inductance meter

Projects General Guidance
1

I got the idea and schematic from
Using An Arduino To Measure Inductance | Hackaday.

code is uploading correctly but when i made connections as shown in ckt dia.then arduino does not work.I am not getting what is exact problem

InductanceMeter.pdf (12.6 KB)

2

You haven't really explained what is wrong.

3

Hello aarg,

when i give power supply of 5v to ckt from arduino then arduino gets off.
i checked all my connections again and again.

4

This is the circuit

905×386 5.45 KB

Did you connect the Pin 3 of LM339 to 5V and pin 12 to Gnd?

Did you ground all the unuse inputs of LM339?

Code

//13 is the input to the circuit (connects to 150ohm resistor), 11 is the comparator/op-amp output.
//reibot.org for guide
// http://reibot.org/2011/07/19/measuring-inductance/

double pulse, frequency, capacitance, inductance;
void setup(){
	Serial.begin(115200);
	pinMode(11, INPUT);
	pinMode(13, OUTPUT);
	Serial.println("Why hello!");
	delay(200);
}

void loop(){
	digitalWrite(13, HIGH);
	delay(5);//give some time to charge inductor.
	digitalWrite(13,LOW);
	delayMicroseconds(100); //make sure resination is measured
	pulse = pulseIn(11,HIGH,5000);//returns 0 if timeout
	if(pulse > 0.1){ //if a timeout did not occur and it took a reading:
		capacitance = 2.E-6; //insert capacitance here. Currently using 2uF
		frequency = 1.E6/(2*pulse);
		inductance = 1./(capacitance*frequency*frequency*4.*3.14159*3.14159);//one of my profs told me just do squares like this
		inductance *= 1E6; //note that this is the same as saying inductance = inductance*1E6
		Serial.print("High for uS:");
		Serial.print( pulse );
		Serial.print("\tfrequency Hz:");
		Serial.print( frequency );
		Serial.print("\tinductance uH:");
		Serial.println( inductance );
		delay(20);
	}
}