L293 micro motor drive chip working voltage: 4.5~36V maximum drive current 1A; Two DC servo-motor interface one four-phase stepping motor interface; Adopts opto-isolator for strong current and weak current furthest avoid MCU interference by electromagnetism; Two H bridge driver convenient to active PWM; Adopts locking binding post convenient to connect to continuous current motor and motor power; Motor drive and logical control is separated power supply can use 3.3V or 5V system control; There is no overcurrent protection in the chip please make sure the motor current is not too large