A4988 stepper motor controller - stepstick - Reprap CNC 3D printers

A system commonly used in CNC machines and 3D printers (RepRap).

• A4988 Stepstick stepper motor driver module with heatsink included
• Perfect driver for 3D printers (RepRap)
• Example use in CNC Shield for 3D printers
• Stepper motor driver based on the A4988 system.
• Wide supply voltage range 8 - 35 V
• High operating current up to 2 A per coil.
• Maximum resolution: 1/16 step.
• Attention! Connecting and disconnecting the engine while the controller is turned on may damage the system.

• The module is equipped with the A4988 chip
• Motor supply voltage: 8-35V
• Max current: 2A with heatsink
• Working in 5 different modes: full step, 1/2, 1/4, 1/8 and 1/16 step
• Possibility to adjust the current consumed by the motor using a potentiometer - ceramic screwdriver available here.
• Protection against system overheating

• Module with A4988 stepper motor driver
• Radiator

• Wiki for A4988
• Reprap - driver description

1. Control

• The module is characterized by very simple operation.
• To rotate the motor by a step, a high state (logical one) must be given to the STEP pin, the next sequence of zeros and ones will move the motor by another step, etc.
• The direction is selected by providing the appropriate state to the DIR output (e.g. low state - clockwise rotation, low state - counterclockwise).
• The controller also has the ability to select the engine operation resolution.

• To power the logical part of the module, a voltage in the range of 3V to 5.5V is required, which should be connected to the VDD pin.
• The motor supply voltage in the range from 8V to 35V is fed to the VMOT pin. The system can be controlled by motors with a nominal voltage lower than the required 8V. To do this, limit the maximum current consumption using a potentiometer so as not to exceed the permissible motor current. For example, for a motor with a resistance of 5Ω per coil and a current consumption of 1A, the nominal supply voltage is 5V. When powering with 12V, the current should be limited so that it does not exceed 1A.

• One pulse given to the STEP pin causes the motor to step one step in the selected direction by providing the appropriate logical state to the DIR pin.
• The STEP and DIR pins are not internally pulled up.
• If the motor is to rotate only in one direction, the DIR pin can be permanently connected to VCC or GND.
• The system has three more inputs to control power consumption: RESET SLP and EN, their description can be found in the documentation.
• Note that the RESET pin is not pulled up to anything. If it is not used, it can be connected to the adjacent SLEEP pin.

• The A4988 module allows active current limitation using a potentiometer.
• One way to introduce a limitation is to set the controller to full step mode and measure the current flowing through one coil without sending a signal to the STEP input.
• The measured current is 70% of the set limit (both coils are always on and limited to 70% in full step mode).
• Another way is to measure the voltage on the REF pin (marked with a circle on the printed circuit board) and calculate the current limit (measuring resistors have a value of 0.05Ω).
• More details in the documentation for the A4988 chip.

• The board is designed to be able to dissipate heat with a current consumption of approximately 1A per coil.
• If the current is much higher, an external heat sink should be used, for which you can use thermally conductive glue - the heat sink is in our offer

Claim orders from Stores

You can claim your purchased items within 1 - 4 work days after making an order (if product is in local warehouse).

Please wait for an email notification regarding Your order status update.

Vilnius Store address: Vytenio g. 20, LT-03229 Vilnius, Lietuva

Kaunas Store address: Pramonės pr. 4D, LT-51329, Kaunas, Lietuva

Local delivery in Lithuania

Purchased items are delivered locally through Venipak service. Depending on availability of items, orders are processed within 1-3 work days. Orders made until 1AM are shipped the same day.

Local delivery  (1-4 w.d.) price for items of any size is through through courier service is 4.90€ (incl. VAT), if the amount of the shopping cart exceeds 150€ - delivery is free.

Local delivery price to Venipak parcel terminals (1-3w.d.) is 2.90€ incl. VAT, if the amount of the shopping cart exceeds 50€ - delivery is free.

Local delivery price to Omniva parcel terminals (1-3w.d.) is 3.90€ incl. VAT,if the amount of the shopping cart exceeds 70€ - delivery is free.

Payment on delivery (COD) +2.00€ (incl. VAT).

You can pay for the goods at the time of delivery to the courier in cash or by credit card. Payment to Omniva parcel terminals is only possible by bank card.

A separate delivery fee applies to oversized items, regardless of the amounts and conditions stated above.

International delivery pricing through courier service

International shipping prices depend on geographic location:

Latvia - 5.50€ (incl. VAT)

Estonia - 6.50€ (incl. VAT)

Paid orders of more than 150€ are shipped for free to Latvia and Estonia.

other countries - negiotiated individually.

International delivery pricing to Omniva/Venipak parcel terminals

Latvia - 6.00€ (incl. VAT)

Estonia - 8.50€ (incl. VAT)

Payments:

We accept payments via PayPal for orders over 20€.

Product availability status:

Vilnius Store In Stock - the product is at the store, Vytenio str. 20 in Vilnius and can be picked up / purchased at same day;

Kaunas Store In Stock - the product is at the store, Pramonės pr. 4D in Kaunas and can be picked up / purchased the same day;

Central Warehouse In Stock - In stock, product will be shipped in a short time 1-2 work days;

1-2 work days - product will be shipped in a short time - 1-2 business days;

2-3 work days – we don’t have selected product in local warehouse. Shipping time is only 2-3 work days;

3-5 work days – we don’t have selected product in local warehouse. Shipping time is between 3-5 work days;

3-7 work days – we don’t have selected product in local warehouse. Shipping time is between 3-7 work days;

Out of Stock – selected product is sold out at the moment, but you can apply for automatic alert by email when product will be in stock.