RoboSavvy Forum

Configuring GENE-QM77 to use on 1m tall humanoid

2013-01-08T19:11:06+01:00

I would recommend against using that USB to RS485 board for the following reasons:

1. It uses an SP485 RS485 driver/receiver IC. This does not have a failsafe receiver, so an idle line state is indeterminate. The USB2Dynamixel uses a MAX3443 which is failsafe.

2. The FTDI chip will always give you a 1ms latency on incoming data, so short read transactions never fill the 1Mbps bandwidth, never mind 3Mbps. Dynamixel bulk read helps by making longer packets, so delay can be reduced, but you are better to avoid FTDI devices to interface to Dynamixel Bus if you are looking for high performance.

3. The FTDI chip will cause a call to the the linux FTDI driver every 1ms (assuming minimum latency setting)even if no data is received. I never mix FTDI with linux.

My first thought on an alternative is the CM900, this can use CDC ACM protocol and avoid the FTDI issues. It is not clear from the CM900 schematic what RS485 interface chip they actually use. Maybe someone could check and report back here.

The other advantage of the CM900 is that you also have AX12 ports, and other assorted I/O available.

Statistics: Posted by i-Bot — Tue Jan 08, 2013 7:11 pm

Configuring GENE-QM77 to use on 1m tall humanoid

2013-01-08T17:14:59+01:00

Hi All,

A small update on this.

To connect the Robotis servos to the computer we are thinking of using this usb to rs485 it has a maximum speed of 3mbps, the same as servos.

we will try to use the broadcast message available on the robotis protocol and maybe controlling the servos at 100 times a second.

Statistics: Posted by nunogato — Tue Jan 08, 2013 5:14 pm

Configuring GENE-QM77 to use on 1m tall humanoid

2012-12-13T12:48:45+01:00

... Seems to be a nice board!!

The more processor power you have, the better. 8 cores is nice for other reasons... Hint, one will care about processor affinity in regards to threads... almost like having dedicated processors in a shared system.

With the net requirement of a "full functioning" biped being parallel task processing (vision, TTS / voice rec, sensory, motion control, etc), processor power matters a LOT.

Now, all you need is the right software, and you'll be all set!

Personally, I can't see going after a 1M bot. The simple truth for me is that the cost is prohibitive. Things get quite expensive as size increases. The answer for me is a small bot with tons of processing power shoehorned in.

Statistics: Posted by PaulL — Thu Dec 13, 2012 12:48 pm

Configuring GENE-QM77 to use on 1m tall humanoid

2012-12-12T11:22:56+01:00

The graphics were working fine, the problem was that the motherboard has this internal LCD (like a laptop) and it was active so Ubuntu was mirroring the screen to the VGA port and because the internal only had resolution up to 1024x768 I was with that resolution on my 1600x1200 screen.

To solve this we need to disable the "LVDS" graphics on the motherboard.

Now it only outputs through the VGA and DVI and already can use a decent resolution to configure the computer.

Statistics: Posted by nunogato — Wed Dec 12, 2012 11:22 am

Configuring GENE-QM77 to use on 1m tall humanoid

2012-12-12T11:25:38+01:00

Hi,

For the brain of the 1m tall humanoid we choosed to have a super computer

To accomplish that we will install the following hardware:
Motherboard: GENE-QM77
CPU: Intel® Core™ i7-3610QE CPU @ 2.30GHz × 8
RAM: 8GB DDR3 1600Mhz
DISK: 256GB Samsung SSD (830 series)
Wifi: TP-Link TL-WN722N

Currently we are on the initial testing, just installed Ubuntu 12.04.1 and still installing drivers and make everything work smoothly

I'll post here all the information needed to install the system on this system, I'll start by the operating system instalation, connecting to the servos up to running the DARwIn-OP framework on the robot.

Ubuntu instalation:

Just downloaded the Ubuntu 12.04.1, burned it into a CD and did the standard installation.

Found a problem installing the Wifi USB dongle due to a problem on the USB3.0 ports, the solution was upgrade the kernel to the last stable version, here are the steps needed:

Add repositories of Ubuntu 12.10 by editing “/etc/apt/sources.list”

Code:: sudo gedit /etc/apt/sources.list

and add following lines:

Code:: deb http://security.ubuntu.com/ubuntu quantal-security main universe restricted multiverse deb-src http://security.ubuntu.com/ubuntu quantal-security main universe restricted multiverse deb http://it.archive.ubuntu.com/ubuntu/ quantal-updates main universe restricted multiverse deb-src http://it.archive.ubuntu.com/ubuntu/ quantal-updates main universe restricted multiverse deb http://it.archive.ubuntu.com/ubuntu/ quantal main universe restricted multiverse deb-src http://it.archive.ubuntu.com/ubuntu/ quantal main universe restricted multiverse

Then update and install the kernel:

Code:: sudo apt-get update sudo apt-get install linux

After that we need to install the wifi drivers, for that we need to download the htc_9271.fm firmware from here and copy it to the lib/firmware/ directory. Next, download the compat-wireless drivers from here Unarchive it and build the ath9k_htc driver by running the following commands in order:

Code:: tar xvf compat-wireless-3.6.8-1.tar.bz2 cd compat-wireless-3.6.8-1 ./scripts/driver-select ath9k_htc sudo make sudo make install

Load the driver

Code:: sudo modprobe ath9k_htc

Now we have Wifi running so we can go for the next step that will be trying to get the graphics driver work properly, that's for a next post

Regards,
Nuno Gato
--RoboSavvy

Statistics: Posted by nunogato — Tue Dec 11, 2012 7:51 pm