diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c60aa9..8ed012b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,3 +25,8 @@ All notable changes to this project will be documented in this file.
 
 ### Changed
 - Carrier detect not via Direwolf (only ax0), but via carrier-detect.sh script in main loop, so all channles (ax0, ax1 and ax2) have DCD
+
+## [0.0.3] - 2022-02-02
+
+### Changed
+- Carrier detect now written in C for speed
diff --git a/aprs_utils/carrier_detect/carrier_detect_led b/aprs_utils/carrier_detect/carrier_detect_led
new file mode 100755
index 0000000..25342d3
Binary files /dev/null and b/aprs_utils/carrier_detect/carrier_detect_led differ
diff --git a/aprs_utils/carrier_detect/carrier_detect_led.c b/aprs_utils/carrier_detect/carrier_detect_led.c
new file mode 100644
index 0000000..7f0e624
--- /dev/null
+++ b/aprs_utils/carrier_detect/carrier_detect_led.c
@@ -0,0 +1,22 @@
+#include <pigpio.h>
+#include <stdio.h>
+
+#define DCD_LED 17
+
+int main()
+{
+	if (gpioInitialise() < 0)
+	{
+	   // pigpio initialisation failed.
+	   printf("pigpio failed");
+	}
+	else
+	{
+	   // pigpio initialised okay.
+	   gpioSetMode(DCD_LED, PI_OUTPUT); // Set DCD_LED as output
+	   gpioWrite(DCD_LED, 1); // Set DCD_LED high
+	   gpioSleep(PI_TIME_RELATIVE, 1, 0);     // sleep for one second
+	   gpioWrite(DCD_LED, 0); // Set DCD_LED low
+	   gpioTerminate();
+	}
+}
diff --git a/aprs_utils/carrier_detect/howto-compile.txt b/aprs_utils/carrier_detect/howto-compile.txt
new file mode 100644
index 0000000..4c56b08
--- /dev/null
+++ b/aprs_utils/carrier_detect/howto-compile.txt
@@ -0,0 +1 @@
+gcc -Wall -pthread -o prog dcd.c -lpigpio -lrt
diff --git a/aprs_utils/carrier_detect_led b/aprs_utils/carrier_detect_led
new file mode 100755
index 0000000..25342d3
Binary files /dev/null and b/aprs_utils/carrier_detect_led differ
diff --git a/aprs_utils/process_traffic.sh b/aprs_utils/process_traffic.sh
index 16c064e..7d6371f 100755
--- a/aprs_utils/process_traffic.sh
+++ b/aprs_utils/process_traffic.sh
@@ -55,7 +55,7 @@ LAST_EPOCH_DATE="$(date -d"$CURRENT_DATE_TIME" +%s)"
 while read LINE
     do
 	# Light up carrier detect
-	/home/marcel/ham/aprs_utils/carrier_detect_led.sh  &
+	sudo /home/marcel/ham/aprs_utils/carrier_detect_led  &
 
         # Start filter for received messages to PE1RXF (all sufixes)
         # Messages addressed to PE1RXF are stored in file /home/marcel/ham/aprs_utils/aprs_received_messages.log
diff --git a/installation_pe1rxf-aprs-server.txt b/installation_pe1rxf-aprs-server.txt
index ebc6cb5..9e0bc54 100644
--- a/installation_pe1rxf-aprs-server.txt
+++ b/installation_pe1rxf-aprs-server.txt
@@ -262,7 +262,7 @@ sudo visudo
     marcel ALL = (root) NOPASSWD: /usr/sbin/kissattach
     marcel ALL = (root) NOPASSWD: /usr/sbin/kissparms
     marcel ALL = (root) NOPASSWD: /usr/bin/socat
-    marcel ALL = (root) NOPASSWD: /usr/bin/pigpiod
+    marcel ALL = (root) NOPASSWD: /home/marcel/ham/aprs_utuls/carrier_detect_led
 
 ---
 Install command line calculator
diff --git a/start_aprs_server.sh b/start_aprs_server.sh
index 30e23df..56b6f90 100755
--- a/start_aprs_server.sh
+++ b/start_aprs_server.sh
@@ -23,7 +23,7 @@
 ##################################################################################
 
    # Start pigpiod for accessing gpio pins for carrier_detect
-   sudo pigpiod
+   #sudo pigpiod
 
    ###########################
    # initializing soundmodem #
@@ -67,7 +67,7 @@
     ###########################
     # initializing LoRa modem #
     ###########################
-#    /home/marcel/ham/RPi-LoRa-KISS-TNC/start_all.sh
+    /home/marcel/ham/RPi-LoRa-KISS-TNC/start_all.sh
 
     # Start filter for received messages to PE1RXF (all sufixes)
     # Messages addressed to PE1RXF are stored in file /home/marcel/ham/aprs_utils/aprs_received_messages.log