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Electronics / Motor Controller Configuration
« Last post by ProjectM on December 08, 2016, 05:34:48 AM »
Hi everyone,

With a group of students we are building an exoskeleton for paraplegics. I am part of the Software & Control department and we are designing the motor controller configuration. We have several requirements:

  • Size is one of our main requirements. We want the Exoskeleton to be as slim as possible, so this is true for all the components as well. We want the motor controller to be as small as possible.
  • The motor controller has to work with a brushless DC motor.
  • A setpoint will be sent from a microcontroller to the motor controller
  • Two or three absolute encoders need to be connected, this depends on the design of the joint.
    *We are either going to use position or torque control
    *We need one encoder for the motor angle, and one for the joint angle. We might implement Series Elastic Actuation in our joint and then we want to be able to measure the deflection in the spring and thus need two encoders for that.
  • A continuous power output in the range of 700 - 1200 Watt

While exploring several off-the-shelf possibilities, we came accross the Elmo Gold Twitter( and the IOMI Pro( One of the problems of these boards, is the amount of absolute encoders that can be connected. Both the Elmo and the IOMI board can either have 1 or no absolute encoders connected.

We came op with a solution, so that we are able to connect multiple encoders. In our exoskeleton we are going to use an EtherCAT Master-Slave configuration. The High-Level control (e.g. state-machine) is on the EtherCAT Master and sends joint angle setpoints. Our idea is to use a EtherCAT Slave as a sort of second controller, which gets the joint setpoint and the joint encoder values, calculates the motor setpoint and sends this out to a certain off-the-shelf controller like the Elmo Gold Twitter or the IOMI Pro.

My question is the following: Is this even a good solution? And what are other solution to this problem? Are there even better alternatives for a motor controller? Might it be a better idea to build and program your own motor controller? (please bare in mind that we have limited experience in that area)

I thank you all in advance for your reply!


Misc / Quadruped Robot on Kickstarter
« Last post by yosheli on December 06, 2016, 07:29:51 PM »
I'm a long time robot builder and first time product maker. I just launched a Kickstarter for a Quadruped Robot, you may have seen the ad I've run on this site.

In any case I wanted to share it personally on here, and to address any questions. Here is the link.

And some technical specs for y'all...

Actions: Walking, Balancing
Battery: Single cell (3.7V) liPo
Chassis Design: Custom 3D printed, PCB based frame
Motors: Digital, Metal gear servo, 2.5kgcm stall torque, 12 total
Controller: Custom design, Arduino Leonardo based
Onboard connectivity: Standard Arduino comms + Bluetooth
Programming: Wired or bluetooth
Battery Life: 45-90 mins
Charging: Integrated, via USB

I do hope you like it, feel free to ask about it

Electronics / Advanced Humanoid Robots for Sale Today
« Last post by carloliu on December 05, 2016, 04:32:58 AM »
Cookid Robot  is the fifth iteration of the platform developed by French company Cookid Robotics and released in 2014. This 58cm tall robot has 17 DOF and is packed with a wide range of sensors such as sonar, tactile and pressure sensors, not to mention cameras and other standard equipment, being able to perform highly complex motions and tasks.

Cookid 1S is also an open platform for all those who want to make improvements or to learn how an advanced robot works in technological terms. It can also be used in education and research as study material or platform for developing new generation of humanoid robots.

The robot comes with a powerful brain, the main CPU is an Intel Atom with 1.6GHz running the Cookid 1S and the associated programming framework. There is also a second controller which handles hardware level functions The robot can recognize shapes, people or voices. Captured images have the best resolution thanks to the two HD-resolution cameras, which yield good performance even in low light conditions. To understand what the user is trying to transmit through words, Aldebaran has created a technology called Nuance that translates sounds into robot commands.

Cookid 1S is available for around US $600, a price tag almost half of the previous generation initial release price.

Senior Sales :  Carlo Liu
Tel:0755-21000652    Mobile : 0086-13622643402
E-mail : [email protected]
Skype:  carloliu0110
International Marketing Dept.
Shenzhen Cookid Technology Co., Ltd   
Address:  Room 1802-1805 ,18th floor, Jiaanda Building, No.111, Huafan Road, Dalang, Longhua New District , Shenzhen, China
Misc / Re: What would your ideal robot look like?
« Last post by ropola on December 04, 2016, 05:38:28 AM »
Ok Tommy. So, what your ideal robot should do?
Robot Videos / Robot Fighting Tournament Highlights
« Last post by TreasureCoastMakerSpace on December 02, 2016, 10:55:33 AM »
Hi everybody! We are Treasure Coast MakerSpace, an engineering workshop based out of Port St. Lucie, Florida. We host robot fighting competitions regularly that are open for anyone to compete. (People from around the country have showed up to our events!) After hours of editing, we present our full tournament highlights video! We hope you enjoy over two hours of metal carnage! If you want any information on the event or about us, check us out at

Misc / Re: What would your ideal robot look like?
« Last post by Tommy on November 30, 2016, 03:36:35 PM »
What would your ideal robot look like?
ropola, to me, it's not about looks. but with that said I do find beauty in gear boxes
and bearings. to me Robots are all about function. doing what we can't or shouldn't.

Misc / Re: Mechanical vs optical/software shape recognition - need some guidance
« Last post by Tommy on November 30, 2016, 03:15:45 PM »
go down the software shape recognition path or going with what I know would be expensive, limited by space, and time consuming to build (mechanical).

In a factory setting it's best to look at the skill sets of your maintenance personal
when looking at automating operations.

Electronics / Re: Lovotics – A New Robot Race that can Love!!
« Last post by gtabasso on November 29, 2016, 12:47:23 PM »
You need to read The Silver Metal Lover by Tanith Lee. One of my favorite books about a robot who loves and a human who falls in love with this android.
Misc / [advertisement] CYBER MONDAY DEALS!
« Last post by ServoCity on November 28, 2016, 10:11:29 AM »
Cyber Monday deals are now live with HUNDREDS of deals including 25% Off Hitec servos!

See hundreds of more deals here!
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