diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..a914804
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,15 @@
+[submodule "external/IT8951"]
+	path = external/IT8951
+	url = https://github.com/GregDMeyer/IT8951.git
+[submodule "external/pi_ina219"]
+	path = external/pi_ina219
+	url = https://github.com/chrisb2/pi_ina219.git
+[submodule "external/PyBMA400"]
+	path = external/PyBMA400
+	url = git@gitea.tourolle.paris:dtourolle/PyBMA400.git
+[submodule "external/PyFTtxx6"]
+	path = external/PyFTtxx6
+	url = git@gitea.tourolle.paris:dtourolle/PyFTtxx6.git
+[submodule "external/PyPCF8523"]
+	path = external/PyPCF8523
+	url = git@gitea.tourolle.paris:dtourolle/PyPCF8523.git
diff --git a/external/IT8951 b/external/IT8951
new file mode 160000
index 0000000..9f13613
--- /dev/null
+++ b/external/IT8951
@@ -0,0 +1 @@
+Subproject commit 9f136139378f74e17d9972d7165dc6ae53a2568e
diff --git a/external/PyBMA400 b/external/PyBMA400
new file mode 160000
index 0000000..513e064
--- /dev/null
+++ b/external/PyBMA400
@@ -0,0 +1 @@
+Subproject commit 513e06487b53d86ab677bb220653994f028be43f
diff --git a/external/PyFTtxx6 b/external/PyFTtxx6
new file mode 160000
index 0000000..ada908e
--- /dev/null
+++ b/external/PyFTtxx6
@@ -0,0 +1 @@
+Subproject commit ada908e6f4da4c437cf29dea70dda07ebd0edfe9
diff --git a/external/PyPCF8523 b/external/PyPCF8523
new file mode 160000
index 0000000..85794d9
--- /dev/null
+++ b/external/PyPCF8523
@@ -0,0 +1 @@
+Subproject commit 85794d9f2f4b1d0cd8db826c41c35307358102d9
diff --git a/external/pi_ina219 b/external/pi_ina219
new file mode 160000
index 0000000..5eb0868
--- /dev/null
+++ b/external/pi_ina219
@@ -0,0 +1 @@
+Subproject commit 5eb0868b6afd5879b656cbcbbb377d002e414e58