The CNC Shield V3.0 allows to build a engraving machine, 3D printer, mini CNC and other similar devices using your Arduino.
It is designed as a shield and can plug on top of an Arduino requiring no external connections and wiring. There are 4 slots on the board for plugging in stepper motor drive module which can drive 1 stepper motor each. Controlling each step stepper motor requires only two IO pins on the Arduino. Just insert this Arduino CNC Shield V3.0 onto an Arduino UNO, and install the GRBL firmware, so it can quickly build a DIY CNC engraving machine.
A4988 may be a complete microstepping motor driver with built-in translator for straightforward operation. This product is out there fully , half, 1/4, 1/8 and 1/16 step modes operate bipolar stepper motors, output drive capacity of up to 35 V and a couple of A. A4988 includes a hard and fast off-time current regulator, the regulator in slow or mixed decay modes. A4988 converter is that the key to the straightforward implementation. As long because the "step" input inputting one pulse drives the motor one microstep. There are not any phase sequence tables, high frequency control lines, or complex interfaces to program. A4988 interface is extremely suitable for complex microprocessor is unavailable or is overburdened. In the micro-step operation,
A4988 CNC Shield V3.0 can be used as drive expansion board for engraving machine, 3D printer and other devices. There’re 4 slots within the board for stepper motor drive modules, can drive 4 stepper motors, and every step stepper motor only need two IO port, that's to say, 6 IO ports can quite well to manage three stepper motor, it’s very convenient to use. After insert Arduino CNC Shield V3.0 into Arduino UNO, and installed GRBL firmware then you'll quickly DIY a CNC engraving machine.
A4988 chopping control inside automatically selects the present decay mode (Slow or Mixed). In mixed decay mode, the device is initially set to a hard and fast downtime in some fast decay, then the remainder of the slow decay downtime. Mixed decay current control scheme leads to reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry is provided to enhance 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.