Power Functions motors compatibility

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Power Functions motors compatibility

Postby withad » Sun Jan 23, 2011 2:29 pm

I was planning on buying a couple of these Power Functions motors but I couldn't find anything definitive about leJOS support for them. From what I can find, they don't have internal tachometers like the NXT motors, which I guess means they can't use the rotate() and rotateTo() Motor functions.

Can anyone confirm/deny that for me? Thanks.
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Re: Power Functions motors compatibility

Postby skoehler » Sun Jan 23, 2011 3:58 pm

withad wrote:I was planning on buying a couple of these Power Functions motors but I couldn't find anything definitive about leJOS support for them. From what I can find, they don't have internal tachometers like the NXT motors, which I guess means they can't use the rotate() and rotateTo() Motor functions.

Can anyone confirm/deny that for me? Thanks.


I have never seen the connector that this motor uses. It doesn't seem to be the old connectors, used by the RCX. Look at the cable, it has more than 2 wires. I have no clue, what these connectors are capable of, and whether there is an adapter for the NXT.

Edit: here's some info about the new connectors:
http://www.philohome.com/pf/pf.htm

Not sure, whether an adapter for the NXT is feasible.
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Postby Atr » Sun Jan 23, 2011 8:58 pm

You'll need:
- Converter Cables for LEGO® MINDSTORMS® NXT (http://shop.lego.com/ByTheme/Product.aspx?p=8528&cn=17)
and
- LEGO® Power Functions Extension Wire 20” (http://shop.lego.com/ByTheme/Product.aspx?p=8871&cn=587)

I have used this motor connected to NXT brick multiple times, for example here
http://www.youtube.com/watch?v=GUgwI9WrJ9o
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Postby withad » Sun Jan 23, 2011 11:01 pm

That's awesome, thanks. I'd found a lot of videos of people using the motors with the NXT brick but couldn't figure out how exactly they'd done it. The only tutorial I could find showing those cables only dealt with a particular kind of sensor. Good to know it's possible.

EDIT: One other question - this bypasses the need for the PF battery box, right? Because otherwise I'm not quite seeing how it all goes together.
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Postby skoehler » Mon Jan 24, 2011 12:07 am

Atr wrote:You'll need:
- Converter Cables for LEGO® MINDSTORMS® NXT (http://shop.lego.com/ByTheme/Product.aspx?p=8528&cn=17)
and
- LEGO® Power Functions Extension Wire 20” (http://shop.lego.com/ByTheme/Product.aspx?p=8871&cn=587)

I have used this motor connected to NXT brick multiple times, for example here
http://www.youtube.com/watch?v=GUgwI9WrJ9o


I can't tell, whether the 20" extension cable helps. Only the upper part of the two plugs is shown. However, the 8" cable looks slightly different (or at least you can see the lower part of one of the plugs), and I think it does the job:
http://shop.lego.com/ByTheme/Product.aspx?p=8886&cn=587

Also, it explicitly states "Allows you to connect your LEGO 9V electric systems to the new Power Functions!". The description of the 20" cable doesn't mention that.
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Postby Atr » Mon Jan 24, 2011 11:29 am

withad wrote:EDIT: One other question - this bypasses the need for the PF battery box, right? Because otherwise I'm not quite seeing how it all goes together.

That's right, PF motor is powered directly from NXT brick.

skoehler wrote:I can't tell, whether the 20" extension cable helps. Only the upper part of the two plugs is shown. However, the 8" cable looks slightly different (or at least you can see the lower part of one of the plugs), and I think it does the job:
http://shop.lego.com/ByTheme/Product.aspx?p=8886&cn=587
Also, it explicitly states "Allows you to connect your LEGO 9V electric systems to the new Power Functions!". The description of the 20" cable doesn't mention that.


Both cables will do fine. The dark gray plug is a new PF plug and the light gray plug is the old RCX plug. Both cables have them.
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