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Update Stepper_TB6612.md

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docs/StepperDrivers/Stepper_TB6612.md
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This is a derived class of **StepperControl** designed to operate stepper motors driven by a [Toshiba TB6612](https://www.adafruit.com/product/2448) chip, either with or without the use of ESP32 PWM pins. To use, add `#include "extras/Stepper_TB6612.h"` to the top of your sketch.
The Toshiba TB6612 is a generic motor driver providing direct control of two full H-bridges. Wiring for the [Adafruit Motor Driver board](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout) that uses this chip is as follows:
The Toshiba TB6612 is a generic motor driver providing direct control of two full H-bridges. Wiring for the [Adafruit Motor Driver](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout) board that uses this chip is as follows:
#### **Power Connections**
* *VCC* - connect to +3.3V on ESP32
* *VM* - connect to external DC power supply that will drive stepper motor (5-13V)
* *GND* (and *PGND1/PGND2*) - connect to GND on the ESP32, and to ground of external DC power supply
* *VM+* - connect to external DC power supply that will drive stepper motor (5-13V)
* *GND* - connect to GND on the ESP32, and to ground of external DC power supply
#### **Motor Connections**
* *AO1, AO2* - connect to the "A" coil of the stepper motor
* *BO1, BO2* - connect to the "B" coil of the stepper motor
* *MOTORA* - connect to the "A" coil of the stepper motor
* *MOTORB* - connect to the "B" coil of the stepper motor
#### **Control Connections**
* *AIN1, AIN2* - connect to two digital pins on the ESP32 - used to control direction and state of coil *A*
* *BIN1, BIN2* - connect to two digital pins on the ESP32 - used to control direction and state of coil *B*