Added configuration example for the BQ Hephestos 2 3D printer.

Added support for BQ ZUM Mega 3D board and stock Hephestos 2 thermistor.

Marlin/pins_BQ_ZUM_MEGA_3D.h

@@ -0,0 +1,81 @@
+/**
+ * bq ZUM Mega 3D board definition
+ */
+
+#ifndef __AVR_ATmega2560__
+  #error Oops! Make sure you have 'Arduino Mega 2560' selected from the 'Tools -> Boards' menu.
+#endif
+
+#define LARGE_FLASH         true
+
+#define LED_PIN             13
+
+#define X_STEP_PIN          54
+#define X_DIR_PIN           55
+#define X_ENABLE_PIN        38
+#define X_MIN_PIN           3
+#define X_MAX_PIN           79
+
+#define Y_STEP_PIN          60
+#define Y_DIR_PIN           61
+#define Y_ENABLE_PIN        56
+#define Y_MIN_PIN           14
+#define Y_MAX_PIN           15
+
+#define Z_STEP_PIN          46
+#define Z_DIR_PIN           48
+#define Z_ENABLE_PIN        77
+#define Z_MIN_PIN           18 // Z-MIN Label
+#define Z_MAX_PIN           19 // IND_S_5V
+
+#define E0_STEP_PIN         26
+#define E0_DIR_PIN          28
+#define E0_ENABLE_PIN       24
+
+#define E1_STEP_PIN         36
+#define E1_DIR_PIN          34
+#define E1_ENABLE_PIN       30
+
+#define FAN_PIN             12
+#define HEATER_0_PIN        9
+#define TEMP_0_PIN          13
+
+#define FAN1_PIN            7
+#define HEATER_1_PIN        10
+#define TEMP_1_PIN          14
+
+#define HEATER_BED_PIN      8
+#define TEMP_BED_PIN        15
+
+#undef DIGIPOTSS_PIN
+#define DIGIPOTSS_PIN       22
+#define DIGIPOT_CHANNELS    { 4, 5, 3 , 0, 1 }
+
+#define PS_ON_PIN           81 // External Power Supply
+
+#if ENABLED(BQ_LCD_SMART_CONTROLLER)
+	#define KILL_PIN        41
+
+	#define LCD_PIN_BL      39
+	#define LCD_PINS_RS     16
+	#define LCD_PINS_ENABLE 17
+	#define LCD_PINS_D4     23
+
+	#define BTN_EN1         31
+	#define BTN_EN2         33
+	#define BTN_ENC         35
+
+	#define BEEPER_PIN      37
+
+    #define SDPOWER         -1
+	#define SDSS            53
+	#define SD_DETECT_PIN   49
+#endif
+
+#if ENABLED(AUTO_BED_LEVELING_FEATURE)
+ 	#undef Z_MIN_PIN
+ 	#undef Z_MAX_PIN
+
+	#define Z_MIN_PIN       19 // IND_S_5V
+	#define Z_MAX_PIN       18 // Z-MIN Label
+#endif