k158.pdf

K158. BI-POLAR STEPPER MOTOR DRIVER

This kit will drive a bi-polar stepper motor driver using

externally supplied 5V levels for steping and direction.

These usually come from software running in a computer.

9V was used. The STEP and DIRection negative input

pins were tied together and connected to system ground.

COMPONENTS

Resistors 5%, 1/4W, carbon

150R brown green brown

Google ‘Stepper Motor Software’ and will see a range of

controller freeware available. Also go to

R9 R10 R15 R16

1K brown black red

R1 R2

http://www.metalworking.com/

http://www.kellyware.com/

http://www.thegallows.com/stepster.htm

http://www.stepperworld.com/

http://www.ams2000.com/

2K2 red red red

R7 R8 R13 R14

10K brown black orange

R3 R4

12K brown red orange

R5 R6 R11 R12

100uF/35V ecap

10uF mini ecap

100uF/63V ecap

Construction. Follow the overlay on the PCB. Add the

lowest height components first – the resistors and diodes.

Note there are seven links to add to the board. For the six

short links use offcuts from the resistor legs. For the

longer link we have provided a 1 ½” of tinned copper

wire. There are 4 pins you can place in the DIR and STEP

positions if you wish to use the pins.

1N4148 diode

D1 – D8

104 mono

Pins

4013 IC

IC1

4030 IC

IC2

4N25 IC

IC3 IC4

7805 IC

IC5

BC547B transistors

We have assumed that the operation of stepper motors is

known to you. If not google the topic and also see our

Kits 109, 113 and 179.

Q1 Q2 Q3 Q4

IRFZ44

Q1B Q2B Q3B Q4B

MTP2955

Q1A Q2A Q3A Q4A

6 pin IC socket

Operation. Attach a bi-polar stepper motor to the TO

MOTOR terminals. Power to the Kit can be the same or

different depending on the stepper motor being driven.

14 pin IC socket

2 pole terminal block

tinned copper wire

1 1/2"

K158 PCB

The DIR ection and STEP inputs are opto-isolated by the

4N25 IC’s.

All the power inputs were connected together. The

CLOCK was connected to STEP, and the RESET was

connected to DIRection. Pushing the CLOCK button then

advanced the motor one notch. Pressing CLOCK with the

RESET button also depressed and pressed down advanced

the motor one notch the other way.

DIR ection. This is controlled by a 0V or 5V applied

between the pins.

STEP. A 5V to 0V transistion between the pins will step

the motor one position. The step direction will be

according to the voltage applied to the DIRection pins.

Software does the same thing but using a PC.

The full color photo can be downloaded from

http://www.kitsrus.com/jpg/k158_1.jpg

This kit is based on a kit from Oatley Electronics,

Australia. It is adapted here with permission.

You can read about about other stepper motor kits:

http://www.kitsrus.com/pdf/k109.pdf

http://www.kitsrus.com/pdf/k113.pdf

http://www.kitsrus.com/pdf/k179.pdf

(Documentation march 30, 2003.)

- - - - - - - - - - - - - - - - - -

We used the debounced Counter Module of our Kit 1 to

test Kit 158. You can get the schematic for it here

http://www.kitsrus.com/pdf/k1.pdf

The unipolar stepper motor is connected as a bipolar

motor (the 2 center wires of the 6 wire motor are unused.)

K158. BI-POLAR STEPPER MOTOR DRIVER

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