Hello i want to make a braille watch and for this i had the idea to use mini steppers motors (link:https://www.ebay.fr/itm/5pcs-Miniature-10MM-2-Phase-4-Wire-Stepper-Motor-Brushless-Motor-Copper-Gear9H/223031734017?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 link 2:https://www.ebay.fr/itm/10x-Micro-Screw-Stepper-Motors-Miniature-2-phase-4-wire-step-motor-driver-ZJZY/323329345415?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 )
so i need to use 4 of this and i need to control them with the tiniest thing possible like an Arduino mini or nano but i don't know if its possible because on internet i only see that
one steppers take 4 pins and a nano only have 6 PWM so i need some help thanks you .
Have a look at this , I’d suggest you buy the bits and have a play
You don’t need the PWM facility of the digital outputs , so u have loads of pins.
I think you should be able to set the analog pins as digital outputs and that work too ( not tried that )
yes i already order few different steppers and if i understand the 22 I/O pins can me use like on/off button ? ( im a real newbies )
I don't know what stepper motor driver you should use with those tiny motors because they will draw very little current. Something like a Sparkfun Easydriver seems like overkill and it may not be able to limit the current to a low enough level.
The website says the motors are rated for 3v so it would be useful to connect one of the motor coils to a pair of AA alkaline cells and measure the current while the motor is stationary.
You can use a pair of H-bridge circuits to control a stepper motor but then you must only use the specified voltage and many of the h-bridge devices won't work as low as 3v. The Pololu DRV8833 will and it is a dual h-bridge so on its own it can drive one motor.
HOWEVER, if you use a h-bridge rather than a specialised stepper driver each motor will require 4 Arduino I/O pins so 16 pins for 4 motors.
Stepper Motor Basics
Simple Stepper Code