diff --git a/src/counter.c b/src/counter.c
index 0fdd859..04cdad3 100644
--- a/src/counter.c
+++ b/src/counter.c
@@ -29,6 +29,7 @@ void isr() {
   lastCounter = currentCounter;
 
   ringbufferPut(diff);
+  led(E_GREEN, true);
 }
 
 void init() {
@@ -65,13 +66,20 @@ int main (void) {
   influxInit(&cfg);
   start();
 
-  
+
+  uint32_t ledTick = 0;  
   while (1) {
     uint32_t diff = ringbufferGet();
   
     double f = 1.0 / (((double) diff) / 1000000.0);
 //    printf("%f\n", f);
     influxAddFrequency(f);
+
+    ledTick++;
+    if (ledTick == 100) {
+      ledTick = 0;
+      led(E_GREEN, false);
+    }
   }
 
   // will never be reached
diff --git a/src/influx.c b/src/influx.c
index 73ba16a..1b7fe5c 100644
--- a/src/influx.c
+++ b/src/influx.c
@@ -6,6 +6,8 @@
 #include <unistd.h>
 #include <libconfig.h>
 
+#include "led.h"
+
 
 const char INFLUXURL_KEY[] = "influxUrl";
 const char DEFAULT_INFLUXURL[] = "http://172.16.3.15:8086/write?db=smarthome2&precision=ms";
@@ -53,6 +55,8 @@ void influxInit(config_t *pCfg) {
 
 
 static void influxSendRequest() {
+    led(E_RED, false);
+    led(E_BLUE, true);
     CURL *curl = curl_easy_init();
     if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, influxUrl);
@@ -65,9 +69,11 @@ static void influxSendRequest() {
         CURLcode res = curl_easy_perform(curl);
         if(res != CURLE_OK) {
             fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+            led(E_RED, true);
         }
         curl_easy_cleanup(curl);
     }
+    led(E_BLUE, false);
 }
 
 void influxAddFrequency(double f) {
diff --git a/src/led.c b/src/led.c
index 901a107..1c4db3b 100644
--- a/src/led.c
+++ b/src/led.c
@@ -22,5 +22,11 @@ void ledInit() {
 
 
 void led (tColor color, bool state) {
-
+    if (color == E_RED) {
+        digitalWrite(RED_OUT, state ? 1 : 0);
+    } elif (color = E_BLUE) {
+        digitalWrite(BLUE_OUT, state ? 1 : 0);
+    } elif (color = E_GREEN) {
+        digitalWrite(GREEN_OUT, state ? 1 : 0);
+    }
 }
\ No newline at end of file