diff --git a/.gitmodules b/.gitmodules
index f696841..9453d75 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,48 +1,48 @@
-[submodule "src/hispec/util/lakeshore"]
+[submodule "src/hispec/driver/lakeshore"]
 	path = src/hispec/driver/lakeshore
 	url = https://github.com/COO-Utilities/lakeshore
 	branch = main
-[submodule "src/hispec/util/inficon"]
+[submodule "src/hispec/driver/inficon"]
 	path = src/hispec/driver/inficon
 	url = https://github.com/COO-Utilities/inficon
 	branch = main
-[submodule "src/hispec/util/gammavac"]
+[submodule "src/hispec/driver/gammavac"]
 	path = src/hispec/driver/gammavac
 	url = https://github.com/COO-Utilities/gammavac
 	branch = main
-[submodule "src/hispec/util/standa"]
+[submodule "src/hispec/driver/standa"]
 	path = src/hispec/driver/standa
 	url = https://github.com/COO-Utilities/standa
 	branch = main
-[submodule "src/hispec/util/thorlabs"]
+[submodule "src/hispec/driver/thorlabs"]
 	path = src/hispec/driver/thorlabs
 	url = https://github.com/COO-Utilities/thorlabs
 	branch = main
-[submodule "src/hispec/util/sunpower"]
+[submodule "src/hispec/driver/sunpower"]
 	path = src/hispec/driver/sunpower
 	url = https://github.com/COO-Utilities/sunpower
 	branch = main
-[submodule "src/hispec/util/onewire"]
+[submodule "src/hispec/driver/onewire"]
 	path = src/hispec/driver/onewire
 	url = https://github.com/COO-Utilities/onewire
 	branch = main
-[submodule "src/hispec/util/xeryon"]
+[submodule "src/hispec/driver/xeryon"]
 	path = src/hispec/driver/xeryon
 	url = https://github.com/COO-Utilities/xeryon
 	branch = main
-[submodule "src/hispec/util/pi"]
+[submodule "src/hispec/driver/pi"]
 	path = src/hispec/driver/pi
 	url = https://github.com/COO-Utilities/pi
 	branch = main
-[submodule "src/hispec/util/srs"]
+[submodule "src/hispec/driver/srs"]
 	path = src/hispec/driver/srs
 	url = https://github.com/COO-Utilities/srs
 	branch = main
-[submodule "src/hispec/util/ozoptics"]
+[submodule "src/hispec/driver/ozoptics"]
 	path = src/hispec/driver/ozoptics
 	url = https://github.com/COO-Utilities/ozoptics
 	branch = main
-[submodule "src/hispec/util/newport"]
+[submodule "src/hispec/driver/newport"]
 	path = src/hispec/driver/newport
 	url = https://github.com/COO-Utilities/newport
 	branch = main
@@ -53,3 +53,7 @@
 	path = etc/camera-interface
 	url = https://github.com/CaltechOpticalObservatories/camera-interface
 	branch = main
+[submodule "src/hispec/driver/pdu"]
+	path = src/hispec/driver/pdu
+	url = https://github.com/COO-Utilities/pdu
+	branch = main
diff --git a/src/hispec/driver/pdu b/src/hispec/driver/pdu
new file mode 160000
index 0000000..6ec26a5
--- /dev/null
+++ b/src/hispec/driver/pdu
@@ -0,0 +1 @@
+Subproject commit 6ec26a574f731728ed67199cb2edbe23c62fbd9e