diff --git a/Production/Firmware/aic_pico.uf2 b/Production/Firmware/aic_pico.uf2
index b6557ce..70a2141 100644
Binary files a/Production/Firmware/aic_pico.uf2 and b/Production/Firmware/aic_pico.uf2 differ
diff --git a/README.md b/README.md
index b732fbf..e9143b2 100644
--- a/README.md
+++ b/README.md
@@ -95,7 +95,7 @@ I'll let these images do the talk.
 <img src="doc/pico_assemble_4.jpg" width="40%">
 
 #### Notes
-* The firmware supports up to 16 LEDs on the WS2812B LED strip. I personally used 3 as shown in main title image. But you can experiment with different LED numbers, as long as they fit within the housing.
+* The firmware supports up to 64 LEDs on the WS2812B LED strip. I personally used 3 as shown in main title image. But you can have different LED number, as long as they fit within the housing.
 * LED might be excessively bright even at low settings, consider covering it with some filter tape.
 * The mode switch on PN532 must be in "I2C" mode, picture below shows the correct settings.  
   <img src="doc/pn532_i2c.jpg" width="40%">
diff --git a/firmware/src/light.c b/firmware/src/light.c
index c7f5cac..9c5c79d 100644
--- a/firmware/src/light.c
+++ b/firmware/src/light.c
@@ -21,7 +21,7 @@
 #include "board_defs.h"
 #include "config.h"
 
-static uint32_t rgb_buf[16];
+static uint32_t rgb_buf[64];
 static uint8_t led_gpio[] = LED_DEF;
 #define RGB_NUM (sizeof(rgb_buf) / sizeof(rgb_buf[0]))
 #define LED_NUM (sizeof(led_gpio))
diff --git a/firmware/src/main.c b/firmware/src/main.c
index 2b0bc56..623d788 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -103,7 +103,7 @@ static void core1_loop()
             mutex_exit(&core1_io_lock);
         }
         cli_fps_count(1);
-        sleep_ms(1);
+        sleep_us(500);
     }
 }