28 BYJ-48 motor - ULN2003A driver GUYS i have this motor and its drivers so can i connect arduino mega at the same time ? actually i want to control all motors according to input?
https://www.direnc.net/28-byj-48-reduktorlu-step-motor-ve-uln2003a-step-motor-surucu-karti-surucu-ve-kontrol-kartlari-china-29337-52-B.jpg
so my question is briefly are 6 motors connected arduino mega directly ?
Don't know if they are connected directly. Did you connect them? Then tey probably are. Otherwise they minght still be in theit platic bags. Who knows?
Yes it is possible to connect 6 stepper motors to a Mega.
Your choice of drivers is a poor one however so expect voltage drops and limits to the performance.
Do NOT connect VCC from the MEGA and use a seperate PSU with a common ground.
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Other general help and troubleshooting advice can be found here.
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ballscrewbob:
Your choice of drivers is a poor one
The ULN2003 is the standard driver for 28BYJ-48 stepper motors.
...R
Robin2:
The ULN2003 is the standard driver for 28BYJ-48 stepper motors....R
There are better available though.
A lot of people who use the cheaper 28BYJ's or similar soon realise they are often better off with something else and end up with a batch of ULN's sitting somewhere doing nothing.
ballscrewbob:
There are better available though.
What do you suggest? I have only tried the ULN2003 with my motors.
...R
So use them. I have 16 connected to 64 IO pins, and a separate 5V supply to power them.
Top, motors all turning.
Bottom, with Christmas decorations for loads.
They don't go very fast tho. 15, 16 revolutions per minute.
If the pulses driving the coils are shorter than 1672uS or so, they either won't start moving reliably after a stop.
I've only tried them with a 5V supply
You can drive them with TPIC6B595 also.
Or use discrete N-channels for the coil drives.
I don't think this demo was optimized for speed
