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Mechanics and Construction / Re: CS student help needed in motor selection
« Last post by bdeuell on May 04, 2016, 07:57:33 PM »
here is a forum discussion that covers calculating motor torque in some depth

Misc / Re: FUNNY - The Pickup Artist
« Last post by johnnywheels on May 04, 2016, 04:44:40 PM »
It's almost as funny as the Car-Drive thru prank.

Lmao, even the most basic puns are hilarious coming from a robot :D
Electronics / Using P-Channel MOSFETs as a switch
« Last post by jjsylvestre on May 03, 2016, 07:18:27 PM »

I have a question in regards to using P-channel MOSFETs as a switch to power a relay coil. I am trying to implement this sequential circuit below.  When this circuit is first turned on,  'fault' is 1 (indicating everything is good) and current will flow up until the second MOSFET. When you press the set/reset button, the relay latches on and will stay latched until the fault is 0.  Once fault returns to 1 0, the relay won't be powered  until you press the reset button again.

My question is... will a P-Channel MOSFET work as the switching device here or should I use something else like a solid state signal relay? I have only used MOSFETs when the source is at a constant voltage so I'm not sure if it will affect the MOSFETs behavior if the source is changing.

Note: The indicator light circuitry is also whats in the schematic. That shouldn't affect the circuitry of concern.

Mechanics and Construction / Re: CS student help needed in motor selection
« Last post by munim on May 03, 2016, 01:27:30 PM »
there is some information in the tutorials section regarding calculating motor torque. search the posts and web as well.

a couple notes:
- what units is your speed in?
- you will probably need a gearbox (or some other speed reduction)
- what acceleration do you need?
- what surface is it driving over?
- does it need to go up any incline if so how steep?
- how much will the robot weigh (i'm assuming the weight provided is for the payload)?
speed is in km/hrs.
surface is ceramics/home tiles/wood floor.
i think i will be able to control acceleration with my aurdino.
not using robot for inclined surfaces yet.
total weight will be 10 kg of robot and the payload
Thanks for replying appreciate ur concern.
Misc / Re: FUNNY - The Pickup Artist
« Last post by cyberneticdreams on May 01, 2016, 10:49:48 PM »
I just watched this video! I watched the drive-thru one too; Meccanoid must have given those drive-thru employees' quite an odd and fun experience. It's so cool to see robots bring smiles to people's faces.

Both videos are so cute and funny! ;D  Thank you for sharing the link, MeccaNoid Madness. I gotta watch more of these videos...
Misc / Hello everyone at Society of Robots!
« Last post by cyberneticdreams on May 01, 2016, 10:03:44 PM »
Hi, I'm Sara! But in the forums you'll know me as cyberneticdreams. As a robot enthusiast it is about time that I joined an online forum specifically for those with similar interests. As for forum discussions I'd probably gravitate to topics on robots in pop-culture/entertainment or on robot ethics. I guess I'm more interested in the sociological and ethical situations robots could be put or found in, whether in the real world or in literature, TV and film. 

I'm not building robots now, but I'm learning some robotics terminology and history, just to understand robotics better.

I chose my username after a blog I write. Cybernetic Dreams is my online robot diary about my thoughts, feelings, and experiences about what I read or watch about robots, androids and cyborgs. Once in a while I update it on what's happening in my life.

But enough about me for now...

To break the ice, I'd like to know: What's your favorite robot in entertainment or the real world? Or your favorite robot movie?
Electronics / Re: DTMF 8870 Circuit Explanation
« Last post by mklrobo on May 01, 2016, 12:21:43 PM »
Cool! A lot of things can be done with the chip! I have made my own way of communicating with it,
using the tones to send weighted binary data. I converted the ANSI standard character code to
4 tones, in which can be understood in pure audio(by humans), or transmitted by other means.
I based this method on Morse Code; In which I call this new method Morse Tone. (Now we know
how the robots using tones in Star Wars communicated to People! joking.. but possible. :) )
Electronics / Re: DTMF 8870 Circuit Explanation
« Last post by robotprince on April 29, 2016, 05:47:50 AM »

After reading this forum, I got some interesting info about 8870. But I came to know that when we press a button in the mobile phone, it splits into two frequencies (i.e. high and low frequency) which will produce a single tone. This tone is sent to 8870 IC through headphone jack and they are separated by bandpass filter. Then they are decoded using digital counting techniques to receive the digital output.

Nothing much, just wanted to share my knowledge.

Source: http://blog.jayroboticsclub.in/how-ic-cm8870-works-as-dtmf-receiver/
Misc / Re: My buddy Tim's HUGE robots
« Last post by gtabasso on April 27, 2016, 05:34:32 AM »
He builds them in six months but works on them 24/7. I wrote a blog post about him. He builds mechanized monster trucks, too. You can read the blog here if you are interested in learning more:
Misc / Re: My buddy Tim's HUGE robots
« Last post by johnnywheels on April 26, 2016, 06:39:34 PM »
These are two of my buddy Tim Willis' robots. He's working on a 50-foot fire-breathing dragon right now. This is what he does fulltime! Build robots. He's bringing them out to my office on Thursday for an event we are having so he can show them off to the high school's Robotics Team. He actually lives IN his garage, sleeps a couple hours and works around the clock. He drove to Florida and back in a day to get parts for the dragon. My friends are amazing makers.

They certainly are!  This is incredible!!! Hope to see more pics as the dragon evolves, thanks for the share, will definitely be checking in!  Do you know how long he usually works on the project from start to completion?
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