Controller Module

Check out our wide range of electronics and accessories at very reasonable price here for your 3d printer and any other diy projects.
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  • SD RAMPS ()

    This SD RAMPS module for RAMPS 1.4 makes it possible to print from a Micro-SD card (not included).

    The module is completely soldered and just needs to be plugged in.

    Add to Cart
    RM25.00
  • Melzi V2.0 Controller Board of reprap 3d printer (Melzi)
    New Reprap 3D Printer Melzi v2.0 Complete Controller Board 1284P 16MHZ
    This is a Reprap Melzi Ardentissimo fullfeatured board using the ATMEGA 1284P 16MHZ (being tested) chip .

    This is a Sanguinololu firmware compatible board, it do not need the extra fan,  micro SD on board as well.

    A full  firmware is on board as well negating the need for external stepper motor drivers.

    Click here for more info on Mezli V2.0

    Specifications:

    This is a complete set of 3D printers electronic controller board

    The main chip is ATmega1284P (TWICE the memory of the inferior 644P!)

    4*Stepper Motor Driver integrated chips are  Allegro A4988

    Integrated USB chip FT232RL socket

    Integrated X/Y/Z/E step motor driver with sockets

    Integrated X/Y/Z stopping  with sockets

    integrated heatbead temperature controller with sockets

    integrated hotend temperature controller with sockets

    integrated power in sockets

    integrated micro SD card socket

    just connecting this board with USB wire into your pc, win7 can automaticly driving it,

    install control software, the 3D printer you made is well to go.

    Specifications:
    Size:L21 x W5 x H2 cm
    Net weight:100g
    Package weight:200g

    Package content:
    1x New Complete Reprap V2.0 Melzi 3D Print Controller Board
    1x USB Cable 1.5m
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    RM350.00
  • HC-06 RS232 Wireless Serial 4 Pin Bluetooth RF Transceiver Module With Backplane ()

    HC-06 RS232 Wireless Serial 4 Pin Bluetooth RF Transceiver Module With Backplane


    1, the core module using HC - 06 from module, which leads to the interface includes VCC, GND, TXD, RXD, reserved LED state output pin, MCU can state whether the bluetooth is connected through the foot, from the machine KEY pin is invalid
    2, the led indicator bluetooth connection status, twinkle said there was no bluetooth connectivity, Chang Liang said bluetooth connection and open the port
    3, 3.3 V ", as the input voltage 3.6 ~ 6 V, current about 30 ma when the unpaired, matching after about 10 ma, no more than 7 V input voltage!
    4, interface level 3.3 V, can be connected directly to a variety of single chip microcomputer (51, AVR, PIC, ARM, MSP430, etc.), 5 V microcontroller can also be connected directly, without MAX232 couldn't through MAX232.
    5, clearing the effective distance of 10 meters, more than 10 meters is possible, but not to this distance connection quality
    After 6, pairing when full duplex serial port to use, do not need to know any bluetooth protocol, but supports only one in the eight data bits, stop bits, no parity checking the communication format, which is the most commonly used communication format, does not support other formats.
    7, when the bluetooth connection has not been established support by pairing the AT command set baud rate, name, password, set the parameters of the power save. After the bluetooth connection automatically switch to passthrough mode
    8, small size (3.57 cm * 1.52 cm), SMT production factory, ensure the quality of the patch. And set transparent heat shrinkable tube, dustproof and beautiful, and there are certain antistatic ability.
    9, the link from the machine, from the function and all kinds of computer with bluetooth function, bluetooth host, with most of bluetooth mobile phone, PDA, PSP, such as intelligent terminal matching, between the machine can not match.
    The small common sense (very important) :
    TXD: sender, usually expressed as the sender, normal communication RXD must answer another equipment.
    RXD: receiving end, usually expressed as the receiver, the normal communication TXD must answer another equipment.
    When normal communication itself TXD pick up equipment RXD forever!
    Since collect spontaneous: normal communication TXD RXD connect other devices, so if you want to receive their send data as the name implies, is receiving themselves to send data, is directly connected to the RXD TXD itself, that is, used to test whether the sending and receiving of normal itself, is the most simple test method is the fastest, when problems arise first do this test to determine whether the product failure. Also known as the loopback test.
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    RM45.00
  • DRV8825 Stepper Motor Driver Carrier, High Current (DRV8825)

    This product is a carrier board or breakout board for TI’s DRV8825 stepper motor driver; we therefore recommend careful reading of the DRV8825 datasheet (1MB pdf) before using this product. This stepper motor driver lets you control one bipolar stepper motor at up to 2.2 A output current per coil (see the Power Dissipation Considerations section below for more information). Here are some of the driver’s key features:

    • Simple step and direction control interface
    • Six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step
    • Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates
    • Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)
    • 45 V maximum supply voltage
    • Built-in regulator (no external logic voltage supply needed)
    • Can interface directly with 3.3 V and 5 V systems
    • Over-temperature thermal shutdown, over-current shutdown, and under-voltage lockout
    • Short-to-ground and shorted-load protection
    • 4-layer, 2 oz copper PCB for improved heat dissipation
    • Exposed solderable ground pad below the driver IC on the bottom of the PCB
    • Module size, pinout, and interface match those of our A4988 stepper motor driver carriers in most respects (see the bottom of this page for more information)

    This product ships with all surface-mount components—including the DRV8825 driver IC—installed as shown in the product picture.

    Some unipolar stepper motors (e.g. those with six or eight leads) can be controlled by this driver as bipolar stepper motors. For more information, please see the frequently asked questions. Unipolar motors with five leads cannot be used with this driver.

    Included hardware

    The DRV8825 stepper motor driver carrier ships with one 1×16-pin breakaway 0.1" male header. The headers can be soldered in for use with solderless breadboards or 0.1" female connectors. You can also solder your motor leads and other connections directly to the board.

    Caution: Installing the header pins so that the silkscreen side is up and the components are down can limit the range of motion of the trimpot used to set the current limit. If you plan on installing the header pins in this orientation, please set the current limit before soldering in the pins.

    Using the driver

    Minimal wiring diagram for connecting a microcontroller to a DRV8824/DRV8825 stepper motor driver carrier (full-step mode).

    Power connections

    The driver requires a motor supply voltage of 8.2 – 45 V to be connected across VMOT and GND. This supply should have appropriate decoupling capacitors close to the board, and it should be capable of delivering the expected stepper motor current.

    Warning: This carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikes, especially when using power leads longer than a few inches. Under the right conditions, these spikes can exceed the 45 V maximum voltage rating for the DRV8825 and permanently damage the board, even when the motor supply voltage is as low as 12 V. One way to protect the driver from such spikes is to put a large (at least 47 µF) electrolytic capacitor across motor power (VMOT) and ground somewhere close to the board.

    Motor connections

    Four, six, and eight-wire stepper motors can be driven by the DRV8825 if they are properly connected; a FAQ answer explains the proper wirings in detail.

    Warning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver. (More generally, rewiring anything while it is powered is asking for trouble.)

    Step (and microstep) size

    Stepper motors typically have a step size specification (e.g. 1.8° or 200 steps per revolution), which applies to full steps. A microstepping driver such as the DRV8825 allows higher resolutions by allowing intermediate step locations, which are achieved by energizing the coils with intermediate current levels. For instance, driving a motor in quarter-step mode will give the 200-step-per-revolution motor 800 microsteps per revolution by using four different current levels.

    The resolution (step size) selector inputs (MODE0, MODE1, and MODE2) enable selection from the six step resolutions according to the table below. All three selector inputs have internal 100kΩ pull-down resistors, so leaving these three microstep selection pins disconnected results in full-step mode. For the microstep modes to function correctly, the current limit must be set low enough (see below) so that current limiting gets engaged. Otherwise, the intermediate current levels will not be correctly maintained, and the motor will skip microsteps.

    MODE0 MODE1 MODE2 Microstep Resolution
    Low Low Low Full step
    High Low Low Half step
    Low High Low 1/4 step
    High High Low 1/8 step
    Low Low High 1/16 step
    High Low High 1/32 step
    Low High High 1/32 step
    High High High 1/32 step

    Control inputs

    Each pulse to the STEP input corresponds to one microstep of the stepper motor in the direction selected by the DIR pin. These inputs are both pulled low by default through internal 100kΩ pull-down resistors. If you just want rotation in a single direction, you can leave DIR disconnected.

    The chip has three different inputs for controlling its power states: RESET, SLEEP, and ENBL. For details about these power states, see the datasheet. Please note that the driver pulls the SLEEP pin low through an internal 1MΩ pull-down resistor, and it pulls the RESET and ENBL pins low through internal 100kΩ pull-down resistors. These default RESET and SLEEP states are ones that prevent the driver from operating; both of these pins must be high to enable the driver (they can be connected directly to a logic “high” voltage between 2.2 and 5.25 V, or they can be dynamically controlled via connections to digital outputs of an MCU). The default state of the ENBL pin is to enable the driver, so this pin can be left disconnected.

    Schematic of nSLEEP and nFAULT pins on DRV8824/DRV8825/DRV8834 carriers.

    The DRV8825 also features a FAULT output that drives low whenever the H-bridge FETs are disabled as the result of over-current protection or thermal shutdown. The carrier board connects this pin to the SLEEP pin through a 10k resistor that acts as a FAULT pull-up whenever SLEEP is externally held high, so no external pull-up is necessary on the FAULT pin. Note that the carrier includes a 1.5k protection resistor in series with the FAULT pin that makes it is safe to connect this pin directly to a logic voltage supply, as might happen if you use this board in a system designed for the pin-compatible A4988 carrier. In such a system, the 10k resistor between SLEEP and FAULT would then act as a pull-up for SLEEP, making the DRV8825 carrier more of a direct replacement for the A4988 in such systems (the A4988 has an internal pull-up on its SLEEP pin). To keep faults from pulling down the SLEEP pin, any external pull-up resistor you add to the SLEEP pin input should not exceed 4.7k.

    Current limiting

    To achieve high step rates, the motor supply is typically much higher than would be permissible without active current limiting. For instance, a typical stepper motor might have a maximum current rating of 1 A with a 5Ω coil resistance, which would indicate a maximum motor supply of 5 V. Using such a motor with 12 V would allow higher step rates, but the current must actively be limited to under 1 A to prevent damage to the motor.

    The DRV8825 supports such active current limiting, and the trimmer potentiometer on the board can be used to set the current limit. You will typically want to set the driver’s current limit to be at or below the current rating of your stepper motor. One way to set the current limit is to put the driver into full-step mode and to measure the current running through a single motor coil without clocking the STEP input. The measured current will be 0.7 times the current limit (since both coils are always on and limited to approximately 70% of the current limit setting in full-step mode).

    Another way to set the current limit is to measure the voltage on the “ref” pin and to calculate the resulting current limit (the current sense resistors are 0.100Ω). The ref pin voltage is accessible on a via that is circled on the bottom silkscreen of the circuit board. The current limit relates to the reference voltage as follows:

    Current Limit = VREF × 2

    So, for example, if you have a stepper motor rated for 1 A, you can set the current limit to 1 A by setting the reference voltage to 0.5 V.

    Note: The coil current can be very different from the power supply current, so you should not use the current measured at the power supply to set the current limit. The appropriate place to put your current meter is in series with one of your stepper motor coils.

    Power dissipation considerations

    The DRV8825 driver IC has a maximum current rating of 2.5 A per coil, but the current sense resistors further limit the maximum current to 2.2 A, and the actual current you can deliver depends on how well you can keep the IC cool. The carrier’s printed circuit board is designed to draw heat out of the IC, but to supply more than approximately 1.5 A per coil, a heat sink or other cooling method is required.

    This product can get hot enough to burn you long before the chip overheats. Take care when handling this product and other components connected to it.

    Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current. Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a switching step-down power supply). Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. Additionally, please note that the coil current is a function of the set current limit, but it does not necessarily equal the current limit setting. The actual current through each coil changes with each microstep. See the DRV8825 datasheet for more information.

    Schematic diagram

    Schematic diagram for the DRV8824/DRV8825 stepper motor driver carrier.

    The current sense resistors (R2 and R3) on the DRV8825 carrier are 0.100 Ω. This schematic is also available as a downloadable pdf (196k pdf).

    Key differences between the DRV8825 and A4988

    The DRV8825 carrier was designed to be as similar to our A4988 stepper motor driver carriers as possible, and it can be used as a drop in replacement for the A4988 carrier in many applications because it shares the same size, pinout, and general control interface. There are a few differences between the two modules that should be noted, however:

    DRV8825 stepper motor driver carrier.
    A4988 stepper motor driver carrier, Black Edition
    • The pin used to supply logic voltage to the A4988 is used as the DRV8825’s FAULT output, since the DRV8825 does not require a logic supply (and the A4988 does not have a fault output). Note that it is safe to connect the FAULT pin directly to a logic supply (there is a 1.5k resistor between the IC output and the pin to protect it), so the DRV8825 module can be used in systems designed for the A4988 that route logic power to this pin.
    • The SLEEP pin on the DRV8825 is not pulled up by default like it is on the A4988, but the carrier board does connect it to the FAULT pin through a 10k resistor. Therefore, systems intended for the A4988 that route logic power to the FAULT pin will effectively have a 10k pull-up on the SLEEP pin. (This 10k resistor is not present on the initial (md20a) version of the DRV8825 carrier.)
    • The current limit potentiometer is in a different location.
    • The relationship between the current limit setting and the reference pin voltage is different.
    • The DRV8825 offers 1/32-step microstepping; the A4988 only goes down to 1/16-step.
    • The mode selection pin inputs corresponding to 1/16-step on the A4988 result in 1/32-step microstepping on the DRV8825. For all other microstepping resolutions, the step selection table is the same for both the DRV8825 and the A4988.
    • The timing requirements for minimum pulse durations on the STEP pin are different for the two drivers. With the DRV8825, the high and low STEP pulses must each be at least 1.9 us; they can be as short as 1 us when using the A4988.
    • The DRV8825 has a higher maximum supply voltage than the A4988 (45 V vs 35 V), which means the DRV8825 can be used more safely at higher voltages and is less susceptible to damage from LC voltage spikes.
    • The DRV8825 can deliver more current than the A4988 without any additional cooling (based on our full-step tests: 1.5 A per coil for the DRV8825 vs 1.2 A per coil for the A4988 Black Edition and 1 A per coil for the original A4988 carrier).
    • The DRV8825 uses a different naming convention for the stepper motor outputs, but they are functionally the same as the corresponding pins on the A4988 carrier, so the same connections to both drivers result in the same stepper motor behavior. On both boards, the first part of the label identifies the coil (so you have coils “A” and “B” on the DRV8825 and coils “1” and “2” on the A4988).
    • For those with color-sensitive applications, note that the DRV8825 carrier is purple.

    In summary, the DRV8825 carrier is similar enough to our A4988 carriers that the minimum connection diagram for the A4988 is a valid alternate way to connect the DRV8825 to a microcontroller as well:

    Alternative minimal wiring diagram for connecting a microcontroller to a DRV8824/DRV8825 stepper motor driver carrier (full-step mode).
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    RM48.00
    RM70.00
  • LM2596S-ADJ DC-DC adjustable step-down module IN3-40V OUT1.5-35V (LM2596S)



    LM2596S-ADJ DC-DC adjustable step-down module In3-40Vdc Out1.5-35Vdc

     

    Note that the input and output can not be reversed . Reverse may cost damage to circuit !



    Input : DC 3V to 40V

    Output : DC 1.5V to 35V voltage is continuously adjustable , high efficiency maximum output current of 3A.

    Features : All solid capacitors using SANYO , 36u thick circuit boards, high-Quality inductors with high- output LED indicators

    DC-DC 45 ( L) * 20 ( W ) * 14 ( H) mm 

    Note: long working hours is recommended for use in less than 2.5A current , while adding a heat sink (10W output above ) ;
    As the buck module , in order to ensure stable output , keep a minimum 1.5V differential .

    The voltage regulator
    Access to power (3-40V), adjust the blue potentiometer knob ( clockwise general boost, buck counter-clockwise ) and use a multimeter to monitor the output voltage reaches the needed voltage.

    Wiring
    1 welding, soldering directly to the power line at the input ( output ) port ;
    2 solder pins, the pins can be inserted through a lead or plug in the hole using the board ; soldered directly to the PCB or add pin after another .

    Application examples
    1 vehicle power supply , simply enter the module powered cigarette holder termination point on the car , you can adjust the potentiometer , the output voltage can be adjusted in 1.25-30V , for your phone , MP3, MP4, PSP and other charge many devices powered, very simple and convenient .

    2 to the power electronic device , when the device requires 3-35V supply voltage of the power supply while the corresponding hands , you can easily use this module to the required voltage of the voltage and solve problems.

    3 Operating voltage test system , you can use this module to do the project when debugging a variety of voltage test system operating voltage range , very easy and convenient

    Add to Cart
    RM12.50
    RM15.00
  • A4988 Stepper Motor Driver Module for RepRap 3D Printer (A4988)
    3D Printer StepStick A4988 Stepper Drive Pololu Reprap
    Brief introduction


        A4988 is a complete microstepping motor driver with built-in translator for easy operation. This product is available in full, half, 1/4, 1/8 and 1/16 step modes operate bipolar stepper motors, output drive capacity of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator, the regulator in slow or mixed decay modes. A4988 converter is the key to the easy implementation. As long as the "step" input inputting one pulse drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. A4988 interface is very suitable for complex microprocessor is unavailable or is overburdened.
        In the micro-step operation, A4988 chopping control inside automatically selects the current decay mode (Slow or Mixed). In mixed decay mode, the device is initially set to a fixed downtime in some fast decay, then the rest of the slow decay downtime. Mixed decay current control scheme results in reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry is provided to improve the pulse-width modulation (PWM) operation power consumption. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power sequencing.

        A4988 surface mount QFN package (ES), a size of 5 mm × 5 mm, nominal overall package height of 0.90 mm, with an exposed pad for enhanced thermal dissipation. This package is Pb (suffix-T), with 100% matte tin leadframe plating.

    ----------------------------------------------

    Features and Benefits

    · Low RDS (On) Output
    · Automatic current decay mode detection / selection
    · Mix with slow current decay modes
    · For low power dissipation synchronous rectifier
    · Internal UVLO
    · Cross-current protection
    · 3.3 and 5 V compatible logic supply
    · Thermal shutdown circuitry
    · Ground fault protection
    · Load short-circuit protection
    · Optional step five modes: full, 1/2, 1/4, 1/8 and 1/16

    Click here for more information.


    Reprap Pololu stepper driver board


    Add to Cart
    RM28.50
    RM33.25
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