Difference between revisions of "CalcHowTo"

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Intro
 
  
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== Intro ==
 
As an electrial engineer I spent a lot of time using and creating excel based calculators. The problem I have is when I or other people make minor changes we rarely ever syncronize our updatse. Eventually we just redesign the calculators from scratch. To try and reduce time I wanted to create them in javascript on a webpage. That way I know I can access it anywhere and update it on any pc.
 
As an electrial engineer I spent a lot of time using and creating excel based calculators. The problem I have is when I or other people make minor changes we rarely ever syncronize our updatse. Eventually we just redesign the calculators from scratch. To try and reduce time I wanted to create them in javascript on a webpage. That way I know I can access it anywhere and update it on any pc.
  
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example
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code
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== Sample Calculator ==
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[http://www.cunningturtle.com/wordpress/wp-content/uploads/2011/12/LED-Resistor-Calc.html Example Calculator]
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<pre>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML><HEAD><TITLE>Current Limiting Resistor Calculator</TITLE>
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<SCRIPT language=JavaScript>
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function Compute1(form) {
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with(Math) {
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var Precision= 0;
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var Vin= Number(form.Vin.value);
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var Vled= Number(form.Vled.value);
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var Iled= Number(form.Iled.value);
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Rled= (Vin-Vled)/(Iled/1000);
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Wresistor= (Vin-Vled)*(Iled/1000);
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if(Rled<0) {
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alert("the numbers you entered don't make sense!!!");
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}
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form.Rled.value= Rled.toFixed(Precision);
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Precision= 3;
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form.Wresistor.value= Wresistor.toFixed(Precision);
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}
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}
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</SCRIPT>
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<META name=GENERATOR content="MSHTML 8.00.6001.19154"></HEAD>
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      <FORM method=post name=ParamForm action="">
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      <TABLE border=1>
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        <TBODY>
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<TR>
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          <TD colSpan=2>
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          <P align=center><FONT face=Arial><B>LED Current Limiting Resistor Calc</B></FONT></P></TD></TR>
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        <TR>
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          <TD><FONT size=3 face=Arial>Voltage Input</FONT></TD>
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          <TD><FONT face=Arial><INPUT value=5 size=17 name=Vin> (V)</FONT></TD></TR>
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        <TR>
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          <TD><FONT face=Arial>LED Voltage</FONT></TD>
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          <TD><FONT face=Arial><INPUT value=2.1 size=17 name=Vled> (V)</FONT></TD></TR>
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        <TR>
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          <TD><FONT face=Arial>LED Current</FONT></TD>
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          <TD><FONT face=Arial><INPUT value=20 size=17 name=Iled> (mA)</FONT></TD></TR>
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        <TR>
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          <TD colSpan=2>
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          <P align=center><FONT face=Arial><B>Results</B></FONT></P></TD></TR>
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        <TR>
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          <TD><FONT face=Arial>Current Limiting Resistor<BR><INPUT size=17 name=Rled>(Ohms)<BR><INPUT onclick=Compute1(document.ParamForm) value="Submit" type=button></FONT></TD>
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          <TD><FONT face=Arial>Resistor Power rating<BR><INPUT size=17 name=Wresistor>(Watts)<BR></FONT></TD>
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</HTML>
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</pre>

Latest revision as of 14:57, 15 December 2011

Intro

As an electrial engineer I spent a lot of time using and creating excel based calculators. The problem I have is when I or other people make minor changes we rarely ever syncronize our updatse. Eventually we just redesign the calculators from scratch. To try and reduce time I wanted to create them in javascript on a webpage. That way I know I can access it anywhere and update it on any pc.


Sample Calculator

Example Calculator 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Current Limiting Resistor Calculator</TITLE>

<SCRIPT language=JavaScript>

function Compute1(form) {
	with(Math) {
		var Precision= 0;
		var Vin= Number(form.Vin.value);
		var Vled= Number(form.Vled.value);
		var Iled= Number(form.Iled.value);
				
		Rled= (Vin-Vled)/(Iled/1000);
		Wresistor= (Vin-Vled)*(Iled/1000);
		
		if(Rled<0) {
			alert("the numbers you entered don't make sense!!!");
		}
		
		form.Rled.value= Rled.toFixed(Precision);
		Precision= 3;
		form.Wresistor.value= Wresistor.toFixed(Precision);
	}
}

</SCRIPT>

<META name=GENERATOR content="MSHTML 8.00.6001.19154"></HEAD>

      <FORM method=post name=ParamForm action="">
      <TABLE border=1>
        <TBODY>
		<TR>
           <TD colSpan=2>
           <P align=center><FONT face=Arial><B>LED Current Limiting Resistor Calc</B></FONT></P></TD></TR>
        <TR>
          <TD><FONT size=3 face=Arial>Voltage Input</FONT></TD>
          <TD><FONT face=Arial><INPUT value=5 size=17 name=Vin> (V)</FONT></TD></TR>
        <TR>
          <TD><FONT face=Arial>LED Voltage</FONT></TD>
          <TD><FONT face=Arial><INPUT value=2.1 size=17 name=Vled> (V)</FONT></TD></TR>
        <TR>
          <TD><FONT face=Arial>LED Current</FONT></TD>
          <TD><FONT face=Arial><INPUT value=20 size=17 name=Iled> (mA)</FONT></TD></TR>
        <TR>
          <TD colSpan=2>
          <P align=center><FONT face=Arial><B>Results</B></FONT></P></TD></TR>
        <TR>
          <TD><FONT face=Arial>Current Limiting Resistor<BR><INPUT size=17 name=Rled>(Ohms)<BR><INPUT onclick=Compute1(document.ParamForm) value="Submit" type=button></FONT></TD>
          <TD><FONT face=Arial>Resistor Power rating<BR><INPUT size=17 name=Wresistor>(Watts)<BR></FONT></TD>

</HTML>
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