 | | Collision Advoidance Emitter Circuit
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Hi All, Had anyone actually built the Infared LED emitter circuit that is on the Rug Warrior? (i.e. pg 108 of Chapter 5 of the book "Mobile Robots" by Jones and Flynn). I've looked at it and I can't for the life of me figure out how it works. Before (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Good books about electronics
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(...) Mike, I would also recommend the book: "Electronics (A Self-teaching guide)" by Harry Kybett (1986 by John Willey & Sons) ISBN 0-471-00916-4. It is a very excellent beginning text. It teaches concepts and then you self test yourself every 2-3 (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| | Re: GPS
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(...) Yep. Me! There weren't any major headaches involved in doing it. Feel free to ask me questions. I may have to get my source from home in order to answer them though. Curt Mills, WE7U Senior Methods Engineer/System Administrator (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| | Re[2]: motors
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Thanks. I tries that. I even tried to use four of them in parralel. OK, here's what I've discovered...just to let you all in on it and maybe it'll help someone in the future. I pulled the leads from the motor header and powered the motors directly (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| | Handyboard to Vector 2X compass
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I'm planning to hook a Vector 2X digital compass to my HandBoard. I'm looking for any code for such and interface. It should be simple SPI stuff but I've never messed with the SPI before and would rather not re-invent the wheel. I've checked the web (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motors
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Mar, You might want to try attaching a small (0.1uF) capacitor to the motor leads as close as possible to the motor. Use a ceramic or monolithic ceramic capacitor. That might reduce the motor noise your sonar board sees. Also remember that even (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| | GPS
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Hi, I want to connect a gps-receiver which provides NMEA-0183 data to the HB. Did anyone connect a gps to the HB before? Carsten (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| | Using Step-Motors
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A couple people have expressed interest in how to use step-motors with their handyboards. I have used step-motors with my miniboard, and since both the handyboard and the miniboard use two L293D chips to run the motors, I am fairly confident that (...) (27 years ago, 20-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motors
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I haven't had the same poblems, but I have a theory as to your problem. There are two probabilities: 1) The motor is causing too much noise and is interfering with the sonar, or 2)The motor is giving off electrical noise (i.e. electromagnetic waves) (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| | motors
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Hi, I have some motor trouble. I have two motors. I have a polaroid sonar. When I run one of the motors, the sonar works. When I run the other motor, the sonar's detected distance jumps arround randomly. The randomness seems to be more at higher (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| | hbsonar
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I am trying to run 4 sonar sensors from the HB, and I'm not sure how to go about doing this. I have a copy of the code from the ftp://cherupakha.med...ntrib/kent directory, but I'm pretty bad with assemby language and I'm not sure what I would need (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| | Stepper motors driver circuit and .s19 compiler...
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Hi, I heard from fred that there is someone out there who had used stepper motors with the handyboard, I am doing something which need to use stepper motors. Therefore I need your help in this area, please email me how should I go about design the (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| | Stepper motors driver circuit and .s19 compiler...
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Hi, I heard from fred that there is someone out there who had used stepper motors with the handyboard, I am doing something which need to use stepper motors. Therefore I need your help in this area, please email me how should I go about design the (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Stepper motors driver circuit and .s19 compiler...
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Good Day All, I also would like more info on this. If not too much trouble, could it be posted to the whole board as well? Take care... (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Good books about electronics
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The ISBN is: 0-521-37095-7 I took the class at harvard that the book was written for. It was a good class. I learned a lot. I'm not so good with the analog stuff though... There is a student manual which is pretty helpful too. It's by Hayes and (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor driver chip....
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SGS-Thomson makes the L293D and L293E: www.st.com/stonline/...s/1330.htm You can also build a custom H-bridge motor driver using the MAXIM 620&621 MOSFET drivers. Search for Maxim in a search engine. jm (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor driver chip....
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(...) Depending on the manufacturer, you might be able to get the specs online, usually in the form of PDF files that are the datasheets for the chip. I know national semiconductor does this, and it's very fast and easy...otherwise, you have to try (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Good books about electronics
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By far the best book for all kinds of electronics is "the art of electronics" by Horowitz and Hill. There is not a lot of "what is electricity" (try a good encyclopedia). This book begins with basic network theory and goes from there through just (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor driver chip....
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see the hb suppliers page for dealers who sell the l293d. (URL) your message you said: (...) n. (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Good books about electronics
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Hi! I'm very new in this business. So I thought where could I get a good tutorial book about electronic components and the way they work. And most important - what is electricity and how it works. Can anyone advise me? mike (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | motor driver chip....
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hola, I was planning on using the L293D motor chips in a project that I'm working on. I'm going to use polaroid motors to drive a vehicle. I was wondering: -Does anyone know how I could get specs for this chip? -Are there other motor chips that (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | When will the expansion board come out?
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Hi, does anyone know when the expansion board will be available? Thanks, Duncan (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | battery life and charging
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Did someone already try to program the handy board the way to enable it testing the battery´s status and - if necessary - driving to a "docking station" and reloading the battery? (Self-feeding-automatism) Someone an idea how to solve this problem (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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Chuck, Chuck, Chuck...not EVERYONE in engineering and robotics is male. I, myself, am quite definitely *not*, nor ever will be, male. Engineering is a co-ed field, and women have made their mark upon it. While there are few of us compared to the (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | line following
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I have had great success with black tape on many different light colored backgrounds but I wasn't using discrete components for the sensors and emitters. Instead, I used Omron EE-SY313 amplified infrared photosensors, and plugged them right into the (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | battery life
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(1) the memory should last about a month if the board is turned off, as several have noted. (2) please be aware that the serial interface will *DRAIN POWER FROM THE HB* if the interface itself is not plugged into power. thus do not expect anywhere (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Small gear suppliers?
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Try. Stock Drive and Sterling. (516) 328-3300 ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | gears
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Hello all, There is a company called Small Parts Inc. located in Miami Lakes, FL. They have been a good source for me in the past for all kinds of random stuff. I don't know if they have the specific parts you need, but they are a good shot, and at (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Small gear suppliers?
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We need some small gears for a gear train for a small DC motor. Does anyone know of likely vendors? I want decent quality gears, not plastic! Thanks. ***...*** * Greg Starr, Professor and Graduate Advisor * * Department of Mechanical Engineering ph (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) The experience is good, I'm just not sure you took away the right lesson from it. :-) Everything Katt say's is true, when you are following lines detecting the line is sometimes not as straight forward as the description would have you (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) As have I, so when I wanted to build a line-follower, I used a couple of IR detectors in concert with a pair of IR emitting diodes. They were arranged on the nose of the robot as follows: 1 2 3 4 \ | | / Where 1&4 are the IR emitters and 2&3 (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | variables
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Can you access variables declared in a binary progam from a different binay program? i.e. can "speeda" (pcode.asm) be accessed by xxxxxx.asm? Do you have to know the actual address where "speeda" is stored or can you just use "speeda" inside (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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To avoid that battery problem, I have mine plugged in about 20 hrs/day and the other 4 hrs the serial interface is plugged in. I've had problems in the past where I've presented a robot that couldn't work because the batteries died & there were no (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) <snip> (...) <snip> In my rather limited experience with reflective photosensors, I've found that black on white is not always the best of choices -- the white can come up as different numbers depending on how clean/dirty the floor is and the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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The best answer would be to take the mAH of the battery, say X=1500 mAH. Find out the current drawn by the RAM say I=5mA. Divide X by I and you get the number of hours of battery life. This is ofcourse assuming that you have a fully charged battery (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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rabbit> 3600 since there are that many seconds in an hour. I myself rabbit> have left the handyboard off for periods of 4weeks or more rabbit> and still have had my memory. I just rattled the above off rabbit> the top of my head so, anyone, please (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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Ive got a pretty crappy answer for you but its the best I can offer; check out how much current the RAM draws from a data sheet and calculate the power it uses (P = IV, where I=RAM current, and V=5v). Divide the mWHr your battery delivers by the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) I did something like this in an early computer engineering course. The requirements are exactly the same ie. follow a black line. What Chris said is a good start but you should also consider the case when the turn is too sharp; In this case (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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Same question here. I left mine turned off for one night and the next day the battery had almost completely run down! jm (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Battery life
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I think I already posted this question some time ago but never got an answer. Is it normal to have the HB run out of battery even when is not being used ?? I know the battery is always working to keep the RAM from erasing, but I'm wondering how long (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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