example implementation of using buttons for output axes

config.h

     CHANNEL_THROTTLE = 2,
     CHANNEL_YAW = 3,
     CHANNEL_AUX1 = 4,
-    CHANNEL_AUX2 = 5
+    CHANNEL_AUX2 = 5,
+    CHANNEL_AUX3 = 6
 };
 
 // Increase string number when struct changes!

events.h

   public:
     JoystickEventsCPPM(JoystickEvents* client = 0);
     virtual void OnGamePadChanged(const GamePadEventData& evt);
+    virtual void OnButtonUp(uint8_t but_id);
+    virtual void OnButtonDown(uint8_t but_id);
 
     uint8_t getInvert(uint8_t ch) {
         if (ch < CHANNELS_MAX) return invert[ch];

events_cppm.cpp

 }
 
 void JoystickEventsCPPM::OnGamePadChanged(const GamePadEventData& evt) {
+    // up to CHANNEL_AUX2 we are using axes
     for (uint8_t i = 0; i < (CHANNEL_AUX2 + 1); i++) {
         uint16_t value = ((int32_t)getJoystickAxis(evt, i)) + trim[i];
         values[i] = map(value, 0, getJoystickMax(i),
     }
 }
 
+void JoystickEventsCPPM::OnButtonUp(uint8_t but_id) {
+    // if you want to do something when a button is released
+    // do it here...
+
+    if (client) {
+        client->OnButtonUp(but_id);
+    }
+}
+
+void JoystickEventsCPPM::OnButtonDown(uint8_t but_id) {
+    // called when a button is pressed
+    if (but_id == 42) { // TODO proper button id
+        // set CHANNEL_AUX3 according to button
+        values[CHANNEL_AUX3] = 1000;
+    } else if (but_id == 23) { // TODO proper button id
+        values[CHANNEL_AUX3] = 2000;
+    }
+
+    CPPM::instance().copy(values);
+
+    if (client) {
+        client->OnButtonDown(but_id);
+    }
+}
+
 uint16_t JoystickEventsCPPM::getJoystickAxis(const GamePadEventData& evt, uint8_t ch) {
     if (ch == CHANNEL_ROLL) {
         return evt.X;