Online Resistor Calculator Cloud App Free Software

Abhishek Ghosh

By Abhishek Ghosh July 20, 2015 8:02 pm Updated on July 20, 2015

Online Resistor Calculator Cloud App Free Software

Here is an Online Resistor Calculator Cloud App Free Software to Calculate Resistance of the 4 Band Color Coded Registers. It Can Run on OpenStack Based CDN, OpenShift PaaS, Anywhere and on localhost. We found the Javascript on a website with no proper licensing.

This app is required to calculate the resistance of the registers used in electronics work without a multimeter. It is tough work to calculate using the reference table :

Color	Digit value	Multiplier	Multiplied Out	Tolerance
Black	0	10⁰	1
Brown	1	10¹	10
Red	2	10²	100
Orange	3	10³	1,000
Yellow	4	10⁴	10000
Green	5	10⁵	100,000
Blue	6	10⁶	1,000,000
Violet	7	10⁷	10,000,000
Gray	8	10⁸	100,000,000
White	9	10⁹	1,000,000,000
Gold				±5%
Silver				±10%

We only released it for educational purpose. You can download and use it with GNU GPL 3.0 License.

Online Resistor Calculator Cloud App Free Software

You can see the demo of Online Resistor Calculator running on HP Cloud CDN. Obviously we have a GitHub Repo of this web application. Usage is very easy :

Explaining the Online Resistor Calculator Cloud App

The main Javascript is this :

<script language="JavaScript">
function calcResistance(input) {
    msv = document.colorSelect.band1.value;
    lsv = document.colorSelect.band2.value;
    mult = document.colorSelect.band3.value;
    tol = document.colorSelect.band4.value;
    var bgColors = new Array("black", "#583030", "red", "orange", "yellow", "green", "blue", "purple", "gray", "white", "gold", "silver");
    var fgColors = new Array("white", "white", "white", "black", "black", "white", "white", "white", "black", "black", "black", "black");
    resistText = msv + lsv;
    for (var i=0; i<mult; i++) {
        resistText += "0";
    }
    resistText = addCommas(resistText); // Insert commas
    resistText += " \u2126 \u00B1"; // Add ohm, space, plus/minus sign
    if (tol == "10")
        resistText += "5%";
    else if (tol == "11")
        resistText += "10%";
    
    document.colorSelect.band1.style.background = bgColors[parseInt(msv)];
    document.colorSelect.band1.style.color = fgColors[parseInt(msv)];
    document.colorSelect.band2.style.background = bgColors[parseInt(lsv)];
    document.colorSelect.band2.style.color = fgColors[parseInt(lsv)];
    document.colorSelect.band3.style.background = bgColors[parseInt(mult)];
    document.colorSelect.band3.style.color = fgColors[parseInt(mult)];
    document.colorSelect.band4.style.background = bgColors[parseInt(tol)];
    document.colorSelect.band4.style.color = fgColors[parseInt(tol)];
    document.getElementById("resistorValue").innerHTML=resistText;
}

function addCommas(x) {
    return x.replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
</script>

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function calcResistance(input) {

msv = document.colorSelect.band1.value;

lsv = document.colorSelect.band2.value;

mult = document.colorSelect.band3.value;

tol = document.colorSelect.band4.value;

var bgColors = new Array("black", "#583030", "red", "orange", "yellow", "green", "blue", "purple", "gray", "white", "gold", "silver");

var fgColors = new Array("white", "white", "white", "black", "black", "white", "white", "white", "black", "black", "black", "black");

resistText = msv + lsv;

for (var i=0; i<mult; i++) {

resistText += "0";

}

resistText = addCommas(resistText); // Insert commas

resistText += " \u2126 \u00B1"; // Add ohm, space, plus/minus sign

if (tol == "10")

resistText += "5%";

else if (tol == "11")

resistText += "10%";

document.colorSelect.band1.style.background = bgColors[parseInt(msv)];

document.colorSelect.band1.style.color = fgColors[parseInt(msv)];

document.colorSelect.band2.style.background = bgColors[parseInt(lsv)];

document.colorSelect.band2.style.color = fgColors[parseInt(lsv)];

document.colorSelect.band3.style.background = bgColors[parseInt(mult)];

document.colorSelect.band3.style.color = fgColors[parseInt(mult)];

document.colorSelect.band4.style.background = bgColors[parseInt(tol)];

document.colorSelect.band4.style.color = fgColors[parseInt(tol)];

document.getElementById("resistorValue").innerHTML=resistText;

}

function addCommas(x) {

return x.replace(/\B(?=(\d{3})+(?!\d))/g, ",");

}

</script>

This must be rendered with this HTML code :

<table>
<tr align="center"><td>Band 1</td><td>Band 2</td><td>Band 3</td><td></td><td>Band 4</td></tr>
<tr align="center"><td>Value 1 (MSV)</td><td>Value 2</td><td>Weight</td><td></td><td>Tolerance</td></tr>
<tr>
<form name="colorSelect" method="" action="">
<td><select name="band1" value="1" onChange="calcResistance(this)" style="width: 150px; color: white; background: #583030;">
<option value="0" style="color: white; background: black;">Black (0)</option>
<option value="1" style="color: white; background: #583030;" selected>Brown (1)</option>
<option value="2" style="color: white; background: red;">Red (2)</option>
<option value="3" style="color: black; background: orange;">Orange (3)</option>
<option value="4" style="color: black; background: yellow;">Yellow (4)</option>
<option value="5" style="color: white; background: green;">Green (5)</option>
<option value="6" style="color: white; background: blue;">Blue (6)</option>
<option value="7" style="color: white; background: purple;">Violet (7)</option>
<option value="8" style="color: white; background: gray;">Gray (8)</option>
<option value="9" style="color: black; background: white;">White (9)</option>
</select></td>
<td><select name="band2" value="0" onChange="calcResistance(this)" style="width: 150px; color: white; background: black;">
<option value="0" style="color: white; background: black;" selected>Black (0)</option>
<option value="1" style="color: white; background: #583030;">Brown (1)</option>
<option value="2" style="color: white; background: red;">Red (2)</option>
<option value="3" style="color: black; background: orange;">Orange (3)</option>
<option value="4" style="color: black; background: yellow;">Yellow (4)</option>
<option value="5" style="color: white; background: green;">Green (5)</option>
<option value="6" style="color: white; background: blue;">Blue (6)</option>
<option value="7" style="color: white; background: purple;">Violet (7)</option>
<option value="8" style="color: white; background: gray;">Gray (8)</option>
<option value="9" style="color: black; background: white;">White (9)</option>
</select></td>
<td><select name="band3" value="2" onChange="calcResistance(this)" style="width: 150px; color: white; background: red;">
<option value="0" style="color: white; background: black;" selected>Black (1)</option>
<option value="1" style="color: white; background: #583030;">Brown (10)</option>
<option value="2" style="color: white; background: red;" selected>Red (100)</option>
<option value="3" style="color: black; background: orange;">Orange (1k)</option>
<option value="4" style="color: black; background: yellow;">Yellow (10k)</option>
<option value="5" style="color: white; background: green;">Green (100k)</option>
<option value="6" style="color: white; background: blue;">Blue (1M)</option>
<option value="7" style="color: white; background: purple;">Violet (10M)</option>
<option value="8" style="color: white; background: gray;">Gray (100M)</option>
<option value="9" style="color: black; background: white;">White (1G)</option>
</select></td>
<td>&nbsp;&nbsp;&nbsp;</td>
<td><select name="band4" value="0" onChange="calcResistance(this)" style="width: 150px; color: black; background: gold; size:5;">
<option value="10" style="color: black; background: gold;">Gold (&plusmn; 5%)</option>
<option value="11" style="color: black; background: silver;">Silver (&plusmn; 10%)</option>
</select></td></tr>
<tr><font size="24"><center><td colspan="2" align="right"><h4>Resistance:&nbsp;&nbsp;</h4></td><td colspan="3" align="left"><h4><text id="resistorValue">1,000 &ohm; &plusmn;5%</text></h4></td></center></font></tr>
</form>
</table>

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<table>

<tr align="center"><td>Value 1 (MSV)</td><td>Value 2</td><td>Weight</td><td></td><td>Tolerance</td></tr>

<tr>

<option value="0" style="color: white; background: black;">Black (0)</option>

<option value="1" style="color: white; background: #583030;" selected>Brown (1)</option>

<option value="3" style="color: black; background: orange;">Orange (3)</option>

<option value="4" style="color: black; background: yellow;">Yellow (4)</option>

<option value="5" style="color: white; background: green;">Green (5)</option>

<option value="7" style="color: white; background: purple;">Violet (7)</option>

<option value="9" style="color: black; background: white;">White (9)</option>

</select></td>

<option value="0" style="color: white; background: black;" selected>Black (0)</option>

<option value="1" style="color: white; background: #583030;">Brown (1)</option>

<option value="3" style="color: black; background: orange;">Orange (3)</option>

<option value="4" style="color: black; background: yellow;">Yellow (4)</option>

<option value="5" style="color: white; background: green;">Green (5)</option>

<option value="7" style="color: white; background: purple;">Violet (7)</option>

<option value="9" style="color: black; background: white;">White (9)</option>

</select></td>

<option value="0" style="color: white; background: black;" selected>Black (1)</option>

<option value="1" style="color: white; background: #583030;">Brown (10)</option>

<option value="3" style="color: black; background: orange;">Orange (1k)</option>

<option value="4" style="color: black; background: yellow;">Yellow (10k)</option>

<option value="5" style="color: white; background: green;">Green (100k)</option>

<option value="7" style="color: white; background: purple;">Violet (10M)</option>

<option value="9" style="color: black; background: white;">White (1G)</option>

</select></td>

<option value="11" style="color: black; background: silver;">Silver (± 10%)</option>

</select></td></tr>

<tr><font size="24"><center><td colspan="2" align="right"><h4>Resistance:  </h4></td><td colspan="3" align="left"><h4><text id="resistorValue">1,000 &ohm; ±5%</text></h4></td></center></font></tr>

</form>

</table>

You can play here on CodePen.

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