diff --git a/src/gripper.py b/src/gripper.py
index 845315dac6a2704d41673397edf8bb01cf3dc524..aff5b9c44be8359d8ab606b02d396094f67e33ce 100755
--- a/src/gripper.py
+++ b/src/gripper.py
@@ -6,16 +6,19 @@ from client import FarmbotClient
 from creds import device_id
 from creds import token
 
+GRIPPER_PIN = 12
+GRIPPER_OPEN_STATE = 0
+GRIPPER_CLOSED_STATE = 1
 
 def gripper_open():
     """Manipulate gripper by setting pin to 1."""
     client = FarmbotClient(device_id, token)
-    client.write_pin(1, 1, pin_mode="digital")
+    client.write_pin(GRIPPER_PIN, GRIPPER_OPEN_STATE, pin_mode="digital")
     client.shutdown()
 
 
 def gripper_close():
     """Manipulate gripper by setting pin to 0."""
     client = FarmbotClient(device_id, token)
-    client.write_pin(1, 1, pin_mode="digital")
+    client.write_pin(GRIPPER_PIN, GRIPPER_CLOSED_STATE, pin_mode="digital")
     client.shutdown()