 | | BrickFest Bulletin: Mindstorms/Technic Contests and Events, Space Contests, Castle Contest and..
|
|
(URL) Mindstorms/Technic Events BrickFest 2006 is fast approaching! This year, the Technic and Mindstorms Theme coordinators are pleased to announce 5 competitions. The competitions will be spread across the 3 days of BrickFest. The planned (...) (19 years ago, 20-May-06, to lugnet.events.brickfest, lugnet.events, lugnet.robotics, lugnet.robotics.events, lugnet.space, lugnet.castle, lugnet.general, lugnet.announce, lugnet.build.contests, FTX) !!
|
| |
| | Re: Ultrasonic sensor interactions
|
|
Hi Tim, (...) it should be possible to use the ultrasonic sensor itself for that, there is a command to listen in on other sensors for that purpose. Jürgen (19 years ago, 20-May-06, to lugnet.robotics)
|
| |
| | Re: Ultrasonic sensor interactions
|
|
(...) How feasible would it be to set up some sort of time-sharing communications over Bluetooth to allocate time slots when each of the robots in an area would be allowed to use their ultrasonic sensors? -Tim (19 years ago, 20-May-06, to lugnet.robotics)
|
| |
| | Re: Ultrasonic sensor interactions
|
|
(...) In a word, multiple ultrasonic sensors can be a problem. This is a general problem and not specific to Lego ultrasonic sensors. Pulses emitted by "the other sensor" can arrive at just the wrong moment, creating a false range reading. Clever (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) But (critically) not ALL of the stuff! (...) What I suggested was that your rechargable batteries are at the end of their lifespan. Buy a set of regular NON-RECHARGEABLE batteries and see if everything works OK then. If it does then toss out (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus? - battery output and RCX performance
|
|
(...) I think that NiMH should be up to the task at that power level (difference between NiMH and NiCd occur at much higher discharge rate). But maybe there is one or more dead cell that cant't hold its charge? Since NiMH provide 7.2V instead of 9V, (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus? - battery output and RCX performance
|
|
(...) The Lego geared motors can pull about 250 mA when stalled, and close to that when heavily loaded. So for three motors, that may be more current than your batteries can deliver. Rechargeable batteries, esp NiMH, don't deliver the same peak (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Ultrasonic sensor interactions
|
|
Can someone from the MDP comment on how multiple robots using the ultrasonic sensor interact. It is possible to use this sensor reliably when one or more other robots nearby are using theirs? -Tim (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
ok, I finally got to trying some of the stuff you recommended. I recharged the batteries and tried downloading the firmware. It can run the whole program without the motors being plugged in. It can even run the program with all motors plugged in but (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: Thoughts
|
|
Hi Andrew, (...) there are actually 3 I/O lines on each sensor port: - 1 legacy sensor A/D with appropriate power supply on the same line. - 2 digital I/O lines, one of which can also be configured as analog in. The remaining lines are 2 GND pins (...) (19 years ago, 19-May-06, to lugnet.robotics)
|
| |
| | Re: Thoughts
|
|
(...) That's correct. In fact, the only completely digital sensor in the NXT set is the ultrasonic sensor. -- David Schilling (19 years ago, 18-May-06, to lugnet.robotics)
|
| |
| | Thoughts
|
|
While sitting in an incredibly boring IB Spanish I class this afternoon (no teacher=no work=no progress=boredom=idle thoughts), I had an idea. It may have been said already in the flood of NXT-based messages which crossed my inbox several months (...) (19 years ago, 18-May-06, to lugnet.robotics)
|
| |
| | Re: Lego Research- Please Help!
|
|
Glad to help... I have an interest, also, in how to use these types of products to create interest in the math/science subjects. There is so much information on the Internet and from organizations like FIRST/FLL... good luck. Jim -- View this (...) (19 years ago, 18-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) The original firmware is a very stable piece of software. The only moment that we ever had serious problems with it was linked to our robot GASTON while being used in the same room with a 10 desktop Mindstorms robotics course. Some parasite IR (...) (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) I use rechargeable batteries too but I use Rayovac Renewals, Manganese Alkaline which have a full-charge open-circuit voltage of 1.55 and a fairly linear discharge curve (sloping downward, of course). I don't use NiMH rechargeables because (...) (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
Hello Jonathan, (...) No, it is extremely improbable! Here is the only "virus" for RCX I know: (URL) it requires some cooperation so that it can spread! (...) I don't think so. Did you have very heavy load on all three motor outputs? if so, there is (...) (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) Some more info about the problem: My RCX is 2.0 and I bought it 4-5 years ago. It's been on the shelf for a while (2-3 months) and I've always used rechargeable batteries. The ones I'm using now are 2000mA NiMH. I installed the firmware both (...) (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) I seem to remember that as well, but it was in either Java or Ultimate Robolab IMS. What language/firmware are you using? (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | Re: RCX Virus?
|
|
(...) I think it is very doubtful. I have not heard of any actual evidence of an RCX virus. What software are you using? How old is the RCX? Are you using a Ver. 1.0 with A/C input? Are you using an external power transformer? Can you borrow another (...) (19 years ago, 16-May-06, to lugnet.robotics)
|
| |
| | RCX Virus?
|
|
I think I heard about something like this a while back. I recently built a "CNC Milling Machine" out of Lego. It's my first attempt so it's very rudimentary and doesn't look that nice. Once I made a small program to see how the machine worked, I (...) (19 years ago, 15-May-06, to lugnet.robotics)
|
