diff --git a/led/led_sardine.c b/led/led_sardine.c
new file mode 100644
index 0000000..a53729f
--- /dev/null
+++ b/led/led_sardine.c
@@ -0,0 +1,63 @@
+#include <hardware/led.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+
+const char* const CADENCE_FILE = "/sys/class/leds/left/cadence";
+const char* const COLOR_FILE = "/sys/class/leds/left/color";
+const char* const BT_WIFI_FILE = "/sys/class/leds/right/brightness";
+
+static int
+write_string(const char* file, const char* string, int len)
+{
+    int fd;
+    ssize_t amt;
+
+    fd = open(file, O_RDWR);
+    if (fd < 0) {
+        return errno;
+    }
+
+    amt = write(fd, string, len+1);
+
+    close(fd);
+    return amt >= 0 ? 0 : errno;
+}
+
+int set_led_state(unsigned colorARGB, int onMS, int offMS)
+{
+    int len;
+    char buf[30];
+    int red, green, color;
+
+    // alpha of 0 or color of 0 (ignoring blue) means off
+    if ((colorARGB & 0xff000000) == 0 || (colorARGB & 0x00ffff00) == 0) {
+        onMS = 0;
+        offMS = 0;
+    }
+
+    // blue means green
+    if ((colorARGB & 0x00ffff00) == 0 && (colorARGB & 0x000000ff) != 0) {
+        colorARGB |= (colorARGB & 0x000000ff) << 8;
+    }
+
+    // ===== color =====
+    // this color conversion isn't really correct, but it's better to
+    // have the light come bright on when asked for low intensity than to
+    // not come on at all. we have no blue
+    red = (colorARGB & 0x00ff0000) ? 1 : 0;
+    green = (colorARGB & 0x0000ff00) ? 2 : 0;
+    color = (red | green) - 1;
+
+    len = sprintf(buf, "%d", color);
+    write_string(COLOR_FILE, buf, len);
+
+    // ===== color =====
+    len = sprintf(buf, "%d,%d", onMS, offMS);
+    write_string(CADENCE_FILE, buf, len);
+
+    return 0;
+}