diff --git a/devices_v0.4/pcf.yaml b/devices_v0.4/pcf.yaml
new file mode 100644
index 0000000..1f8fc07
--- /dev/null
+++ b/devices_v0.4/pcf.yaml
@@ -0,0 +1,7 @@
+pcf8574:
+  - id: 'pcf_left'
+    address: 0x21
+    pcf8575: true
+  - id: 'pcf_right'
+    address: 0x20
+    pcf8575: true