diff --git a/Makefile b/Makefile
index 9b26a76..5981e88 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ F_CPU = 16000000UL
 MCU = atmega328p
 
 CFLAGS += -DF_CPU=$(F_CPU) -mmcu=$(MCU)
-CFLAGS += -I. -O2 --std=c99
+CFLAGS += -I. -O2 --std=c11
 CFLAGS += -ffunction-sections -fdata-sections
 
 LDFLAGS += -s -mmcu=$(MCU)
diff --git a/contr.c b/contr.c
index be3385c..bb6f6d0 100644
--- a/contr.c
+++ b/contr.c
@@ -31,11 +31,7 @@
 
 typedef struct {
     uint8_t band;
-    bool button_was_pressed;
-    uint16_t button_time_counter;
-    uint16_t button_time_untap;
-    uint16_t button_tap_counter;
-    bool button_strokes_ended;
+    uint16_t vcc;
 } contr_t;
 
 contr_t contr;
@@ -57,6 +53,17 @@ void contr_setup(void) {
     contr_read_band();
 }
 
+void contr_measure_vcc() {
+    contr.vcc = adc_read(ACD_CHANELL3);
+}
+
+
+#define CONTR_VCC_SCALE 2700.0F
+float contr_get_vcc() {
+    return (float)contr.vcc / CONTR_VCC_SCALE;
+}
+
+
 void contr_switch_band(void) {
     switch (contr.band) {
     case CONTR_BAND_10M:
@@ -157,12 +164,20 @@ void contr_show_band(void) {
     disp_string(0, 12, contr_get_bandname(contr.band));
 }
 
+void contr_show_vcc(void) {
+    char buffer[12] = { '\0' };
+    sprintf(buffer, "#%4.1fV", contr_get_vcc());
+    disp_string(0, 0, buffer);
+}
+
+
 void contr_main(void) {
     contr_show_logo();
-
     uint16_t counter = 0;
     while (true) {
         contr_button_eval();
+        contr_measure_vcc();
+        contr_show_vcc();
         contr_show_band();
         counter++;
         _delay_ms(100);
diff --git a/main.c b/main.c
index 415a014..e65f317 100644
--- a/main.c
+++ b/main.c
@@ -37,7 +37,9 @@ int main(void) {
     relay80m_init();
     buzzer_init();
     fan_init();
+
     button_init();
+    button_reset();
 
     relaytx_off();
     atten_off();