a4988 examples

Example code for the A4988 in CircuitPython and Arduino

A4988_Examples/Arduino_A4988/Arduino_A4988.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+const int DIR = 5;
+const int STEP = 6;
+const int microMode = 16; // microstep mode, default is 1/16 so 16; ex: 1/4 would be 4
+// full rotation * microstep divider
+const int steps = 200 * microMode;
+
+void setup()
+{
+  // setup step and dir pins as outputs
+  pinMode(STEP, OUTPUT);
+  pinMode(DIR, OUTPUT);
+}
+
+void loop()
+{
+  // change direction every loop
+  digitalWrite(DIR, !digitalRead(DIR));
+  // toggle STEP to move
+  for(int x = 0; x < steps; x++)
+  {
+    digitalWrite(STEP, HIGH);
+    delay(2);
+    digitalWrite(STEP, LOW);
+    delay(2);
+  }
+  delay(1000); // 1 second delay
+}

A4988_Examples/CircuitPython_A4988/code.py

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+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from digitalio import DigitalInOut, Direction
+
+# direction and step pins as outputs
+DIR = DigitalInOut(board.D5)
+DIR.direction = Direction.OUTPUT
+STEP = DigitalInOut(board.D6)
+STEP.direction = Direction.OUTPUT
+
+# microstep mode, default is 1/16 so 16
+# another ex: 1/4 microstep would be 4
+microMode = 16
+# full rotation multiplied by the microstep divider
+steps = 200 * microMode
+
+while True:
+    # change direction every loop
+    DIR.value = not DIR.value
+    # toggle STEP pin to move the motor
+    for i in range(steps):
+        STEP.value = True
+        time.sleep(0.001)
+        STEP.value = False
+        time.sleep(0.001)
+    print("rotated! now reverse")
+    # 1 second delay before starting again
+    time.sleep(1)