Full Function Robot Expansion Board Support Stepper Motor Servo For Raspberry Pi 3B \/2B \/ B+    Description:    Stepper motors are great for (semi-)precise control、 perfect for many robot and CNC projects.  This HAT supports up to 2 stepper motors. The python library works identically for bi-polar and uni-polar motors.  Download link: http:\/\/pan.baidu.com\/s\/1c0dUDFy  Function:   1. 4 H-Bridges: Provides 1.2A per bridge (3A peak) with thermal shutdown protection、 internal kickback protection diodes.                             Can run motors on DC5V to DC12V. 2. Up to 4 bi-directional DC motors with individual 8-bit speed selection (so、 about 0.5% resolution) 3. Up to 2 stepper motors (unipolar or bipolar) with single coil、 double coil、 interleaved or micro-stepping. 4. Up to 4 Channel 12-bit PWM\/Servo(5V) 5. One Infrared Receiver(GPIO26) 6. Big terminal block connectors to easily hook up wires (18-26AWG) and power 7. Polarity protected 2-pin terminal block and jumper to connect external 5-12VDC power 8. Works best with Raspberry Pi model A+、 B+、 or Pi 2  Package included:  1 x Full Function Robot Expansion Board Support Stepper Motor Servo For Raspberry Pi 3B \/2B \/ B+