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Update Stepper_ULN2003A.md

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# Stepper_ULN2003A # Stepper_ULN2003A
This is a derived class of **StepperControl** designed to operate stepper motors driven by a [Toshiba TB6612](https://cdn-shop.adafruit.com/datasheets/TB6612FNG_datasheet_en_20121101.pdf) chip, either with or without the use of ESP32 PWM pins. This is a derived class of **StepperControl** designed to operate stepper motors driven by a [Texas Instruments ULN2003A](https://www.ti.com/lit/ds/symlink/uln2003a.pdf) (or equivalent) chip.
The Toshiba TB6612 is a generic motor driver providing direct control of two full H-bridges. Wiring for the [Adafruit TB6612 1.2A DC/Stepper Motor Driver Breakout Board](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout) that uses this chip is as follows: The Texas Instruments ULN2003A chip containins an array of seven Darlington transistor pairs each capable of converting low-voltage/low-current digital signals into higher-voltage/higher-current outputs suitable for driving a stepper motor.[^1]
[^1]: Only four of the seven Darlington transistor pairs in the ULN2003A are needed to drive a typical unipolar stepper motor.
Various manufacturers have incorporated this chip into a dedicated stepper motor board designed to drive unipolar motors such as these [28BYJ-48 5-Volt](https://opencircuit.shop/product/28byj-48-5v-stepper-motor-4-phase-5-wire) and [28BYJ-48 12-Volt](https://opencircuit.shop/product/28byj-48-12v-stepper-motor-4-phase-5-wire) Stepper Motors. Wiring for the [Opencircuit ULN2003 Stepper Motor Driver Board](https://opencircuit.shop/product/uln2003-stepper-motor-driver-module) that uses this chip is as follows:
#### **Power Connections** #### **Power Connections**
* *VCC* - connect to +3.3V on ESP32 * *VCC* - connect to +3.3V on ESP32