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Update Stepper.md

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@ -16,7 +16,8 @@ The HomeSpan class that contains all the methods to control a stepper motor is c
* the addition of the PWM pins provides the ability to microstep the motor * the addition of the PWM pins provides the ability to microstep the motor
* **[Stepper_A3967](StepperDrivers/Stepper_A3967.md)** * **[Stepper_A3967](StepperDrivers/Stepper_A3967.md)**
* This class is used to operate stepper motors driven by an [Allegro A3967](https://www.sparkfun.com/products/12779) chip * This class is used to operate stepper motors driven by an [Allegro A3967](https://cdn.sparkfun.com/datasheets/Robotics/A3967-Datasheet.pdf) chip
* See, for example, the [Sparkfun EasyDriver Stepper Motor Board](https://www.sparkfun.com/products/12779)
* To use, add the following to the top of your sketch: `#include "extras/Stepper_A3967.h"` * To use, add the following to the top of your sketch: `#include "extras/Stepper_A3967.h"`
* Contructor: `Stepper_A3967(int M1, int M2, int STEP, int DIR, int ENABLE)` * Contructor: `Stepper_A3967(int M1, int M2, int STEP, int DIR, int ENABLE)`
* controls the driver board using 5 digital pins from the ESP32 * controls the driver board using 5 digital pins from the ESP32