Big Easy Driver 2A 大功率轉譯型步進馬達驅動板 Sparkfun 原裝進口

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Big Easy Driver 2A 大功率轉譯型步進馬達驅動板 Sparkfun 原裝進口

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Big Easy Driver 2A 大功率轉譯型步進馬達驅動板 Sparkfun 原裝進口

Big Easy Driver 2A 大功率轉譯型步進馬達驅動板可以驅動雙相步進電機每相最多2A。它是一個斬波器微步進驅動器,默認為16步微步進模式。它可以承受大約30V的最大電機驅動電壓,並且包括板上5V / 3.3V調節,因此只需要一個電源。儘管在1.4-1.7A /相工作的情況下,該電路板應能夠運行大多數係統,而不需要主動冷卻,但對於接近2A /相的負載,需要加裝散熱片。

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商品說明

Big Easy Driver 2A 大功率轉譯型步進馬達驅動板 Sparkfun 原裝進口

Big Easy Driver 2A 大功率轉譯型步進馬達驅動板可以驅動雙相步進電機每相最多2A。它是一個斬波器微步進驅動器,默認為16步微步進模式。它可以承受大約30V的最大電機驅動電壓,並且包括板上5V / 3.3V調節,因此只需要一個電源。儘管在1.4-1.7A /相工作的情況下,該電路板應能夠運行大多數係統,而不需要主動冷卻,但對於接近2A /相的負載,需要加裝散熱片。

原廠使用教學 https://learn.sparkfun.com/tutorials/big-easy-driver-hookup-guide

Introduction

The Big Easy Driver gives you the capability to drive stepper motors that pull up to 2A/phase. This driver defaults to 16 step microstepping mode, and gives you control of motor speed and location.

Big Easy Driver 2A 大功率轉譯型步進馬達驅動板

 

Hardware Overview

The Big Easy Driver is designed around the Allegro A4988 motor driver. Each pin present on the board has two connection points. The first, which are the pins closest to the center of the board, are spaced out to fit standard 0.1″ headers. The secondary connection points are closest to the edge of the board, and are spaced to fit 2-pin screw terminals. You can use whichever pin connections work best for your project. Functionality between the two sets does not change.

Pin Descriptions

Several pins of the A4988 IC are broken out on the Big Easy Driver, allowing direct connection to a bi-polar stepper motor, as well as a microcontroller.

Board Top Pins

  • Coil A+: DMOS Full Bridge 1 Output B. Half of connection point for bi-polar stepper motor coil A.
  • Coil A-: DMOS Full Bridge 1 Output A. Other half of connection point for bi-polar stepper motor coil A.
  • Coil B+: DMOS Full Bridge 2 Output B. Half of connection point for bi-polar stepper motor coil B.
  • Coil B-: DMOS Full Bridge 2 Output A. Other half of connection point for bi-polar stepper motor coil B.
  • GND: Ground.
  • M+: Power supply. 8V – 35V.

Top Pins

Bottom Pins

  • ENABLE: Logic Input. Enables the FET functionality within the motor driver. If set to HIGH, the FETs will be disabled, and the IC will not drive the motor. If set to LOW, all FETs will be enabled, allowing motor control.
  • MS1: Logic Input. Microstep Select 1 has a pull-up resistance of 20 kOhms. See truth table below for HIGH/LOW functionality.
  • MS2: Logic Input. Microstep Select 2 has a pull-up resistance of 20 kOhms. See truth table below for HIGH/LOW functionality.
  • MS3: Logic Input. Microstep Select 3 has a pull-up resistance of 20 kOhms. See truth table below for HIGH/LOW functionality.

Microstep Select Resolution Truth Table

MS1 MS2 MS3 Microstep Resolution Excitation Mode
L L L Full Step 2 Phase
H L L Half Step 1-2 Phase
L H L Quarter Step W1-2 Phase
H H L Eigth Step 2W1-2 Phase
H H H Sixteenth Step 4W1-2 Phase

 

  • RST: Logic Input. When set LOW, all STEP commands are ignored and all FET functionality is turned off. The translator is set to the Home state as well. This must be set HIGH to enable functionality of the motor driver.
  • SLEEP: Logic Input. When set to LOW, the A4988 enters sleep mode, and disables functionality of the FETs, internal current regulator and charge pump. When switching this pin to HIGH to wake up the IC, allow 1 ms of delay before sending a STEP signal. The IC will return the motor to the starting position upon receiving a HIGH signal on this pin.
  • VCC: Logic Supply.
  • GND: Ground.
  • STEP: Logic Input. Any transition on this pin from LOW to HIGH will trigger the motor to step forward one step. Direction and size of step is controlled by DIR and MSx pin settings.
  • DIR: Logic Input. This pin determines the direction of motor rotation. Changes in state from HIGH to LOW or LOW to HIGH only take effect on the next rising edge of the STEP command.

Bottom Pins

Solder Jumpers

There are two solder jumpers present on the board.

  • APWR – This solder jumper allows the user to use VCC as a power supply for external devices. The Big Easy Driver requires 15mA to operate, and the voltage regulator that outputs VCC can only supply 100mA. Keep this in mind when planning to power any additional devices off of VCC.
  • 5V/3.3V – This jumper allows the user to set the configuration of VCC between 3.3V or 5V. With the jumper open, VCC will be 5V. If the jumper is closed, VCC is 3.3V.

Solder Jumpers

Potentiometer

The potentiometer on board is included to allow users the ability to select the current provided to the motor. It ranges from 0mA to 2000mA (2A). This will require you to be aware what current range your motor can handle – check the motor’s data sheet for the current settings.

Potentiometer

If you can’t find this information, have no fear – you can still find the proper setting for the potentiometer. First, set it to the lowest setting of the potentiometer. Keep in mind that the potentiometer is delicate, so be careful to not force the potentiometer past the mechanical stops when turning it. Once you have the motor being driven at a slow, yet steady speed, slowly turn the potentiometer and pay attention to the motor’s behavior. You should find a sweet spot where the motor doesn’t skip or jerk between steps.

 

 

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