diff --git a/software/modules/ModuleC.py b/software/modules/ModuleC.py
index 3ab88c9..b112ee2 100644
--- a/software/modules/ModuleC.py
+++ b/software/modules/ModuleC.py
@@ -51,29 +51,20 @@ class ModuleCWidget(QWidget):
         self.mode[1] = 'LC'
         self.setup_hw()
 
-    @pyqtSlot()
-    def on_btnStart_clicked(self):
-        self.ui.btnStart.setEnabled(False)
-        self.ui.btnStop.setEnabled(True)
-        self.current = 3.3
+    @pyqtSlot(bool)
+    def on_btnPower_clicked(self, checked):
+        if checked:
+            self.current = 3.3
+            self.ui.btnPower.setText('ON')
+        else:
+            self.current = 0.0
+            self.ui.btnPower.setText('OFF')
         if self.mode == ['DC', 'L']:
-            self.dev.setout(1, 1)
+            self.dev.setout(1, checked and 1 or 0)
         if self.mode == ['DC', 'C']:
-            self.dev.setout(2, 1)
+            self.dev.setout(2, checked and 1 or 0)
         if self.mode == ['DC', 'LC']:
-            self.dev.setout(3, 1)
-
-    @pyqtSlot()
-    def on_btnStop_clicked(self):
-        self.ui.btnStart.setEnabled(True)
-        self.ui.btnStop.setEnabled(False)
-        self.current = 0.0
-        if self.mode == ['DC', 'L']:
-            self.dev.setout(1, 0)
-        if self.mode == ['DC', 'C']:
-            self.dev.setout(2, 0)
-        if self.mode == ['DC', 'LC']:
-            self.dev.setout(3, 0)
+            self.dev.setout(3, checked and 1 or 1)
 
     def setup_hw(self):
         if self.mode == ['DC', 'L']:  # AD6
diff --git a/software/modules/ModuleC.ui b/software/modules/ModuleC.ui
index a15fcdf..4f20769 100644
--- a/software/modules/ModuleC.ui
+++ b/software/modules/ModuleC.ui
@@ -136,7 +136,7 @@
     </property>
    </widget>
   </widget>
-  <widget class="QPushButton" name="btnStart">
+  <widget class="QPushButton" name="btnPower">
    <property name="geometry">
     <rect>
      <x>10</x>
@@ -146,23 +146,10 @@
     </rect>
    </property>
    <property name="text">
-    <string>Start</string>
+    <string>OFF</string>
    </property>
-  </widget>
-  <widget class="QPushButton" name="btnStop">
-   <property name="enabled">
-    <bool>false</bool>
-   </property>
-   <property name="geometry">
-    <rect>
-     <x>10</x>
-     <y>280</y>
-     <width>81</width>
-     <height>31</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>Stop</string>
+   <property name="checkable">
+    <bool>true</bool>
    </property>
   </widget>
  </widget>