diff --git a/slave/main.c b/slave/main.c
--- a/slave/main.c
+++ b/slave/main.c
@@ -11,9 +11,142 @@
  */
 
 #include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h> 
 #include <util/delay.h>
+#include <avr/pgmspace.h>
+
+
+PROGMEM extern const prog_uchar afsk_sine_table[512] = {
+  127, 129, 130, 132, 133, 135, 136, 138, 139, 141, 143, 144, 146, 147, 149, 150, 152, 153, 155, 156, 158, 
+  159, 161, 163, 164, 166, 167, 168, 170, 171, 173, 174, 176, 177, 179, 180, 182, 183, 184, 186, 187, 188, 
+  190, 191, 193, 194, 195, 197, 198, 199, 200, 202, 203, 204, 205, 207, 208, 209, 210, 211, 213, 214, 215, 
+  216, 217, 218, 219, 220, 221, 223, 224, 225, 226, 227, 228, 228, 229, 230, 231, 232, 233, 234, 235, 236, 
+  236, 237, 238, 239, 239, 240, 241, 242, 242, 243, 244, 244, 245, 245, 246, 247, 247, 248, 248, 249, 249, 
+  249, 250, 250, 251, 251, 251, 252, 252, 252, 253, 253, 253, 253, 254, 254, 254, 254, 254, 254, 254, 254, 
+  254, 254, 255, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 253, 253, 253, 253, 252, 252, 252, 251, 
+  251, 251, 250, 250, 249, 249, 249, 248, 248, 247, 247, 246, 245, 245, 244, 244, 243, 242, 242, 241, 240, 
+  239, 239, 238, 237, 236, 236, 235, 234, 233, 232, 231, 230, 229, 228, 228, 227, 226, 225, 224, 223, 221, 
+  220, 219, 218, 217, 216, 215, 214, 213, 211, 210, 209, 208, 207, 205, 204, 203, 202, 200, 199, 198, 197, 
+  195, 194, 193, 191, 190, 188, 187, 186, 184, 183, 182, 180, 179, 177, 176, 174, 173, 171, 170, 168, 167, 
+  166, 164, 163, 161, 159, 158, 156, 155, 153, 152, 150, 149, 147, 146, 144, 143, 141, 139, 138, 136, 135, 
+  133, 132, 130, 129, 127, 125, 124, 122, 121, 119, 118, 116, 115, 113, 111, 110, 108, 107, 105, 104, 102, 
+  101,  99,  98,  96,  95,  93,  91,  90,  88,  87,  86,  84,  83,  81,  80,  78,  77,  75,  74,  72,  71, 
+   70,  68,  67,  66,  64,  63,  61,  60,  59,  57,  56,  55,  54,  52,  51,  50,  49,  47,  46,  45,  44, 
+   43,  41,  40,  39,  38,  37,  36,  35,  34,  33,  31,  30,  29,  28,  27,  26,  26,  25,  24,  23,  22, 
+   21,  20,  19,  18,  18,  17,  16,  15,  15,  14,  13,  12,  12,  11,  10,  10,   9,   9,   8,   7,   7, 
+    6,   6,   5,   5,   5,   4,   4,   3,   3,   3,   2,   2,   2,   1,   1,   1,   1,   0,   0,   0,   0, 
+    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   1,   1,   1,   1, 
+    2,   2,   2,   3,   3,   3,   4,   4,   5,   5,   5,   6,   6,   7,   7,   8,   9,   9,  10,  10,  11, 
+   12,  12,  13,  14,  15,  15,  16,  17,  18,  18,  19,  20,  21,  22,  23,  24,  25,  26,  26,  27,  28, 
+   29,  30,  31,  33,  34,  35,  36,  37,  38,  39,  40,  41,  43,  44,  45,  46,  47,  49,  50,  51,  52, 
+   54,  55,  56,  57,  59,  60,  61,  63,  64,  66,  67,  68,  70,  71,  72,  74,  75,  77,  78,  80,  81, 
+   83,  84,  86,  87,  88,  90,  91,  93,  95,  96,  98,  99, 101, 102, 104, 105, 107, 108, 110, 111, 113, 
+  115, 116, 118, 119, 121, 122, 124, 125
+};
+
+inline uint8_t afsk_read_sample(int phase)
+{
+  return pgm_read_byte_near(afsk_sine_table + phase);
+}
+
+volatile uint16_t state = 0;
+volatile uint8_t up = 1;
 
 int main(void)
 {
-  _delay_ms(4);
+
+  // Source timer2 from clkIO (datasheet p.164)
+  ASSR &= ~(_BV(EXCLK) | _BV(AS2));
+
+  // Set fast PWM mode with TOP = 0xff: WGM22:0 = 3  (p.150)
+  TCCR2A |= _BV(WGM21) | _BV(WGM20);
+  TCCR2B &= ~_BV(WGM22);
+
+  // Do non-inverting PWM on pin OC2B (arduino pin 3) (p.159).
+  // OC2A (arduino pin 11) stays in normal port operation:
+  // COM2B1=1, COM2B0=0, COM2A1=0, COM2A0=0
+  TCCR2A = (TCCR2A | _BV(COM2B1)) & ~(_BV(COM2B0) | _BV(COM2A1) | _BV(COM2A0));
+
+  // No prescaler (p.162)
+  //TCCR2B = (TCCR2B & ~(_BV(CS22) | _BV(CS21))) | _BV(CS20);
+  TCCR2B = CS22 | CS21 |  CS20;
+    
+  // Enable interrupt when TCNT2 reaches TOP (0xFF) (p.151, 163)
+	//TIMSK2 |= _BV(TOIE2);
+	TIMSK2 |= 0b00000111;
+
+	
+	
+	
+
+	// Initialize PORTA
+	DDRA = 0xff;
+	PORTA = 0x00;
+	
+	DDRD = 0xff;
+	PORTD = 0xff;
+	
+	sei();
+
+		
+	while(1) {
+		//PORTA ++;
+		/*
+		if(state < 512) {
+			OCR2B = afsk_sine_table[state];
+		}
+		else {
+			state = 0;
+			OCR2B = afsk_sine_table[state];
+		}
+			*/
+		/*
+		OCR2B = afsk_sine_table[state];
+		
+
+		if(up==1)
+			state++;
+		else
+			state--;
+
+		if(state <= 0)
+			up = 1;
+		else if(state >= 254)
+			up = 0;
+			*/
+		_delay_us(10);
+	}
 }
+
+
+volatile uint8_t meh = 1;
+
+void frick() {
+	meh = meh + 5;
+	//OCR2B = 0x09;
+	OCR2B += meh;// = meh;// = afsk_read_sample(meh);
+}
+
+ISR(TIMER2_OVF_vect) {
+/*
+	PORTA = 0xff;
+	_delay_ms(500);
+	PORTA = 0x00;
+	_delay_ms(500);  */
+	frick();
+	//meh++;
+	//OCR2B = 0x90;
+	/*
+  // [...] load the next sample
+  if(state < 512) {
+	OCR2B = afsk_sine_table[state];
+	}
+	else {
+		state = 0;
+	}*/
+
+
+			
+	return;
+}