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Update Stepper_A3967.md

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docs/StepperDrivers/Stepper_A3967.md
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This is a derived class of **StepperControl** designed to operate stepper motors driven by an [Allegro A3967](https://www.sparkfun.com/products/12779) chip. To use, add `#include "extras/Stepper_A3967.h"` to the top of your sketch. This is a derived class of **StepperControl** designed to operate stepper motors driven by an [Allegro A3967](https://www.sparkfun.com/products/12779) chip. To use, add `#include "extras/Stepper_A3967.h"` to the top of your sketch.
The Allegro A3967 is a specialized driver designed for stepper motors. It contains a built-in PWM generator and pre-programmed stepping modes. Wiring for the [EasyDriver Sparkfun](https://learn.sparkfun.com/tutorials/easy-driver-hook-up-guide?_ga=2.152816825.1841726212.1688220137-156607829.1686369274) board that uses this chip is as follows: The Allegro A3967 is a specialized driver designed for stepper motors. It contains a built-in PWM generator and pre-programmed stepping modes. Wiring for the [Sparkfun EasyDriver Stepper Motor Board](https://learn.sparkfun.com/tutorials/easy-driver-hook-up-guide?_ga=2.152816825.1841726212.1688220137-156607829.1686369274) that uses this chip is as follows:
#### **Power Connections** #### **Power Connections**
* *GND* - connect to GND on the ESP32, and to ground of external DC power supply * *GND* - connect to GND on the ESP32, and to ground of external DC power supply