StepperCompare

COMPARISON OF THE 74194 - UNIPOLAR AND BIPOLAR STEP GENERATOR CONFIGURATIONS

©2003 ROB PAISLEY    http://home.COgeCO.Ca/~rpa i SI ey4/C i rcu i 11 ndex.html    Stepper 10 Pattern Comparison

03 December, 2003

5V

UNIPOLAR GENERATOR

Jo—

STEP

Jo-

STEP

74194

16	7
1	15
3	14
11	13
4	12
5	2
6	10
3	9

DIRECTION

-o D

-o

-o

-ir PIN 4 CONNECTED TO GROUND

5V

74194

16	7
1	15
3	14
4	13
11	12
5	2
6	10
3	9

DIRECTION

COIL DRIVER INPUT

-O X1

-O Y1

-O X2

-O Y2

-o

-o

PIN 4 CONNECTED TO +5 V0LTS

OUTPUT FROM THE 74194    ULN2303 MOTOR DR IVER

COIL DRIVER INPUT

-O A

-O B

-O c

OUT	1	STEP 2 3		4		IN	1	STEP 2 3		4	OUT
15	H	L	L	L —	-►	1,2	L	H	H	H	18,17
P 14	L	H	L	L —	-►	3,4	H	L	H	H	16,15
| N 13	L	L	H	L —	-►	5,6	H	H	L	H	14,13
12	L	L	L	H —	-►	7,8	H	H	H	L	12,1 1

BIPOLAR GENERATOR

OUTPUT FROM THE 74194

STEP

OUT	1	2	3	4
15	H	L	L	H
14	H	H	L	L
13	L	H	H	L
12	L	L	H	H

L293D MOTOR DRIVER

STEP

IN	1	2	3	4	OUT
--► 10	H	L	L	H	1 1
^15	L	H	H	L	14
—► 2	H	H	L	L	3
-► 7	L	L	H	H	6