Recent Posts

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31
Misc / zero moment point
« Last post by ketanco on May 16, 2017, 10:02:51 AM »
Hello,
Can someone explain what is zero moment point?
I checked google but all i read confuses me
32
Hey Macdad, exactly the same situation here with the MB7092; silicone works in air, but no dice underwater.  I know it has been a while, but have you overcome this challenge?  How did you do it?  I think there is a lot of people interested in underwater ranging who would benefit.

[update 5/16/17]

MB7092 contains active filtering and will show last position if it cannot get 3 consecutive readings within 1 cm.  I think it may be tossing out the requested readings.  Ordered an MB7060 compact and will let everyone know how that works.

[update 5/18/17]
MB7067 (compact version with no horn) works with my test water column. 
33
Electronics / T-Shirt Robot Communication Question
« Last post by Colbyk1 on May 10, 2017, 04:35:35 PM »
Hey Everyone,
My name is Colby and my FRC team is working on building aT-Shirt cannon (We understand that PVC isn't rated for pressure) and we want to control it with something like an RC car/ airplane remote as the controller because we want to have a long range, So I guess my question is does anyone know of a way to have the signals from an RC remote be interpreted by a computer? We would like to do this because this would allow us to still fully program the robot, I know I could possible look for a motor controller that outputs PWM and I'm not totally aginst that but we would still like to be able to program our robot!
I don't know if this is the place to post this but I don't really have any other ideas!!
If anyone can help at all it would mean the world to me and my FRC team 353!!
Thanks in advance,
Colby Kusinitz
34
Electronics / Bomb Disposal Robot Secrets
« Last post by EMCosta on May 07, 2017, 09:07:32 PM »
Hello everyone.
I was watching an episode of Conan where he visits the explosion ordnance disposal division. When Conan asks to a soldier what is the barrel on the bomb disposal robot for the man answers purposely in a vague way, telling nothing about it's usage. So i decided to ask you guys.

My guesses are that it's used for some kind of radiation measurement like a geiger counter, a EMP gun to disable electronic bombs or even a simple air gun to get rid of dust.
35
Electronics / hall effect sensors
« Last post by ketanco on May 05, 2017, 03:32:07 AM »
what is the difference between a hall effect sensor and a magnetometer?
how are each used in hobby robotics, i mean what are the example uses?
36
For Sale / Selling Apple IPhone 7 ,IPhone 7 plus 6S and Samsung Galaxy S8 Plus
« Last post by Jonas222 on May 04, 2017, 04:18:42 AM »
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37
Mechanics and Construction / pneumatic flipper-please help
« Last post by 4rfvedc on May 03, 2017, 01:01:20 AM »
I build a 12pound battlebots,use pneumatic flipper(110psi),but the cylinder moves to slow,the thrust is enough,but the speed is not enough to flip other robot.
What the best cylinder and Solenoid valve to use for the flipper?
Should i use the decompression cylinder?


thanks :)
38
Mechanics and Construction / Re: Animatronic Robot
« Last post by pip4566 on May 02, 2017, 02:39:55 AM »
Hi I found out how to do it.  I have now build a small animatronic parrot that turns it's head from left to right. :)
39
Misc / Looking for Quality High School Robotics Experiences
« Last post by curt_bixel on May 01, 2017, 11:02:10 AM »
It seems that there are a lot of exceptionally high quality high school robotics programs out there.  The things the best programs seem to have in common are"

1.   The kids are exceptionally invested in what they are doing, and they are passionate about it.
2.   The kids work in multi aged groups, with students returning year after year, passing their knowledge on to younger students.
3.   The work is project based.
4.   There are a lot of actual real problems the kids are working on, so there is a lot of problem solving.
5.   Lots of engineering and science is being learned.
6.   The activities the kids are involved in day to day are in service to a larger project and goal. 
7.   What the kids are learning depends upon the project and goal.
8.   There is nothing about it that seems contrived.

I have also noticed that often these types of experiences, which we all know are truly excellent education, happen outside of the actual school day. 
I am wondering if anyone knows of a school that has solved this problem and offers such a robotics experience during the actual school day. 
After looking around a bit, it seems that most of what goes on during the day is structured to the point that it does not permit a lot of the items listed above.  It seem especially hard to find a system where students can return and mix with other newer robotics students. 
I would love to hear about some places where such a program might be thriving!
40
This video will show you a quick way to find out if two 32 pitch gears will mesh together when using them on Actobotics channel.
https://www.servocity.com/motion-components/rotary-motion/gears
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