A4988 Stepper Driver Module
by Allegro / clone
SKU: PSA-CMP-A4988
No reviews yetTypical India street price
₹80–₹180
Current-chopping driver for NEMA-17 — 3D printers and CNC.
Interface: STEP/DIR + microstep pins
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Concept
You pulse STEP; the chip sequences the coil currents with a set current limit.
A little theory
Vref ≈ 8 × Imax × Rs (Rs often 0.1 Ω). Heat sink required. Microstep 1–1/16. In the classroom, treat A4988 Stepper Driver Module as a intermediate part using STEP/DIR + microstep pins. Typical India street price is about ₹80–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Set Vref with a DMM, connect STEP/DIR, enable LOW.
Classroom & project use
- NEMA 17 plotter
- Camera slider
- Mini CNC
Buying in India
Precautions
- Disconnect motor while powered = killed driver
- Heat sink
Specifications
| Current | Up to ~2A (cooled) |
| Interface | STEP/DIR |
| Category | Drivers & Relays |
| Difficulty | Intermediate |
| Voltage | 3.3–5V logic; motor 8–35 V |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
