diff --git a/Geigerzaehler/main.c b/Geigerzaehler/main.c
index 7515981..c5241cc 100644
--- a/Geigerzaehler/main.c
+++ b/Geigerzaehler/main.c
@@ -17,17 +17,15 @@
 
 // Global variable declaration
 uint16_t boost_frequency = 2000;		// 2kHz frequency
+uint16_t signalOutput_time = 200;		// 200ms
 
-uint8_t boost_enable	=	0;
 uint8_t boost_highVoltage_nextHigh	=	1;
 uint16_t boost_highVoltage_nextTick	=	0;
 
-// Todo [CRITICAL]: Clock does not exist! Use timer.
-
-uint8_t signalOutput_enable	=	0;
 uint8_t signalOutput_nextHigh	=	1;
 uint16_t signalOutput_nextTick	=	0;
 
+uint8_t timer1_prescaler = 256;
 
 int main()
 {
@@ -59,87 +57,93 @@ int main()
 	// Endless loop
     while (1) 
     {
-		// HighVoltage boosting
-		if(boost_enable == 1)
+		/*
+		 * HighVoltage boosting
+		 */
+		if(boost_highVoltage_nextTick > 0 && TCNT1 >= boost_highVoltage_nextTick)	// If we are on or after the tick it should be executed
 		{
-			if(TCNT1 >= boost_highVoltage_nextTick)	// If we are on or after the tick it should be executed
+			// Set pin according to next exec
+			if(boost_highVoltage_nextHigh == 1)		
 			{
-				// Set pin according to next exec
-				if(boost_highVoltage_nextHigh == 1)		// Set it high
-				{
-					PORTD |= (1 << PORTD4);
-					boost_highVoltage_nextHigh = 0;	// Next is low
-				}
-				else  								// Set it low
-				{
-					PORTD |= (0 << PORTD4);
-					boost_highVoltage_nextHigh = 1;	// Next is high
-				}
-				
-				// Calculate when next high/low should be set
-				boost_highVoltage_nextTick = TCNT1 + F_CPU/256 * 1/(boost_frequency/2);		// Half of time it should be high/low
+				// Set it high
+				PORTD |= (1 << PORTD4);
+				boost_highVoltage_nextHigh = 0;	// Next is low
 			}
-		}else
-		{
-			if(boost_highVoltage_nextTick > 0)		// If boosting is deactivated, but the nextTick was not reset yet
+			else  								
 			{
-				// Reset boost-state
+				// Set it low
 				PORTD |= (0 << PORTD4);
-				boost_highVoltage_nextHigh = 1;
-				boost_highVoltage_nextTick = 0;
+				boost_highVoltage_nextHigh = 1;	// Next is high
 			}
+				
+			// Calculate when next high/low should be set
+			boost_highVoltage_nextTick = TCNT1 + F_CPU/timer1_prescaler * 1/(boost_frequency/2);		// Half of time it should be high/low
+			if(boost_highVoltage_nextTick == 0) boost_highVoltage_nextTick++;		// If its 0, it stops, we dont want that
 		}
 		
-		
-		// Signal output
-		if(signalOutput_enable)
+		/*
+		 * Signal output
+		 */
+		if(signalOutput_nextTick > 0 && TCNT1 >= signalOutput_nextTick)	// If we are on or after the tick it should be executed
 		{
-			if(TCNT1 >= signalOutput_nextTick)	// If we are on or after the tick it should be executed
+			// Set pin according to next exec
+			if(signalOutput_nextHigh == 1)		// Set it high
 			{
-				// Set pin according to next exec
-				if(signalOutput_nextHigh == 1)		// Set it high
-				{
-					PORTD |= (1 << PORTD5);
-					PORTD |= (1 << PORTD6);
-					signalOutput_nextHigh = 0;	// Next is low
-				}
-				else  								// Set it low
-				{
-					PORTD |= (0 << PORTD5);
-					PORTD |= (0 << PORTD6);
-					signalOutput_nextHigh = 1;	// Next is high
-					
-					signalOutput_enable = 0;	// Disable signalOutput
-				}
+				PORTD |= (1 << PORTD5);
+				PORTD |= (1 << PORTD6);
+				signalOutput_nextHigh = 0;	// Next is low
+			}
+			else  								// Set it low
+			{
+				PORTD |= (0 << PORTD5);
+				PORTD |= (0 << PORTD6);
+				signalOutput_nextHigh = 1;	// Next is high
 				
-				// When the signal should stop
-				signalOutput_nextTick = TCNT1 + F_CPU/256 * 0.2; 		// nextTick is in 0.2s
+				signalOutput_nextTick = 0;	// Disable signalOutput
 			}
+			
+			// When the signal should stop
+			signalOutput_nextTick = TCNT1 + F_CPU/timer1_prescaler * signalOutput_time/1000; 		// nextTick is in signalOutput_time in ms
+			if(signalOutput_nextTick == 0) signalOutput_nextTick++;		// If its 0, it stops, we dont want that
 		}
     }
 }
 
+/* 
+ * Init timer1 (16-bit) in "normal mode"
+ */
 void timer1_init()
 {
-	// set up timer with prescaler = 256
-	TCCR1B |= (1 << CS12);
+	// set up timer with speed: cpu-clock / prescaler
+	switch(timer1_prescaler){		// [CS12	CS11	CS10]
+		default:
+		case 1:
+			TCCR1B |= (1 << CS10);	// [0		0		1	]
+			break;
+		
+		case 8:
+			TCCR1B |= (1 << CS11);	// [0		1		0	]
+			break;
+		
+		case 64:
+			TCCR1B |= (1 << CS10);	// [0		1		1	]
+			TCCR1B |= (1 << CS11);
+			break;
+		
+		case 256:
+			TCCR1B |= (1 << CS12);	// [1		0		0	]
+			break;
+			
+		case 1024:
+			TCCR1B |= (1 << CS10);	// [1		0		1	]
+			TCCR1B |= (1 << CS12);
+			break;
+	}
 	
 	// initialize counter
 	TCNT1 = 0;
 }
 
-ISR(TIMER1_COMPA_vect){
-
-	//Code Kanal A Timer 1
-
-}
-
-ISR(TIMER1_COMPB_vect){
-
-	//Code Kanal B Timer 1
-
-}
-
 
 /*
  * Interrupt-handler
@@ -152,12 +156,16 @@ ISR(INT0_vect)
 	if(!(PIND & (1 << PORTD2)))	// Falling edge
 	{	
 		// Below ~400V, activate booster
-		boost_enable = 1;
+		boost_highVoltage_nextTick = 1;	//  Run as soon as possible
 	}
 	else					// Rising edge
 	{
 		// Reached ~400V, deactivate booster
-		boost_enable = 0;
+		boost_highVoltage_nextTick = 0;
+		
+		// reset state
+		PORTD |= (0 << PORTD4);			// pin on low
+		boost_highVoltage_nextHigh = 1;	// next is high
 	}
 	
 	reti();		// Exit interrupt-handler
@@ -168,9 +176,7 @@ ISR(INT0_vect)
 ISR(INT1_vect)
 {
 	// Tick detected, signalOutput
-	signalOutput_enable = 1;
-	// Execute immediately
-	signalOutput_nextTick = 0;
+	signalOutput_nextTick = 1;	//  Run as soon as possible
 	
 	reti();		// Exit interrupt-handler
 }