driver a4998. 00 for 2 item (s) Well, right now a set of five Made in China A4988 stepper driver boards goes for around $6. driver a4998

 
00 for 2 item (s) Well, right now a set of five Made in China A4988 stepper driver boards goes for around $6driver a4998  Pololu-2128

0. Robin2 November 8, 2014, 12:54pm 1. Product Description. StepperDriver. 6 kg/cm Rotor Inertia: 300 g/cm2. TB6600 Stepper Motor Driver with Arduino Tutorial The A4988 driver chip has several safety functions built-in like overcurrent, short circuit, under-voltage lockout, and over-temperature protection. TMC drivers. The voltage fed to the Analog pin of ESP8266 can be used as a reference voltage to control the speed of the Stepper Motor. The Pololu page contains a warning that it will get hot enough to burn you in normal operation. 5A8*0. The most probable things would be that the current is set to high, or your are trying to draw to many amps. 35 V) than the A4988, allowing it to operate at higher voltages safely while lowering the possibility of LC voltage spike damage. That can range from 3. 2. The SPI interface will not work unless. Overview. Can be applied in a wide range of applications, suitable for engraving machines and other. 1. We’re now getting a sound level of around 45 decibels, but it’s still way louder than the TMC2208 drivers. 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. Find more details, circuit schematics and sourc. This allows you to control a bipolar stepper motor, such as the NEMA 17, at up to 2A output. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. b) Compare step motor driver modules (1298,1293,a4998,drv8825,uln2003) c) Compare D1 and D2, write disadvangates. 8 degrees per step). 1 amp or 1. CNC Shield V3 Engraving Machine. A4988 Datasheet (PDF) - Allegro MicroSystems. La figure ci-dessous représente le courant dans les deux bobines en fonction. 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. i connected my arduino mega to my. The "TasmotaSmartCatFeeder" circuit consists of a WeMos D1 mini, an A4988 controller, and two power supplies (5V&12V). It is small, very cheap, and easily available even in remote electronics markets. 3V and 5V logic supply. As a tool it has an laser module attached so this machine is actually a CNC laser engraver. The current rating of the TMC2208 is slightly higher than the A4988 driver, or it’s 1. The A4988 stepper driver is for Pololu stepper driver boards and compatible clones. NEMA 17 Stepper Motor Pinout. I have here the datasheet of the Arduino Uno, and also the datasheet of the A4988. Im using the driver A4988 together with stepper 28byj-48. Minimum logic voltage: 3 V. 2. The A4988 Driver is very cool, as it works with. VMOT, GND: This is the stepper motor power supply pins. A direction signal directs the stepper to turn in a particular direction (CW or CCW). I am starting to use the driver A4988, typically used for NEMA 17 motors and many others. 620-1343-2. Low to high transition means to step) [in] pin2: Arduino digital pin number for motor pin 2. Klipper can also use Trinamic drivers in their "standalone mode". The Devo model runs at a temperature of 70 degrees. x you can define which stepper driver type is used to drive the stepper in the Stepper Drivers section. Stepper Motor interfacing with PC16F877A microcontroller. Product Description. When current is too low, there might not be enough power and steps get lost. It operates from 8. Big Easy Driver - A4988搭載ステッピングモータードライバ --販売終了 Allegro社のA4988チップを搭載したステッピングモータードライバです。最大35Vの電圧まで対応します。 また電源レギュレータを搭載しているので、電源はDC1系統(モーター用)で供給できます。. Pololu driver boards (8+8 pins): . 620-1343-1. 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. Onboard current-limiting adjustment potentiometer protects the module and motors. (motores com quatro, seis ou oito fios). Read more. The voltage fed to the Analog pin of ESP8266 can be used as a reference voltage to control the speed of the Stepper Motor. This stepper motor driver lets you control one bipolar stepper motor at up to approximately 1. 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. The A4988 stepper motor driver has an output drive capacity of up to 35V and ±2A. 68/0. STEP pin is used to control the steps while DIRECTION pin is used to control the. O chip A4988 possui duas pontes H com transistores FET DMOS para fazer o controle de motores de passo Bipolares. When I assemble the. 4 amps is more realistic. This unit comes pre-soldered with the header pins and. Package Dimensions ‏ : ‎ 5. So i bought Nema 17 stepper motor, Arduino Mega and the stepper motor driver a4988. The key features are: This driver has 200 steps per revolution in full step (1. The driver has a built-in translator which means it can take pulse signals from a microcontroller and convert them into the correct sequence of motor windings energization. 3 Kbytes. Hello, I am experimenting with a stepper motor NEMA23 with the following specifications: Rated current: 2. Using this Nema 17 motor driver module, we can control stepper motor by using only two pins, i. EGP 115. . 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. Defaults to pin 3. 5A without additional cooling and offers 1/32-step microstepping. As you may notice there are two power connections required for this driver. Now I have an A4988 stepper motor driver. Each signal sent by the spin step pin, the motor rotates one step. Allegro MicroSystems, LLC. 3 to 5V of the driver with both the 5V of the Arduino and with a LM2596 step down to 5V. 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. 2156-A4988SETTR-T. It uses open-source firmware on Arduino to control 4 stepper motors using 4 pieces of A4988 Stepper Motor driver breakout board, with this shield and Arduino Uno/Mega, you can build all kinds of robotics, linear motion projects or projects including. Current limit that can be set with the potentiometer. For a AccelStepper::DRIVER (interface==1), this is the Direction input the driver. A. By setting appropriate logic levels to those pins we will set the motors to at least one of the five-step resolutions. Included hardware. The A4988 stepper motor driver carrier is a breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver. Rp11. 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. 2 v the noise goes away. 25. A4988 support 1 segment, 1/2 segment, 1/4 segment, 1/8 segment, 1/16 segment. 14. You provide a step direction and an instruction to step, and it does the stepping for you. 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. The motor shield, in contrast, uses the L298D motor driver chip. The A4988 Stepper Motor Drivers and the Nema17 Bi-polar Stepper Motors are becoming very popular and this is the reason they are frequently used in CNC machine, handwriting machines, 3D printers, etc. In full step mode, the current through the coils is limited to 70% of the current limit, so to get a full step coil current of 1. Clone the a4988tester Github repository and load A4988tester. The A4988 driver allows for versatile operation of the motor, while the ESP8266 enables remote control over WiFi. It’s important to check which direction you insert the driver. The A4988 Module has a total of 16 pins that connects to the stepper motor and the Arduino, The pinout is as follows. It can drive almost any bipolar stepper motor and can deliver up to 2 Amperes of current per coil. Control steppers via a driver board providing STEP+DIR like the ones from Pololu. S. 15 v. A4998 data sheet, alldatasheet, free, databook. Details. Previous. Additional information. A4988 Stepper Motor Driver Carrier (Header Pins Soldered) This version of our A4988 Stepper Motor Driver Carrier ships with male header pins installed, so no soldering is. So, I plan to use a power source that provides at least 3A (surplus on the 2A required by the drivers) and rated at a voltage of 12V-24V to run the stepper motors. 2 board? all the other driver options seem to be present including a workaround for the TMC2225 and TMC2226 drivers where the #define of another driver is advised. VCC, GND: This is the A4988 driver module power supply pins. 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). This IC has seven Darlington transistor drivers and is used for high current torque motors. 5V. I even tried increasing the current from driver via the potentiometer on it but none of these worked. I would like to use the equivalent of an A4988 driver expansion card on fritzing, but I haven’t found one on the internet personally. The A4988 motor controller is the micro-stepping driver for controlling the Bipolar Stepper motor. 5 V) and a motor supply voltage (8 – 35 )V. h","path":"src. I could have used TMC2208s but @mcdanlj convinced it was worth the couple extra $ per. com for more Tutorials, Tips, Projects and. FREE delivery. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. The secondary connection points are closest to the edge of the board, and are spaced to fit 2-pin screw. The DM542T has more microstep settings, if you need to move your Stepper Motor very accurate, you can use the DM542T as it has up too 25 thousand microsteps which will result in 100000 Steps per Revolution. 4 amps without overheating and shutting down to protect itself. 4. 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. I am trying to make a motorized window blinds using a 12V 28BYJ-48 stepper motor, Wemos D1 mini and A4988 driver. The code I am using is: /* Simple Stepper Motor Control Exaple Code * * by Dejan Nedelkovski,. #include <MobaTools. Have a motor power supply that can deliver that current. An A4988 is good for about 1. Purchase this product now and earn 2 Robu Points! The A4988 driver Stepper Motor Driver is a complete micro-stepping motor driver with built-in converter, easy to operate. After setting the microstep jumper, you can plug-in A4988 driver boards as shown in the photo below. The driver features adjustable current limiting, overcurrent and overtemperature protection, and five different microstep resolutions (down to 1/16-step). 8 Rated Voltage: 2. Close windowThis statement is almost true (doesn't take into account voltage drops in the driver circuit), but is intended to show the minimum requirements, for the stepper motor, in order to drive it to it's rated current (using a chopper drive). stepper motor driver drv8825. This situation begs for some interesting questions: is it worth getting DRV8825. This all fits into the housing of the feeder and costs less than 50€! Virtually everything which has to be moved or rotated can be done now using these cheap components. The DRV8825 has a larger maximum supply voltage (45 V vs. 96V and I checked it from the + probe on the turnpot and - on a. DMOS Microstepping Driver with T ranslator. DMOS Microstepping Driver with Translator And Overcurrent Protection A4988 Allegro MicroSystems, LLC 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. 1. /* Example sketch to control a stepper motor with L298N motor driver, Arduino UNO and AccelStepper. 1" headers. A4988 Stepper Motor Driver - 2A Max. As. A4988. 853. Power connections The driver requires a logic supply voltage (3 – 5. The next step is to define the DRV8825 to Arduino connections and the motor interface type. Description. 2 kg-cm. The A4988 is a micro-striding driver for governing the stepper motors, it is incorporated with the interpreter (translator) for the tranquil process. Device Control A4988, DRV8825 and generic two-pin stepper motor driver library. !!! Beware of the orientation of the A4988 driver boards! You will destroy the A4988 driver board if plug-in with wrong orientation. Connection diagram. Supports simple circuit simulation. Ive read somewhere that the correct current limit on 28byj-48 is somewhere between 0. 19 ($2. . Harga Stepper Motor Driver A4988 3D Printer with Heatsink. There is no 16 subdivision calculation for the primary control MCU's pulses 4988 and 2208. Maximum logic voltage: 5. Each pin present on the board has two connection points. 22 – US$ 12. Hi, I found an other thread (from 2019) but it has become too long so was very difficult to navigate/read, hence starting a new one here. The A4988 driver is a commonly used bipolar stepper motor driver that can provide up to 2A current per coil from 8V to 35V. Previous. DMOS Microstepping Driver with T ranslator. hardware. Unfortunately, connecting all, drivers. Basado en el chip Allegro A4988. US$ 1. Unit price (US$) 5. CNC Shield V4. The A4988 stepper motor driver is intended to drive a bipolar stepper motor. Downloads. Im using the driver A4988 together with stepper 28byj-48. Hello, I am using a version of an Arduino CNC board that is found here to drive 4 wheels on a small wheeled robot. In the configuration. 4. These drivers have become. 11009. Our Black Edition A4988 stepper motor driver carrier is a higher-performance drop-in replacement for the original A4988 stepper motor driver carrier. 8A/phase Resistance/Phase: 0. Next page. Each signal sent by the spin step pin, the motor rotates one step. It defaults to 16 step microstepping mode. Ramps 1. The circuit was put together along with the RPi GPIO. A4988 is perhaps the most famous stepper motor driver which is usually sold as a complete breakout board. MG90S Datasheet. L298N Module can control up to 4 DC motors, or 2 DC motors with directional and speed control. 0. 36V to drive 1. Otherwise, if your z axis moves . 1mm when you tell it to, its not likely firmware but try to lower acceleration and speed. A4988 includes a fixed off-time current regulator, the regulator can slow or mixed decay mode. This module consists of an L298 motor driver IC and a 78M05 5V regulator. 7 by 1. 2 A. The range of 0. There’re 3 slots in the board for stepper motor drive modules, can drive 3 stepper motors, and each step stepper motor only need two IO port, that is to say, 6 IO ports can quite well to manage three stepper. Specifications: Voltage range: 8-35V. ALLALLA4988SETTR-T. To use the A4988 you just set a pin HIGH or LOW for the direction, then toggle another pin to make it step. 087mm mm 2. 4 Playlist:A4988 driver Stepper Motor Driver is a complete micro-stepping motor driver with built-in converter, easy to operate. The board has a simple step and direction control interface and five different step. OctagonStar A4988 Driver CNC Shield Expansion Board for Arduino V3 Engraver 3D Printer. It operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a. 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. 19 $ 10 . Step-By-Step Instructions To Connect The A4988 Driver Module with ESP32. It is small, very cheap, and easily available even in remote electronics markets. kevin August 5, 2011, 2:08am #2. It can. The flight number or. A4988 Description. 853. New Price: ₹ 149. Each BigEasyDriver (BED) can drive up to about 2A per phase of a bi-polar stepper motor. 99 $ 7. 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. Click to feedback >Mini Torque Driver 250 product page. 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). If this is the first time building a Voron printer (especially if this is the first 3D printer), it is strongly suggested to build 100% to spec using the documentation provided here. The SL42STH40-1684A motor specs are:Buck Converter is a dc-to-dc converter designed to perform the step down conversion of applied dc input. 000. 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). In this tutorial we will use stepper driver A4988, NEMA17 stepper motor, Arduino Uno and Visuino to run a stepper motor for a certain amount of steps. A. You can choose to use the following constants from the array to configure the correct driver: Maybe you saw it somewhere but probably you didn't spotted these details, actually the name of the "A4988 Stepper Shield" firstly invented by inventors of Polulu Robotics & Electronics when first DIY CNC Machines appear since these Stepper drivers helps to easily driver the Steppers of CNC machines but the name itself comes from the Integrated Circuit of the Shield which is the A4988 designed. This item: HiLetgo 5pcs A4988 Stepstick Stepper Motor Driver Module with Heat Sink for 3D Printer Reprap Suitable for Mendel Huxley Arduino $10. 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. units, within the specified maximum and minimum limits. The A4988 includes a fixed off-time current regulator which. 853. The A4988 Driver Module is used to control the speed and direction of stepper motors mainly used in robotics, toys, 3D printers for motion control. How to use the A4988-stepperDriver library. A ULN2003 Darlington driver board. Backorder. pdf is a document that provides detailed information about the Pololu A4988 stepper motor driver carrier, a breakout board for Allegro's A4988 microstepping driver with translator and overcurrent protection. 7amps. The A4988 driver allows for versatile operation of the motor, while the ESP8266 enables remote control. A4988 includes a fixed off-time current regulator, the regulator in slow or mixed decay modes. 00. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. Quantity: backorders allowed. Then swap the yellow and pink cable on the connector. In a buck converter, the applied fixed dc input is reduced to a specific dc output voltage i. 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. Description: MG90S servo, Metal gear with one bearing. 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. I saw that the pin-outs were the same as long as the boards themselves aligned the enable pins on the shield. IDX. Watch the video! Step 1: What You Will Need Arduino UNO (Or any other Arduino) Stepper motor NEMA 17 A4988 Stepper Motor Driver or (DRV8825). 000. Author: Laurentiu Badea Maintainer: Laurentiu Badea A4988 Stepper Motor Driver Carrier (Header Pins Soldered) This version of our A4988 Stepper Motor Driver Carrier ships with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. 100uF capacitor between GND - VMOT. I am experimenting with a stepper motor NEMA23 with the following specifications: Rated current: 2. Shop now at the lowest price in India to get free shipping on all orders above Rs. This L298N Motor Driver Module is a high power motor driver module for driving DC and Stepper Motors. Cheers. 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). It operates from 8 – 35 V and can deliver up to. DMOS Microstepping Driver with Translator and Overcurrent Protection. 15 v. We will learn about the basics of the A4988, how to. These two Proteus library zip files are named as: ArduinoTEP. The schematic diagram below shows how the connection for Arduino UNO, A4988 Stepper motor driver and the stepper motor is done. All this time I observed that the driver got hot quite a lot and that's it. 3V V 35V V 4 4. The problem however seems to be in. It is getting very hot and stops to work. First two pins are Direction and Step which are actually used to control the movement of stepper motor. The A4988 stepper motor driver carrier is a breakout board for Allegro’s A4988 microstepping bipolar stepper motor. The photo also shown this CNC sit nicely on top of Arduino Uno board, without any external jumper wires. However, the operating voltage needs to stay between 8V to. In this video we will go over how to use the A4988 Stepper Motor Controller with Arduino UNO and NodeMCU. So, the Buck converter is also called the step-down converter or step. A4988 Driver jar is located in target/A4988Driver-VERSION. 1-0. It operates from 8 – 35 V and can deliver up to 2 A per coil. We'll look at all pins and it's functioning one by one. Allegro's A4982 / A4984 / A4985 and A4988 devices are complete microstepping motor drivers with a built-in translator for easy operation and overcurrent protection. The spec configurations have been. 3D Printing. ,500VDC. The A4988 driver Stepper Motor Driver is a complete micro-stepping motor driver with built-in converter, easy to operate. TEQStone A4988 Stepper Motor Driver with Heat Sink and Plug 5 Pack for 3D Printer, CNC Machine, Laser Engraver and Robotic Arm. 853. 2 A at 4 V, allowing for a holding. 8 Rated Voltage: 2. 5a with cooling. The A4988 is a complete microstepping motor driver with a built-in translator for easy operation with minimal control lines. 1" male header. It is. The driver has a maximum output capacity of 35 V and ± 2 A. 853. Question: a) Do datasheet calculation for a step motor. The problem is, I cannot adjust the A4988 to get. We’re now getting a sound level of around 45 decibels, but it’s still way louder than the TMC2208 drivers. The Devo model runs at a temperature of 70 degrees. Be aware that the DRV8825 has the potentiometer. 19 ($2. Esse chip não pode controlar motores de passo Unipolares ! A4988 Pinout. The A4988 is a complete microstepping motor driver with built-in translator for easy operation. But when I connect the driver and measure the voltage between the motor GND and the motor outputs, I get. A4988 Stepper Motor Driver – Technical Specifications. 00. You don't really need a library for that. Control steppers via a driver board providing STEP+DIR like the ones from Pololu. This document provides information on using Trinamic stepper motor drivers in SPI/UART mode on Klipper. A. First of all, download Arduino Library for Proteus by clicking the below button: Arduino Library for Proteus. For a AccelStepper::DRIVER (interface==1), this is the Step input to the driver. Hello, I am using a NEMA 17 stepper motor and A4988 driver according to the following tutorial: Everything seems to work relatively well. This is a brand new diy board, not only does it include other stepper motors, but also some modification drives. 508. Shipping Dimensions. The driver has a maximum output capacity of 35 V and ± 2 A. The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. The ULN2003 stepper driver board is a basic a 4-pin driver board for motor coils and pins for motor pwr and gnd. 0. Keep the red wire and connector for the next step !5. 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). Compatible with Eagle, Altium, Cadence OrCad. 1,500. 1A, 1B, 2A and 2B are connected to the stepper motor coils. (So if your motor is 200 full steps per revolution, you would get 3200 steps/rev using the Big Easy Driver. Code. The frame is made of allimunium and it is designed to be very light. The motor works with a low voltage that it receives from Dasduino, and no additional power supply is required. Python Dependencies. Your motor can take 1. Shipping Weight. A4998 Stripboard A4998-Rev11-Gerbers. The A4988 is a microstepping driver for controlling bipolar stepper motors which has built-in translator for easy operation. Choose an option 1 20. , Ltd. In this section, we will build a project using ESP32 and A4988 stepper motor driver IC. 5- A 24V 10Amp Power supply. Add to wish list. Please slide to verify. A4988 Product details. and Overcurrent Protection. 3 inches; 8. 8W per motor, hence 5. Cheers. The driver features adjustable current limiting, overcurrent and over-temperature protection, and five different micro-step resolutions (down to 1/16-step). This provides, as well, two H-bridges like the A4988. Driving a 12V 28BYJ-48 Stepper With the A4988 Stepstick (in Full-step Mode). However if I adjust the current limit to around 0. e. 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. Pololu-2128. It has many advantages including adjustable current limiting, over temperature and over current protection. Cnc problem , stepper motor driver A4988 damaged. :) Cheers, Bantum. The DRV8825 has a larger maximum supply voltage (45 V vs. DMOS Microstepping Driver with Translator And Overcurrent Protection A4988 Allegro MicroSystems, LLC 7 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U. 5pcs A4988 Stepstick Stepper Motor Driver Module with Heat Sink for 3D PrinterStepper motor driver Allegro’s A4988 DMOS Micro-stepping Driver with adjustable current limiting, overcurrent and overtemperature protection, and five different micro step resolutions (down to 1/16-step). Defaults to pin 2. 1. The driver has a maximum output capacity of 35 V and ± 2 A. It should also work with any stepper driver that just needs step and direction signals from an Arduino. A4988 Stepper Motor Driver Carrier. Si necesita. First connect all the parts based on the circuit layout as shown in the image. This is a breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver. The is a complete microstepping motor driver with built-in translator for easy operation. - Điều. I have all ready re-assigned the pin outs in the sketch and tried selecting the enable option to "0" and. The national American Airlines flight AA4998 / AAL4998 departs from Los Angeles [LAX], United States and flies to Denver City [DEN], United States. I will drive multiple a4988 drivers running nema17 from esp32 using arduino IDE.