diff --git a/driver/gnuplotscript.gp b/driver/gnuplotscript.gp
index 5b0e0d3..a3f7c3e 100644
--- a/driver/gnuplotscript.gp
+++ b/driver/gnuplotscript.gp
@@ -11,9 +11,9 @@ set label at 4,7 'U_{GS} [V] = 480' left
 set label at 3,13 'U_{GS} [V] = 500' left
 set label at 2,22 'U_{GS} [V] = 520' left
 set label at 1,32 'U_{GS} [V] = 540' left
-set label at 0,41 'U_{GS} [V] = 560' left
-set label at 0,42 'U_{GS} [V] = 580' left
-set label at 0,42 'U_{GS} [V] = 600' left
+set label at 0,39 'U_{GS} [V] = 560' left
+set label at 0,39 'U_{GS} [V] = 580' left
+set label at 0,39 'U_{GS} [V] = 600' left
 unset output 
 set terminal qt
 unset output
diff --git a/driver/main b/driver/main
index 6d56236..0cb40b6 100755
Binary files a/driver/main and b/driver/main differ
diff --git a/driver/main.cpp b/driver/main.cpp
index 2575520..4519a31 100644
--- a/driver/main.cpp
+++ b/driver/main.cpp
@@ -158,9 +158,9 @@ void testFunktionen()
 
 int main()
 {
-	testFunktionen();
+	//testFunktionen();
 	//kennlinieZweiterQuadrant();
-	//kennlinieErsterQuadrant();
+	kennlinieErsterQuadrant();
 	
 	std::cout << "Schluss." << std::endl;
 }
diff --git a/driver/test_plot b/driver/test_plot
index f98a2e7..e4006b1 100644
Binary files a/driver/test_plot and b/driver/test_plot differ
diff --git a/firmware/B15F.elf b/firmware/B15F.elf
index 7e89b34..931fc11 100755
Binary files a/firmware/B15F.elf and b/firmware/B15F.elf differ
diff --git a/firmware/adu.cpp b/firmware/adu.cpp
index d6eb119..3e7faff 100644
--- a/firmware/adu.cpp
+++ b/firmware/adu.cpp
@@ -5,23 +5,28 @@ void ADU::init() volatile
 	// externe Referenz an AREF
 	ADMUX = 0;
 
-	// ADC aktiviert, prescaler = 128
-	ADCSRA = _BV(ADEN) | _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0);
+	// ADC aktiviert, Interruptbetrieb, prescaler = 128
+	ADCSRA = _BV(ADEN) | _BV(ADIE) | _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0);
+}
+
+void ADU::handleConversionComplete() volatile
+{
+	active = false;
 }
 
 uint16_t ADU::getValue(uint8_t channel) volatile
 {
+	while(active);
+	active = true;
+	
 	// lege Kanal fest
 	ADMUX = (ADMUX & 0xE0) | channel;
 
 	// starte Konvertierung
 	ADCSRA |= _BV(ADSC);
 	
-	// warte Konvertierungszeit ab
-	_delay_us(13 * 1000000 * 128 / F_CPU + 1);
-
-	// warte auf Ende
-	while(ADCSRA & _BV(ADSC));
+	// warte auf Ende der Konvertierung
+	while(active);
 	
 	return ADCW;
 }
diff --git a/firmware/adu.h b/firmware/adu.h
index 8b63d59..521543e 100644
--- a/firmware/adu.h
+++ b/firmware/adu.h
@@ -2,14 +2,29 @@
 #define ADC_H
 
 #include <avr/io.h>
-#include <util/delay.h>
-#include <stdint.h>
 
 class ADU
 {
 public:
+
+	/**
+	 * Konfiguriert die ADC Register
+	 */
 	void init(void) volatile;
-	uint16_t getValue(uint8_t) volatile;
+	
+	/**
+	 * Behandlungsroutine für ADC interrupt
+	 */
+	void handleConversionComplete(void) volatile;
+	
+	/**
+	 * Startet eine AD Konvertierung, wartet auf Abschluss und liefert Ergebnis
+	 * \param channel Auswahl des ADC Kanals (0-7), Kanal 6 und 7 sind Poti R36 und R37 
+	 */
+	uint16_t getValue(uint8_t channel) volatile;
+	
+private:
+	volatile bool active = false;
 };
 
 #endif // ADC_H
diff --git a/firmware/interrupts.cpp b/firmware/interrupts.cpp
index 68319ae..d84bcb0 100644
--- a/firmware/interrupts.cpp
+++ b/firmware/interrupts.cpp
@@ -15,3 +15,8 @@ ISR(SPI_STC_vect)
 {
 	spi.handleTransfer();
 }
+
+ISR(ADC_vect)
+{
+	adu.handleConversionComplete();
+}
diff --git a/firmware/spi.cpp b/firmware/spi.cpp
index 1c191ed..87e005e 100644
--- a/firmware/spi.cpp
+++ b/firmware/spi.cpp
@@ -9,10 +9,10 @@ void SPI::init() const volatile
 	// Konfiguriere DMUX DDRs
 	DDRD |= _BV(DMUX1) | _BV(DMUX2) | _BV(DMUX3);
 
-	// aktiviere SPI, Master Modus, SPI Modus 0
+	// aktiviere SPI, Interruptbetrieb, Master Modus, SPI Modus 0
 	// F_SPI = F_CPU / 2   (prescaler 2)
 	SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPIE);
-	SPSR = _BV(SPI2X) | _BV(SPIF);
+	SPSR = _BV(SPI2X);
 
 	// waehle keinen SPI Slave aus
 	setAdr(SPIADR::NONE);