Posts Tagged ‘vex’

Dipping with the Dobot Magician

Pick and place and moving things around are staples of industrial robots.  Another reason to use robots in industry and automation is because of danger to humans. Robots can work in environments that are adverse to humans; especially toxic and/or adverse environments.

Sometimes the best way to pick up an object is with a suction cup or vacuum gripper.  This works especially well with very small objects as well as large, and provides a cheaper alternative to a mechanical gripper.

In this activity, you will perform a chemical dipping operation with a robot arm using the air pump kit and a vacuum gripper.
  • Go home
  • Pick up the cylinder from the pallet
  • Dip it in Tank 1 for 2 seconds
  • Move the object and dip it in Tank 2 for 2 seconds
  • Move the object and dip it in Tank 3 for 2 seconds
  • Move the part back to the pallet.
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How do I make my Dobot Magician talk to a VEX Cortex?

Question:

How do I make my Dobot Magician talk to a VEX Cortex?

Answer:

It’s called handshaking and it is probably one of the more difficult tasks when working with robots and machines. We use an optical isolator so as not to damage any of the equipment with incompatible voltages, so be sure to see the website for the wiring diagrams. Watch this four minute video to see how it’s done!

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How do I use a switch as an input for the Dobot Magician?

Question:

How do I use a switch as an input for the Dobot Magician?

Answer:

CAUTION: NEVER PLUG IN OR UNPLUG WIRES FROM THE DOBOT WHILE IT IS POWERED ON! Always turn off the dobot first, and use the input output manual to plug into the correct port!

 Wire it like this:

Wire the VEX switch using a servo extension cable. Always wire black to black. Use pins GP5.2 and GP5.4 as shown in the diagram above.

Then in the software, trigger it like this:

  1. Be sure that you are in “Pro” mode by selecting it in the top middle of the Teaching and Playback mode.
  2. Set IO_5 to be equal to one on the right side of the screen.
  3. In this example above, the robot will go to it’s “Home” position and wait to be triggered by the switch in Line two.
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VEX Encoder Doesn’t Work!

Question:

I can’t seem to get my encoder to work no matter what I do!  It will only ever return a value of 0 or 1, and only for a moment. What’s up?

Answer:

Well, did you restart your software and hardware? Then check this out!  I’ll bet you have another analog sensor plugged into your cortex, like the sonar…. Found this after searching the web…. If using another analog sensor, the Quad Encoder MUST be plugged into a higher number port. Really? Yup. See the snip below. Spent at least a day on this then found the documentation on line, switched the ports with the sonar sensor so that the encoder was on 8 & 9, and the sonar on 4 & 5, and viola! Success!  Try it! Also… we NEVER got the error as shown below… It just didn’t work. Download the whole VEX pdf here: Quadrature+Encoders

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