The fan is very quiet during operation.Easy to assemble.The look is cool.Good heat dissipation and safe and reliable use.easy to configure, smaller and more portable, no soldering needed 100% new quality.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/1c0dUDFyFunction: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 power7. Polarity protected 2-pin terminal block and jumper to connect external 5-12VDC power8. Works with Raspberry Pi model A+, B+, or Pi 2Package included:1 x Full Function Robot Expansion Board Support Stepper Motor Servo For Raspberry Pi 3B /2B / B+
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