diff --git a/src/main.c b/src/main.c
index 97fdebc..7ee1421 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,24 +10,157 @@
 
 static void ioinit(void)
 {
-	DDRD = (1<<LED); /* set LED pin as output */
-	uart_init(); /* initialize UART */
+	/* configure power */
+	DDRB = ~(1<<PWR_OK)|(1<<nPS_ON); /* PWR_OK is input, nPS_ON is output */
+	PORTB |= (1<<nPS_ON); /* witch off power supply */
+
+	/* configure peripherals */
+	DDRD |= (1<<LED); /* LED is output */
+	DDRB &= ~(1<<IR); /* IR receiver is input */
+	DDRC &= ~(1<<FAN); /* FAN is input */
+
+	/* configure channels (used for powering LEDs using an nMOS) */
+	DDRC |= (1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5); /* CH1_x is output */
+	PORTC &= ~((1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5)); /* switch off CH1_x */
+	DDRD |= (1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5); /* CH2_x is output */
+	PORTD &= ~((1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5)); /* switch off CH2_x */
+
+	/* use UART as terminal */
+	uart_init();
 	stdout = &uart_output;
 	stdin  = &uart_input;
+
 }
 
 int main(void)
 {
 	ioinit(); /* initialize IOs */
 
-	uint8_t i;
+	char input;
 
 	puts("Hello world!");
-	
-	/* blink LED */
-	for (i = 0; i < 100; i++) {
-		PIND |= (1<<LED); /* toggle LED */
-		_delay_ms(1000);
+	_delay_ms(1000);
+	while(1) {
+		input = getchar();
+		printf("%c\n", input);
+		switch (input) {
+			case 'l':
+				PIND |= (1<<LED);
+				printf("LED: ");
+				if (PIND&(1<<LED)) {
+					puts("off");
+				} else {
+					puts("on");
+				}
+				break;
+			case 'a':
+				PINB |= (1<<nPS_ON);
+				printf("power supply: ");
+				if (PINB&(1<<nPS_ON)) {
+					puts("off");
+				} else {
+					puts("on");
+				}
+				break;
+			case 's':
+				printf("power: ");
+				if (PINB&(1<<PWR_OK)) {
+					puts("ok");
+				} else {
+					puts("ko");
+				}
+				break;
+			case '1':
+				PINC |= (1<<CH1_1);
+				printf("CH1_1: ");
+				if (PINC&(1<<CH1_1)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '2':
+				PINC |= (1<<CH1_2);
+				printf("CH1_2: ");
+				if (PINC&(1<<CH1_2)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '3':
+				PINC |= (1<<CH1_3);
+				printf("CH1_3: ");
+				if (PINC&(1<<CH1_3)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '4':
+				PINC |= (1<<CH1_4);
+				printf("CH1_4: ");
+				if (PINC&(1<<CH1_4)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '5':
+				PINC |= (1<<CH1_5);
+				printf("CH1_5: ");
+				if (PINC&(1<<CH1_5)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '6':
+				PIND |= (1<<CH2_1);
+				printf("CH2_1: ");
+				if (PIND&(1<<CH2_1)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '7':
+				PIND |= (1<<CH2_2);
+				printf("CH2_2: ");
+				if (PIND&(1<<CH2_2)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '8':
+				PIND |= (1<<CH2_3);
+				printf("CH2_3: ");
+				if (PIND&(1<<CH2_3)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '9':
+				PIND |= (1<<CH2_4);
+				printf("CH2_4: ");
+				if (PIND&(1<<CH2_4)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+			case '0':
+				PIND |= (1<<CH2_5);
+				printf("CH2_5: ");
+				if (PIND&(1<<CH2_5)) {
+					puts("on");
+				} else {
+					puts("off");
+				}
+				break;
+		}
 	}
 
 	return 0;
diff --git a/src/main.h b/src/main.h
index 1f73334..1f92129 100644
--- a/src/main.h
+++ b/src/main.h
@@ -1,3 +1,19 @@
-#define LED PD6 /* LED port */
+/* ports */
+#define LED PD6 /* status LED */
+#define IR PB0 /* IR receiver */
+#define FAN PC5 /* FAN output */
+#define PWR_OK PB1 /* ATX power OK */
+#define nPS_ON PB2 /* ATX power supply ON switch */
+/* LEDs */
+#define CH1_1 PC0
+#define CH1_2 PC1
+#define CH1_3 PC2
+#define CH1_4 PC3
+#define CH1_5 PC4
+#define CH2_1 PD2
+#define CH2_2 PD3
+#define CH2_3 PD4
+#define CH2_4 PD5
+#define CH2_5 PD7
 
 static void ioinit(void);