diff --git a/OLEDDisplay.cpp b/OLEDDisplay.cpp
index 466bb687..5fc15dbe 100644
--- a/OLEDDisplay.cpp
+++ b/OLEDDisplay.cpp
@@ -762,7 +762,6 @@ void inline OLEDDisplay::drawInternal(int16_t xMove, int16_t yMove, int16_t widt
     int16_t xPos = xMove + (i / rasterHeight);
     int16_t yPos = ((yMove >> 3) + (i % rasterHeight)) * displayWidth;
 
-    int16_t yScreenPos = yMove + yOffset;
     int16_t dataPos    = xPos  + yPos;
 
     if (dataPos >=  0  && dataPos < displayBufferSize &&
diff --git a/OLEDDisplay.h b/OLEDDisplay.h
index 95dcbd2b..83c966c8 100644
--- a/OLEDDisplay.h
+++ b/OLEDDisplay.h
@@ -273,10 +273,10 @@ class OLEDDisplay : public Print {
     char      *logBuffer                       = NULL;
 
     // Send a command to the display (low level function)
-    virtual void sendCommand(uint8_t com) {};
+    virtual void sendCommand(uint8_t com) {(void)com;};
 
     // Connect to the display
-    virtual bool connect() {return true;};
+    virtual bool connect() {return false;};
 
     // Send all the init commands
     void sendInitCommands();
diff --git a/OLEDDisplayUi.cpp b/OLEDDisplayUi.cpp
index 03eff9c4..b29b8b55 100644
--- a/OLEDDisplayUi.cpp
+++ b/OLEDDisplayUi.cpp
@@ -251,7 +251,7 @@ void OLEDDisplayUi::drawFrame(){
   switch (this->state.frameState){
      case IN_TRANSITION: {
        float progress = (float) this->state.ticksSinceLastStateSwitch / (float) this->ticksPerTransition;
-       int16_t x, y, x1, y1;
+       int16_t x = 0, y = 0, x1 = 0, y1 = 0;
        switch(this->frameAnimationDirection){
         case SLIDE_LEFT:
           x = -(this->display->getWidth()) * progress;
@@ -332,7 +332,7 @@ void OLEDDisplayUi::drawIndicator() {
       return;
     }
 
-    uint8_t posOfHighlightFrame;
+    uint8_t posOfHighlightFrame = 0;
     float indicatorFadeProgress = 0;
 
     // if the indicator needs to be slided in we want to
@@ -372,6 +372,7 @@ void OLEDDisplayUi::drawIndicator() {
     const uint8_t *image;
 
     uint16_t x,y;
+
     for (byte i = 0; i < this->frameCount; i++) {
 
       switch (this->indicatorPosition){
diff --git a/SSD1306Wire.h b/SSD1306Wire.h
index e82d9b54..2c92327e 100644
--- a/SSD1306Wire.h
+++ b/SSD1306Wire.h
@@ -91,7 +91,7 @@ class SSD1306Wire : public OLEDDisplay {
         // If the minBoundY wasn't updated
         // we can savely assume that buffer_back[pos] == buffer[pos]
         // holdes true for all values of pos
-        if (minBoundY == ~0) return;
+        if (minBoundY == (uint8_t)(~0)) return;
 
         sendCommand(COLUMNADDR);
         sendCommand(minBoundX);