47", "51", "56", "62", "68", "75", "82", "91",
"100", "110", "120", "130", "150", "160", "180", "200", "220", "240", "270", "300", "330", "360", "390", "430", "470", "510", "560", "620", "680", "750", "820", "910",
"1k", "1.1k", "1.2k", "1.3k", "1.5k", "1.6k", "1.8k", "2k", "2.2k", "2.4k", "2.7k", "3k", "3.3k", "3.6k", "3.9k", "4.3k", "4.7k", "5.1k", "5.6k", "6.2k", "6.8k", "7.5k", "8.2k", "9.1k",
"10k", "11k", "12k", "13k", "15k", "16k", "18k", "20k", "22k", "24k", "27k", "30k", "33k", "36k", "39k", "43k", "47k", "51k", "56k", "62k", "68k", "75k", "82k", "91k",
"100k", "110k", "120k", "130k", "150k", "160k", "180k", "200k", "220k", "240k", "270k", "300k", "330k", "360k", "390k", "430k", "470k", "510k", "560k", "620k", "680k", "750k", "820k", "910k",
"1M", "1.1M", "1.2M", "1.3M", "1.5M", "1.6M", "1.8M", "2M", "2.2M", "2.4M", "2.7M", "3M", "3.3M", "3.6M", "3.9M", "4.3M", "4.7M", "5.1M", "5.6M", "6.2M", "6.8M", "7.5M", "8.2M", "9.1M"];
var found = false;
var lower_val;
var upper_val;
for (i = 0; i < standard_values.length; i++) {
if (rv == standard_values[i]) {
found = true;
break;
}
}
if (!found) { // + "\nTwo nearest values are: " + standard_values[lower_val] + " & " + standard_values[upper_val]);
alert("Warning: Resistor Value may not exist");
}
}
function drawBand(band_num, color) {
var c = document.getElementById("Resistor Canvas");
var ctx = c.getContext("2d");
switch (color) {
case "Black":
ctx.fillStyle = "#000000";
break;
case "Brown":
ctx.fillStyle = "#8b4513";
break;
case "Red":
ctx.fillStyle = "#ff0000";
break;
case "Orange":
ctx.fillStyle = "#ffa500";
break;
case "Yellow":
ctx.fillStyle = "#ffff00";
break;
case "Green":
ctx.fillStyle = "#00ff00";
break;
case "Blue":
ctx.fillStyle = "#0000ff";
break;
case "Violet":
ctx.fillStyle = "#8a2be2";
break;
case "Grey":
ctx.fillStyle = "#d3d3d3";
break;
case "White":
ctx.fillStyle = "#ffffff";
break;
case "Gold":
ctx.fillStyle = "#ffd700";
break;
case "Silver":
ctx.fillStyle = "#c0c0c0";
break;
default:
ctx.fillStyle = "#edc054";
break;
}
var band_x_start = 0;
var band_y_start = band_y_start = 10 * img.height / img_orig_height + img_y_start;;
var band_width = band_width = 15 * img.width / img_orig_width;
var band_height = band_height = 83 * img.height / img_orig_height;;
switch (band_num) {
case 1:
band_x_start = 104 * img.width / img_orig_width + img_x_start;
band_y_start = 1 * img.height / img_orig_height + img_y_start;
band_height = 104 * img.height / img_orig_height;
break;
case "tolerance":
band_x_start = 454 * img.width / img_orig_width + img_x_start;
band_y_start = 1 * img.height / img_orig_height + img_y_start;
band_height = 104 * img.height / img_orig_height;
break;
default:
band_x_start = (104 + ((band_num - 1) * 60)) * img.height / img_orig_height + img_x_start;
break;
}
ctx.fillRect(band_x_start, band_y_start, band_width, band_height);
}
function goto_site() {
location.href = resistor_URL;
}
function show_table() {
document.getElementById("dimension_table").setAttribute("style", "visibility: visible");
}
</script>
<br>
<label>Number of Bands</label>
<select id="number_of_bands" onchange="add_band(this)">
<option value="4" selected>4</option>
<option value="5">5</option>
</select>
<br>
<label>Band #1</label>
<select id="band1" onchange="redraw(this)">
<option value="0" selected>Brown</option>
<option value="1">Red</option>
<option value="2">Orange</option>
<option value="3">Yellow</option>
<option value="4">Green</option>
<option value="5">Blue</option>
<option value="6">Violet</option>
<option value="7">Grey</option>
<option value="8">White</option>
</select>
<label>Band #2</label>
<select id="band2" onchange="redraw(this)">
<option value="0" selected>Black</option>
<option value="1">Brown</option>
<option value="2">Red</option>
<option value="3">Orange</option>
<option value="4">Yellow</option>
<option value="5">Green</option>
<option value="6">Blue</option>
<option value="7">Violet</option>
<option value="8">Grey</option>
<option value="9">White</option>
</select>
<label id="band3_label" style="visibility: hidden">Band #3</label>
<select id="band3" style="visibility: hidden" onchange="redraw(this)">
<option value="0" selected>Black</option>
<option value="1">Brown</option>
<option value="2">Red</option>
<option value="3">Orange</option>
<option value="4">Yellow</option>
<option value="5">Green</option>
<option value="6">Blue</option>
<option value="7">Violet</option>
<option value="8">Grey</option>
<option value="9">White</option>
</select>
<br>
<label>Multiplier</label>
<select id="multiplier" onchange="redraw(this)">
<option value="0">Silver</option>
<option value="1">Gold</option>
<option value="2" selected>Black</option>
<option value="3">Brown</option>
<option value="4">Red</option>
<option value="5">Orange</option>
<option value="6">Yellow</option>
<option value="7">Green</option>
<option value="8">Blue</option>
<option value="9">Violet</option>
<option value="10">Grey</option>
<option value="11">White</option>
</select>
<label>Tolerance</label>
<select id="tolerance" onchange="redraw(this)">
<option value="0">Grey</option>
<option value="1">Violet</option>
<option value="2">Blue</option>
<option value="3">Green</option>
<option value="4">Brown</option>
<option value="5">Red</option>
<option value="6" selected>Gold</option>
<option value="7">Silver</option>
</select>
<label>Power</label>
<select id="power" onchange="calculate_resistor_value()">
<option value="1/8 watt" selected>1/8 watt</option>
<option value="1/4 watt">1/4 watt</option>
<option value="1/2 watt">1/2 watt</option>
<option value="1 watt">1 watt</option>
</select>
<br>
<label>Resistor Value: </label>
<label id="resistor_value">0</label>
<br>
<button id="buy_button" onclick="goto_site()">Check Availability</button>
<br>
<br>
<button id="power_table" onclick="show_table()">Display Resistor Size Power Table</button>
<table id="dimension_table" style="visibility: hidden">
<tr>
<th>Power Rating</th>
<th>Body Length</th>
<th>Body Diameter</th>
</tr>
<tr>
<th>Wattage</th>
<th>size in mm</th>
<th>size in mm</th>
</tr>
<tr>
<td>1/8</td>
<td>3.0</td>
<td>1.8</td>
</tr>
<tr>
<td>1/4</td>
<td>6.5</td>
<td>2.5</td>
</tr>
<tr>
<td>1/2</td>
<td>8.5</td>
<td>3.2</td>
</tr>
<tr>
<td>1</td>
<td>11</td>
<td>5</td>
</tr>
</table>
</body>