Hi !

I want to find a schematic showing how to drive a 5 wires stepper motor without Arduino and coding.
Beware it is a 5 wires motor (most schematics and chinese modules use a 4 wires model).

I have the motor 28BYJ-48 a very 5 volts popular model.
I use the ULN2003 driver module.
I need to control :

• The speed with a pot. (about 1 complete turn in 30 seconds)
• Stop/start with 1 button
• Direction with 1 button

Thanks in advance for your help

 

Maybe a 555 astable into a 4017 ic into the ULN2003, but to reverse the direction a 4 pole double throw switch between the 4017 and the ULN2003. But a processor is a simpler and less expensive solution

 

You can find a lot of useful information here (based on Arduino solution).

https://lastminuteengineers.com/28byj48-stepper-motor-arduino-tutorial/

 

You can convert that motor to a bi-polar configuration, then use an A4988 driver, not needing an arduino or cpu of any description.
Search online for the instructions. Basically, lift the tabs, slide the case back. Cut a wire, then it's bipolar and easier to drive.

 

L297 & L298 combo uses a pulse to drive stepper inteligentley

 

Or you can use a CD4017 Johnson counter to create a 4-phase sequencer for full step action. Half step will be a bit more tricky.

 

You can use the attached translator circuit to drive the ULN2003 board. All you need is a switch to ground attached to the Direction pin, and some form of pulse generator (a 555 timer?) to give you Step pulses. I haven't shown any decoupling capacitors on the circuit, you may wish to add a few. (Whoops, just noticed I've added pin 15 twice!)

 

The advantage with the L297 & L298 combo is that the motor current can be monitored and set at the motor rated value, Important!
The only issue is that is intended for 4 wire motors, which is generally the prefered types due to higher torque.

 

You can use the attached translator circuit to drive the ULN2003 board. All you need is a switch to ground attached to the Direction pin, and some form of pulse generator (a 555 timer?) to give you Step pulses. I haven't shown any decoupling capacitors on the circuit, you may wish to add a few. (Whoops, just noticed I've added pin 15 twice!)

Where is the ability to set motor rated current limit?
Important !

 

Where is the ability to set motor rated current limit?
Important !

Not needed if using that translator circuit to drive the ULN2003 module with the 5V, 5 wire motor. But it does work well with an L298 module and the motor modified for 4 wire mode. Motor supply needs to be at least 10V though, due to driving twice the resistance and four times the inductance.

 

For your five-wire 28BYJ-48, consider two microcontroller-free designs. The OSSteD – Old School Stepper Driver uses discrete logic and adjustable speed. Also see Driving a Stepper Motor Without a Microcontroller. Both offer useful starting points for your project. Your ULN2003 module can drive this unipolar motor. You need a potentiometer for speed adjustment. Add push buttons for start/stop and direction reversal. Verify both designs support these controls before building. Target approximately two revolutions per minute for your application.

Have you built either of these yourself?

 

Stepper Motor Forward And Reverse Testing circuit.

 

My first Instructable was
https://www.instructables.com/Driving-a-Stepper-Motor-Without-a-Microcontroller
Writte by a very beginner. Maybe it can give you some ideas.

 

All my stepper control circuits include the required tight/constant rated current circuitry included in the driver circuit.