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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 ?
Mechanics and Construction / Mike, the robot
« Last post by hoela4075 on March 16, 2017, 11:45:13 PM »

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.

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


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.
Misc / Tech Tip - Can your servo handle this?!
« Last post by ServoCity on March 13, 2017, 09:24:53 AM »
In this Tech Tip video Brian demonstrates how ServoBlocks? increase a servo?s load-bearing capabilities by helping to isolate the lateral load from the servo spline and case. The extreme versatility of ServoBlocks? allow users to create complex, extremely rigid, structures with ease.

I created a javascript program that can talk to me. It is highly intelligent, and can even answer math questions. So now, I want to find funding to develop robots by myself; work for myself.

I want funding. A few methods of fundraising I found are email advertising, free shopping carts online, and donation oriented web pages. I have accounts to all of these methods, but I'm still looking for that special something to trigger my development.


Electronics / Help Beginner Here with zero experience on Mx-64 & CM-700
« Last post by MelvinTan97 on March 10, 2017, 02:27:36 AM »
Hi i just recently got into robotics and i'm very confused on how to control mx-64 and use pcb cm-700.
1. What software do i download?
2. Is the software downloadable from the LN-101 USB DOWNLOADER?
3. Do i follow from the USB DOWNLOADER and trouble shoot from there.
4. Is it possible to control 2 mx-64 actuators

Mechanics and Construction / Actuators too small to simulate human arm?
« Last post by Michael7S on March 07, 2017, 03:55:08 PM »
To simulate human arm action,  I can build an aluminum test cage and the arm that pivots in the same dimensions as an adult human arm.

Actuator choice will be pivotal ( ;) ) to design of the arms and I could use some pointers on which style/sizes of actuators would be a good starting point.

Some more info: The arm action simulates the plunging of a 12 pound tool, e.g., a soil tamper or post hole digger, for up to 36 inches of vertical travel, at the 'hand'.  Simlar to this video:
  The cage can remain stationary.   Ultimate goal is to measure the impact force of various designs of hand-operated soil compaction tools.

Thank you for pointers -- either to devices or places where more research can be done.  Most of my searches have included terms like "simulate human arm" and "actuators for axial acceleration" among others, but the results seem to be focused on human performance and medical. 

Electronics / Will this still work with a more powerful dc motor?
« Last post by byrlle09 on March 02, 2017, 07:35:26 AM »
So I have this project(RC Multipurpose planter with solar panel) for my final year in mechanical engineering, and i have been researching on electronic schematic diagrams. I don't have much knowledge on making circuit diagrams so i searched for one.

And this is what i have found, a simple and small diy remote controlled robot schematic diagrams. (See site and pics) (Credits to the publisher)


Transmitter Circuit:

Receiver Circuit:

It is relatively simple and easy to build. I think this is gonna work for my project.

I'm gonna need a larger dc motor since the weight of my robot is about 30kg (about two 40W power of a 12VDC motor)(Moving at 2km/hr)
And im gonna add a solar panel for recharge-ability and sustain.

My questions are:
1. Will this still work and not fry up even if i use a larger motor? (Since ill have a larger motor, ill have a higher amperage for a constant 12V DC motor)
2. How do i configure this circuit to meet my required power to drive my 30kg robot.
3. How and where do i install my solar panel?
4. Any recommendations?

Misc / GTF ROBOTS Omni wheels
« Last post by GTFRobots on March 01, 2017, 05:02:11 AM »
GTF ROBOTS has been in design, manufacture and supply of robotics and electronics since 2006. Production of robotic wheels is the main field of our company. Today we can supply the demand of many manufacturers, suppliers, students, and participants in the robotic competition for the robot wheels. We are main supplier of ?Omni Directional Wheel". There are highly qualified and committed staffs in the workshop and new facilities can solve lots of production needs.

Multi-directional ability powerful Aluminum body with high friction rubber to move straight, thin body in order to make it able to place easily in all kinds of robots without wasting space, Especially when Robot size is limited.
The assembly consists of a main wheel and traversal rollers.

Some of the advantages of this product are:
? Multi-directional ability
? no need to turn around
? saving time and energy
? able to circle arrangement with only 3 wheels
? 3 cyclic arrangements.

We make sizes between 50mm to 150mm with hole diameter of 4mm or 6mm with 4 Grades.
Our Omni directional wheels can be customized according to the customer order. We can change material or size of the Omni wheels and add bearing to the wheels.
Mechanics and Construction / Re: 1 inch OD Omni-wheel
« Last post by aika2016 on March 01, 2017, 03:48:02 AM »

Look at these Omni wheels: www.gtfrobots.com

good luck
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