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--- projects:a4sim:servos:x27168 [2019/08/21 01:01]
dwheele [Dimensions]
+++ projects:a4sim:servos:x27168 [2020/02/22 17:07] (current)
admin ↷ Links adapted because of a move operation
@@ Line 4: / Line 4: @@
 These specs are from [[https://www.adafruit.com/product/2424|Adafruit]], who show the part as out-of-stock.
+Adafruit info:
+//This stepper motor is a little different than the large NEMA-17 types you may be used to. These are often used in gauges for motorcycles and cars to replace the old-style fully-analog type. They have extremely fine step precision of about 1/2 a degree per step, 600 steps for single stepping, fast response for quick movements, and a range of  ~315° degrees. Their smooth motion makes good for small projects that need a dial indicator, and more precision motion than you may get with a needle gauge.//
+//Since this is a bi-polar stepper motor you do need to have some sort of H-Bridge to drive it. A L293D or TB6612 will do the job nicely. If you have a microcontroller that can drive 200 ohm loads you might be able to use the direct pins without extra MOSFETs, just remember to include kickback/flyback protection diodes!//
+//Note that the motor is quite 'weak', not good for moving anything but a light indicator. We include a red-line dial that fits nicely on top by pushing onto the needle shaft.//
 ==== Specs ====
@@ Line 24: / Line 32: @@
     Motor Thickness (w/o pins): 9mm / 0.35"
-{{ :projects:a4sim:servos:2424.pdf |Data sheet for similar item}}
+{{ a4sim:servos:2424.pdf |Data sheet for similar item}}
+==== Working example ====
+<code c>
+/*
+ Stepper Motor Control - one step at a time
+ This program drives a unipolar or bipolar stepper motor.
+ The motor is attached to digital pins 8 - 11 of the Arduino.
+ The motor will step one step at a time, very slowly.  You can use this to
+ test that you've got the four wires of your stepper wired to the correct
+ pins. If wired correctly, all steps should be in the same direction.
+ Use this also to count the number of steps per revolution of your motor,
+ if you don't know it.  Then plug that number into the oneRevolution
+ example to see if you got it right.
+ Created 30 Nov. 2009
+ by Tom Igoe
+ */
+#include <Stepper.h>
+const int stepsPerRevolution = 600;  // change this to fit the number of steps per revolution
+                                     // for your motor
+// initialize the stepper library on pins 8 through 11:
+Stepper myStepper(stepsPerRevolution, 2,4,6,7);
+int stepPosition = 0;         // number of steps the motor has taken
+int stepPoints[] = {100, 300, 200, 250, 50};
+int sPtr = 0;
+void setup() {
+  // initialize the serial port:
+  // Serial.begin(19200);
+  // myStepper.step(-600);
+  // Deleted Serial writing, it might be interfering.
+  // setSpeed of 10 seems to work. Trying 30.
+  // 8/21/2019
+  myStepper.setSpeed(60);
+  stepPosition = 0;
+  int i;
+  for (i = 0;i < 600;i += 10) {
+    myStepper.step(-10);
+    delay(40);
+  }
+  delay(500);
+}
+void loop() {
+  int newLoc = stepPoints[sPtr];
+  sPtr++;
+  if (sPtr >= 5) {
+    sPtr = 0;
+  }
+  int stepAmount = newLoc - stepPosition;
+    myStepper.step(stepAmount);
+    stepPosition = newLoc;
+    delay(10);
+}
+</code>

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