Simple PC/USB to Robotis bus interface

[ArnaudBuy]

Here's the quite simple schematic:



As i said in a previous post, this interface can work at 1 Mbps by setting the FT2232 baud rate prescaler to a value of 3 (the reference clock is 3 Mhz)

You can find the FT2232 schematic part on the FTDI webstite:
http://www.ftdichip.com/Documents/Schem ... 2sch10.zip

It can work with a USB to TTL Board embending FT2232(tested) or FT232R(not tested but provide the required I/O Pins options).

Arnaud

[Joe]

Great work, Arnaud! That does look simple. Thanks for posting it!

Best,
— Joe

[billyzelsnack]

Arnaud. Is this still working out for you? I think I might give it a go as my bricked CM5 is not going to get me very far! haha.

[billyzelsnack]

So this one should work as well and get the full 1M rate?

http://www.mouser.com/search/refine.aspx?Ntt=UM232R

[ArnaudBuy]

Yes, I think it should work with this chip since it provides the necessary 5 configurable Control Bus lines including TXDEN, rates capability and use the same drivers support.

Arnaud BUY

[JonHylands]

Arnaud,

I just noticed on the schematic posted in the first message - the ground and signal lines are reversed on the Bioloid 3-pin connector.

Ground is on one side, power is the other side, and data is in the middle...

- Jon

[ArnaudBuy]

Jon,

Thanks for the notice. Have updated the schematic.
On the other hand, DATA isn't on the middle, just inverted GND and VDD.

Thank's again,

Arnaud BUY

[JonHylands]

Wow, I guess I should have looked at the AX-12 manual... I just soldered up an extension cable for MicroRaptor yesterday, and I used the wrong sized wire for Vdd... Guess I'll have to fix that. :_/

Thanks for the update.

- Jon

[billyzelsnack]

Well. Here's my mouser order for tomorrow.



Anything else I should throw in there. I probably should find some nice high quality wire, but I'm too lazy.

hmm. Maybe a socket for the UM232R.

Very much thanks to Arnaud for the circuit. Also, thanks to Jon for the digikey numbers. It made it very easy to find them at mouser.

[JonHylands]

One thing I ended up getting on my latest Digikey order was 10 of the little power plugs the CM-5 has in it.

CP-002A-ND

I have one of those mounted on my ATmega128 board, which allows me to power the servos from the CM-5 power supply brick, which beats the heck out of constantly charging batteries, at least while MicroRaptor is tethered.

I'm going to mount them on MicroRaptor's board as well, so I can unplug the batteries at any time and plug in the brick if I'm working on the bench.

The corresponding plug that fits into the above one is:

CP3-1000-ND

- Jon

[billyzelsnack]

Good idea. Then I could actually use and charge (with a different charger) my battery pack since my CM5 is bricked.

[billyzelsnack]

Doh. Mouser doesn't have them. Oh well.

[billyzelsnack]

Now that I have more than 2 seconds to check I see you are talking about the power brick, not the battery connectors. haha.

Are you sure they are 2.1 inner? My caliper shows 2.5 inner.

[JonHylands]

The inner measurement is the pin in the middle.

I have these plugs, and they work...

- Jon

[billyzelsnack]

Ok. I'll get a 2.1. Thanks.