diff --git a/fido2/main.c b/fido2/main.c
index 2b304ea..3f751e7 100644
--- a/fido2/main.c
+++ b/fido2/main.c
@@ -78,7 +78,7 @@ int main(int argc, char * argv[])
 
     while(1)
     {
-        if (millis() - t1 > 100)
+        if (millis() - t1 > HEARTBEAT_PERIOD)
         {
             heartbeat();
             t1 = millis();
diff --git a/targets/stm32l442/bootloader/bootloader.c b/targets/stm32l442/bootloader/bootloader.c
index 10ec7c1..4715b4a 100644
--- a/targets/stm32l442/bootloader/bootloader.c
+++ b/targets/stm32l442/bootloader/bootloader.c
@@ -143,7 +143,10 @@ int bootloader_bridge(uint8_t klen, uint8_t * keyh)
 void bootloader_heartbeat()
 {
     static int state = 0;
-    static uint32_t val = 0x10;
+    static uint32_t val = (LED_MAX_SCALER - LED_MIN_SCALER)/2;
+    uint8_t r = (LED_INIT_VALUE >> 16) & 0xff;
+    uint8_t g = (LED_INIT_VALUE >> 8) & 0xff;
+    uint8_t b = (LED_INIT_VALUE >> 0) & 0xff;
 
     if (state)
     {
@@ -154,9 +157,10 @@ void bootloader_heartbeat()
         val++;
     }
 
-    if (val > 30 || val < 1)
+    if (val > LED_MAX_SCALER || val < LED_MIN_SCALER)
     {
         state = !state;
     }
-    led_rgb((val * 3)<<8 | (val*10) << 16);
+
+    led_rgb(((val * g)<<8) | ((val*r) << 16) | (val*b));
 }
diff --git a/targets/stm32l442/bootloader/bootloader.h b/targets/stm32l442/bootloader/bootloader.h
index 576d981..d9b396a 100644
--- a/targets/stm32l442/bootloader/bootloader.h
+++ b/targets/stm32l442/bootloader/bootloader.h
@@ -22,8 +22,20 @@
 #define DISABLE_CTAPHID_WINK
 #define DISABLE_CTAPHID_CBOR
 
-
-#define LED_INIT_VALUE			0x101000
+//                              0xRRGGBB
+#define LED_INIT_VALUE			0x0a0300
+#define LED_MAX_SCALER          40
+#define LED_MIN_SCALER          1
+// # of ms between each change in LED
+#define HEARTBEAT_PERIOD        5
+// Each LED channel will be multiplied by a integer between LED_MAX_SCALER
+// and LED_MIN_SCALER to cause the slow pulse.  E.g.
+// #define LED_INIT_VALUE			0x301000
+// #define LED_MAX_SCALER          30
+// #define LED_MIN_SCALER          1
+// #define HEARTBEAT_PERIOD        8
+// Will pulse from 0x301000 to 0x903000 to 0x301000 ...
+// Which will take ~8 * (30)*2 ms
 
 // Button
 #define SOLO_BUTTON_PORT        GPIOA
diff --git a/targets/stm32l442/bootloader/main.c b/targets/stm32l442/bootloader/main.c
index ac19810..f9ce411 100644
--- a/targets/stm32l442/bootloader/main.c
+++ b/targets/stm32l442/bootloader/main.c
@@ -107,12 +107,12 @@ int main(int argc, char * argv[])
 
     memset(hidmsg,0,sizeof(hidmsg));
 
-    printf1(TAG_GEN,"recv'ing hid msg \n");
+    printf1(TAG_GEN,"recv'ing hid msg \n"); 
 
 
     while(1)
     {
-        if (millis() - t1 > 8)
+        if (millis() - t1 > HEARTBEAT_PERIOD)
         {
             bootloader_heartbeat();
             t1 = millis();
diff --git a/targets/stm32l442/src/app.h b/targets/stm32l442/src/app.h
index f506427..cd7ab5f 100644
--- a/targets/stm32l442/src/app.h
+++ b/targets/stm32l442/src/app.h
@@ -27,7 +27,20 @@ void hw_init(void);
 //#define TEST
 //#define TEST_POWER
 
-#define LED_INIT_VALUE			0x001000
+//                              0xRRGGBB
+#define LED_INIT_VALUE			0x000800
+#define LED_MAX_SCALER          30
+#define LED_MIN_SCALER          1
+// # of ms between each change in LED
+#define HEARTBEAT_PERIOD        100
+// Each LED channel will be multiplied by a integer between LED_MAX_SCALER
+// and LED_MIN_SCALER to cause the slow pulse.  E.g.
+// #define LED_INIT_VALUE			0x301000
+// #define LED_MAX_SCALER          30
+// #define LED_MIN_SCALER          1
+// #define HEARTBEAT_PERIOD        8
+// Will pulse from 0x301000 to 0x903000 to 0x301000 ...
+// Which will take ~8 * (30)*2 ms
 
 // Button
 #define SOLO_BUTTON_PORT        GPIOA
diff --git a/targets/stm32l442/src/device.c b/targets/stm32l442/src/device.c
index c5c6ead..80ba742 100644
--- a/targets/stm32l442/src/device.c
+++ b/targets/stm32l442/src/device.c
@@ -149,7 +149,10 @@ void main_loop_delay()
 void heartbeat()
 {
     static int state = 0;
-    static uint32_t val = (LED_INIT_VALUE >> 8) & 0xff;
+    static uint32_t val = (LED_MAX_SCALER - LED_MIN_SCALER)/2;
+    uint8_t r = (LED_INIT_VALUE >> 16) & 0xff;
+    uint8_t g = (LED_INIT_VALUE >> 8) & 0xff;
+    uint8_t b = (LED_INIT_VALUE >> 0) & 0xff;
     int but = IS_BUTTON_PRESSED();
 
     if (state)
@@ -161,13 +164,13 @@ void heartbeat()
         val++;
     }
 
-    if (val > 30 || val < 1)
+    if (val > LED_MAX_SCALER || val < LED_MIN_SCALER)
     {
         state = !state;
     }
-    if (but) led_rgb(val * 2);
+    if (but) led_rgb((val*b));
     else
-        led_rgb((val << 16) | (val*2 << 8));
+        led_rgb(((val * g)<<8) | ((val*r) << 16) | (val*b));
 }
 
 void authenticator_read_state(AuthenticatorState * a)