Added stepper driver test script

firmware/stepper_driver_test/stepper_driver_test.ino

@@ -0,0 +1,29 @@
+// Pin definitions
+#define DATA_PIN  D5  // DS
+#define CLOCK_PIN D6  // SH_CP
+#define LATCH_PIN D7  // ST_CP
+
+void setup() {
+  // Initialize pins
+  pinMode(DATA_PIN, OUTPUT);
+  pinMode(CLOCK_PIN, OUTPUT);
+  pinMode(LATCH_PIN, OUTPUT);
+}
+
+void writeStep(byte stepByte){
+  shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, stepByte);
+  digitalWrite(LATCH_PIN, HIGH);
+  digitalWrite(LATCH_PIN, LOW);
+  delayMicroseconds(800); //780 min
+}
+
+void loop() {
+ writeStep(0b00010001);
+ writeStep(0b00110011);
+ writeStep(0b00100010);
+ writeStep(0b01100110);
+ writeStep(0b01000100);
+ writeStep(0b11001100);
+ writeStep(0b10001000);
+ writeStep(0b10011001);
+}