diff --git a/firmware/lux.cpp b/firmware/lux.cpp
index 8b775c4..eb7b9ad 100644
--- a/firmware/lux.cpp
+++ b/firmware/lux.cpp
@@ -9,6 +9,7 @@
 #include <task.h>
 
 #include <esp/spi.h>
+#include <ws2812_i2s/ws2812_i2s.h>
 
 const int signal_led_pin = 2;
 
@@ -16,17 +17,89 @@ const int cs0 = 15;
 const int gpio4 = 4;
 const int gpio5 = 5;
 
+
+ws2812_pixel_t **pixels_ptr;
+
+static ws2812_pixel_t next_colour(int i) {
+    ws2812_pixel_t colour = {{0, 0, 0, 0}};
+    if(i == 8) {
+        colour.white = 32;
+    } else {
+        colour.red = i & 1 ? 32 : 0;
+        colour.green = i & 2 ? 32 : 0;
+        colour.blue = i & 4 ? 32 : 0;
+    }
+
+    return colour;
+}
+
+void spi_dac(int id, int val) {
+    int dac_val = (val << 2) & 0x3FFC;
+
+    spi_transfer_8(1, ~(0x00));
+    gpio_write(cs0, 1);
+    gpio_write(cs0, 0);
+    spi_transfer_8(1, ~(0x01 << id));
+    gpio_write(cs0, 1);
+    gpio_write(cs0, 0);
+
+    spi_transfer_16(1, dac_val);
+
+    spi_transfer_8(1, ~(0x00));
+    gpio_write(cs0, 1);
+    gpio_write(cs0, 0);
+    spi_transfer_8(1, ~(0x01 << id));
+    gpio_write(cs0, 1);
+    gpio_write(cs0, 0);
+}
+
 extern "C" void signal_led(bool state) {
     gpio_write(signal_led_pin, !state);
 }
 
+
+/* This task uses the high level GPIO API (esp_gpio.h) to blink an LED.
+ *
+ */
 extern "C" void lux_task(void *pvParameters) {
 
+    gpio_enable(9, GPIO_INPUT);
+    gpio_enable(10, GPIO_INPUT);
+
+    ws2812_pixel_t pixels[led_number];
+    ws2812_i2s_init(led_number, PIXEL_RGBW);
+    memset(pixels, 0, sizeof(ws2812_pixel_t) * led_number);
+
     gpio_enable(signal_led_pin, GPIO_OUTPUT);
     gpio_enable(cs0, GPIO_OUTPUT);
     gpio_enable(gpio4, GPIO_OUTPUT);
     gpio_enable(gpio5, GPIO_OUTPUT);
     spi_init(1, SPI_MODE0, SPI_FREQ_DIV_1M, 1, SPI_BIG_ENDIAN, 1);
+    while (1) {
+        gpio_write(gpio4, 1);
+        vTaskDelay(200 / portTICK_PERIOD_MS);
+        gpio_write(gpio4, 0);
+        /*for (int j = 0; j < 64; j++) {
+            for (int i = 0; i < 8; i++)
+                spi_dac(i, 64 * j);
+            //printf("> %d\n", 64*j);
+            vTaskDelay(100 / portTICK_PERIOD_MS);
+        }*/
+        for (int i = 0; i < 8; i++)
+            spi_dac(i, 0);
 
-    vTaskDelete(nullptr);
+        gpio_write(gpio5, 1);
+        vTaskDelay(200 / portTICK_PERIOD_MS);
+        gpio_write(gpio5, 0);
+
+        for (int c = 8; c >= 0; c--) {
+
+            for (int i = 0; i < led_number; i++) {
+                pixels[i] = next_colour(c);
+            }
+            ws2812_i2s_update(pixels, PIXEL_RGBW);
+            vTaskDelay(200 / portTICK_PERIOD_MS);
+        }
+
+    }
 }
\ No newline at end of file
diff --git a/firmware/lux.h b/firmware/lux.h
index caf4a88..d29f45e 100644
--- a/firmware/lux.h
+++ b/firmware/lux.h
@@ -5,6 +5,10 @@
 #ifndef FIRMWARE_LUX_H
 #define FIRMWARE_LUX_H
 
+#ifdef __cplusplus
+constexpr int led_number = 8;
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif