sample arduino sketch for testing nema17

arduino/nema_test.ino

@@ -0,0 +1,53 @@
+// testing a stepper motor with a Pololu A4988 driver board or equivalent
+// on an Uno the onboard led will flash with each step
+// this version uses delay() to manage timing
+
+byte directionPin = 2;
+byte stepPin = 3;
+int numberOfSteps = 100;
+byte ledPin = 13;
+int pulseWidthMicros = 20;  // microseconds
+int millisbetweenSteps = 250; // milliseconds - or try 1000 for slower steps
+
+
+void setup() {
+
+  Serial.begin(115200);
+  Serial.println("Starting StepperTest");
+  digitalWrite(ledPin, LOW);
+  
+  delay(2000);
+
+  pinMode(directionPin, OUTPUT);
+  pinMode(stepPin, OUTPUT);
+  pinMode(ledPin, OUTPUT);
+  
+ 
+  digitalWrite(directionPin, HIGH);
+  for(int n = 0; n < numberOfSteps; n++) {
+    digitalWrite(stepPin, HIGH);
+    delayMicroseconds(pulseWidthMicros); // this line is probably unnecessary
+    digitalWrite(stepPin, LOW);
+    
+    delay(millisbetweenSteps);
+    
+    digitalWrite(ledPin, !digitalRead(ledPin));
+  }
+  
+  delay(3000);
+  
+
+  digitalWrite(directionPin, LOW);
+  for(int n = 0; n < numberOfSteps; n++) {
+    digitalWrite(stepPin, HIGH);
+    // delayMicroseconds(pulseWidthMicros); // probably not needed
+    digitalWrite(stepPin, LOW);
+    
+    delay(millisbetweenSteps);
+    
+    digitalWrite(ledPin, !digitalRead(ledPin));
+  }
+}
+
+void loop() {
+}