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Arduino Stepper Control Board - Any Driver

The tiny stepper controller is a controller board for stepper motor. It can be controlled manually (potentiometer and switches) and programmed with Arduiono IDE.


Technical Specifications

Stepper Motor driver board: A4988 Microcontroller: Attiny84. Input Power: 12Volts. (30V max) Power Socket: 2.1mm Jack. Center positive. Motor connector: 4 way molex.

Manual Control ready with:

  • Potentiometer for speed.
  • Push button for single step increment.
  • Slider switch for direction selection.
  • i2c port
  • Serial port in FTDI configuration

<File:20150418_154242_small.jpg> <File:IMG_0528_small.jpg>

Hardware Controls

Slide Switch

The slide switch can be used as control - generally used for direction control. It is connected to digital input 3 on the arduino chip. Direction pin to the driver is connected to digital output 1.

#define Switch 3 #define Direction 1

Push Buttons

Two push buttons are available. These can be used for any desired manual function such as speed up, move left, start, stop etc...

They are configured with digital input 0 and 2.

#define Button1 2 #define Button2 0


The board host a potentiometer for variable control such as speed. It is connected to analogue input 3.

#define Pot 3

i2c port

The board has provision for an i2c port. This can be used to connect to some external device (lcd screen, slave device). Or it can be connected to another arduino board to serve as slave device. The recommended library for use of the i2c is TinyWireM from this link here modified for the attiny84 chips.

Use a LCD i2c with attiny84

Stepper Control Board with LCD

Serial Port

The serial connector as a FTDI layout to allow connecting directly a FTDI adaptor. This allows communications from the board to a computer. e.g. sending commands to the board or displaying debug information.

Sketch Examples

Default Sketch

The default sketch loaded in the Attiny84 is a basic sketch to control the motor manually. The potentiometer will be use as speed control. Download Sketch Version 1.1.

A demonstration can be seen on this video

i2c Control

The two i2c pins of the Attiny84 are available on the board to be controlled from an i2c master.

This is a sketch for the Attiny85 for speed and direction control. Commands are as follow "a" for direction 1 - e.g. Master will issue Wire.write("a") "b" for direction 2 - e.g. Master will issue Wire.write("b") "delay:" for speed control - e.g. Master will issue Wire.write("1500:") ":" for stopping the motor - e.g. Master will issue Wire.write(":") Delay must be a number followed by a ":" which is the stop character. This number is the delay in microseconds between each steps.

Download Slave i2c Sketch. Download Master i2c Sketch.

Serial Sketch

This sketch allows controlling the stepper from serial communication.

Serial sketch v1.0

Control a Stepper Motor with Serial over USB

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