 | | Re: Lego motors
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(...) As I've said, I think the new Lego Technic gear motors are a great deal. They're inexpensive (about $18 each), they seem to be quite efficient, and they run well directly from the HB power supply. If you're building your robot out of Legos (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | LCD Removal
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I was just wondering if there's any way to disable and remove the LCD screen and still have the HB work. My design does not require the LCD, so if i could remove it my robot would then be a little more balanced. Every time I remove the LCD my (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: lego robot servomotor
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(...) What you have is most likely a 9V DC motor, not a servo. As far as I know, there is no such thing as a Lego servo motor. The four-contact plug is a Lego standard that allows changing the polarity simply by rotating the plug 90 degrees. There (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | lego robot servomotor
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i have a motor that is manufactured by lego, and has a 4 pin connector which is in the shape of a lego block. i am new to lego robots, so i do not know what the various parts look like exactly. the motor that i have is about 1.25" cube, and seems to (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Lego motors
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This subject has most probably been discussed numerous times but I'm kinda new to this mailing list and the Handyboard so bare with me. What are the pros and cons of using Lego motors to drive a robot project that I have in mind ???, should I scrape (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: DC VS SERVO
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That still does not tell me the difference between how they are diven. For instance, can you use the 4 motor ports to drive a servo motor? If not why? Any help appreciated. Chris Rhodes (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: Radio Shack Tape Measure
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There were two enthusiasts who did hacks on the Radio Shack Tape Measure, Jonathan, back in February of 1994. Their names are Thomas Rowley and Brian Van Mondfrans. Brian was at Thurston High School in the Puget Sound area back then so you might (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Optosensors
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I've had pretty good luck getting up to around 2" by using a standard IR LED and standard IR phototransistor, modulating the IR LED in software, and looking at the analog value returned from the phototransistor like so: { int refl; led_on(); refl += (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Radio Shack Tape Measure
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Can anyone point me to an article on connecting the Radio Shack Tape Measure to the MIT 6.2 controller board. Also, has anyone used this device with either the miniboard or the handyboard. thank you ___...___ ___...___ Jonathan Swaby 305 Sparks Bldg (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Optosensors
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1/2" is actually pretty good range for a basic reflectance sensor. try using them in the analog inputs -- you should get readings that let you read out to about 1". to get better than that, you need a modulated signal, like Pandit has described. (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Optosensors
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Hi Brian, I believe you are trying to implement the proximity sensor for object avoidance or collision avoidance, correct ? I believe the QT1114 is designed for the range the you have found. The spec. of the part also indicate the very near range (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Problems with Smoot-PWM
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Hi all, i have problems during download the new smooth-pwm routine into my handyboard. All times my downloader stopped after few seconds with an error message "EOF after 1xxx Bytes ....." I´m using a macintosh (PPC 4400) and use the 6811 download (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Infrared Optosensors
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I interfaced 3 infrared optosensors to the digital inputs on the handyboard. I'm a little dissapointed in their performance however. The only time they give a reading of "true" is if they are about a half an inch or closer from the target. Any (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | Re: DC VS SERVO
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Chris, See pages 20 and 21(pdf pages 25 and 26) of the handyboard technical (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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| | DC VS SERVO
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HELLO, MY NAME IS CHRIS RHODES AND I AM CONFUSED ABOUT THE DIFFERENCE BETWEEN A SERVO MOTOR AND A DC MOTOR. THE HANDYBOARD LITERATURE SAYS THERE ARE THE 4 DC MOTOR OUTPUTS AND 1 DIGITAL INPUT THAT CAN USED AS A SERVO OUTPUT. WHAT IS THE DIFFERENCE (...) (26 years ago, 4-Jun-98, to lugnet.robotics.handyboard)
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| | Robotic Lawnmower List/DGPS
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Can someone give me the info on the robot lawnmower mailing list? As I recall they split off with their own list a while back, but I didn't follow to the new list. There are some developments in Differential GPS that they should probably be made (...) (26 years ago, 4-Jun-98, to lugnet.robotics.handyboard)
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| | A/D converter
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From: Hector Noriega, 3JUNE98 Thanks Adam,(adam@programmer.net) The Speed of the A/D inproved by about 50 HZ, by getting rid of float types, so now I can sample data at 290HZ only!. According to the Motorola "Pink Book" the A/D should be ready after (...) (26 years ago, 4-Jun-98, to lugnet.robotics.handyboard)
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| | Re: One Handy Board available for sale.
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I stand corrected. From: brian-c@technologist.com Date sent: Thu, 2 Jul 1998 23:49:02 -0400 (EDT) To: "Mike Davis" <ipscone@halcyon.com> Subject: Re: One Handy Board available for sale. (...) -- ---...--- ipscone@halcyon.com Shoot-To-Win! Protect (...) (26 years ago, 4-Jun-98, to lugnet.robotics.handyboard)
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| | Re: One Handy Board available for sale.
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Isn't that more than the board is brand new, assembled and tested? They are available for $180. Correct me if I am wrong. Is the IC perhaps 3.x? From: PWebb@swri.edu Date sent: Thu, 2 Jul 98 11:36:10 CDT To: <handyboard@media.mit.edu> Send reply to: (...) (26 years ago, 3-Jun-98, to lugnet.robotics.handyboard)
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| | Re: download problems
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The motor state is insignificant before the board has booted. I.e., the fact the motors are on the red direction means nothing; it's just the random state of the motor output latch when the board turns on without a program. The LCD screen should not (...) (26 years ago, 3-Jun-98, to lugnet.robotics.handyboard)
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