diff --git a/syringe.h b/syringe.h
index 9d8b3588b57e8ee241fcfe3d69324012ebf5becd..f158d4a09732c7cb0e5a924b79f5ac3da7e4b3ff 100644
--- a/syringe.h
+++ b/syringe.h
@@ -99,3 +99,5 @@ private:
 	float piston_surface = 0;
 
 };
+
+extern Syringe syringe;
diff --git a/web.cpp b/web.cpp
index 32a793aff532ee46516b69ec6a5d18d84abe09a5..7ebf386a7cf5934c112753e94f394ce63016a652 100644
--- a/web.cpp
+++ b/web.cpp
@@ -108,7 +108,15 @@ void webSetup ()
     ESPUI.addControl(ControlType::Min, "", "0", ControlColor::None, constantFlow);
     ESPUI.addControl(ControlType::Max, "", "30", ControlColor::None, constantFlow);
 
-    uint16_t displacementDistance = ESPUI.addControl(ControlType::Slider, "Select a seringe displacement distance (mm)", "100", ControlColor::Alizarin, Control::noParent, &slider);
+    //uint16_t displacementDistance = ESPUI.addControl(ControlType::Slider, "Select a seringe displacement distance (mm)", "100", ControlColor::Alizarin, Control::noParent, &slider);
+    uint16_t displacementDistance = ESPUI.addControl(ControlType::Slider, "Select a seringe displacement distance (mm)", "100", ControlColor::Alizarin, Control::noParent,
+        [](Control *sender, int type)
+        {
+            Serial.printf("val=%s\n", sender->value.c_str()); 
+            Syringe::Syringe_configuration_t conf = syringe.configuration();
+            conf.volume_value = syringe.mmToMm3(atof(sender->value.c_str()));
+            syringe.configureSyringe(conf);
+        });
     ESPUI.addControl(ControlType::Min, "", "0", ControlColor::None, displacementDistance);
     ESPUI.addControl(ControlType::Max, "", "100", ControlColor::None, displacementDistance);
 
@@ -116,7 +124,13 @@ void webSetup ()
     ESPUI.addControl(ControlType::Min, "", "0", ControlColor::None, displacementTime);
     ESPUI.addControl(ControlType::Max, "", "100", ControlColor::None, displacementTime);
 
-    button1 = ESPUI.addControl(ControlType::Button, "Actuate", "Press", ControlColor::Peterriver, Control::noParent, &buttonCallback);
+    //button1 = ESPUI.addControl(ControlType::Button, "Actuate", "Press", ControlColor::Peterriver, Control::noParent, &buttonCallback);
+    button1 = ESPUI.addControl(ControlType::Button, "Actuate", "Press", ControlColor::Peterriver, Control::noParent,
+        [](Control *sender, int type)
+        {
+            if (type == B_UP)
+                syringe.fill();
+        });
 
     /*
      * .begin loads and serves all files from PROGMEM directly.