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  • Author Author: martinvalencia
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TI Hercules LaunchPad Type 1: Inductance Meter

martinvalencia

Above is the LM311 operating as oscillator whose frequency depends on the capacitance and inductance of the resonant circuit.

ea79976c33a791279ab141d661623acf.png

 

Without any element to measure the circuit will oscillate at approximately 555,800 Hz and the capacity or inductance place its oscillation frequency is changed

 

The Hercules RM42x frequency measured by the HET [0] is the counter input and from it calculates the value of the inductance.

 

Range: 10nH <Inductance <100mH

 

Schematic Circuit

Boardimage

imageimage

Photo:

image

Operation Video:

                                                                                   

 

Code:

Code:

edgeResetCounter(hetRAM1,edge0);
wait_secons(1.05); // windows time
frec=edgeGetCounter(hetRAM1,edge0);
clear();

sprintf(Mensaje," %lu Hz",frec);


if(frec>50)
{
float32 Landa=(float32)(1/(2*pi*frec));

Landa=Landa*Landa;
Landa=Landa*(1/1e-9)-100e-6;

if(frec<151e3)
{
Lx=Landa*1e3;
if(Lx<10000)
sprintf(Mensaje2," %4.3f mH",Lx);
else
{
Lx=Lx/1000;
sprintf(Mensaje2," %3.3f H",Lx);
}

}
else
{
Lx=Landa*1e6;

sprintf(Mensaje2," %5.3f uH",Lx);
}


lcdSetCursor(0,0);
lcdPrint(Mensaje);
lcdSetCursor(0,1);
lcdPrint(Mensaje2);
//wait_secons(400e-3);
}
else
{
sprintf(Mensaje," Lx --[///]--");
sprintf(Mensaje2,"Waiting");

lcdSetCursor(0,0);
lcdPrint(Mensaje);
lcdSetCursor(0,1);
lcdPrint(Mensaje2);
puntitos();

}