diff --git a/notes.c b/notes.c
index dbbca44..e007672 100644
--- a/notes.c
+++ b/notes.c
@@ -1,6 +1,7 @@
 /*
  *  EEL4746C - AVR Piano - Speaker Section
- *  speaker is connected to PD2 and ground, PD3-7
+ *  speaker is connected to PD2 and ground
+ *  buttons are connceted to PB0-5, PC0-5, PD3-7
  *  the LCD Arduino UNO is connected to TX/RX (PD0/1)
  */
 
@@ -37,8 +38,8 @@ unsigned short freqs[] = {
 	FREQ(7000),
 	FREQ(8000),
 };
-unsigned char note = 8;
-unsigned char buttonpressed = 1;
+unsigned char note = 0;
+unsigned char buttonpressed = 0;
 
 int
 main(void) 
@@ -79,15 +80,51 @@ main(void)
 
 ISR (PCINT0_vect)
 {
+	// check if any button on any port is pressed
+	if (PINB | PINC | PIND)
+		buttonpressed = 1;
+	else
+		buttonpressed = 0;
 
+	// check if any button in the whole port is pressed
+	for (unsigned char i = 0; i <= 5; i++) {
+		if (PINB & (1 << i)) {
+			note = i;
+			break;
+		}
+	}
 }
 
 ISR (PCINT1_vect)
 {
+	// check if any button on any port is pressed
+	if (PINB | PINC | PIND)
+		buttonpressed = 1;
+	else
+		buttonpressed = 0;
 
+	// check if any button in the whole port is pressed
+	for (unsigned char i = 0; i <= 5; i++) {
+		if (PINC & (1 << i)) {
+			note = i;
+			break;
+		}
+	}
 }
 
 ISR (PCINT2_vect)
 {
+	// check if any button on any port is pressed
+	if (PINB | PINC | PIND)
+		buttonpressed = 1;
+	else
+		buttonpressed = 0;
 
+	// check if any button in the whole port is pressed
+	for (unsigned char i = 3; i <= 7; i++) {
+		if (PIND & (1 << i)) {
+			note = i;
+			break;
+		}
+	}
 }