Considerations for Arduino CNC shiled and DRV8825 drive boards

First description Hardware: 1) Arduino CNC shiled V2.6

2) DRV8825 Drive Board

3) optical Drive stepper Motor

4) Arduino Uno R3

The protagonist is the Arduino CNC shiled and DRV8825 Drive board.

Here's a sandwich chart.

Information about the Arduino CNC shiled

Note the point :

1) More easily overlooked is the stepper motor interface, which is the figure on the motor socket (A1A2B1B2), a1a2 a group, b1b2 a group. How to correspond with stepper motor continue to look down

2) on the left icon out of the location of the En and GND, DRV8825 Drive plate plug anti but will burn plate OH.

3) M0 M1 M2 is a subdivision jumper. Specifically how to please bear Nobuko down to see ...

4) requires 12V supplemental power, it is not enough to rely on Uno USB or 9V battery power.

5) The other interface on the right is not used in the combination of sandwiches.

Here is the focus of this note is the DRV8825 drive board

This is a wiring diagram of no great use, mainly to explain how a1a2b1b2 is connected to the stepper motor. It is clear from the diagram that the two wires of the motor conduction are in the same group.

More prone to the problem is the drive current DRV8825 the default drive current is very large to reach about 2.5A, far from the conventional stepper motor can resist the live. The drive current of the optical drive stepper motor is 500mA.

So you must adjust the drive current before use. The adjustment method is as follows:

Drive Current algorithm: i = Vref x 2, Potentiometer has three pins, test voltage for 8825-direction pin is vref with multimeter

(The positive and negative polarity of the multimeter, the positive pole can be directly connected to the adjustable metal turntable and the 8825-direction-oriented pin is the same)

(This image corrects the ambiguities on the web, erasing the disturbing information)

Below is a breakdown of the detailed setup diagram

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Considerations for the Arduino CNC shiled and DRV8825 driver boards