diff --git a/module.nix b/module.nix
index b761f80..aa37337 100644
--- a/module.nix
+++ b/module.nix
@@ -6,23 +6,42 @@ in
   options = {
     services.gatekeeper = {
       enable = lib.mkEnableOption "Enable the gatekeeper api service.";
-      dotenv = lib.mkOption {
-        type = lib.types.path;
-        description = "The path to a .env file with the keys";
+      envFile = lib.mkOption {
+        type = lib.types.nullOr lib.types.path;
+        description = "The path to a .env file with all the other options";
       };
       db = lib.mkOption {
         type = lib.types.path;
         description = "Where to save the database.";
+        default = "/var/lib/gatekeeper";
+      };
+      mockGpio = lib.mkOption {
+        type = lib.types.str;
+        default = "True";
+        description = "Mock GPIO pins. Has to be a string!";
       };
     };
   };
   config = lib.mkIf cfg.enable {
     users.groups.gatekeeper = {};
+    users.groups.gpio = {};
     users.users.gatekeeper = {
       description = "gatekeeper user";
       group = "gatekeeper";
+      extraGroups = ["gpio"];
       isSystemUser = true;
     };
+    services.udev.extraRules = lib.mkBefore ''
+      KERNEL=="gpiomem", GROUP="gpio", MODE="0660"
+      SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="${pkgs.bash}/bin/bash -c '${pkgs.coreutils}/bin/chgrp gpio /dev/%k && chmod 660 /dev/%k && ${pkgs.coreutils}/bin/chgrp -R gpio /sys/class/gpio && ${pkgs.coreutils}/bin/chmod -R g=u /sys/class/gpio'"
+      SUBSYSTEM=="gpio", ACTION=="add", PROGRAM="${pkgs.bash}/bin/bash -c '${pkgs.coreutils}/bin/chgrp -R gpio /sys%p && ${pkgs.coreutils}/bin/chmod -R g=u /sys%p'"
+    '';
+
+    boot.kernelParams = [
+      "iomem=relaxed" # for pigpiod 
+      "strict-devmem=0"
+    ];
+
     services.pcscd = {
       enable = true;
       plugins = [ pkgs.acsccid ];
@@ -43,6 +62,12 @@ in
         RestartSec = "20";
         StateDirectory = "gatekeeper";
         WorkingDirectory = "/var/lib/gatekeeper";
+        EnvironmentFile = cfg.envFile;
+      };
+      environment = {
+        SQLALCHEMY_DATABASE_URL = "sqlite:///${cfg.db}/gatekeeper.db";
+        ALEMBIC_CONFIG = "${self}/alembic.ini";
+        MOCK_GPIO = cfg.mockGpio;
       };
     };
   };