diff --git a/src/time.cpp b/src/engine.cpp
similarity index 89%
rename from src/time.cpp
rename to src/engine.cpp
index 6607b26..e7c270e 100644
--- a/src/time.cpp
+++ b/src/engine.cpp
@@ -8,7 +8,7 @@
 #include <signal.h>
 #include <stdint.h>
 
-#include "time.h"
+#include "engine.h"
 
 
 volatile uint16_t timestamp = 0;
@@ -64,7 +64,7 @@ interrupt (TIMER0_A0_VECTOR) timer0a0_isr(void) {
 }
 
 
-void timeInit() {
+void engineInit() {
 	timestamp = 0;
 
 	P1DIR |= BIT0 | BIT1 | BIT6;
@@ -88,4 +88,10 @@ uint32_t ticks() {
     return t;
 }
 
+uint16_t engineMaxPwmValue() {
+	return TICK;
+}
 
+void engineSetPwmValue(uint16_t val) {
+	TACCR1 = val;
+}
diff --git a/src/engine.h b/src/engine.h
new file mode 100644
index 0000000..93495b8
--- /dev/null
+++ b/src/engine.h
@@ -0,0 +1,21 @@
+/*
+ * time.h
+ *
+ *  Created on: 17.01.2016
+ *      Author: wn
+ */
+
+#ifndef ENGINE_H_
+#define ENGINE_H_
+
+
+
+void engineInit();
+uint32_t ticks();
+uint16_t engineMaxPwmValue();
+void engineSetPwmValue(uint16_t val);
+
+
+
+
+#endif /* ENGINE_H_ */
diff --git a/src/hmi.cpp b/src/hmi.cpp
new file mode 100644
index 0000000..bc456d1
--- /dev/null
+++ b/src/hmi.cpp
@@ -0,0 +1,121 @@
+#include <msp430g2553.h>
+#include <stdint.h>
+
+#include "hmi.h"
+#include "engine.h"
+
+
+
+
+class SwitchPort {
+public:
+  enum e_Value { e_NIL, e_SHORT, e_LONG };
+  SwitchPort(uint16_t bit, uint16_t inRegister) : m_bit(bit), m_state(0), m_cnt(0), m_inRegister(inRegister) {
+  };
+  e_Value get() {
+    e_Value result = e_NIL;
+    switch (m_state) {
+    case 0:
+      if (getInValue()) {
+        m_state = 1;
+      } else {
+        m_cnt++;
+      }
+      break;
+    case 1:
+      if (m_cnt > LONG_THRESHOLD) {
+        result = e_LONG;
+        m_state = 2;
+      } else if (m_cnt > SHORT_THRESHOLD) {
+        result = e_SHORT;
+      } else {
+        m_state = 0;
+      }
+      m_cnt = 0;
+      break;
+    case 2:
+      if (getInValue()) {
+        m_cnt++;
+      } else {
+        m_cnt = 0;
+      }
+      if (m_cnt > COOLDOWN_THRESHOLD) {
+        m_state = 0;
+        m_cnt = 0;
+      }
+      break;
+    default:
+      m_state = 0;
+      break;
+    }
+    return result;
+  };
+protected:
+  virtual bool getInValue() =0;
+  uint8_t m_inRegister;
+private:
+  const uint16_t SHORT_THRESHOLD = 100;
+  const uint16_t LONG_THRESHOLD = 300;
+  const uint16_t COOLDOWN_THRESHOLD = 20;
+  uint16_t m_bit;
+  uint8_t m_state;
+  uint16_t m_cnt;
+};
+
+class SwitchPort2 : public SwitchPort {
+public:
+  SwitchPort2(uint16_t bit) : SwitchPort(bit, 2) {
+    P2REN |= bit;
+    P2DIR &= ~bit;
+    P2SEL &= ~bit;
+  };
+protected:
+  virtual bool getInValue() {
+    return P2IN & m_inRegister;
+  };
+};
+class SwitchPort1 : public SwitchPort {
+public:
+  SwitchPort1(uint16_t bit) : SwitchPort(bit, 1) {
+    P1REN |= bit;
+    P1DIR &= ~bit;
+    P1SEL &= ~bit;
+  };
+protected:
+  virtual bool getInValue(uint8_t bit) {
+    return P1IN & m_inRegister;
+  };
+};
+};
+
+SwitchPort intensitySwitch = SwitchPort2(BIT0);
+SwitchPort onTimeSwitch = SwitchPort2(BIT1);
+SwitchPort offTimeSwitch = SwitchPort2(BIT2);
+SwitchPort modeSwitch = SwitchPort2(BIT3);
+
+int16_t intensity = 0;
+uint16_t maxIntensity = 0;
+uint16_t intensityStep = 0;
+const uint16_t intensityStepCnt = 8;
+
+
+void hmiInit() {
+  maxIntensity = engineMaxPwmValue();
+  intensityStep = maxIntensity / intensityStepCnt;
+}
+
+void hmiExec() {
+  if (SwitchPort::e_SHORT == intensitySwitch.get()) {
+    intensity += intensityStep;
+    if (intensity > maxIntensity) {
+      intensity = maxIntensity;
+    } 
+    engineSetPwmValue(intensity);
+  } else if (SwitchPort::e_LONG == intensitySwitch.get()) {
+    intensity -= intensityStep;
+    if (intensity < 0) {
+      intensity = 0;
+    } 
+    engineSetPwmValue(intensity);
+  }
+}
\ No newline at end of file
diff --git a/src/hmi.h b/src/hmi.h
new file mode 100644
index 0000000..644f7d3
--- /dev/null
+++ b/src/hmi.h
@@ -0,0 +1,9 @@
+#ifndef HMI_H_
+#define HMI_H_
+
+
+void hmiInit();
+void hmiExec();
+
+
+#endif /* HMI_H_ */
diff --git a/src/main.cpp b/src/main.cpp
index d6c604c..216e4a5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,7 +10,7 @@
 #include <intrinsics.h>
 #include <isr_compat.h>
 
-#include "time.h"
+#include "engine.h"
 
 
 
@@ -18,7 +18,7 @@ int main() {
   WDTCTL = WDTPW | WDTHOLD;
 
 
-  timeInit();
+  engineInit();
 
 
   __enable_interrupt();
diff --git a/src/switch.cpp b/src/switch.cpp
deleted file mode 100644
index 67bec25..0000000
--- a/src/switch.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-
-/*
-void switch_interrupt() {
-  unsigned long currentEvent = millis();
-
-  if ((lastEvent == 0) || (lastEvent + DEBOUNCING_DEAD_TIME < currentEvent)) {
-    lastEvent = currentEvent;
-
-    switchState = true;
-  }
-}
-
-
-
-bool getAndResetSwitchState() {
-  bool res = false;
-
-  noInterrupts();
-  res = switchState;
-  switchState = false;
-  interrupts();
-
-  return res;
-}
-*/
\ No newline at end of file
diff --git a/src/time.h b/src/time.h
deleted file mode 100644
index 358f5d1..0000000
--- a/src/time.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * time.h
- *
- *  Created on: 17.01.2016
- *      Author: wn
- */
-
-#ifndef TIME_H_
-#define TIME_H_
-
-
-
-void timeInit();
-uint32_t ticks();
-
-
-
-
-#endif /* TIME_H_ */