Specification of ULN2803 Stepper Motor Driver Board: 500mA drain per channel.

Applications of ULN2803 Stepper Motor Driver Board: It is used in stepper Motor Driving Circuit.

Note: Please do not use powerful AAA battery for transmitter,normal battery will be fine,otherwise may cause transmitters getting hot and burned.

Also Searched as: ULN2803A motor driver, Stepper motor Driver.

A Stepper Motor is a type of DC Motor that rotates in steps.

A Stepper Motor Driver is a circuit that takes the pulse signals from a controller and converts them in to Stepper Motor Motion.

In this project, we have used this 555 IC for generating a pulse i.e.

Astable Mode of operation.

These counters are often used in displays, frequency division operations, binary counters, etc.

And hence, this Stepper Motor Driver Circuit is essentially a Binary Counter Circuit.

It is a Unipolar type Stepper Motor with 5 wire configuration.

Basically, Stepper Motors are classified in to Unipolar Stepper Motors and Bipolar Stepper Motors, based on the windings of the stator.

The following image shows a Bipolar Stepper Motor with its winding.

Hence, we use H bridge ICs like L293D to drive Bipolar Stepper Motors.

A Bypass Capacitor of 100 pF is connected at the Control Voltage Pin (Pin 5).

The other pins i.e.

VCC (Pin 8) is connected to 12V supply, Reset Pin (Pin 4) to 12V supply and Ground Pin (Pin 1) to GND.

These outputs are Q0 to Q3 i.e.

Pins 3, 2, 4 and 7 respectively.

The outputs of the Counter are connected to base terminals of 4 transistors through separate 1 K Resistors.

The center pin is shorted internally and is connected to the supply (12V here).

They must be connected to the collector terminals of the four transistors.

Finally, four diodes are connected between the collector terminals and supply.

Diodes are very important as they will protect the transistors from inductive spiking.

First, the 555 Timer IC is configured as an Astable Multivibrator i.e.

For every positive transition of the clock signal i.e.

The common wire in the stepper motor is given to 12V supply.

Now, the current flows from common wire to GND through point B.

This process continues and depending on the frequency of the clock signal, the speed of rotation of the stepper motor varies.

Uln2803 Stepper Motor Driver Circuit