diff --git a/pymycobot/README.md b/pymycobot/README.md
index 1ad9443..f4f28b7 100644
--- a/pymycobot/README.md
+++ b/pymycobot/README.md
@@ -63,6 +63,8 @@ We support Python2, Python3.5 or later.
         * [set_gripper_value](#set_gripper_value)
         * [set_gripper_ini](#set_gripper_ini)
         * [is_gripper_moving](#is_gripper_moving)
+    * [Basic](#basic)
+        * [set_basic_output](#set_basic_output)
 * [Angle](#angle)
 * [Coord](#coord)
 
@@ -605,6 +607,19 @@ from pymycobot.mycobot import MyCobot
   - `1` : is moving
   - `-1`: error data
 
+## Basic
+
+### set_basic_output
+
+- **Prototype**: `set_basic_output(pin_no, pin_signal)`
+
+- **Description**: Set bottom pin.
+
+- **Parameters**
+
+  - `pin_no` (`int`) Pin number.
+  - `pin_signal` (`int`): 0 / 1
+
 # Angle
 
 ```python
diff --git a/tests/test_api.py b/tests/test_api.py
index 68bfecd..a521a70 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -103,7 +103,7 @@ def test_jog(setup):
     mc.pause()
 
     time.sleep(3)
-    print(mc.is_paused())  # FIXME:
+    print(mc.is_paused())   # FIXME:
     print("speed get", mc.get_speed())
     mc.set_speed(20)
     print("speed set", mc.get_speed())
@@ -111,7 +111,7 @@ def test_jog(setup):
     time.sleep(6)
 
     print("resume")
-    mc.resume()  # FIXME:
+    mc.resume()   # FIXME:
     time.sleep(10)
 
     coords = [160, 140, 160, 0, 0, 0]
@@ -136,7 +136,7 @@ def test_state_control(setup):
     time.sleep(4)
 
     print("is moving: 1 - true, 0 - false")
-    print(mc.is_moving())  # FIXME:
+    print(mc.is_moving())   # FIXME:
     time.sleep(1)
     mc.jog_angle(1, 1, 10)
     time.sleep(1)
@@ -247,6 +247,26 @@ def test_io(setup):
     mc.set_digital_output(19, 0)
 
 
+def test_pump(setup):
+    print("==========================================================")
+    print("Start Pump test...")
+
+    def pump_on():
+        mc.set_basic_output(2, 0)
+        mc.set_basic_output(5, 0)
+
+    def pump_off():
+        mc.set_basic_output(2, 1)
+        mc.set_basic_output(5, 1)
+
+    pump_off()
+    time.sleep(3)
+    pump_on()
+    time.sleep(3)
+    pump_off()
+    time.sleep(3)
+
+
 if __name__ == "__main__":
     setup()
     test_basic_api()