added comments

ddr-control-panel.ino

@@ -1,3 +1,19 @@
+/*
+
+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
+
+Button to keyboard mappings
+Left 1 : A
+Left 2 : D
+Right 1 : J
+Right 2 : L
+Start 1 : S
+Start 2 : K
+
+*/
+
 #define BT_L1 1
 #define BT_L2 2
 #define BT_R1 3
@@ -9,6 +25,7 @@
 
 void setup()
 {
+    // Setup pins
     pinMode (BT_L1, INPUT);
     pinMode (BT_L2, INPUT);
     pinMode (BT_R1, INPUT);
@@ -16,6 +33,7 @@ void setup()
     pinMode (BT_S1, INPUT);
     pinMode (BT_S2, INPUT);
 
+    // Set pins to high
     digitalWrite(BT_L1, HIGH);
     digitalWrite(BT_L2, HIGH);
     digitalWrite(BT_R1, HIGH);
@@ -28,6 +46,7 @@ void setup()
 
 void loop()
 {
+    // Check button inputs
     if(digitalRead(BT_L1) == LOW)
     {
         Keyboard.press('a');