NEMA Stepper Controller

Introduction

NEMA Stepper Controller (NSC) is an interface that permits to easily control a bipolar stepper motor by integrating the power driver and the controller on a single board, whose dimensions don't exceed the size of a NEMA17 motor, removing need of a power interface by integrating it closer to the motor.

Applications

NSC interface could be used for every application based on a the control of bipolar stepper motors. For example :

* astronomy : motorisation of a telescope mount, or focuser system
* photography/video : dollycam or panoramic automation
* mechanics : CNC, 3D printer...
* robotics

Presentation

NSC is an electronic card that can be fixed directly on a NEMA17 motor. 
Following view shows a simplified sketch of NSC on a motor :

NSC1 3D

Main characteristics

Electronic

* Drives a bipolar stepper motor up to 3A/phase
* Control of the motor up to 1/128th step
* Board supply voltage from 5V to 16V (motor voltage adjustable via potentiometer)
* USB direct communication or I²C bus (slave)
* Bluetooth version (optional)
* Over-temperature and over-current protection

Mechanical

* Dimensions : 42.0±0.1mm
* Thickness : TBD
* Fixed to the motor with 4 M3x40 screws (length can be different depending on the motor) and 4 M3x5 spacers
* Communication ports : vertical 
USB type B, I²C on a connector type JST-PH 3 points (2mm step)
* Power connector : 2 points 
screw terminal (18AWG to 26AWG wire)
* Motor connector : 4 points screw terminal (18AWG to 26AWG wire)

Software

* USB direct communication, several possibilities of configuration/automation with NSCcontrol software (compatible Windows and Linux)
* Bluetooth control (optional) via Android (>4.4) application
Documentation for USB and I²C protocols provided
* For astronomy : ASCOM compatible (wired communication only, control of both axes of a mount by using a central interface currently under development)

Princing and availability

* Availability : S2/2017
* Available in version "board only" or in version with motor (motor model : TBD), with or without Bluetooth option
* Prices : TBD
* Possibility to order customized I²C communication wires (prices: TBD)