diff --git a/pin_map.txt b/pin_map.txt
new file mode 100644
index 0000000..8f1cb17
--- /dev/null
+++ b/pin_map.txt
@@ -0,0 +1,7 @@
+relay_pin = 15
+sensor_pin = 19
+
+15 -> gpio3
+19 -> gpio 12
+
+wiring pi uses gpio numbers