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Update: I've posted a new for those who are using the new design.A quick tutorial on how to get things up and running with the Stepper Motor Driver Board. A big thank you to Brian Schmalz, the designer of this board. It's obvious why he has called it the EasyDriver. It was indeed, an 'EasyDriver' to set up;)PLEASE NOTE: some people have overlooked the extra (ground) pin on the easydriver board. It is not labeled on the board itself, but it is visible as the top right pin in the picture above. Grounding the easydriver board is essential but sometimes overlooked by newbies like myself:)WARNING Easy Driver v4.2:Please do not attempt this tutorial with new Easy Driver v4.2 board. Please consult the QA for version 4.2 on the for explanations on 4.2's extra functionality.
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For more information you can always look at the and as well.Here is a copy of the code used in this Video. Said.Hey Mike, I guess it comes down to the hardware in the end.
I found that anything under 80 and my stepper struggles. Acceleration is also a contributing factor. Eventually, I plan on checking out the library to see if I can get the motor to go faster when using a slow logarithmic acceleration curve to 'ease in' to top speed. Personally I'm thinking if it's speed you want, then maybe microstepping is not the best solution.
If you are game enough and have a steady hand, you might be able to modify the board. The chip is capable of doing full and half steps as well. But the ED3 board isn't set up to do this. Said.Samuel,Just add an extra delay after you pulse the motors high. So delay an extra 10,000 microseconds (10ms) after you pull the step pin low. I'm using an ATmega128 microcontroller in my project so I just pulse the pin high for 100us, leave it low for 100us, and continue to leave it low for any extra delay I wish to have between steps.
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I recommend creating a 'step' function that pulse high for 100us then low for 100us. After calling this function you can add any delay you want before the next call to it. KzCorpsaid.Hi Daniel, how do you do?I buy a EasyDriver v3 board in Sparkfun.com.
I'll build a PCB laminator like this: www.py2bbs.qsl.br/laminador.php but with the easydriver and a bipolar stepping motor.The only function of the motor is spin very slowly in one direction. Pleasy tell me what can I do to do this?
I have to add a 555 generator for the step input? And what i have to do with the dir input?I don't understand nothing about stepping motors and driver. Pleasy help me.Thanks a lot.Best regards.from Brazil.KzCorp®.P.S.: forgive me my poor english. Said.KzCorp,I have not had any experience with the motors you are using so I cannot comment on that.maybe posting your questions on this forum will help:can't see why you would need a 555 timer for any reason as the arduino takes care of all of pulses for step and direction pins.I'm no expert on stepper motors either, but there is a lot of info on the web if you do a search.Good luck!Dan.p.s.
Remember that the easydriver does microstepping so it may seem slower at first than drivers that do full step increments. Said.Hi all.Dan, thenks for your nice tutorial.sorry for my english;-)I want answer Samuel.Yes; it is possible to make slow steps!!Hi have a problem that his Stepper motor not make microsteps but only big full steps.To undestand it you must undestand the theory of microsteps and the Allegro A3967.Full Step: everytime 2 winding of the stepper motor are on.Half step: between 2 full steps is a half step who is given current to only one winding. This make that the rotor rotate a half step.In both case (full and half steps) the current can are limitated to the winding resistance. Not necessary by the driver circuit.Quarter step It is used a limiting the current of the motor by the chopper mode of the driver. When you look 2 windings: the current is sequential: 100%-0%, 92-38, 70-70, 38-92, 0-100 of Imax (setting point with the adj pontentiopmeter on Easydrive) In this way the rotor make steps between half steps.Eighth step or more: the motor current is modulated by the driver in a bigger number of steps.ok this is the theory. Now the solution of the problem.If the stepper motor is a motor with a highter resistence (20 ohm or more) the Alegro A3967 cannot limit the current in the windings to make a eighth step bycause the current is limiting by the resistece of the motor winding not by the chopper function of the driver.Example: The max current of a 50 ohm motor on 12 V is 240 mA.
The limit of the driver is set to 750 mA. The first eighth step are 140 mA and 735mA. This value are not the current of the motor. The motor current are 140 mA and 240mA.
The motor make a big step not a small eighth step (aproximatly a half step).To resolve this problem:You can try to limit more the max current (turn the limit to lower value, up to 150 mA), use a higher power supply (you can use up to 30 V) or use a other model of stepper motor.I hope my explaning is comprehensible and helpfull.in peace Uwe.A nice page that explan microsteps:http://www.zaber.com/wiki/Tutorials/Microstepping). Said.With regard to the delays surrounding a STEP pulse.
I have found it unnecessary to add any 'high' delay. I just have two consecutive lines of code that say 'stepPin HIGH' then 'stepPin LOW'.Mike commented earlier that the docs for the EasyDriver say it only needs a 1μs pulse. Given that the Arduino takes longer than that to execute a line of code I figured it was not a problem.I am of course using a longer delay after the pulse to control the speed of the stepper. I've had it down to about 70μs running happily but it must be noted that you can't go from standstill to a 70μs step cycle - the motor will stall. You have to ease your way up there.hthm. Marcelsaid.I read this recently.talks about the speed at which Arduino processes it's DigitalWrite commands (that we use for stepping).This chap is using C commands instead of DigitalWrite and seeing a 10x speed increase!!I haven't played with it yet and I don't know what effect it might have on the sort of step commands we're using but it might be worth a play.i.e. It may need some delays to be added along the way to make the steps long enough for the driver board to pick it up but it may free up time for more axis to be added without hindering each other.Maybe one day I'll get to play!
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If anyone else can give it go and report back it would be useful to all I think.m(having problems posting with my blogger ID). Here's my latest test video.It's just a few closeup tracking passes with my developing rig.The biggest develpment recently has been offloading the control and move-setup side of things to my computer rather than (as I had been) developing a handheld controller with LCD screen. The reality was I was spending excessive amounts of time in getting the setup and control part working and not refining the code that does the actual moov.Now I just pass a bunch of numbers to the Arduino down the USB and it gets on and does the magic.
Much quicker but I do have to lug a laptop around on the shoot. Swings and roundabouts.In time I'd like to replace the USB cable with a Bluetooth link. Apparently it's easy to do, but it requires £40 that I don't have right now!I'm presently awaiting two EasyDriver v4.2 cards which will replace the 'one-way-only' v3.1 card that's currently running the track moves, and open up PAN! — which I've yet to build;)Further to that I'm wondering about doing TILT with a servo - which I've got on hand already so it might be worth a play. Said.Hey Dan, funny that we just met last week at the hackerspace meeting, and then I stumble onto your blog while looking for information about the EasyDriver board I just from SeeedStudio.com;)After playing with it using your Arduino sketch, I quickly discovered that microstepping completely obliterates any torque in my ex-scanner stepper motor, so I attempted to modify the board to ground MS1 & MS2 to select full stepping. I seem to have been successful. Here's a photo of the modified board.I notice that when the Arduino is resetting it causes the motor to move a few steps.
I might not have noticed this before because most of the steps under 8x microstepping had no effect. Perhaps I need a pull-down resistor on the step pin.
Alansaid.Thanks for that Dan she's all going now with a ED3.1But could you tell me how to make a stepper motor only turn xnumber of turns then stop, every thing I try and the motor keeps turning as the code keeps looping I have searched every where and still no luck. Example I flick a switch and the motor moves one turn clockwise I turn the switch off and the moves one turn counterclockwise I am sure it's not that hard but I have spent far to long on it and need a helping hand on this one.ThanksAlan. Said.Hi Robert,I've never heard of a stepper motor stalling at slow speeds. Usually they stall when acceleration is to steep or the speed is too high for the motor/power supply combination.delayMicroseconds(200); is the line you need to play with for speed changes.you might want to try the delay command instead of delayMicroseconds.if you look at the the description it says:'For delays longer than a few thousand microseconds, you should use delay instead.' Here's the docs on how to use delayluck with your findings!Dan.
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