diff --git a/platformio.ini b/platformio.ini
index 33c978d..6d54397 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -17,6 +17,8 @@ build_src_filter =
     -<.git/>
     -<.svn/>
     -<blink/>
-    -<button_interrupt/>
+    -<button_interupt/>
     -<button_poll/>
-    -<trafficlight/>
\ No newline at end of file
+    -<trafficlight/>
+    -<summer/>
+    +<summer_controlled/>
\ No newline at end of file
diff --git a/src/button_interupt/button.cpp b/src/button_interupt/button.cpp
index f32fa2a..06d55a9 100644
--- a/src/button_interupt/button.cpp
+++ b/src/button_interupt/button.cpp
@@ -4,8 +4,6 @@
 
 #include "button.h"
 
-#ifdef BUTTON_INTERRUPT
-
 ISR(INT0_vect)
 {
     PORTB = 0;
@@ -43,5 +41,3 @@ void init() {
 void loop() {
 
 }
-
-#endif
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index e7eb02c..eb39cf2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,7 +6,8 @@ extern void loop();
 //#include "button_poll/button.h"
 //#include "button_interupt/button.h"
 //#include "trafficlight/trafficlight.h"
-#include "summer/summer.h"
+//#include "summer/summer.h"
+#include "summer_controlled/summer.h"
 
 int main() {
     init();
diff --git a/src/summer/summer.cpp b/src/summer/summer.cpp
index 12e18a7..145bf9b 100644
--- a/src/summer/summer.cpp
+++ b/src/summer/summer.cpp
@@ -15,13 +15,14 @@ void init() {
 
     TCCR0A |= (1 << WGM01);   // set timer to CTC
 
-    OCR0A = 0x70; // count up to this value
+    OCR0A = 0x70; // count up to this value 440Hz
+//    OCR0A = 0x117; // count up to this value 265Hz
 
     TIMSK0 |= (1 << OCIE0A);  // enable timer 0
 
-    sei();  // enable interrupts
+    TCCR0B |= (1 << CS02) | (1 << CS00);    // start timer and set prescaler to 1024
 
-    TCCR0B |= (1 << CS02);    // start timer and set prescaler to 256
+    sei();  // enable interrupts
 }
 
 void loop() {
diff --git a/src/summer_controlled/summer.cpp b/src/summer_controlled/summer.cpp
new file mode 100644
index 0000000..5b73f61
--- /dev/null
+++ b/src/summer_controlled/summer.cpp
@@ -0,0 +1,65 @@
+//
+// Created by servostar on 30.10.23.
+//
+
+#include "summer.h"
+
+void setup_summer_it();
+
+void setup_button_it();
+
+ISR (TIMER0_COMPA_vect)
+{
+    PORTB = ~PORTB;
+}
+
+ISR(INT0_vect)
+{
+    OCR0A = 18; // count up to this value 440Hz
+}
+
+ISR(INT1_vect)
+{
+    OCR0A = 30; // count up to this value 265Hz
+}
+
+void init() {
+    setup_summer_it();
+    setup_button_it();
+    sei();  // enable interrupts
+}
+
+void setup_button_it() {
+    // set Port D to input (bit 2/3, remember bit 0/1 are for UART)
+    SET_INPUT(DDRD, DDD2);
+    SET_INPUT(DDRD, DDD3);
+    // put 5V on input (make it pull up resistor)
+    SET_BIT(PORTD, DDD2);
+    SET_BIT(PORTD, DDD3);
+
+    // configure interrupt mode
+    SET_INTERRUPT_MODE(0, FALLING);
+    SET_INTERRUPT_MODE(1, FALLING);
+
+    // enable interrupt 0 and 1
+    ENABLE_INTERRUPT(0);
+    ENABLE_INTERRUPT(1);
+}
+
+void setup_summer_it() {
+    DDRB = 255;
+    PORTB = 0;
+
+    TCCR0A |= (1 << WGM01);   // set timer to CTC
+
+    OCR0A = 0x70; // count up to this value 440Hz
+//    OCR0A = 0x117; // count up to this value 265Hz
+
+    TIMSK0 |= (1 << OCIE0A);  // enable timer 0
+
+    TCCR0B |= (1 << CS02) | (1 << CS00);    // start timer and set prescaler to 1024
+}
+
+void loop() {
+
+}
diff --git a/src/summer_controlled/summer.h b/src/summer_controlled/summer.h
new file mode 100644
index 0000000..4d2f081
--- /dev/null
+++ b/src/summer_controlled/summer.h
@@ -0,0 +1,13 @@
+//
+// Created by servostar on 30.10.23.
+//
+
+#ifndef ARDUINO_SUMMER_H
+#define ARDUINO_SUMMER_H
+
+#include "prelude.h"
+
+void init();
+void loop();
+
+#endif //ARDUINO_SUMMER_H