 | | Connected Radioshack truck
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like Ram, I connected successfully a radio shack RC truck (4WS) to the handy board. for the DC motor controlling forward and backward speed, I found the 2 entries of the h bridge connecting the motor. I replaced the cheap front end steering servo (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Re: Using cheap RC chasis as 'bot
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OK, time for me to chime in on this thread... The biggest problem, IMHO, with using a cheap RC car/van/truck as a 'bot base is that they all use Ackerman steering (two non-steerable driven wheels in the back, two linked, steerable, non-driven wheels (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Re: Using cheap RC chasis as 'bot
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(...) The biggest problem with tank like drives is the marks/scratches on the floor. Any robot with any weight will probably damage a maple or other hardwood floor in short order. They work fin in a lab with waxed tile floors that no one cares (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Re: Using cheap RC chasis as 'bot
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(...) This would be great! I've always known that my mechanical skills were nowhere near as good as my electronic/programming skills, and getting a suitable base set up is a formidable problem for me. Something like what you propose would be the (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Re: Connected Radioshack truck
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(...) (snip) (...) I also have one of the Radio Shack RC trucks. A good solution for shaft encoding would be to glue a couple (or 4) magnets to the inside rim of the rear tires. Then glue a hall effect sensor to the axle. When the wheel spins, the (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | RE: Connected Radioshack truck
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(...) You know what makes REALLY good REALLY cheap shaft encoders? Mice! Get an old mouse that has a broken button (that's usually what goes on mice) and pull it appart. Sometimes, depending upon the kind of mouse, you can get really luckey, and be (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | battery voltages
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Regarding the use of a 6V ni-cad pack to solve my over-voltage problem in driving small motors, could I still use my current 9.6V pack, but simply insert a tap into the battery at somewhere close to 6V? Seems nicer than buying another battery pack, (...) (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Re: battery voltages
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(...) Yes, and the current capacity would be the same, since excess voltage gets dissipated in the HB's voltage regulator. -Fred (29 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
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| | Robot Chassis
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Given the extensive traffic concerning robot platforms, I thought I'd add my two cents: For my senior project at Cal Poly I made a robot that had three wheels, two of which were independently driven and one which was a small caster. The chassis and (...) (29 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
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| | Re: battery voltages
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(...) I'd use 6V instead of the 9.6V main power supply - connect it where the main battery terminals are. It'd be really nice if the handy board had a way to use voltages other than 9.6V for the motor driver chips, ya know. :-) (29 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
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| | Using cheap RC chasis as 'bot
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I used a Fischer Price RC car: well built with two gear settings and quite battery efficient. Once the RC receiver was ripped out, there was plenty of space for the Miniboard to be mounted internally. However, I chose to mount it on top in a (...) (29 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
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| | Caster Substitute
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While there is some discussion on robot bases, let me add a bit about the "third wheel", usually a caster, used on differential drive systems. Casters have the advantage that they are plentiful, cheap, and come in lots of sizes and configurations. (...) (29 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
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| | announcing the HB Expansion Board version 2.0!!
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Greetings all, The Handy Board Expansion Board version 2.0 design is complete! I'm pretty excited about the feature set, which includes a bunch of things not on the older (not released) expansion boards: * high-impedance analog inputs * PIC (...) (29 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
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| | 5mm range reflectance sensor
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Hello, I've got a 5mm range reflectance sensor which I am trying to get to work with the handyboard, without much success. Here is what I have: DigiKey part #: OR506-ND Manufacturer #: EE-SB5V The labels on the leads are as follows: .--- (+) .--, / (...) (29 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
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| | Re: 5mm range reflectance sensor
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(...) Very nice ASCII graphics. I don't know this part but assuming that the + and L pins are the pins which control the transmitter, and asuming the reciever is a photo transistor that should act as a switch, I would say that you should connect the (...) (29 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
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| | IC Problems
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OK all of you IC gurus. How come I can't do this: int m() { int *address; address=&a0; address++; } a0 is a variable defined in an .icb file. I also can't do something like address=address+2; or address[4]=7; Why not? This is all pretty standard C (...) (29 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
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| | IC Problems
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OK, OK. RTFM, I know. I looked at the on-line manual, and now realize that IC arrays are different than normal C arrays, and so you can't do stuff like int m() { int *address; address=&a0; address++; } But then the question still remains, how can I (...) (29 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
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| | IC Problems
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(...) Brian> But then the question still remains, how can I define a list of Brian> consecutive memory locations in a .icb file and then access Brian> them from within a loop in a .c file? [ ... ] Brian> Anybody run into this before or have any (...) (29 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
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| | Quad encoders
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Thx to the advice of many of you I am using encoders from mice as shaft encoders. The code in the libraries does not seem to take into account encoders with TTL signal in quadrature. Therefore I do not get direction from the current software. Maybe (...) (29 years ago, 11-Feb-96, to lugnet.robotics.handyboard)
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| | battery voltages
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I'm currently trying to get 6V out of my 9.6V battery pack. (I actually looked around for a 6V one, but couldn't find one that would work...) I've opened up the pack, and can access the cell where I can get 6V. However, I'm not sure how to get a (...) (29 years ago, 11-Feb-96, to lugnet.robotics.handyboard)
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