Features 1. Standard for Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano 2. Onboard dual HR8825 motor controller IC with built-in microstepping indexer, drives two stepper motors, easy to use 3. 6 available microstepping modes, configured with the DIP switches: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step 4. Adjustable motor drive current via potentiometer, maximum 2.5A current output<br><br>Overview Stepper Motor HAT (B), alternative solution of Stepper Motor HAT, drives two stepper motors, up to 1/32 Microstepping, for 3D printer, sculpturing machine, mechanical arm... Protection features: Overcurrent Protection (OCP), Thermal Shutdown (TSD), VM Undervoltage Lockout (UVLO) Integrates 5V regulator, allows providing power to Raspberry Pi Onboard multi connector options for stepper motors in different specifications Specifications Motor controller: HR8825 Motor drive voltage: 8.2V~28V Motor drive current: 2.5A Logic voltage: 3.3V Mounting hole size: 3.0mm Dimension: 65 x 56mm color: blue Material: PCB<br><br>Package Contents: 1 x Stepper Motor Expansion Board (B) 2 x RPi screws pack 1 x Aluminum heatsink<br><br>Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.