Es conocido con el nombre de "Pololus" o "controlador Pololu". Conclusion. Installation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-,. Typically sold with small geared steppers this requires four digital pins and the Arduino sketch needs to directly drive each coil. Order today, ships today. As. Easy to use and quick to get started. The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. The voltage fed to the Analog pin of ESP8266 can be used as a reference voltage to control the speed of the Stepper Motor. It operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling). DMOS Microstepping Driver with Translator and Overcurrent Protection A4988_V4 388Kb / 20P: DMOS Microstepping Driver with Translator And Overcurrent Protection Search Partnumber : Start with "A4988"-Total : 57 ( 1/3 Page) Allegro MicroSystems: A4988SET-T: 1Mb / 39P: BIPOLAR STEPPING MOTOR DRIVER ICHarga Nema17 stepper motor driver expansion board DRV8825 A4988 Arduino UNO. The stepper motor is small in size and with a large speed reducer (1: 64) so that very fine control of the rotation angle is possible. MG90S Datasheet. 00. The board has a simple step and direction control interface and five different step. This situation begs for some interesting questions: is it worth getting DRV8825. Have a motor power supply that can deliver that current. Datasheet search engine for Electronic Components and Semiconductors. It is intended to do the same job that the A4988 does. It consists of a pair of H-bridges and some extra drive logic to provide a simple GPIO interface. The 3-5V input MUST be powered unless you modify the board jumper to use the 3V internal. I’m also aware that I need to make sure I power the drivers in parallel from this source, and not. e. Minimum operating voltage: 8 V. 5mm mm. The code basically sets the direction of the motor with one pin, and writes high then low on the step pin to move the motor one step. 48. The driver features adjustable current limiting, overcurrent protection, and five different microstep resolutions. The A4988 is a bipolar stepper driver. 5a with cooling. Robin2 November 8, 2014, 12:54pm 1. The MS1 and MS2 pins must be pulled high in order for the TMC2208 driver to provide 256 subdivision effects. A4988 Stepper Motor Driver Pinout. Previous. 5 amp motor I would be looking for a driver than can provide 5 amps. When you send the servo a signal with a pulse width of 1. 8° step angle (200 steps/revolution). (see Allegro website for datasheet) This library diverges from others that are around, in that it assumes that the MS1, MS2, and MS3 pins are connected to gpio pins on the Arduino, allowing control over. :~ I started building one project for which i need to use Stepper motors. Description. 1. See moreThe A4988 stepper motor driver has an output drive capacity of up to 35V and ±2A. Im using the driver A4988 together with stepper 28byj-48. The Vref is set to. 8 degrees per step). What I am trying to accomplish is to allow for a stepper motor, (powered by an A4988 driver) to move with the push of a button. Servo motors are controlled by sending a PWM (pulse-width modulation) signal to the signal line of the servo. We’re now getting a sound level of around 45 decibels, but it’s still way louder than the TMC2208 drivers. g. 8 x 1 = 2. 5 A – – 1. The "TasmotaSmartCatFeeder" circuit consists of a WeMos D1 mini, an A4988 controller, and two power supplies (5V&12V). The schematic diagram below shows how the connection for Arduino UNO, A4988 Stepper motor driver and the stepper motor is done. The DRV8825 would be a more suitable driver for your motor if you need the full torque. Thanks, Brandon. Question: a) Do datasheet calculation for a step motor. 508. Then, continue by connecting the capacitor and resistors to the 555 timer IC. 3 volt I will use 5v for the esp32 power supply and 12 volt for the stepper motor supply. 2- Software: 2. Supported drivers are A4988, DRV8824, DRV8825, DRV8834, DRV8880. Allegro MicroSystems, LLC. A4988. This library was tested with a typical bipolar NEMA-11 stepper motor with four wires: should work with any similar type motor. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. This breakout board for TI’s DRV8825 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and six microstep resolutions (down to 1/32-step). DMOS Microstepping Driver with Translator And Overcurrent Protection A4988 Allegro MicroSystems, LLC 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. 8 Rated Voltage: 2. Otra ventaja que nos proporciona. Control steppers via a driver board providing STEP+DIR like the ones from Pololu. Posts: 182. 3 volt I will use 5v for the esp32 power supply and 12 volt for the stepper motor supply. Full-step, half-step, quarter-step, eighth-step, and sixteenth-step resolutions. 1. RESET and SLEEP are connected together. Allegro's A4982 / A4984 / A4985 and A4988 devices are complete microstepping motor drivers with a built-in translator for easy operation and overcurrent protection. It operates from 8 – 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air. 5 A per phase without a heat sink or forced air flow (rated for up to 2. 508. 1- three NEMA17 stepper motors. 3V V 35V V 4 4. The circuit was put together along with the RPi GPIO. I was wondering if it's possible to first, set up a voltage divider. Sin embargo, a diferencia de controladores más simples como el L298N o el TB6612FNG,. Como calibrar el driver A4988 ajustando el Voltaje de referencia Vref de forma correcta para que no pierda pasos, conexión de la CNC Shield a los motores de. This breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions (down to 1/16-step). 00. I have been trying to follow this tutorial: Besides the NEMA 17, Arduino UNO, and A4998 stepper, I'm also using the following 12V 2A power supply: However, I have been unsuccessful in getting any movement out of the stepper. Does anyone know where I can find one or how to make one please ? Cordially. 8 degrees per step). So i bought Nema 17 stepper motor, Arduino Mega and the stepper motor driver a4988. 2- three A4988 Stepper drivers. 96V and I checked it from the + probe on the turnpot and - on a. Kidlin's Law -If you can write the problem down clearly then the matter is half solved. Designing the Micro_step driver "A4988" for the stepper motors in proteus. Je reprends les gran. 500. 2. 04/Item) Get it as soon as Thursday, Nov 16El driver tiene una capacidad de salida máxima de 35 V y ± 2 A, lo que es ideal para accionar motores paso a paso de tamaño pequeño o mediano, como un motor paso a paso bipolar NEMA 17. 0 and establishes how much current is used by the stepper motors when they are not moving, i. It is. This device contains two sinusoidal DACs that. Control Input Pins: STEP & DIR are the 2 control input pins. How the code works: The first step is to include the library with #include . Minimum logic voltage: 3 V. A4988 is a complete microstepping motor driver with built-in translator for easy operation. It can be a window, door, shutter, cat or dog flap, a. Our Black Edition A4988 stepper motor driver carrier is a higher-performance drop-in replacement for the original A4988 stepper motor driver carrier. The headers can be soldered in for use with solderless breadboards or 0. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. I have so far tested with a few stepping motors (uni- / bipolar) + L298N driver / ULN2003 Driver and everything always worked without problems. S. 8 degrees per step). The nRF24L01 module is very popular choice for wireless communication. ASCOM driver tested with FocusMax, Nebulosity 4. The driver features adjustable current limiting, overcurrent protection, and five different microstep resolutions. For a 3. Find more details, circuit schematics and sourc. 4. OVERVIEW Following in the foot steps of our last tutorial, we will now see how to achieve the same results using the popular “AccelStepper” library. This product ships with all surface-mount components—including the A4988 driver IC—installed as shown in the product picture. If you haven’t tuned your motor current at all, it may happen that the motor doesn’t move correctly and starts pulsating, it will stop as soon as you reduce the current by rotating the pot. 5 A – 320 430 mΩ Sink driver, I OUT = 1. 620-1343-1. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. MorganS May 13, 2016, 4:25am 2. I am trying to make a motorized window blinds using a 12V 28BYJ-48 stepper motor, Wemos D1 mini and A4988 driver. FORIOT 8pcs A4988 Stepper Motor Driver Module with Heat Sink Compatible with Stepstick Stepper for 3D Printer Reprap，Red. This input turns on or off all of the FET outputs. // Include the AccelStepper library: #include. Problem: I can not drive the motors with A4998 and DRV8825 but with EasyDriver4. Logic Input (V) 3 ~ 5. The driver has a STEP pin, which causes the motor to step when it goes from low to high, and a DIR pin that sets the direction. The shield came with A4988 stepper drivers and I got them to work fine, however the motors were much louder than intended so I went searching for another driver and found the TMC2208. Using the driver Minimal wiring diagram for connecting a microcontroller to an A4988 stepper motor driver carrier (full-step mode). Python Dependencies. DMOS Microstepping Driver with Translator and Overcurrent Protection. The document explains how to use the board, how to configure the microstep resolution, how to set the current limit, and how to interface with. The driver requires a logic supply voltage (3 – 5. Some DRV8825's can now be had for as low as $1. It also has pins M1-M3 to set the microstepping mode. 0. 35 V) than the A4988, allowing it to operate at higher voltages safely while lowering the possibility of LC voltage spike damage. 概要 今回はArduinoUNOとA4988の組み合わで行ってみます。 L6470はこちら >>ArduinoとL6470でステッピングモーターを回転. 499 only at Robu. 49. 0 changes the normal run current from 0-100%. Device Operation. 5 mH Holding Torque: 12. It can drive almost any bipolar stepper motor and can deliver up to 2 Amperes of current per coil. Be aware that the DRV8825 has the potentiometer. 2 v the noise goes away. The document explains how to use the board, how to configure the microstep resolution, how to set the current limit, and how to interface with different types of stepper motors. So, the Buck converter is also called the step-down converter or step. AA4998 (American Airlines) - Live flight status, scheduled flights, flight arrival and departure times, flight tracks and playback, flight route and airport. Should be fun, good luck!Here is a sample code using the MobaTools stepper library. I have included it in response to several. 15 v. 2 V. Each BigEasyDriver (BED) can drive up to about 2A per phase of a bi-polar stepper motor. Here are the steps: Plug the driver into the 3D printer board (beware the driver orientation, it is different for the A4988 and the DRV8825 stepsticks. STEP pin is used to control the steps while DIRECTION pin is used to control the. The DevMo 5 piece Stepstick Mute stepper motor driver is a great choice for anyone concerned about the heat levels produced from their 3D printer. Hi I have been working with both the Stepper NEMA 17 - DRIVER A4988 to move some gears and stuff, first everything work perfectly just by connecting everything with my Arduino UNO as I power both my Arduino and my Stepper with two 9V batteries, lately my project stopped working and I'm trying to figure out was wrong so. Connect 8-35V external power supply with VMOT and common ground. The A4988 includes a fixed off-time current regulator which has the ability. 00 for 2 item (s) Well, right now a set of five Made in China A4988 stepper driver boards goes for around $6. Bước 1: Tải xuống file zip thư viện Proteus chẳng hạn như Thư viện ARDUINO Proteus. The driver operates at 4. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. Allowable continuous current per phase without. The picture shows the connection of A4988 motor drivers and Arduino CNC Shield V3. So, after this adjustment and measuring it with the multimeter I connected the motor to the driver (Red wire to 2A, Blue wire to 2B, Green wire to 1A, Black to 1B). The product can be full, half, 1/4, 1/8 and 1/16 step mode to operate bipolar stepper motor output drive capacity of up to 35 V and ± 2 A. Description. SnapMagic Search is a free library of symbols & footprints for the A4988 STEPPER MOTOR DRIVER CARRIER by Pololu and for millions of electronic components. The national American Airlines flight AA4998 / AAL4998 departs from Los Angeles [LAX], United States and flies to Denver City [DEN], United States. 800×800 76. The HBot was controlled with two NEMA 17 stepper motors, each driven with an A4998 stepper driver circuit. 620-1343-1. 5V. NextPCB offers first 2-layer 100 X 100 mm PCB with 0$ : PCB - 12$ : am using an A4988 Stepper Motor Driver, which is controlled with an STM32F767ZI on a Nucleo 144 board. Make sure to set the max current on the driver board to the motor limit (see below). . In this video we will go over how to use the A4988 Stepper Motor Controller with Arduino UNO and NodeMCU. It has two voltage regulators (5 V and 3. 2. ALLALLA4988SETTR-T. Manufacturer: Creality; Model: Ender 3 PRO; Motherboard: V4. 12. I could have used TMC2208s but @mcdanlj convinced it was worth the couple extra $ per. 853. I’ve got my 2 steppers connected to the same A4988 driver board (coils reversed so they spin in opposite directions) with the DIR pin connected to +5V (since the direction is constant). Power connections. It is getting very hot and stops to work. 22 – US$ 12. Uno, with four stepper motor drivers A4998 to drive NEMA 17 stepper motors for each of the three axes, was used. The next step is to define the DRV8825 to Arduino connections and the motor interface type. 3V and 5V logic supply. The STEP and DIR pins are connected to Arduino digital pins 3 and 2 respectively. Maximum current: 1A (continuous), 2A (peak) Works with 3. 5000; Device Operation. IDX. El Driver A4988 es pin-compatible. . This L298N Motor Driver Module is a high power motor driver module for driving DC and Stepper Motors. It has 200 steps per revolution, and can operate at at 60 RPM. Device Operation. Product details. 5 A – – 1. Downloads. Im using the driver A4988 together with stepper 28byj-48. A4988 Product details. #include <MobaTools. That library is not compatible with the A4988. They are designed to operate bipolar stepper motors in full-, half-, quarter-, eighth- and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. Hello, I am experimenting with a stepper motor NEMA23 with the following specifications: Rated current: 2. 6 kg/cm Rotor Inertia: 300 g/cm2. 8 Rated Voltage: 2. 5. DanClemmensen December 3, 2015, 12:10am #3. It can drive almost any bipolar stepper motor and can deliver up to 2 Amperes of current per coil. I plan to control them with raspberry pi 3B+. However if I feed it with 12 v there is a high frequence noise that wont go away untill I turn my powersupply down to around 9 v. For the complete blog post visit: achieved this by using a Dasduino and a stepper motor with the associated A4988 driver. Launch the Arduino IDE. This breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions (down to 1/16-step). The key features are: This driver has 200 steps per revolution in full step (1. L298N Module Pinout ConfigurationDownload & import into your project to replace old schemaitc. This product: A4988 – Stepper Motor Driver - EGP 70. ここでは Arduino UNO R3 (互換ボード) とステッピングモータードライバモジュール A4988 を用いて、ステッピングモーター (17HS2408) を制御する方法について、簡単に説明します。. 1" male header. 2. 0 out of 5 stars 1. Each pulse represents a step (or micro-step) taken by the stepper. Pololu-2128. 14. These drivers are used to drive NEMA 17 motors on the Mill One. Select the file ending in "_pkg. 75 Volts and 28 DC. This module is based upon the HR4988 stepper motor driver and is ideal for use in 3D printer, CNC, and other applications where precise control of a stepper motor is required. It operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient. CNC Shield digunakan sebagai papan pengendali driver A4998. This allows you to control a bipolar stepper motor, such as the NEMA 17, at up to 2A output. First of all, download Arduino Library for Proteus by clicking the below button: Arduino Library for Proteus. DMOS Microstepping Driver with Translator And Overcurrent Protection A4988 Allegro MicroSystems, LLC 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. A4988 Stepper Motor Driver Carrier. The motor works with a low voltage that it receives from Dasduino, and no additional power supply is required. Power connections The driver requires a logic supply voltage (3 – 5. When current is too low, there might not be enough power and steps get lost. This i pretty much my setup but instead of 3. 4. The stepper motor driver based on the Allegro A4988 (also A4983) has a lot of problems with temperature. The TMC2208 drives the stepper motors completely silently, which is really impressive. 36V to drive 1. Compatible with 3. 5 × 5 × 4 cm. A4988 includes a fixed off-time current regulator, the regulator can slow or mixed decay mode. After setting the microstep jumper, you can plug-in A4988 driver boards as shown in the photo below. 4. kevin August 5, 2011, 2:08am #2. It’s important to check which direction you insert the driver. 75 Volts and 28 DC. It defaults to 16 step microstepping mode. The A4988 driver is a versatile stepper driver for controlling stepper motors for various applications. First I set the driver voltage to 12v (since Imax = Vref/(8Rs); Vref=1. The driver features adjustable current limiting, overcurrent and overtemperature protection, and five different microstep resolutions (down to 1/16-step). Import package. A4988 Stepper Motor Driver Module The A4988 stepper motor driver carrier is a breakout board for Allegro’s A4988 micro-stepping bipolar stepper motor driver. The stepper motor uses a stepping motor to make the spindle engrave faster. RESET and SLEEP are connected together. 508. These boards use the Allegro a4988 stepper motor driver IC. There is a built in translator which allows only two pins from the. Please see the A4988 Stepper Motor Driver Carrier product page for more information about the driver. 1. TEQStone A4988 Stepper Motor Driver with Heat Sink and Plug 5 Pack for 3D Printer, CNC Machine, Laser Engraver and Robotic Arm. O chip A4988 possui duas pontes H com transistores FET DMOS para fazer o controle de motores de passo Bipolares. 5000; 4988-DS Functional Description Device Operation. 1. The problem is, I cannot adjust the A4988 to get. After downloading the Proteus library zip file, unzip it and you will get two files in it. FREE delivery. A4988 driver:. For controlling it we are using an Arduino UNO board in combination with a CNC shield and two DRV8825 stepper drivers. 1. And it is difficult to set up with the potentiometer. Each phase draws 1. This unit comes pre-soldered with the header pins and. Here is the link to official shop, includes motor specs. 620-1343-2. You could also look into our DRV8825 Stepper Motor Driver Carrier, High Current, which is similar to the A4988 carriers in many ways, but can handle around 1. . Excellent, thanks Jim! RossW October 13, 2015, 1:02am #4. 00. You still need to honor the minimum voltage requirements of the driver that you choose. Pricing and Availability on millions of electronic components from Digi-Key Electronics. 5 V. The driver has a maximum output capacity of 35 V and ± 2 A. DMOS Microstepping Driver with Translator And Overcurrent Protection A4988 Allegro MicroSystems, LLC 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. NEMA 17 Stepper Motor Pinout. This breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions (down to. 1. 80, whereas a similar set of five Made in China DRV8825 stepper driver boards is available for around $10. The Devo model runs at a temperature of 70 degrees. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. Clear. 5 Inductance/Phase: 2. Using the driver Minimal wiring diagram for connecting a microcontroller to an A4988 stepper motor driver carrier (full-step mode). 1. Ive read somewhere that the correct current limit on 28byj-48 is somewhere between 0. The A4988 motor controller is the micro-stepping driver for controlling the Bipolar Stepper motor. Description. Depending on the manufacturer, the other dimensions of the motor may change, but the faceplate dimensions remains same. The driver requires a logic supply voltage (3 – 5. Thermal-shutdown circuit system. (So if your motor is 200 full steps per revolution, you would get 3200 steps/rev using the Big Easy Driver. The A4988 stepper driver is for Pololu stepper driver boards and compatible clones. 25. Keep the red wire and connector for the next step !5. CNC Shield V3 and step motor controls. The A4988 driver allows for versatile operation of the motor, while the ESP8266 enables remote control over WiFi. The A4988 is a complete Microstepping Motor Driver with built-in translator for easy operation. I am using the A4988 and will like to know if there is anyway of detecting that the A4988 is driving the stepper motor to the maximum or minimum stop position. 4 Overcurrent protection (OCP) is tested at TA = 25°C in a restricted range and guaranteed by characterization. and Overcurrent Protection. Each BigEasyDriver (BED) can drive up to about 2A per phase of a bi-polar stepper motor. In conclusion, the NEMA17 stepper motor, combined with the A4988 driver and the ESP8266 WiFi module, offers a powerful and flexible solution for precise motor control in applications such as 3D printing and robotics. A4988 Driver jar is located in target/A4988Driver-VERSION. 1" female connectors. 1" female connectors. A4998 parts, chip, ic,. The motor will run five revolutions back and forth with a speed of 200 steps per second and an acceleration of 50 steps/second 2. This stepper motor driver lets you control one bipolar stepper motor at up to 2 A output current per coil. 3. I also connected the voltage of 5V (pins 4 y 6) and 12 v after transform it. It has many advantages including adjustable current limiting, over temperature and over current protection. A4988 Stepper Motor Driver is a carrier board or breakout board for Allegro’s A4988 DMOS Microstepping Driver with current limiting and overcurrent protection. Hello, To test one of your A4988 boards, you can just hook it up with some minimal connections and then measure the voltages on the motor outputs. Take a look at this example for the basics of how a A4998 controls a stepper and how you wire it up: How To Mechatronics – 16 Aug 15This stepper motor driver is made of high quality aluminum material, strong and durable. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. NEMA 17 is a hybrid stepping motor with a 1. S. 2. The spec configurations have been. EGP 115. DMOS Microstepping Driver with Translator and Overcurrent Protection A4988_V4 388Kb / 20P: DMOS Microstepping Driver with Translator And Overcurrent Protection Search Partnumber : Start with "A4988"-Total : 57 ( 1/3 Page) Allegro MicroSystems: A4988SET-T: 1Mb / 39P: BIPOLAR STEPPING MOTOR DRIVER ICBasic. 2. Some DRV8825's can now be had for as low as $1. It operates from 8. Im using the driver A4988 together with stepper 28byj-48. So, Vref should be (1. 2A with 2A peak current. DMOS Microstepping Driver with Translator and Overcurrent Protection A4988 7 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U. 5- A 24V 10Amp Power supply. Ive read somewhere that the correct current limit on 28byj-48 is somewhere between 0. Rp11. But when I connect the driver and measure the voltage between the motor GND and the motor outputs, I get. 3 VERR = [ (VREF/8) – VSENSE] / (VREF/8). I am starting to use the driver A4988, typically used for NEMA 17 motors and many others. A4988 Driver Tutorial How to Use ENABLE, SLEEP, and RESET Pins for Stepper Motor Control#a4988 #stepper #pinoutThe A4988 stepper motor driver is a DMOS micro-stepping driver with converter and over current protection that operates bipolar stepper motors in full, half, quarter, 1/8 and 1/16 step modes for output drive performance Up to 35 V and ±2, the A4988 includes a fixed off-time current regulator that operates in slow or mixed-fade mode. 7 out of 5 stars 178. Stepper Motor interfacing with PC16F877A microcontroller. In this tutorial we will learn how to control a Stepper Motor using the A4988 Stepper Driver. All this time I observed that the driver got hot quite a lot and that's it. 1. You can use the TB6600. Like our original carrier, the Black Edition. 1 Features and working principle of A4988 1. What you do need to look out for is when you replace stepper drivers is whether the micro stepping jumper settings on the board are correct for your stepper driver! I needed to set the jumper switches in a certain position to enable the 1/32 micro stepping functionality for the DRV8825 drivers. Hello, I am using a NEMA 17 stepper motor and A4988 driver according to the following tutorial: Everything seems to work relatively well. The code I am using is: /* Simple Stepper Motor Control Exaple Code * * by Dejan Nedelkovski,. A stepper motor driver usually accepts a step and direction signal as inputs. If the delay between steps is more than 10us the ISR will take only a few nano. Step 2: Follow the Circuit Diagram and Set Up Everything. The A4988 includes a fixed off-time current regulator which has the ability to operate. An Arduino controls the stepping sequence. 5 A – 320 430 mΩ Sink Driver, IOUT = 1. A4988 / Drv8825 – Stepper Motor Driver Expansion Board - EGP 45. 5mm mm . 8A/phase Resistance/Phase: 0. 853. acroscene February 23, 2022, 11:11am 1. Only by two pins, you can control the rotation direction and rotation steps. This IC has seven Darlington transistor drivers and is used for high current torque motors. 3V and 5V signals.