diff --git a/applications/lfrfid-debug/scene/lfrfid-debug-app-scene-tune.cpp b/applications/lfrfid-debug/scene/lfrfid-debug-app-scene-tune.cpp
index fea0e586..89cc2792 100644
--- a/applications/lfrfid-debug/scene/lfrfid-debug-app-scene-tune.cpp
+++ b/applications/lfrfid-debug/scene/lfrfid-debug-app-scene-tune.cpp
@@ -1,7 +1,35 @@
 #include "lfrfid-debug-app-scene-tune.h"
+#include <furi-hal.h>
+
+extern COMP_HandleTypeDef hcomp1;
+
+static void comparator_trigger_callback(void* hcomp, void* comp_ctx) {
+    COMP_HandleTypeDef* _hcomp = static_cast<COMP_HandleTypeDef*>(hcomp);
+
+    if(hcomp == &hcomp1) {
+        hal_gpio_write(&gpio_ext_pa7, HAL_COMP_GetOutputLevel(_hcomp) == COMP_OUTPUT_LEVEL_HIGH);
+    }
+}
 
 void LfRfidDebugAppSceneTune::on_enter(LfRfidDebugApp* app, bool need_restore) {
     app->view_controller.switch_to<LfRfidViewTuneVM>();
+    hal_gpio_init_simple(&gpio_ext_pa7, GpioModeOutputPushPull);
+
+    api_interrupt_add(comparator_trigger_callback, InterruptTypeComparatorTrigger, this);
+
+    hcomp1.Init.InputMinus = COMP_INPUT_MINUS_1_2VREFINT;
+    hcomp1.Init.InputPlus = COMP_INPUT_PLUS_IO1;
+    hcomp1.Init.OutputPol = COMP_OUTPUTPOL_NONINVERTED;
+    hcomp1.Init.Hysteresis = COMP_HYSTERESIS_HIGH;
+    hcomp1.Init.BlankingSrce = COMP_BLANKINGSRC_NONE;
+    hcomp1.Init.Mode = COMP_POWERMODE_MEDIUMSPEED;
+    hcomp1.Init.WindowMode = COMP_WINDOWMODE_DISABLE;
+    hcomp1.Init.TriggerMode = COMP_TRIGGERMODE_IT_RISING_FALLING;
+    if(HAL_COMP_Init(&hcomp1) != HAL_OK) {
+        Error_Handler();
+    }
+
+    HAL_COMP_Start(&hcomp1);
 
     furi_hal_rfid_pins_read();
     furi_hal_rfid_tim_read(125000, 0.5);
@@ -22,6 +50,10 @@ bool LfRfidDebugAppSceneTune::on_event(LfRfidDebugApp* app, LfRfidDebugApp::Even
 }
 
 void LfRfidDebugAppSceneTune::on_exit(LfRfidDebugApp* app) {
+    HAL_COMP_Stop(&hcomp1);
+    api_interrupt_remove(comparator_trigger_callback, InterruptTypeComparatorTrigger);
+
+    hal_gpio_init_simple(&gpio_ext_pa7, GpioModeAnalog);
     furi_hal_rfid_tim_read_stop();
     furi_hal_rfid_tim_reset();
     furi_hal_rfid_pins_reset();