diff --git a/pump_volume.py b/pump_volume.py
deleted file mode 100644
index 001324a..0000000
--- a/pump_volume.py
+++ /dev/null
@@ -1,21 +0,0 @@
-from adafruit_motor import stepper
-from adafruit_motorkit import MotorKit
-from time import sleep
-
-kit = MotorKit()
-
-pump = kit.stepper2
-
-pump.release()
-
-
-
-def pump_volume(vol):
-    nb_step=vol*507 #35000steps for 69g with sleep(0.05) in between 2 steps
-    for i in range(nb_step):
-        pump.onestep(direction=stepper.FORWARD, style=stepper.DOUBLE)
-        sleep(0.05)
-    pump.release()
-    
-    
-pump_volume(5)
diff --git a/pump_volume_flowrate.py b/pump_volume_flowrate.py
new file mode 100644
index 0000000..55b3f15
--- /dev/null
+++ b/pump_volume_flowrate.py
@@ -0,0 +1,43 @@
+from adafruit_motor import stepper
+from adafruit_motorkit import MotorKit
+from time import sleep
+from datetime import datetime
+import time
+
+kit = MotorKit()
+
+pump = kit.stepper2
+
+pump.release()
+
+
+
+def pump_volume(vol, flowrate):
+    nb_step=vol*507 #if sleep(0.05) in between 2 steps
+    #35000steps for 69g 
+    #nb_step=vol*460 if sleep(0) in between 2 steps
+    duration=(vol*60)/flowrate
+    delay=(duration/nb_step)-0.005
+    #flowrate is about 2.2ml/min
+    for i in range(nb_step):
+        pump.onestep(direction=stepper.FORWARD, style=stepper.DOUBLE)
+        sleep(delay)
+    print(delay)
+    sleep(1)
+    pump.release()
+    
+volume=1
+
+flowrate=1 #20 is the max
+
+start = time.time()
+
+pump_volume(volume, flowrate)
+
+end = time.time()
+
+duration = end-start
+
+print(duration)
+
+