3500 and hall encoder question.

12 years 8 months ago #22730851 by reece_james
3500 and hall encoder question. was created by reece_james
Hey guys,

We've recently bought the ax3500 for a robotics project and are at a bit of a loss how to hook our motor's hall encoders up to the card.
www.transmotec.com/PDF/Motors_Planetary_...D_Encoder_Option.pdf
As far as we could see, it should be one to one, but we're not getting any readings in the Roborun software. (We assume that it's just connect it up and off it goes, there isn't very much written about hall encoders in the manual)

Any help would be greatly appreciated.

Cheers,
Reece

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12 years 8 months ago #22731659 by cosma
Replied by cosma on topic Re:3500 and hall encoder question.
The encoder will be connected to the RJ11 connector. The easiest is to take an already built ethernet cable. Cut it, strip each individual wire, and connect them to your encoder.

Pin 3 of your encoder goes to the 5V output
4 to Gnd
5 to encoder1 (or 2) input A
6 to encoder1 (or 2) input B


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12 years 8 months ago #22731808 by reece_james
Replied by reece_james on topic Re:3500 and hall encoder question.
Hmm, that's how we had it wired up. :/ So that bit's fine.

The encoders are definitely generating a signal, we're not getting anything in Roborun. Is there something that we need to setup beyond entering the PPR value? Also does open or closed mode matter when just testing encoder output?

Thanks,
Reece

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12 years 8 months ago #22731860 by cosma
Replied by cosma on topic Re:3500 and hall encoder question.
You do not need to set the controller in Closed Loop for testing with Roborun. In fact, it is better that you do the first tests in open loop.

You do not need to worry about PPR yet either.

Just click on the Encoder tab and click on the Run button.

You should see the Switch 1 / 2 changes as the A & B logic level change (3/ 4 if encoder 2 is wired). If you dont see any change, then check with a voltmeter that your see a 0 and "1" level. "1" is 2.5V or higher.

You should also see the Counter Value change as you rotate the shaft (whether or not the motor is connected)

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12 years 8 months ago #23381690 by reece_james
Replied by reece_james on topic Re:3500 and hall encoder question.
Thank you so much for all your help. We worked out how to get it working in the end. Mainly our own inexperience more than anything. Upon purchasing an oscilloscope and adding a pot to the encoder channels we solved the problem.

Once again thanks for the help, especially considering it was Christmas! Love the 3500!

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