[flip_switch]

The following are my stepper driver and stepper motor. The motor seems to be working fine and as I've figured out the black-orange and red-green form pairs, So the yellow and maroon are supposed to be center taps, right?
More I'm confused as to how I should connect it with the driver. The driver has about 5 points and I have 6 wires? How am I supposed to connect them in bipolar connection?

[john-100]

it will be easier to help you with the part number for the motor and the circuit or a photo of the reverse side of the "H"bridge

with a quick resistance test you can verify the yellow and maroon wires are the center taps and I expect will both go to terminal 3 in your photo
( I expect you will see the + supply terminal on the left is connected to the centre terminal of the 5 terminals on the right )

as it stands you will have no control of the motor current unless the power supply voltage is the same as that on the lable on the motor

in the past it was normal with simple drivers to have a power supply several times the motor voltage and use high wattage resistors to drop the excess in order to increase maximum possible the motor speed

John

[flip_switch]

it will be easier to help you with the part number for the motor and the circuit or a photo of the reverse side of the "H"bridge

with a quick resistance test you can verify the yellow and maroon wires are the center taps and I expect will both go to terminal 3 in your photo
( I expect you will see the + supply terminal on the left is connected to the centre terminal of the 5 terminals on the right )

as it stands you will have no control of the motor current unless the power supply voltage is the same as that on the lable on the motor

in the past it was normal with simple drivers to have a power supply several times the motor voltage and use high wattage resistors to drop the excess in order to increase maximum possible the motor speed

John

Thanks a lot for replying, John . I've attached picture of the reverse side of the H bridge and made the motor wire connections accordingly, but with no consequence. I supposed the 1 -> 4 and GND goes to my Arduino Uno digital pins and gnd.
And +ve to DC positive voltage. Although the DC output is 12V - 3A, is that the issue ?

[john-100]

Hi flip_switch

with the photos I see its not a "H" bridge and is four open collector transistor switches
(I am assuming they are NPN transistors and not FETs the part number will reveal all

the other thing to note the motor common is terminal 5 !

Attachment 341510

what's the part number for the motor ?

if you find the data for the motor - good
otherwise use a multimeter to measure the coils resistance

for example if its 100 ohm in total
the resistance between the centre tap and one end will be 50 ohms
the current will be
12/50 = 0.24A

full stepping at maximum torque that's 0.24A for each coil = 0.48 A total
full stepping energising only 1 coil motor current = 0.24A
a half stepping pattern alternates between 1 coil being energised and 2 coils


if the coils resistance is just a few ohms then you need to use some form of current limiting

the simplest being a high wattage resistor in series with the common wire

John

[flip_switch]

Hey John!
Couldn't thank you enough for the effort.
so here is my current configuration but with no avail.
In fact, when trying to upload program keep receiving error: "avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00"

I just don't get where I'm going wrong.

[john-100]

Hi flip_switch

I adjusted the contrast of your diagram and looks OK provided your using a low power 3V motor

Attachment 341564

not having used an arduino I think we now need the help of arduino programmer here on CNCZONE

I assume you are using a stepper driver program from the examples given in an Arduino starter kit

I would of thought its better to use a dedicated stepper driver - it would provide an easier way to use micro stepping

then you only need to use two arduino outputs to send step and direction signals to the driver
may be I'm missing something ?


John

PS

I guess this is what your trying to do

https://www.youtube.com/watch?v=S-KHU4eKoEM

https://www.intorobotics.com/tutoria...arduino-board/

[flip_switch]

Hey John !

I've currently swapped my previous drivers with A4988 Stepper Drivers.
And had been using this How To Control Stepper Motor with A4988 Driver and Arduino as reference.

Yet nothing works ! I can't figure out what's wrong

[john-100]

Hi flip_switch

photos of your setup will be useful

what happens when you apply the power ?

when the stepper driver is enabled the motor should be locked
have you double checked the motor connections are connected to the correct terminals ?

the enable pin needs to be grounded
the sleep and reset pins connected together - at switch on they will be grounded but after a delay go high (+5V) if you have a small capacitor between reset and ground

can you post a link to the schematic of the stepperdriver you have ?

if they are not exactly the same as in the tutorial you may need to connect the sleep & reset to +5V

to make the motor turn you only need the arduino to produce the step pulses



John

[flip_switch]

The schematic of my stepper driver is exactly same as in the tutorial.

As for when I apply power - Nothing happens, no sound or clicks.

As for terminal connections - I'm pretty sure I connected the right pair of terminals and comparing it with NEMA 17 model on which it is based I think it's correct.

Although I did not ground The Enable pin.
I'll do so and check it out.

Update:

John !
It finally works !!
You were right, I probably made some wrong connections the first time.
But thanks a MILLION for your time and patience !!
(Yeah! made my first motor work!.. albeit with a few jitters :P )

[john-100]

Hi flip_switch

did you get any instructions on how to set the motor current ?


with the power on
is there any resistance if you get hold of the motor spindle and try to turn it ??

may be the motor current is set to zero



now I have found the circuit of an A4988 driver
Attachment 343362

it should work with the sleep and reset pins connected -
an onboard pullup reistor will connect them to +5v
and another resistor should pull the enable down to ground

thats assuming your board is built the same way


during the last few days I have been looking at this electronic indexing head project
Snailworks Electronic Index Build Log
and found that not all LCD arduino sheilds are the same

some will damage the atmel chips output D10 if you attempt to use PWM control of the display brightness

also depending on the manufacturer you get different voltages on the analogue input A0 when you press the buttons !!

John

[flip_switch]

Hi flip_switch

did you get any instructions on how to set the motor current ?

No I didn't get any instructions about setting the motor current

with the power on
is there any resistance if you get hold of the motor spindle and try to turn it ??

Yes there is some resistance when I try to turn the spindle.

now I have found the circuit of an A4988 driver
Attachment 343362

it should work with the sleep and reset pins connected -
an onboard pullup reistor will connect them to +5v
and another resistor should pull the enable down to ground

thats assuming your board is built the same way

Yes, that's how I connected them

during the last few days I have been looking at this electronic indexing head project
Snailworks Electronic Index Build Log
and found that not all LCD arduino sheilds are the same

some will damage the atmel chips output D10 if you attempt to use PWM control of the display brightness

also depending on the manufacturer you get different voltages on the analogue input A0 when you press the buttons !!

John

Well thanks for this info, maybe that explains why the analog input gives really strange values in some of my other experiments.
I'll look into into the Snailworks Electronic Index Build Log