added hold button for new key

ddr-control-panel.ino

@@ -3,6 +3,7 @@
 Convert DDR control panel to buttons.
 DDR control panel uses a JST YLR-12V connector
 Pins 1-6 are used for buttons, pin 7 and 8 are GRD
+Hold down L1+R1+S1 for 5 seconds (hold_time) for different key
 
 Button to keyboard mappings
 Left 1 : A
@@ -11,6 +12,8 @@ Right 1 : D
 Right 2 : L
 Start 1 : S
 Start 2 : K
+L1+R1+S1 (hold_time) : Q
+L2+R2+S2 (hold_time) : P
 
 */
 
@@ -22,6 +25,11 @@ Start 2 : K
 #define BT_S1 5
 #define BT_S2 6
 
+// Timer preperation for ESC (back)
+bool L1_held = false, L2_held = false, R1_held = false, R2_held = false, S1_held = false, S2_held = false, E1_held = false, E2_held = false;
+bool P1_held = false, P2_held = false;
+unsigned long P1_time = 0, P2_time = 0;
+const long hold_time = 5000; // how long to hold for
 
 #include <Keyboard.h>
 
@@ -50,56 +58,153 @@ void loop()
 {
     // Check button inputs
     if(digitalRead(BT_L1) == LOW)
+    {
+        if(!E1_held) // make sure we're not trying to use back
         {
             Keyboard.press('a');
+            L1_held = true;
+        }
     }
     else
     {
         Keyboard.release('a');
+        L1_held = false;
     }
 
     if(digitalRead(BT_L2) == LOW)
+    {
+        if(!E2_held)
         {
             Keyboard.press('j');
+            L2_held = true;
+        }
     }
     else
     {
         Keyboard.release('j');
+        L2_held = false;
     }
 
     if(digitalRead(BT_R1) == LOW)
+    {
+        if(!E1_held)
         {
             Keyboard.press('d');
+            R1_held = true;
+        }
     }
     else
     {
         Keyboard.release('d');
+        R1_held = false;
     }
 
     if(digitalRead(BT_R2) == LOW)
+    {
+        if(!E2_held)
         {
             Keyboard.press('l');
+            R2_held = true;
+        }
     }
     else
     {
         Keyboard.release('l');
+        R2_held = false;
     }
 
     if(digitalRead(BT_S1) == LOW)
+    {
+        if(!E1_held)
         {
             Keyboard.press('s');
+            S1_held = true;
+        }
     }
     else
     {
         Keyboard.release('s');
+        S1_held = false;
     }
 
     if(digitalRead(BT_S2) == LOW)
+    {
+        if(!E2_held)
         {
             Keyboard.press('k');
+            S2_held = true;
+        }
     }
     else
     {
         Keyboard.release('k');
+        S2_held = false;
+    }
+
+    // check hold status to determine ESC keys
+    if(!L1_held || !R1_held || !S1_held)
+    {
+        E1_held = false;
+        P1_held = false;
+        P1_time = 0;
+    }
+    else
+    {
+        // determine time held
+        if(!P1_held)
+        {
+            P1_held = true;
+            P1_time = millis(); // start timer
+        }
+        else
+        {
+            if(millis() - P1_time >= hold_time)
+            {
+                E1_held = true;
+            }
+        }
+
+    }
+
+    if(!L2_held || !R2_held || !S2_held)
+    {
+        E2_held = false;
+        P2_held = false;
+        P2_time = 0;
+    }
+    else
+    {
+        // determine time held
+        if(!P2_held)
+        {
+            P2_held = true;
+            P2_time = millis(); // start timer
+        }
+        else
+        {
+            if(millis() - P2_time >= hold_time)
+            {
+                E2_held = true;
+            }
+        }
+    }
+
+    // ESC (back) keys
+    if(E1_held)
+    {
+        Keyboard.press('q');
+    }
+    else
+    {
+        Keyboard.release('q');
+    }
+
+    if(E2_held)
+    {
+        Keyboard.press('p');
+    }
+    else
+    {
+        Keyboard.release('p');
     }
 }