control of stepper motor - Page 2 - Electronic Circuits Projects Diagrams Free

Hero999 · 26th September 2006, 09:42 AM

Perhapps actually tryng to read and understand the above thread might give you a clue rather than spamming it.

aoamb83 · 4th December 2006, 09:21 AM

driving a stepper motor using microcontroller is very easy. most steppers have 5 wires as an input . from this wires u can drive the motor by applying a combination of 1s and 0s (+5v , 0v) but u must connect the last wire with vcc, what u have to do is to write a code on PIC or AVR or whatever to give you the sequence of 4 bit combination (0110 foe example) according to the sequences that sanjivee mentioned then take the o/p of the micro controller to a ULN2003A
this IC gives u the ground to deal with stepper internal coils
if the notch of the IC on left side so pin 1,2,3,4,5 acts as i/p pin 6 should connect to ground and ur output will be the pins upper side
for example if ur i/p was on the 1st pin in the IC so ur o/p is @ pin number 12
the pin infront of the input pin on the upper side

Meesam · 5th December 2006, 03:40 AM

I have a stepper motor with 4-wires. I have also bought an IC ULN2803. Now i want to control this motor via AT89C52 MCU. Anybody can please guide me through about the circuit and its some details. I'll program the whole thing myself but I want to know that initially how will i have to start and how the hardware components will be interfacing to eachother.
I'll warmly welcome anybody's response.

Sceadwian · 6th December 2006, 01:46 AM

The ULN2803 is a darlington array. Your motor only has 4 wires which means it's a bipolar stepper motor. You need h-bridge drivers on each line. Only unipolar steppers can be driven directly from a basic transistor driver.

theinfamousbob · 6th December 2006, 02:36 AM

Quote:

Originally Posted by Meesam

Anybody please tell me how to identify the cables of a stepper motor. I mean which will be connected to which pin of which port of MCU. Also please help me how to connect some toy tires to the motor. I am not looking for a rover like thing but want to actually test whether a motor can be really tested for speed and direction. I'll be thankful for that.

Use a multimeter to test...

A bipolar stepper will have two coils, four wires...check which pairs are connected by using the resistance feature

0---&&&&&&&&---0 Coil 1

0---&&&&&&&&---0 Coil 2

A unipolar motor will have five, or six wires (maybe more). To drive it, you drive each wire in series...

0

|

0---&&&&&&&&---0 Coil 1

0---&&&&&&&&---0 Coil 2

|

0

(Note: in five wire motors the center taps are connected)

Hope this helps.

House0Fwax · 6th December 2006, 04:15 PM

Try this site, it has all about stepper motors, bipolar ones included.
I built the H bridge for a bipolar motor and it works fine.
http://www.eio.com/jasstep.htm#intro

jhouse · 19th February 2007, 05:42 PM

Anybody help...
We have this school project, we are making a electric fan controlled by PIC16F84A then goes through a stepper motor ..
Anybody can give me a program that can be controlled by switches for the rotation of the stepper motor. For example (Sw - Switch) Sw1 is 45 degrees , Sw2 90 degrees, Sw3 180 degrees, and Sw4 360 degrees..
Can anybody lend some circuit diag. or configurations on how to construct this. My stepper motor has 5 pins.

Thnx

Email add.
gangsta_lox@hotmail.com

kerelektronik · 5th October 2007, 10:57 PM

ucn5804B is a good alternative and completely logic based chip for controlling unipolar stepper motors, it s easier and more expensive way than ULNs..

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26th September 2006, 09:42 AM
Hero999 Experienced Member	Perhapps actually tryng to read and understand the above thread might give you a clue rather than spamming it. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

4th December 2006, 09:21 AM
aoamb83 New Member	driving a stepper motor using microcontroller is very easy. most steppers have 5 wires as an input . from this wires u can drive the motor by applying a combination of 1s and 0s (+5v , 0v) but u must connect the last wire with vcc, what u have to do is to write a code on PIC or AVR or whatever to give you the sequence of 4 bit combination (0110 foe example) according to the sequences that sanjivee mentioned then take the o/p of the micro controller to a ULN2003A this IC gives u the ground to deal with stepper internal coils if the notch of the IC on left side so pin 1,2,3,4,5 acts as i/p pin 6 should connect to ground and ur output will be the pins upper side for example if ur i/p was on the 1st pin in the IC so ur o/p is @ pin number 12 the pin infront of the input pin on the upper side __________________ Armando Alfredo

5th December 2006, 03:40 AM
Meesam New Member	I have a stepper motor with 4-wires. I have also bought an IC ULN2803. Now i want to control this motor via AT89C52 MCU. Anybody can please guide me through about the circuit and its some details. I'll program the whole thing myself but I want to know that initially how will i have to start and how the hardware components will be interfacing to eachother. I'll warmly welcome anybody's response.

6th December 2006, 01:46 AM
Sceadwian Experienced Member	The ULN2803 is a darlington array. Your motor only has 4 wires which means it's a bipolar stepper motor. You need h-bridge drivers on each line. Only unipolar steppers can be driven directly from a basic transistor driver. __________________ Curiosity killed the cat; That's why they have nine lives.

6th December 2006, 04:15 PM
House0Fwax Experienced Member	Try this site, it has all about stepper motors, bipolar ones included. I built the H bridge for a bipolar motor and it works fine. http://www.eio.com/jasstep.htm#intro

19th February 2007, 05:42 PM
jhouse New Member	Help Anybody help... We have this school project, we are making a electric fan controlled by PIC16F84A then goes through a stepper motor .. Anybody can give me a program that can be controlled by switches for the rotation of the stepper motor. For example (Sw - Switch) Sw1 is 45 degrees , Sw2 90 degrees, Sw3 180 degrees, and Sw4 360 degrees.. Can anybody lend some circuit diag. or configurations on how to construct this. My stepper motor has 5 pins. Thnx Email add. gangsta_lox@hotmail.com

5th October 2007, 10:57 PM
kerelektronik New Member	ucn5804B is a good alternative and completely logic based chip for controlling unipolar stepper motors, it s easier and more expensive way than ULNs..