diff --git a/src/main/CMakeLists.txt b/src/main/CMakeLists.txt
index 84f3e82..99f6ef2 100644
--- a/src/main/CMakeLists.txt
+++ b/src/main/CMakeLists.txt
@@ -1,5 +1,5 @@
 idf_component_register(SRCS "app_main.c"
                             "network_mngr.c"
                             "gpio.c"
-                            "timer.c"
+                            "counter.c"
                     INCLUDE_DIRS ".")
diff --git a/src/main/app_main.c b/src/main/app_main.c
index 064b4cd..4727a85 100644
--- a/src/main/app_main.c
+++ b/src/main/app_main.c
@@ -14,7 +14,7 @@
 #include <nvs_flash.h>
 
 #include "gpio.h"
-#include "timer.h"
+#include "counter.h"
 
 
 
@@ -39,7 +39,7 @@ void app_main(void)
     gpioInit();
     networkInit(isGpioForceProv());
 
-    timerInit();
+    counterInit();
 
     /* Start main application now */
     while (1) {
diff --git a/src/main/counter.c b/src/main/counter.c
new file mode 100644
index 0000000..b4ede93
--- /dev/null
+++ b/src/main/counter.c
@@ -0,0 +1,70 @@
+#include <stdint.h>
+
+#include "timer.h"
+
+#include <driver/timer.h>
+#include <esp_log.h>
+#include <esp_types.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/queue.h>
+
+static const char *TAG = "cnt";
+
+
+static xQueueHandle zeroCrossingQueue = NULL;
+static const uint64_t QUEUE_MARKER = UINT64_MAX;
+
+
+static void counterTask(void *arg) {
+    while (1) {
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+        xQueueSend(zeroCrossingQueue, QUEUE_MARKER, portMAX_DELAY);
+    }
+}
+
+static void counterZeroCrossingAveragerTask(void *arg) {
+    uint64_t counterCnt = 0;
+    uint64_t counterSum = 0;
+    while (1) {
+        uint64_t counterCurrentValue;
+        xQueueReceive(zeroCrossingQueue, &counterCurrentValue, portMAX_DELAY);
+        if (counterCurrentValue == QUEUE_MARKER) {
+            uint32_t counterSecondAverage = ((uint32_t)(counterSum)) / ((uint32_t)(counterCnt));
+            ESP_LOGI(TAG, "second average is %lu", counterSecondAverage);
+        } else {
+            counterSum += 1;
+            counterCnt += counterValue;
+        }
+    }
+}
+
+void IRAM_ATTR counterZeroCrossingISR(void *arg) {
+    uint64_t counterValue = 0;
+    
+    timer_spinlock_take(TIMER_GROUP_0);
+    counterValue = time_group_get_counter_value_in_isr(TIMER_GROUP_0, 0);
+    timer_spinlock_give(TIMER_GROUP_0);
+
+    if (zeroCrossingQueue) {
+        xQueueSendFromISR(zeroCrossingQueue, counterValue, NULL);
+    }
+}
+
+void counterInit() {
+    timer_config_t config = {
+        .divider = 80,
+        .counter_dir = TIMER_COUNT_UP,
+        .counter_en = TIMER_PAUSE,
+        .alarm_en = TIMER_ALARM_DIS,
+        .auto_reload = TIMER_AUTORELOAD_EN
+    };
+    timer_init(TIMER_GROUP_0, 0, &config);
+    timer_set_counter_value(TIMER_GROUP_0, 0, 0);
+    timer_start(TIMER_GROUP_0, 0);
+
+    zeroCrossingQueue = xQueueCreate(20, sizeof(uint64_t));
+
+    xTaskCreate(counterSecondTask, "counter_second_task", 2048, NULL, 5, NULL);
+    xTaskCreate(counterZeroCrossingAveragerTask, "counter_averager_task", 2048, NULL, 5, NULL);
+}
diff --git a/src/main/counter.h b/src/main/counter.h
new file mode 100644
index 0000000..88346a8
--- /dev/null
+++ b/src/main/counter.h
@@ -0,0 +1,12 @@
+#ifndef _COUNTER_H_
+#define _COUNTER_H_
+
+
+
+
+
+void counterInit();
+void counterZeroCrossingISR(void *arg);
+
+
+#endif // _COUNTER_H_
\ No newline at end of file
diff --git a/src/main/gpio.c b/src/main/gpio.c
index 3e3bed8..b3416b8 100644
--- a/src/main/gpio.c
+++ b/src/main/gpio.c
@@ -1,6 +1,7 @@
 #include <stdbool.h>
 
 #include "gpio.h"
+#include "counter.h"
 
 #include <driver/gpio.h>
 #include <esp_log.h>
@@ -17,6 +18,15 @@ void gpioInit() {
     io_conf.pull_down_en = 1;
     gpio_config(&io_conf);
 
+    io_conf.intr_type = GPIO_INTR_POSEDGE;
+    io_conf.pin_bit_mask = (1ULL << GPIO_ZERO_CROSSING);
+    io_conf.mode = GPIO_MODE_INPUT;
+    io_conf.pull_up_en = 0;
+    io_conf.pull_down_en = 0;
+    gpio_config(&i_conf);
+
+    gpio_isr_handler_add(GPIO_ZERO_CROSSING, counterZeroCrossingISR, NULL);
+
     ESP_LOGI(TAG, "gpios configured");
 }
 
diff --git a/src/main/gpio.h b/src/main/gpio.h
index 09b5800..378194c 100644
--- a/src/main/gpio.h
+++ b/src/main/gpio.h
@@ -5,7 +5,7 @@
 
 
 #define GPIO_FORCE_PROV 5
-
+#define GPIO_ZERO_CROSSING 26
 
 void gpioInit();
 bool isGpioForceProv();
diff --git a/src/main/timer.c b/src/main/timer.c
deleted file mode 100644
index b22fe61..0000000
--- a/src/main/timer.c
+++ /dev/null
@@ -1,38 +0,0 @@
-#include <stdint.h>
-
-#include "timer.h"
-
-#include <driver/timer.h>
-#include <esp_log.h>
-#include <esp_types.h>
-#include <freertos/FreeRTOS.h>
-#include <freertos/task.h>
-#include <freertos/queue.h>
-
-static const char *TAG = "tm";
-
-
-
-static void timer_task(void *arg) {
-    while (1) {
-        uint64_t counterValue;
-        timer_get_counter_value(TIMER_GROUP_0, 0, &counterValue);
-        ESP_LOGI(TAG, "timer value: %08x %08x", (uint32_t)(counterValue >> 32), (uint32_t)(counterValue));
-        vTaskDelay(1000 / portTICK_PERIOD_MS);
-    }
-}
-
-void timerInit() {
-    timer_config_t config = {
-        .divider = 80,
-        .counter_dir = TIMER_COUNT_UP,
-        .counter_en = TIMER_PAUSE,
-        .alarm_en = TIMER_ALARM_DIS,
-        .auto_reload = TIMER_AUTORELOAD_EN
-    };
-    timer_init(TIMER_GROUP_0, 0, &config);
-    timer_set_counter_value(TIMER_GROUP_0, 0, 0);
-    timer_start(TIMER_GROUP_0, 0);
-
-    xTaskCreate(timer_task, "timer_task", 2048, NULL, 5, NULL);
-}
diff --git a/src/main/timer.h b/src/main/timer.h
deleted file mode 100644
index ecc23e8..0000000
--- a/src/main/timer.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef _PCNT_H_
-#define _PCNT_H_
-
-void timerInit();
-
-
-
-#endif // _PCNT_H_
\ No newline at end of file