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--- projects:cnc:4th_axis [2025/04/14 23:54] – [Arduino software using the FastAccelStepper library] admin
+++ projects:cnc:4th_axis [2025/04/15 00:07] (current) – [A manual controller for a spindle motor] admin
@@ Line 4: / Line 4: @@
 Movement control is done using a potentiometer and button. With the potentiometer the speed and direction can be set, while the button allows to rotate at a specific angle, after which the motor stops.
-After powering up, it is required to either rotate the potentiometer to the center position (speed: 0) or press the button to rotate exactly 90 degrees. This is done to make sure that the spindle initially only rotates, when the user explicitly acknowledges. Afterwards the button can be pressed at any moment to rotate another 90 degrees angle further. While the stepper motor is in pause state, to commence moving at a certain speed, it is necessary to first move the potentiometer to the center position from which the direction and speed can than be set accordingly.
+After powering up, it is required to either rotate the potentiometer to the center position (speed: 0) or press the button to rotate exactly a configured amount of degrees. This is done to make sure that the spindle initially only rotates, when the user explicitly acknowledges. Afterwards the button can be pressed at any moment to rotate the same amount of degrees further. A BCD-switch is used to configure the angle. While the stepper motor is in pause state, to commence moving at a certain speed, it is necessary to first move the potentiometer to the center position from which the direction and speed can than be set accordingly.
 Project summary:
-  * Code runs on an arduino (nano).
+  * Code runs on an arduino Nano V3.0.
   * Connected to an [[https://www.mechapro.de/shop/Schrittmotor-Steuerungen/Einzelachsen-Takt-Richtung-offene-Bauform/HP-Step-pro-1-Kanal-4A-Mikroschritt-Endstufe::135.html|HP-Step.pro stepper controller]].
   * With a 4k7 potentiometer on A0, direction and speed can be set.
-  * When using a button on D8 (to GND), the axis rotates certain degrees (currently hard-coded as 90 degrees) in the direction it was rotating previously and stops afterwards, regardless of the potentiometer setting.
+  * When using a button on D8 (to GND), the axis rotates certain degrees (which can be configured with a BCD switch) in the direction it was rotating previously and stops afterwards, regardless of the potentiometer setting.
   * To start motor movement, either press the switch, or move the potentiometer to the center position, after which the motor will rotate continuously when moving the potentiometer any further.
-  * If the indicator led is blinking fast, it will indicate that the potentiometer need to be positioned at the center first. This is to prevent any unwanted motor rotation.
+  * If the indicator led is blinking fast, it will indicate that the potentiometer need to be positioned at the center first. This is to prevent any motor rotation you probably do not want.
+  * As a latest addition, a 2-digit BCD-switch is connected to inputs A1-A5,D2,D3,D10 with the common of the switches to ground. With this switches the rotation angle can be set. The arduino internal pull-up is used at these ports, so no additional resistors are required.
 The documentation of the stepper controller can be found here: [[https://www.mechapro.de/pdf/hpsteppro_doku_2016_04.pdf | hpsteppro_doku_2016_04.pdf]]
@@ Line 24: / Line 25: @@
 | CN4,5  | /Off  | Power off stepper drivers  |  5  |
 | CN4,6  | /Sleep  | Reduces motor current to 25% from nominal during low state  |  6  |
-| CN4,7 + CN4,8  | +5v  | This pin is not connected but rewired to the internal 5v supply of the stepper controller and used to power the Arduino nano standalone  |  +5v  |
+| CN4,7 + CN4,8  | +5v  | This pin was originally not connected (NC) and now repurposed to power the arduino controller from the internal 5v supply of the stepper controller  |  +5v  |
 | CN4,9 + CN4,10  | GND  | Ground  |  GND  |
 | CN7.5  | /Reset  | Reset  |  13  |
@@ Line 76: / Line 77: @@
 const uint8_t rot_pin =  8; // connect a button (switch to ground) to rotate (90) degrees
-// 2-digit bcd-wheel to set angle. Common is connected to ground
+// 2-digit bcd-wheel to set rotation angle. Common is connected to ground
 const uint8_t bcd10 = PIN_A1;
 const uint8_t bcd20 = PIN_A2;

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