diff --git a/main.c b/main.c
index 77784b3..f234c55 100644
--- a/main.c
+++ b/main.c
@@ -2,11 +2,49 @@
 #include <util/delay.h>
 #include "pins.h"
 
+#define USART_BAUDRATE 9600
+#define BAUD_PRESCALE (((16000000UL/(USART_BAUDRATE*16UL)))-1)
+
+void loop();
+
 int main(){
+	digitalPinMode(6, INPUT);
+	digitalPinMode(7, INPUT);
+	digitalPinMode(12, OUTPUT);
+
+	// TODO verstehen und dann in Funktion packen
+	UCSR0B |= (1<<RXEN0)|(1<<TXEN0);
+	UCSR0C |= (1<<UCSZ00)|(1<<UCSZ01);
+	UBRR0H  = BAUD_PRESCALE>>8;
+	UBRR0L  = BAUD_PRESCALE;
+
 	while(1){
-		digitalWrite(5, HIGH);
-		_delay_ms(1000);
-		digitalWrite(5, LOW);
-		_delay_ms(1000);
+		loop();
 	}
 }
+
+void loop(){
+	/*if(DDRB&0x10){
+		digitalWrite(12, HIGH);
+	}
+	else{
+		digitalWrite(12, LOW);
+	}*/
+
+	// TODO verstehen und dann in Funktion packen
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = 'h';
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = 'e';
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = 'l';
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = 'l';
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = 'o';
+	while(!(UCSR0A&(1<<UDRE0)));
+	UDR0 = '\n';
+//	while(!(SPSR&(1<<SPIF)));
+
+	_delay_ms(1000);
+}
diff --git a/pins.c b/pins.c
index 8ef18af..67678ad 100644
--- a/pins.c
+++ b/pins.c
@@ -3,6 +3,50 @@
 
 const unsigned char LOW = 0x00;
 const unsigned char HIGH = 0x01;
+const unsigned char INPUT = 0x00;
+const unsigned char OUTPUT = 0x01;
+
+void digitalPinMode(unsigned char pin, unsigned char mode){
+	if(pin > 13){
+		return;
+	}
+
+	if(pin < 8){
+		if(mode == INPUT){
+			DDRD &= ~_BV(DDD0+pin);
+		}
+		else{
+			DDRD |= _BV(DDD0+pin);
+		}
+	}
+	else{
+		pin -= 8;
+
+		if(mode == INPUT){
+			DDRB &= ~_BV(DDB0+pin);
+		}
+		else{
+			DDRB |= _BV(DDB0+pin);
+		}
+	}
+}
+
+int digitalRead(unsigned char pin){
+	if(pin > 13){
+		return 0;
+	}
+
+	// TODO turn off pwm
+
+	if(pin < 8){
+		// pin 0-7
+		return PIND&_BV(DDD0+pin);
+	}
+
+	// pin 8-13
+	pin -= 8;
+	return PINB&_BV(DDB0+pin);
+}
 
 void digitalWrite(unsigned char pin, unsigned char value){
 	if(pin > 13){
@@ -13,7 +57,7 @@ void digitalWrite(unsigned char pin, unsigned char value){
 
 	if(pin < 8){
 		// pin 0-7
-		DDRD |= _BV(DDD0+pin);
+//		DDRD |= _BV(DDD0+pin);
 
 		if(value == HIGH){
 			PORTD |= _BV(DDD0+pin);
@@ -24,7 +68,8 @@ void digitalWrite(unsigned char pin, unsigned char value){
 	}
 	else{
 		// pin 8-13
-		DDRB |= _BV(DDB0+pin);
+		pin -= 8;
+//		DDRB |= _BV(DDB0+pin);
 
 		if(value == HIGH){
 			PORTB |= _BV(DDB0+pin);
@@ -35,6 +80,27 @@ void digitalWrite(unsigned char pin, unsigned char value){
 	}
 }
 
+void analogPinMode(unsigned char pin, unsigned char mode){
+	if(pin > 7){
+		return;
+	}
+
+	if(mode == INPUT){
+		DDRC &= ~_BV(DDC0+pin);
+	}
+	else{
+		DDRC |= _BV(DDC0+pin);
+	}
+}
+
+int analogRead(unsigned char pin){
+	if(pin > 7){
+		return 0;
+	}
+
+	return PINC&_BV(DDC0+pin);
+}
+
 void analogWrite(unsigned char pin, unsigned char value){
 	if(pin > 7){
 		return;
diff --git a/pins.h b/pins.h
index 4af9988..7187c74 100644
--- a/pins.h
+++ b/pins.h
@@ -3,8 +3,15 @@
 
 extern const unsigned char LOW;
 extern const unsigned char HIGH;
+extern const unsigned char INPUT;
+extern const unsigned char OUTPUT;
 
+void digitalPinMode(unsigned char, unsigned char);
+int digitalRead(unsigned char);
 void digitalWrite(unsigned char, unsigned char);
+
+void analogPinMode(unsigned char, unsigned char);
+int analogRead(unsigned char);
 void analogWrite(unsigned char, unsigned char);
 
 #endif