Firmata and stepper motor ... about arduino HOT 13 CLOSED

Yes, currently the EasyDriver, and 2 and 4 wire hbridge driver configurations are supported. Issues have been reported for the pololu driver but there is work being done to add support for the pololu driver so hopefully that will be resolved soon.

You'll need to clone or fork Firmata and check the configurable branch. Load examples/ConfigurableFirmata. Or you can also use my AdvancedFirmata version (but this will be deprecated once ConfigurableFirmata is merged into the Firmata master branch). You can find an example client implementation here: https://github.com/soundanalogous/Breakout/blob/master/src/io/Stepper.js

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Ok, thanks a lot ! I'll take a look and i'll close the issue if i have'nt other question ;)

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Hoan, it's really cool ! So,i have an other question : how can i use breakout.js only with nodejs ? (whithout client side)

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You can't. BreakoutJS is a client-side JavaScript library. If you want to use nodejs, use johnny-five.

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oups, i miss that, my mistake ... and johnny-five can drive stepper
motors too ? thanks for you reactivity

On Tuesday, June 4, 2013, Jeff Hoefs wrote:

You can't. BreakoutJS is a client-side JavaScript library. If you want to
use nodejs, use johnny-five https://github.com/rwldrn/johnny-five.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/61#issuecomment-18940847
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__ Forestier Nicolas _______________________________*
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• @ : [email protected]
• tel :* *06.83.13 .92.08
• site : http://www.nicolasforestier.net/

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Not yet. Stepper support is a new addition to Firmata (it is not yet even in the Firmata master branch) so it has not yet been added to many Firmata client libraries. In addition to BreakoutJS, stepper support is available in an experimental version of Maxuino (Firmata for Max/Msp) and I think it may be available in the dev or maybe even master branch of perl-firmata.

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I'm doing some tests with bipolar steppers but I meet the following problems :

• Stepper is loosing steps, even with very slow speeds and accelerations
• Stepper quickly becomes very hot
• I need to manually reset the board (with the reset push button) each time I close the serial communication.

Did I miss something or do you observe the same behaviour?

More informations about my configuration :

• 4 wires hbridge driver configurations (as explained here)
• Arduino Uno and Arduino Mega boards (with ConfigurableFirmata inside, including all features)
• I use the "Alternate approach" protocol

Note: Other features, such as INPUT, OUTPUT, PWM or SERVO, are working fine.

Last question : Is there a way to properly "detach" the stepper ?

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I can't imagine how the Firmata stepper library is making your Stepper hot (in general a stepper will get hot, especially if you are driving a load). However it should not get extremely hot (like starting your table on fire hot). It could to be an issue in your circuit or improperly powering your motor (I use this motor and have not had any issues). Have you tested the same circuit without firmata (writing a regular Arduino sketch)? I use the circuits from pages 12 and 13 of this document.

I haven't observed any missed steps using ConfigurableFirmata with BreakoutJS. I don't have to reset the board either (but BreakoutJS works differently in that you only connect to the serial port once and then refresh the browser to perform a soft-reset of the board). I'd have to know more about your particular Firmata client implementation to know whether or not the stepper protocol is implemented correctly. Do you have a link to the code?

There is no "detach" method if that's what you're asking. However, you can send a SYSEX_RESET command (0xFF) from your client application to perform a soft reset of the Arduino board. This will reset all of the digital pin modes to output and free up the memory allocated by the array of stepper objects. Line 109 of ConfigurableFirmata.ino will call reset on all included features that implement the reset method.

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It works fine with 2-wire configuration (the problem was probably my circuit).

The stepper is still hot (about 100°C) but as you say it must be normal.
I'm using a MITSUMI M35SP-11NK that I found in an old printer (96 Steps per rev., bipolar, 12V DC).

Last problem : I still need to manually reset the board if I want the stepper to work after closing the serial port. I tried to reset the board after opening the serial port but it does not work. I will continue my tests.

Thanks again !

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The reset issue is fixed in this pull request. Also note the change on line 153. This was previously sending the stepper pin mode (0x08) rather than the stepper data command (0x72). Should have been 0x72 which is the unique value to identify stepper motor data.

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Thanks you for the fix.
Do you think the pull request will be integrated soon in firmata / arduino / Configurable ?

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Should be soon. I just want to be sure that the change I added was the best approach.

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This has been merged into the configurable branch.

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