diff --git a/firmware/include/app.h b/firmware/include/app.h
index cf2353a..b73b3c8 100644
--- a/firmware/include/app.h
+++ b/firmware/include/app.h
@@ -22,4 +22,10 @@ struct FFTTestApp: public App {
     void init();
     void deinit();
     void loop();
+};
+
+struct FackelApp: public App {
+    void init();
+    void deinit();
+    void loop();
 };
\ No newline at end of file
diff --git a/firmware/src/applications/fackel.cpp b/firmware/src/applications/fackel.cpp
new file mode 100644
index 0000000..e852760
--- /dev/null
+++ b/firmware/src/applications/fackel.cpp
@@ -0,0 +1,146 @@
+#include "app.h"
+#include "pt1.h"
+#include "zauberstab.h"
+#include <cstdlib>
+
+static unsigned long last_sample_time;
+static unsigned long sample_counter;
+static float rms_avg;
+
+static uint8_t energy[NUM_LEDS];
+static uint8_t spark_energy[NUM_LEDS];
+
+Pt1<float> energy_pt1{1.f, 1.f};
+CRGB palette[128];
+
+static void hsl_to_rgb(uint32_t hue, uint32_t sat, uint32_t lum, uint8_t *r, uint8_t *g, uint8_t *b)
+{
+    uint32_t v;
+
+    v = (lum < 128) ? (lum * (256 + sat)) >> 8 : (((lum + sat) << 8) - lum * sat) >> 8;
+
+    if (v <= 0)
+    {
+        *r = *g = *b = 0;
+    }
+    else
+    {
+        int32_t m;
+        int32_t sextant;
+        int32_t fract, vsf, mid1, mid2;
+
+        m = lum + lum - v;
+        hue *= 6;
+        sextant = hue >> 8;
+        fract = hue - (sextant << 8);
+        vsf = v * fract * (v - m) / v >> 8;
+        mid1 = m + vsf;
+        mid2 = v - vsf;
+        switch (sextant)
+        {
+        case 0:
+            *r = v;
+            *g = mid1;
+            *b = m;
+            break;
+        case 1:
+            *r = mid2;
+            *g = v;
+            *b = m;
+            break;
+        case 2:
+            *r = m;
+            *g = v;
+            *b = mid1;
+            break;
+        case 3:
+            *r = m;
+            *g = mid2;
+            *b = v;
+            break;
+        case 4:
+            *r = mid1;
+            *g = m;
+            *b = v;
+            break;
+        case 5:
+            *r = v;
+            *g = m;
+            *b = mid2;
+            break;
+        }
+    }
+}
+
+static void update_engery(uint8_t *energy, size_t s)
+{
+    for (int i = s; i >= 2; i--)
+    {
+        energy[i] = (uint8_t)((float)(energy[i - 1] + energy[i - 2]) * 0.485f);
+    }
+}
+
+void FackelApp::init()
+{
+    memset(&energy, 0, NUM_LEDS);
+    memset(&spark_energy, 0, NUM_LEDS);
+
+    // generate palette
+    for (int i = 0; i < 128; i++)
+    {
+        uint8_t r, g, b;
+        hsl_to_rgb(i / 5, 255, i * 2 > 128 ? 128 : i * 2, &r, &g, &b);
+        g = g == 1 ? 0 : g;
+        b = b == 1 ? 0 : b;
+        palette[i].r = r;
+        palette[i].g = g;
+        palette[i].b = b;
+    }
+}
+
+void FackelApp::deinit()
+{
+}
+
+void FackelApp::loop()
+{
+    if (micros() - last_sample_time >= 500)
+    {
+        last_sample_time = micros();
+        int32_t sample = get_sample();
+        float in = sample * sample;
+        sample_counter++;
+        rms_avg += (in - rms_avg) / (sample_counter + 1);
+    }
+
+    EVERY_N_MILLISECONDS(10)
+    {
+        float e_f = energy_pt1.update(rms_avg, 0.01f);
+
+        if (rms_avg > 1.15 * e_f)
+        {
+            energy[0] = 128;
+            energy[1] = 128;
+        }
+        else
+        {
+            energy[0] = 50;
+            energy[1] = 50;
+        }
+
+        rms_avg = 0.0f;
+        sample_counter = 0;
+    }
+
+    EVERY_N_MILLISECONDS(45)
+    {
+        update_engery(energy, NUM_LEDS);
+
+        for (int i = 0; i < NUM_LEDS; i++)
+        {
+            leds[i] = palette[energy[i]];
+        }
+
+        FastLED.show();
+    }
+}
\ No newline at end of file
diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index ed6e54d..e6fa42d 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -1,18 +1,28 @@
+#include "app.h"
+#include "driver/adc.h"
 #include "zauberstab.h"
 #include <vector>
-#include "app.h"
 
-struct BeatDetectApp beat_detect_app{};
-struct VuMeterApp vu_meter_app {};
-struct FFTTestApp fft_test_app {};
+struct BeatDetectApp beat_detect_app
+{
+};
+struct VuMeterApp vu_meter_app
+{
+};
+struct FFTTestApp fft_test_app
+{
+};
+struct FackelApp fackel_app
+{
+};
 
 std::vector<std::reference_wrapper<App>> apps = {
     std::ref<App>(beat_detect_app),
     std::ref<App>(vu_meter_app),
     std::ref<App>(fft_test_app),
-};
+    std::ref<App>(fackel_app)};
 
-unsigned int current_app = 0;
+unsigned int current_app = 3;
 unsigned int next_app;
 
 void setup()
@@ -26,7 +36,14 @@ void setup()
 
 void loop()
 {
-    if (next_app != current_app) {
+/*     EVERY_N_SECONDS(30)
+    {
+        next_app++;
+        next_app = next_app % apps.size();
+    } */
+
+    if (next_app != current_app)
+    {
         apps[current_app].get().deinit();
         apps[next_app].get().init();
         current_app = next_app;