diff --git a/hydra/mcu.json b/hydra/mcu.json
index ec3df67..80dffff 100644
--- a/hydra/mcu.json
+++ b/hydra/mcu.json
@@ -14,7 +14,7 @@
             "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs nixos-21.05", "emailresponsible": false },
             "mozillaOverlay": { "type": "git", "value": "git://github.com/mozilla/nixpkgs-mozilla.git", "emailresponsible": false },
             "nixScripts": { "type": "git", "value": "https://git.m-labs.hk/M-Labs/nix-scripts.git", "emailresponsible": false },
-            "stabilizerSrc": { "type": "git", "value": "git://github.com/quartiq/stabilizer.git", "emailresponsible": false },
+            "stabilizerSrc": { "type": "git", "value": "git://github.com/HarryMakes/stabilizer.git pre-mqtt 1", "emailresponsible": false },
             "thermostatSrc": { "type": "git", "value": "https://git.m-labs.hk/M-Labs/thermostat.git", "emailresponsible": false },
             "humpbackDdsSrc": { "type": "git", "value": "https://git.m-labs.hk/M-Labs/humpback-dds.git", "emailresponsible": false },
             "saymaMmcSrc": { "type": "git", "value": "git://github.com/sinara-hw/openMMC sayma-devel", "emailresponsible": false }
diff --git a/mcu/default.nix b/mcu/default.nix
index cc58861..44b05ae 100644
--- a/mcu/default.nix
+++ b/mcu/default.nix
@@ -8,23 +8,24 @@ let
   rustPlatform = pkgs.recurseIntoAttrs (pkgs.callPackage ./rustPlatform.nix {
     inherit rustManifest;
   });
-  buildStm32Firmware = { name, src, patchPhase ? "", extraNativeBuildInputs ? [], checkPhase ? "", ... } @ args:
+  buildStm32Firmware = { name, src, cargoDepsName ? name, patchPhase ? "", extraNativeBuildInputs ? [], checkPhase ? "", doCheck ? true, ... } @ args:
     let
-      # If binaryName is specified as an arg of buildStm32Firmware,
-      # then the .nix containing the cargoSha256 must be named "cargosha256-${binaryName}.nix";
-      # otherwise, the .nix must be named "cargosha256.nix".
       cargoSha256Drv = pkgs.runCommand "${name}-cargosha256" { } ''
-        cp "${src}/cargosha256${
-          if (args ? binaryName) then "-" + args.binaryName else ""
-        }.nix" $out
+        cp "${src}/cargosha256.nix" $out
         '';
-      # If binaryName is specified as an arg of buildStm32Firmware,
+      # If binaryName is specified,
+      # then pass it as an argument for `cargo build`; otherwise, do not add such argument.
+      extraCargoBuildArgs = (
+        (if (args ? extraCargoBuildArgs) then (args.extraCargoBuildArgs + " ") else "") +
+        (if (args ? binaryName) then ("--bin " + binaryName) else "")
+      );
+      # If binaryName is specified,
       # then use it as the filename of the ELF generated from `cargo build`;
       # otherwise, use the `name` arg (i.e. the Rust package name) as the ELF filename.
       binaryName = if (args ? binaryName) then args.binaryName else name;
     in
       rustPlatform.buildRustPackage rec {
-        inherit name;
+        inherit name cargoDepsName;
         version = "0.0.0";
 
         inherit src;
@@ -34,10 +35,10 @@ let
         nativeBuildInputs = [ pkgs.llvm ] ++ extraNativeBuildInputs;
         buildPhase = ''
           export CARGO_HOME=$(mktemp -d cargo-home.XXX)
-          cargo build --release
+          cargo build --release ${extraCargoBuildArgs}
         '';
 
-        inherit checkPhase;
+        inherit checkPhase doCheck;
         installPhase = ''
           mkdir -p $out $out/nix-support
           cp target/thumbv7em-none-eabihf/release/${binaryName} $out/${name}.elf
@@ -50,10 +51,13 @@ let
       };
   migen = (import ../artiq-fast/pkgs/python-deps.nix { inherit (pkgs) lib fetchgit fetchFromGitHub python3Packages; misoc-new = true; }).migen;
 in
-  {
-    stabilizer-dual-iir = buildStm32Firmware {
-      name = "stabilizer-dual-iir";
-      binaryName = "dual-iir";
+  pkgs.lib.attrsets.mapAttrs'
+    (name: value: pkgs.lib.attrsets.nameValuePair ("stabilizer-" + name)
+    (buildStm32Firmware {
+      name = "stabilizer-" + name;
+      # If binaryName is not specified, use the attribute name as binaryName by default.
+      binaryName = if (value ? binaryName) then value.binaryName else name;
+      cargoDepsName = "stabilizer";
       src = <stabilizerSrc>;
       patchPhase = ''
         substituteInPlace src/hardware/configuration.rs \
@@ -62,7 +66,25 @@ in
           --replace "Ipv4Address::new(10, 34, 16, 1)" \
                     "Ipv4Address::new(192, 168, 1, 1)"
       '';
-    };
+      doCheck = false;
+    })) {
+      dual-iir = {};
+      dual-iir-pounder_v1_1 = {
+        binaryName = "dual-iir";
+        extraCargoBuildArgs = "--features pounder_v1_1";
+      };
+      lockin-external = {};
+      lockin-external-pounder_v1_1 = {
+        binaryName = "lockin-external";
+        extraCargoBuildArgs = "--features pounder_v1_1";
+      };
+      lockin-internal = {};
+      lockin-internal-pounder_v1_1 = {
+        binaryName = "lockin-internal";
+        extraCargoBuildArgs = "--features pounder_v1_1";
+      };
+    } //
+  {
     thermostat = buildStm32Firmware {
       name = "thermostat";
       src = <thermostatSrc>;