Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier with coin
Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier in bagPololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier frontbackPololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier backside in handPololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier front in hand front

Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier

$19.95

Though regular motor drivers can generally be used for full and half step applications true micro-stepping motor drivers like this one provide the highest level of precision and control for applications that demand it. These motor controllers are particularly well adapted for precision control and machining applications.

This driver is perfect for mid to low current CNC control applications like CNC mills, CNC laser cutters, and 3D printing, and can be easily driven by most micro-controllers like the Arduino Uno, Versalino Uno, and PIC platforms.

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Product Description

Package Contents:

Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier

Features/Specifications:

Minimum operating voltage: 8 V
Maximum operating voltage: 35 V
Continuous current per phase: 1 A
Maximum current per phase: 2 A
Minimum logic voltage: 3 V
Maximum logic voltage: 5.5 V
Microstep resolutions: full, 1/2, 1/4, 1/8, and 1/16
Reverse voltage protection?: Yes

Usage diagram:

Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier usage diagram

Pinout and Microstep details:

Pololu A4988 Stepper Motor 1/16-step plus 1A Uncooled (2 A max cooled) 8-35V Driver Carrier pinout details

 

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 A4988 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 (MS1, MS2, and MS3) enable selection from the five step resolutions according to the table below. MS1 and MS3 have internal 100kΩ pull-down resistors and MS2 has an internal 50kΩ pull-down resistor, 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.

MS1MS2MS3Microstep Resolution
LowLowLowFull step
HighLowLowHalf step
LowHighLowQuarter step
HighHighLowEighth step
HighHighHighSixteenth 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. Not

Power dissipation considerations

The A4988 driver IC has a maximum current rating of 2 A per coil, but 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 A per coil, a heat sink or other cooling method is required.

WARNING: 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.

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