diff --git a/pkgs/development/libraries/adslib/default.nix b/pkgs/development/libraries/adslib/default.nix
new file mode 100644
index 00000000000..49b54960b7e
--- /dev/null
+++ b/pkgs/development/libraries/adslib/default.nix
@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "adslib";
+  version = "unstable-2020-08-28";
+
+  src = fetchFromGitHub {
+    owner = "stlehmann";
+    repo = "ADS";
+    rev = "c457b60d61d73325837ca50be2cc997c4792d481";
+    sha256 = "11r86xa8fr4z957hd0abn8x7182nz30a198d02y7gzpbhpi3z43k";
+  };
+
+  installPhase = ''
+    mkdir -p $out/lib
+    cp adslib.so $out/lib/adslib.so
+  '';
+
+  meta = with lib; {
+    description = "Beckhoff protocol to communicate with TwinCAT devices";
+    homepage = "https://github.com/stlehmann/ADS";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jamiemagee ];
+  };
+}
diff --git a/pkgs/development/python-modules/pyads/default.nix b/pkgs/development/python-modules/pyads/default.nix
new file mode 100644
index 00000000000..37d3b31a365
--- /dev/null
+++ b/pkgs/development/python-modules/pyads/default.nix
@@ -0,0 +1,30 @@
+{ adslib, buildPythonPackage, fetchFromGitHub, lib, pytestCheckHook, pytest
+, pytestcov, pythonOlder }:
+
+buildPythonPackage rec {
+  pname = "pyads";
+  version = "3.2.2";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "stlehmann";
+    repo = pname;
+    rev = version;
+    sha256 = "1jd727pw0z73y4xhrykqkfcz1acrpy3rks58lr1y4yilfv11p6jb";
+  };
+
+  buildInputs = [ adslib ];
+  patchPhase = ''
+    substituteInPlace pyads/pyads_ex.py \
+      --replace "ctypes.CDLL(adslib)" "ctypes.CDLL(\"${adslib}/lib/adslib.so\")"
+  '';
+  checkInputs = [ pytestCheckHook pytest pytestcov ];
+
+  meta = with lib; {
+    description = "Python wrapper for TwinCAT ADS library";
+    homepage = "https://github.com/MrLeeh/pyads";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jamiemagee ];
+  };
+}
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index 13cd0054d17..cd58c6fb103 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -10,7 +10,7 @@
     "acmeda" = ps: with ps; [ ]; # missing inputs: aiopulse
     "actiontec" = ps: with ps; [ ];
     "adguard" = ps: with ps; [ adguardhome ];
-    "ads" = ps: with ps; [ ]; # missing inputs: pyads
+    "ads" = ps: with ps; [ pyads ];
     "aftership" = ps: with ps; [ ]; # missing inputs: pyaftership
     "agent_dvr" = ps: with ps; [ ]; # missing inputs: agent-py
     "air_quality" = ps: with ps; [ ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 588c79b785d..d2bb1badd8f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11830,6 +11830,8 @@ in
 
   adns = callPackage ../development/libraries/adns { };
 
+  adslib = callPackage ../development/libraries/adslib { };
+
   afflib = callPackage ../development/libraries/afflib { };
 
   aften = callPackage ../development/libraries/aften { };
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f83a88f1644..9082d90bba5 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4728,6 +4728,8 @@ in {
 
   pyacoustid = callPackage ../development/python-modules/pyacoustid { };
 
+  pyads = callPackage ../development/python-modules/pyads { };
+
   pyaes = callPackage ../development/python-modules/pyaes { };
 
   pyairvisual = callPackage ../development/python-modules/pyairvisual { };