diff --git a/pins.c b/ard/pins.c
similarity index 100%
rename from pins.c
rename to ard/pins.c
diff --git a/pins.h b/ard/pins.h
similarity index 100%
rename from pins.h
rename to ard/pins.h
diff --git a/serial.c b/ard/serial.c
similarity index 100%
rename from serial.c
rename to ard/serial.c
diff --git a/serial.h b/ard/serial.h
similarity index 100%
rename from serial.h
rename to ard/serial.h
diff --git a/compile b/compile
index 65e703a..dd1150a 100755
--- a/compile
+++ b/compile
@@ -1,8 +1,8 @@
 #!/bin/bash
 
 mkdir build
-avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o build/serial.o -Wall serial.c
-avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o build/pins.o -Wall pins.c
+avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o build/serial.o -Wall ard/serial.c
+avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o build/pins.o -Wall ard/pins.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o build/main.o -Wall main.c
 avr-gcc -mmcu=atmega328p build/*.o -o build/main
 avr-objcopy -O ihex -R .eeprom build/main build/main.hex
diff --git a/main.c b/main.c
index 1fca18a..fef1763 100644
--- a/main.c
+++ b/main.c
@@ -2,8 +2,8 @@
 #include <avr/interrupt.h>
 #include <util/delay.h>
 #include <stdio.h>
-#include "serial.h"
-#include "pins.h"
+#include "ard/serial.h"
+#include "ard/pins.h"
 
 void prepare();
 void loop();
@@ -27,8 +27,11 @@ void prepare(){
 	pin_mode(8, INPUT);*/
 
 	// anlog input example
-	pin_mode(A1, INPUT);
-	pin_mode(A2, INPUT);
+	/*pin_mode(A1, INPUT);
+	pin_mode(A2, INPUT);*/
+
+	// PWM example
+	pin_mode(3, OUTPUT);
 }
 
 void loop(){
@@ -41,11 +44,14 @@ void loop(){
 	}*/
 
 	// anlog input example
-	int analog1 = analog_read(A1);
+	/*int analog1 = analog_read(A1);
 	int analog2 = analog_read(A2);
 	char out[15];
 	sprintf(out, "%d %d", analog1, analog2);
-	serial_write(out, 15);
+	serial_write(out, 15);*/
+
+	// PWM example
+	digital_write(3, HIGH);
 
 	_delay_ms(25);
 }