diff --git a/main.c b/main.c
index fd33029..153e383 100644
--- a/main.c
+++ b/main.c
@@ -1,18 +1,55 @@
 #include <msp430g2553.h>
-#include <stdint.h>
 #include <intrinsics.h>
-#include <stdlib.h>
+#include <stdint.h>
 #include <stdbool.h>
 
-#include "time.h"
-#include "PontCoopScheduler.h"
 
-#include "led.h"
-#include "pattern.h"
-#include "measure.h"
+#define DEBUG_PORT P1OUT
+#define DEBUG_PORT_DIR P1DIR
+#define DEBUG_IDLE_BIT BIT7
+#define DEBUG_ADC_BIT BIT6
+
+#define COMM_PORT_OUT P2OUT
+#define COMM_PORT_IN P2IN
+#define COMM_PORT_DIR P2DIR
+#define COMM_SAMPLE_HOLD_BIT BIT3
+#define COMM_ENABLE_BIT BIT4
+#define COMM_RESULT_BIT BIT2
+
+#define SPACE_MARK_THRESHOLD 100
 
 
-int main() {
+// ISR to read and process result from adc
+__attribute__((interrupt(ADC10_VECTOR)))
+void adcIsr(void)
+{
+    static uint16_t holdValue = 0;
+    static bool holdFlag = false;
+
+    uint16_t currentValue = ADC10MEM;
+
+    if ((COMM_PORT_IN & COMM_SAMPLE_HOLD_BIT)) {
+        if (! holdFlag) {
+            holdValue = currentValue;
+            holdFlag = true;
+        }
+    } else {
+        holdFlag = false;
+    }
+
+    if ((COMM_PORT_IN & COMM_ENABLE_BIT) && holdFlag) {
+        if (currentValue > (holdValue + SPACE_MARK_THRESHOLD)) {
+            COMM_PORT_OUT |= COMM_RESULT_BIT;
+        } else {
+            COMM_PORT_OUT &= ~COMM_RESULT_BIT;
+        }
+    }
+
+    DEBUG_PORT ^= DEBUG_ADC_BIT;
+}
+
+
+void setup() {
     WDTCTL = WDTPW | WDTHOLD;
 
     __disable_interrupt();
@@ -23,19 +60,36 @@ int main() {
     BCSCTL2 = 0;
     BCSCTL3 = 0;
 
+    // debug port configuration, obviously
+	DEBUG_PORT_DIR |= DEBUG_IDLE_BIT | DEBUG_ADC_BIT;
+	DEBUG_PORT &= ~(DEBUG_IDLE_BIT | DEBUG_ADC_BIT);
 
-    timeInit();
-    schInit();
+    // communication
+    COMM_PORT_DIR |= COMM_RESULT_BIT;
+    COMM_PORT_DIR &= ~(COMM_ENABLE_BIT | COMM_SAMPLE_HOLD_BIT);
+    COMM_PORT_OUT &= COMM_RESULT_BIT;
 
-    ledInit();
-    patternInit();
-    measureInit();
-    // ledSetMatrix(0, 0, BLUE);
+    // adc
+    ADC10CTL0 = SREF1 | REFON | ADC10ON | ADC10IE | MSC;
+    ADC10CTL1 = INCH_3 | CONSEQ_2;
+    ADC10AE0 = BIT3;
 
     __enable_interrupt();
 
+    // start the adc
+    ADC10CTL0 |= ENC | ADC10SC;    
+}
+
+
+void loop() {
+    DEBUG_PORT ^= DEBUG_IDLE_BIT;
+}
+
+
+int main() {
+    setup();
+
     while (1) {
-        schExec();
-        ledExec();
+        loop();
     }
 }