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61
Misc / [advertisement] MASSIVE National Robotics Week Sale!
« Last post by ServoCity on April 10, 2017, 02:26:26 PM »
We're celebrating National Robotics Week this week with a MASSIVE Sale!


Sale includes, but not limited too:
  • 20% OFF ALL Hitec servos
  • 15% OFF select Futaba servos
  • 65% OFF servo extensions
  • 15% OFF Batteries
  • 30% OFF Actobotics
  • FREE Shipping on orders over $50
  • and TONS more!

VISIT https://www.servocity.com/!
62
Hello, people!

I'm designing a hardware containing the mbed and the WIZ610WI wireless module, and I want to connect those using a RS232 interface. But the wireless module requires a 5-wire connection, with the RTS and CTS lines, and I could not figure out how to use these connections with mbed UART.

Can anybody show me a way to configure a serial port in mbed that includes RTS/CTS? Would it be fatal for the aforementioned purposes to ignore these lines in my design?

Thanks in advance!
63
Software / Re: Android robot control app
« Last post by klims on April 08, 2017, 05:38:09 PM »
Whoops, accidentally double posted.
64
Software / Re: Android robot control app
« Last post by klims on April 08, 2017, 05:31:14 PM »
I've written a new version of this app for anyone who is interested.

Info can be found here
65
For Sale / Boe-bot for sale
« Last post by timekiller2009 on April 07, 2017, 02:14:34 PM »
i have a like new boe-bot for sale i opend it all parts are there it is made by Parllax inc  it has a BASIC STAMP 2
microcntroller and board of education project platfrom looking to sale for $70 to lower 48e-mail me if you want to work out a sale. [email protected]   thanks
66
Mechanics and Construction / Use of linear actuator to rotate a part
« Last post by ebrb1326 on April 01, 2017, 09:18:15 PM »
Hi all, new to the forums.  I've been racking my brain for days on on how to use a linear actuator to cause a part to rotate 180? on axis with the actuator.  It's similar to this youtube video I found using a high helix lead screw, but some of these lead screws have high static loads in excess of what my actuator can provide.  Ideas?  I'm open to anything as long as it's really compact.

67
Misc / Re: I want ideas on how to get funding to start robotics development
« Last post by MrWizard on April 01, 2017, 02:10:11 PM »
Kickstarter or gogetfunding, gofundme are some crowdfunding websites. There are also some big funders, but then you need to have a nearly or completed project with a practical usability (many people might need it), even for crowdfunding. In every case you need a good documented and clear goal, with a good and smooth presentation.

68
Software / Autonomous Dynamic Collision avoidance robot
« Last post by k31453 on March 30, 2017, 12:33:40 AM »
Hi Guys ,

I am new to robotics world. I have project in mind which I wanted to for a long time.

So here it goes:

I am building robot that do this:


  • Move around automatically indoor.
  • Map of the floor or the building is predefined.
  • If there is obstruction it will avoid it and continually moving towards goal.
  • The destination is not straight line ( it maybe in another room)
  • Vehicle is using all four wheels for rotating and moving around (rather then 2)
  • Project is very small scale (about $500 project)



Now what I have done so far:


  • I started of by investigating different navigation strategies:
  • I am interested in following strategies:

  • Kruusmaa: Global navigation in dynamic environments using case-based reasoning," Autonomous Robots
  • Mateev : Real-time navigation of mobile robots in problems of border patrolling and avoiding collisions with moving and deforming obstacles
  • CWang: A Real-time Obstacle Avoidance Strategy for Safe Autonomous Navigation of Intelligent Hospital Beds in Dynamic Uncertain Environments


I am more leaning towards Cwang strategy but they implemented larger scale. I wanted to implement that but in smaller scale just to proof a concept.
  • I want to know whether raspberry Pi capable enough to fulfill these requirements.
  • If it is, how can I able to map the environment or MAP ( for e.g. map of the office)?
  • Will ROS software capable of it ?
  • Can it be connected to Raspberry Pi ?
[/list]
69
Mechanics and Construction / Mike, the robot
« Last post by hoela4075 on March 16, 2017, 11:45:13 PM »
Hi!

I am new to this site, and I appreciate all of the help that I can get.  I have for decades wanted to build a Tod Loofbourrow Mike, from his book "How to Build a Computer Controlled Robot" using the Kim-1.  The problem that I am having is finding drive wheels.  The motors that he recommends in the '70's are no longer made.  I don't want to screw this up, so what motors do I use?

The motorized wheels, directional control motor, and controlflex ribbon switches are all originally from Herbach & Rademan, Inc.  But I don't think they make any of these items any more.  The motorized wheels were catalog number TM20K370, the directional control motor was a 6-12 VDC motor geared reducer (catalog number TM20K407) and the switches were catalog number T5-01Z.

I believe the motorized wheels are 12 volt stepper motors, but I can provide schematics to prove that (or to prove wrong).  Not sure about the rest...any help is appreciated!  Most importantly, where can I buy these motors and switches?  I have the Kim-1 with expansion and would love to build this vintage kit.

Thanks!
Aaron
70
Electronics / Info on Panasonic Servo Motor
« Last post by vinnygalbo on March 15, 2017, 09:31:57 AM »
I have a linear drive unit designed by Hirata Robotics. It uses a Panasonic Servo Motor with the following label:

Model: MQMA042F2G
Serial: 79100586

http://www.clrwtr.com/PDF/Panasonic/Panasonic-A4F-Servo-Motors.pdf

I converted the connector to the standard 11-wire encoder plugs plugged it into a good driver and it jerked like crazy and the motor faulted and it got hot. I searched many manuals for Hirata Robotic actuators and found most had a default encoder resolution of 1500 PPR. The default setup on the Panasonic amplifier is 2500 PPR. Which would explain why it jerked it could not find the correct positions. Does anyone know if the standard Panasonic driver can be adjusted for this lower encoder count?

Thank you in advance for any guidance.
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