This is my first stepper motor project where the I have used NIPPON PF35T-48L4 unipolar motor which I controlled from a PC through the Parallel Port (LPT1, DB25). I simply used a ULN2003A IC which uses 7 Darlington Transistor Array to amplify the input current comming from the port. This 16-pin IC is capable to take TTL input and the output load may have high voltage upto 50V. I wrote small program in Visual Basic 6 using inpout32.dll driver.
Here is a screenshot for the unipolar stepper motor and the driver IC ULN2003A:
It is recommended to connect a 6.2V zener diode between the power supply and VDD (Pin 9) on the chip, to absorb reverse (or “back”) EMF from the magnetic field collapsing when motor coils are switched off.
To rotate the motor anti-clock wise, the step sequence sent to the parallel port is as follows:
STEP-1 0001 1
STEP-2 1001 9
STEP-3 1000 8
STEP-4 1010 10
STEP-5 0010 2
STEP-6 0110 6
STEP-7 0100 4
STEP-8 0101 5
Here is the live video of how the motor rotates:
Nice thinking… But let me know how far it is completed.
Hi:
Nice work!
Can you send me the Visual Basic code that runs this motor so I can see how it works ?
Thanks
James
hi
good job
can you send me the visual basic code that runs this motor
as i need this concept in my project
Looks awesome!
If you can send the VB code to me so I can un-commercially use it, that would be awesome!
@Sean: Use you multimeter. If your motor has 6 wires, it must be unipolar stepper motor. If 4, it is bipolar (no center pole). If you have basic knowledge on uni/bi-polar stepper motor, you can easily figure out the right schematic of your coils just using a multimeter. For more info about stepper motor, you can visit http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html
I have a motor similar to this but I cant figure out what leads go for what coil. How did you figure it out?
hi! nice work! but i would really appreciate if you
could also send me the visual basic code that runs this motor as i need the concept for our project. Thanks!
Hi! Mohammad
Can you tell me step by step how do you use Visual Basic program to make the stepper motor work ?
Email me , Thanks
Hi Mohammad bhaI,
How are U ? where is Pechali ? any problem or busy ?
Dear Mohammad: Good one ! Hope to see your upgraded one.. Thanks
Hello Mr. Mohammad
Can you teach me how to connect parallel port and runs in VB6, most site that I read connects only serial connection. Please I need your help. I have project that a stepper must run in an event in a Visual Basic 6 that uses parallel port. Thanks and more power.
@glyd: Let me rephrase your question. You wanted to learn “Parallel Port Interfacing”. If you are using an old PC, they have the 25 pin DB25 connector in the back. You may directly connect with it. I assume you are using Windows 98/XP. For the later versions, you may need some additional driver or different methodology. For XP, you need to download a driver inpout32.dll. I have come across with this tutorial which I thought is easy to understand. Check this out http://electrosofts.com/parallel/. The operating system is another important aspect to consider. I first started learning interfacing in Windows 98 using the DOS version of Turbo C++ 3.0. Then using inpout32.dll, I started doing it on Windows XP using Visual C++ 6.0. If you prefer VB6, check this out. They did with .NET. You may ignore the extra code they did for .NET. Just initialize the DLL at the top. And then simply use the inp and out functions. Just a couple of lines. http://www.codeproject.com/Articles/15020/Reading-from-Parallel-Port-using-Inpout32-dll. Let me know how it goes. You may post your comment here.