diff --git a/2configs/deployment/led-fader.nix b/2configs/deployment/led-fader.nix
index fee7419..a184164 100644
--- a/2configs/deployment/led-fader.nix
+++ b/2configs/deployment/led-fader.nix
@@ -3,6 +3,26 @@
 with import <stockholm/lib>;
 let
   mq = "192.168.8.11";
+
+  pkg = pkgs.stdenv.mkDerivation {
+    name = "ampel-master";
+    src = pkgs.fetchgit {
+      url = "http://cgit.euer.krebsco.de/ampel";
+      rev = "07a6791de368e16cc0864d2676fd255eba522cee";
+      sha256 = "1jxjapvkfglvgapy7gjbr1nra3ay418nvz70bvypcmv7wc8d4h8q";
+    };
+    buildInputs = [
+      (pkgs.python35.withPackages (pythonPackages: with pythonPackages; [
+        docopt
+        paho-mqtt
+      ]))
+    ];
+    installPhase = ''
+      install -m755 -D fade.py  $out/bin/fade.py
+      install -m755 -D ampel.py $out/bin/ampel
+      install -m755 -D times.json $out/share/times.json
+    '';
+  };
 in {
   systemd.services.led-fader  = {
     description = "Send led change to message queue";
@@ -10,17 +30,9 @@ in {
       NIX_PATH = "/var/src";
     };
     wantedBy = [ "multi-user.target" ];
-    path = with pkgs; [
-      nix # nix-shell
-      mosquitto #mosquitto_pub
-      bash # nix-shell
-    ];
     serviceConfig = {
       # User = "nobody"; # need a user with permissions to run nix-shell
-      ExecStart = pkgs.writeDash "run-fader" ''
-      ${./fade.py} --add-empty --mode chain 3 loop --skip-unchanged 0.002 0.1 \
-        | mosquitto_pub -h ${mq} -p 1883 -l -t '/leds/nodemcu-switcher/set'
-      '';
+      ExecStart = "${pkg}/bin/ampel 4 ${pkg}/share/times.json";
       PrivateTmp = true;
     };
   };