Robotics : 4672


Robotics / 4672

Re: Tow Truck & pneumatics —Joel Shafer

(...) Cool, let us know if you get it. It would be interesting to know what nifty parts it has. I had a tough time deciding between the front end loader and the tow truck. Both appeared to have the pneumatics and extra parts that I wanted to use (...) (26 years ago, 22-Apr-99, to lugnet.robotics)

Re: Tow Truck & pneumatics —Stephan B. Wessels

(...) A solution that I have used, although not what you asked for, is to purchase the extra motor kit (pretty inexpensive) and use that motor and the dedicated power box to make a stand alone compressor station. Heck, if the extra weight is an (...) (26 years ago, 22-Apr-99, to lugnet.robotics)

Re: Tow Truck & pneumatics —Dennis Clark

(...) This was my quandry and my solution as well. (...) nice. I built up a standalone compressor using the idea that someone on lugnet came up with. He (and I) used the S@H polarity switch and a small pneumatic cylinder calibrated with a rubber (...) (26 years ago, 22-Apr-99, to lugnet.robotics)

pneumatic switch control —Joel Shafer

(...) I've been thinking about this a lot... What about using a differential to separate motor direction output. Turning one direction could control one switch and turning the other could control the other switch. The switches could be controlled in (...) (26 years ago, 22-Apr-99, to lugnet.robotics)

Re: pneumatic switch control —Dennis Clark

(...) Rather than that, how about triggering one switch automatically at the end of travel of the other? For instance, you won't dump your bucket on the front end loader until it is a max height. Have the motor control the lift are with a sensor (...) (26 years ago, 22-Apr-99, to lugnet.robotics)

Re: pneumatic switch control —S. Crawshaw

(...) To connect the motor to the switch, use a piston arrangement (like a car engine). This can be done quite compactly. A single touch/light sensor and medium pulley wheel can be used to count motor revolutions (to determine when you've gone from (...) (26 years ago, 23-Apr-99, to lugnet.robotics)

Re: pneumatic switch control —Eric Brok

Dennis Clark wrote in message ... (...) dropped (...) See demonstartion of the principle: (URL) pneumatic control from menu Eric Brok Visit LEGO ON MY MIND: (URL) Control section: (URL) section: (URL) (26 years ago, 26-Apr-99, to lugnet.robotics)

Re: pneumatic switch control —Geoffrey Alan Long

I just got my RIS as well as some pneumatic parts yesterday. The timing couldn't be worse as I'm in the middle of finals and can't spare much time for non-studying activities. However, your suggestion inspired me to take a study break and open up my (...) (26 years ago, 23-Apr-99, to lugnet.robotics)

Pics of 1999 Mindstorms items —S. Crawshaw

The press room at www.legomindstorms.com has some new pictures of the two new kits due out this year. From these pictures, it's clear that the "Scout" unit - in the Robotics Discovery Kit - is very similar to the RCX; it has only 2 inputs, and (...) (26 years ago, 24-Apr-99, to lugnet.robotics)

Reading sensors at equal intervals. —S. Crawshaw

Is it possible (with the standard firmware) to read the RCX sensors (actually, ideally, to run any old subroutine) at equal intervals, ie like every 100ms or something? (I assume it must be, otherwise you couldn't measure speed with the angle (...) (26 years ago, 24-Apr-99, to lugnet.robotics)

Re: Reading sensors at equal intervals. —Kekoa Proudfoot

(...) By standard firmware, I assume you mean using the byte codes ala NQC or something similar. If you only want semi-precise timing, you can use the wait opcode to delay for approximately 100 ms between sensor samples. If you want something more (...) (26 years ago, 25-Apr-99, to lugnet.robotics)

Re: Reading sensors at equal intervals. —Dennis Clark

(...) I though that the four "Timer()" values read out in 100ms increments only. Is there a way to get a 1ms timer with NQC? thanks, DLC (26 years ago, 25-Apr-99, to lugnet.robotics)

Re: Reading sensors at equal intervals. —Kekoa Proudfoot

(...) You are right, the timer values as seen by the firmware are in 1/10ths of a second. I lost myself in H8-land, which has a 1 ms timer that gets divided down before being seen by the firmware. -Kekoa (26 years ago, 25-Apr-99, to lugnet.robotics)

Re: Reading sensors at equal intervals. —S. Crawshaw

(...) <snip> (...) That looks like a "no" then... How does the timing of tasks work? I seem to recall reading somewhere that the firmware executes the tasks in sequence - is there any timing element to this, or does it just do task 1, then (...) (26 years ago, 26-Apr-99, to lugnet.robotics)

Re: Reading sensors at equal intervals. —Kekoa Proudfoot

(...) IIRC, it preferentially executes a single instruction received from the IR connection, otherwise takes the next instruction from the next task and executes that instead. (...) Probably. I don't think LegOS supports (what I'd call) a software (...) (26 years ago, 26-Apr-99, to lugnet.robotics)

Re: Pics of 1999 Mindstorms items —Eric Brok

S. Crawshaw wrote in message ... (...) I offered an explanation for that in a previous post. May want to look it up. Eric Brok (26 years ago, 26-Apr-99, to lugnet.robotics)

Re: pneumatic switch control —Joel Shafer

At 05:13 AM 4/23/99 -0400, you wrote: <snip> (...) Awesome. It was easy to think of, but I'm not sure that I could have built it as well as you. I particularly like the cam mechanism that you developed, and the use of just one touch sensor. Very (...) (26 years ago, 23-Apr-99, to lugnet.robotics)