diff --git a/pio/ws2812/ws2812.c b/pio/ws2812/ws2812.c
index fff4792d5..aa8eb4fc8 100644
--- a/pio/ws2812/ws2812.c
+++ b/pio/ws2812/ws2812.c
@@ -17,15 +17,19 @@
  *  Take into consideration if your WS2812 is a RGB or RGBW variant.
  *
  *  If it is RGBW, you need to set IS_RGBW to true and provide 4 bytes per 
- *  pixel (Red, Green, Blue, White) and use urgbw_u32().
+ *  pixel (Red, Green, Blue, White) and use urgb_u32() or urgbw_u32().
  *
  *  If it is RGB, set IS_RGBW to false and provide 3 bytes per pixel (Red,
  *  Green, Blue) and use urgb_u32().
  *
  *  When RGBW is used with urgb_u32(), the White channel will be ignored (off).
  *
+ * Some strips only support 400Khz.
+ *
+ * Set IS_800KHz to false if your strip is like that.
  */
 #define IS_RGBW false
+#define IS_800KHz true
 #define NUM_PIXELS 150
 
 #ifdef PICO_DEFAULT_WS2812_PIN
@@ -40,6 +44,7 @@
 #error Attempting to use a pin>=32 on a platform that does not support it
 #endif
 
+#ifndef IS_RGBW
 static inline void put_pixel(PIO pio, uint sm, uint32_t pixel_grb) {
     pio_sm_put_blocking(pio, sm, pixel_grb << 8u);
 }
@@ -50,14 +55,32 @@ static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) {
             ((uint32_t) (g) << 16) |
             (uint32_t) (b);
 }
+#else
+static inline void put_pixel(PIO pio, uint sm, uint32_t pixel_grb) {
+    pio_sm_put_blocking(pio, sm, pixel_grb);
+}
 
-static inline uint32_t urgbw_u32(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
+static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) {
+    return
+            ((uint32_t) (r) << 8) |
+            ((uint32_t) (g) << 16) |
+            (uint32_t) (b);
+}
+
+/*
+ * NOTE: 
+ * This code here is unused in this example, however can be useful if you want to set the white brightness too.
+ * Keeping it here for later reference.
+ * You may remove __attribute__((unused)) in case you use it.
+ */
+static inline uint32_t __attribute__((unused)) urgbw_u32(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
     return
             ((uint32_t) (r) << 8) |
             ((uint32_t) (g) << 16) |
             ((uint32_t) (w) << 24) |
             (uint32_t) (b);
 }
+#endif
 
 void pattern_snakes(PIO pio, uint sm, uint len, uint t) {
     for (uint i = 0; i < len; ++i) {
@@ -91,7 +114,7 @@ void pattern_greys(PIO pio, uint sm, uint len, uint t) {
     uint max = 100; // let's not draw too much current!
     t %= max;
     for (uint i = 0; i < len; ++i) {
-        put_pixel(pio, sm, t * 0x10101);
+        put_pixel(pio, sm, t * 0x1010101);
         if (++t >= max) t = 0;
     }
 }
@@ -108,11 +131,9 @@ const struct {
 };
 
 int main() {
-    //set_sys_clock_48();
     stdio_init_all();
     printf("WS2812 Smoke Test, using pin %d\n", WS2812_PIN);
 
-    // todo get free sm
     PIO pio;
     uint sm;
     uint offset;
@@ -123,7 +144,11 @@ int main() {
     bool success = pio_claim_free_sm_and_add_program_for_gpio_range(&ws2812_program, &pio, &sm, &offset, WS2812_PIN, 1, true);
     hard_assert(success);
 
+#if IS_800KHz
     ws2812_program_init(pio, sm, offset, WS2812_PIN, 800000, IS_RGBW);
+#else
+    ws2812_program_init(pio, sm, offset, WS2812_PIN, 400000, IS_RGBW);
+#endif
 
     int t = 0;
     while (1) {