 | | 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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| | Re: Hardware Problems
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(...) All I can add is that is what mine does, and it seemed to break when I hooked up a 'normal' 12V battery charger, which is opposite polarity to the HB charger requirements. According to the diodes in the diagram, this shouldn't be a problem, (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) This one's pretty easy. Two IR detector/emitter pairs along the bottom, midline of the robot (say, about 1cm or less off the floor). The algorithm is to keep both detectors over the black tape (i.e. a low reflectance reading); if the right one (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) He have (had?) some robots here at work that were used in the production areas, and they followed a line on the floor. I've not studied them carefully, but I think they work something like this: Two reflective photosensors are aimed at the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Hardware Problems
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Hello, I'm having trouble getting my Rev 1.2 Handy Board up and running. It did work once and then the following symptoms: I start the mac based down loader, which download the bootstrap code fine. Both charger board and the handy board's serial (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | store variables in RAM after reset
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Hi guys, I'm new to the interactive C. Does anyone know how to declare an array of variables which can be changed by the program and stored in the RAM and their values stay the same even after reset? Second, I'm aware of something called the (...) (27 years ago, 15-Apr-97, to lugnet.robotics.handyboard)
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