3-Axis Stepper Controller
This controller is designed to control (3) three unipolar
stepper motors at up to 35V@1.25A
The controller is optimized for use with shareware CAD/CAM software (i.e.
DANCAD3D). Connections are provided for limit and home switches. Motor, switch,
and power connections are via terminal blocks. Control inputs from the PC
parallel port are via pads on the PCB. Logic power for the stepper control ICs
and control input pull-ups is provided from the motor supply
via a 7805 regulator. This should be safely usable at motor voltages up to 25V.
The PCB measure 3"x4" and has (4) four mounting pads. Postscript(tm) files are
provided for the schematic, PCB layout, and PCB parts placement diagram.
These files are named schmatic.ps,
pcb.ps, and overlay.ps, respectively.
For more info on homemade CNC equipment, see the series of articles by Dan Mauch
starting in the October, 1994 issue of "Nuts & Volts".
Download schematic in ps
Refer to the schematic and parts placement for connections to
the PC parallel port. While designed to be controlled from a PC, the controller
can easily be controlled from a microcontroller or even logic circuitry. All
control inputs are TTL compatible. Refer to placement diagram for power
When looking at the numbers on the parts overlay, the control connections are
10 - limit and pause switch: this connection, specifically for PC connections,
is used to monitor normally closed (N.C.) limit switches. When one of these
switches, connected in series, opens, it generates an interrupt in the PC that
can be used to stop the motors. IF YOU CHOOSE NOT TO USE LIMIT SWITCHES THIS
INPUT MAY HAVE TO BE SHORTED SO IT DOESN'T SEE AN "OPEN SWITCH".
2, 3, 4 - x-, y-, and z-axis step inputs, respectively.
6, 7, 8 - x-, y-, and z-axis direction inputs, respectively. Direction polarity
depends on the motor connections. (to switch direction polarity, simply reverse
the motor connections
13, 12, 11 - these PC connections are used to bring the controlled machinery
(i.e. X-Y table) to a "home" position. Normally open (N.O.) switches are used
Parts List for 3-Axis Stepper Controller
(1) PC Board: CW Technology AX3UP-PCB ($18) or make.
(3) U1-3 UCN5804B Stepper Controller IC: CW Technology ($7) or Pure Unobtanium
(12) D1-12 200V/1A Fast Recovery Rectifiers: Digi-Key 1N4935CT-ND
(1) VR1 7805 5V Regulator: various
(4) R1-4 4.7K ohm, 1/4W resistors: various
(2) C2,3 0.01 uF, 63V Monolithic capacitor: Digi-Key P4914-ND
(1) C1 10uF, 25V Miniature Electrolytic: Digi-Key P813
(3) Slide-on sink for U2: Digi-Key HS125-ND
(3) RP1-3 Resistor Network: Digi-Key 770-81-R-4.7K
(14) 2-pos. Terminal blocks (optional): Digi-Key ED-1601-ND
(1) Parallel port cable: various
CW Technology (me) ALL ABOVE PRICES INCLUDE SHIPPING
7328 Timbercreek Ct
Reynoldsburg, OH 43068-1181
800-547-7479 - COD Orders Only 24 hrs. ($5 COD Charge applies)
Sorry, no MC/Visa at this time.
701 Brooks Ave
Thief River Falls, MN 56701
13109 Old Creedmoor Rd
Raleigh, NC 27613
Also check the conversation about this project at the community. Post you
Questions and comments can be sent to firstname.lastname@example.org.