Designer-Systems-4-Channel-Stepper-Motor-Driver-Shield-I2C-Designer-Systems-DS-STX4-S-A-4-channel-unipolar-stepper-motor-driver-with-advanced-control-features-that-is-ideal-for-use-with-the-b-Raspberry-Pi-b-&-b-Arduino-UNO-b-systems-The-shield-features-high-speed-I-sup 2-C-communication-for-easy-project-integration-&-smooth-speed-control-br-br-Each-connected-stepper-motor-can-be-stepped-in-either-direction-a-specific-number-of-steps-continually-stepped-stopped-with-a-hol