 | | Quad encoders
|
|
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 (...) (30 years ago, 11-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | IC Problems
|
|
(...) 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 (...) (30 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | IC Problems
|
|
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 (...) (30 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | IC Problems
|
|
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 (...) (30 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: 5mm range reflectance sensor
|
|
(...) 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 (...) (30 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | 5mm range reflectance sensor
|
|
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: .--- (+) .--, / (...) (30 years ago, 8-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | announcing the HB Expansion Board version 2.0!!
|
|
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 (...) (30 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Caster Substitute
|
|
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. (...) (30 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Using cheap RC chasis as 'bot
|
|
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 (...) (30 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: battery voltages
|
|
(...) 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. :-) (30 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Robot Chassis
|
|
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 (...) (30 years ago, 7-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: battery voltages
|
|
(...) Yes, and the current capacity would be the same, since excess voltage gets dissipated in the HB's voltage regulator. -Fred (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | battery voltages
|
|
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, (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | RE: Connected Radioshack truck
|
|
(...) 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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Connected Radioshack truck
|
|
(...) (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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Using cheap RC chasis as 'bot
|
|
(...) 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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Using cheap RC chasis as 'bot
|
|
(...) 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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Using cheap RC chasis as 'bot
|
|
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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Connected Radioshack truck
|
|
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 (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Using cheap RC chasis as 'bot
|
|
Hello All, Concerning the thread of RC chasis with the handyboard, I've done that (albeit with the 6.270 board) and found that it was not that tough. I was fortunate to find a decent RC van setup for only $20. It was some time past Xmas of last year (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: battery voltages
|
|
Where on the Handy Board would you plug the 6V into? and what is the J13 connector for? -John (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: hmph
|
|
why not use the cars drive electronics, just bypass the radio part, it would take a little work to find the points where the motors are turned on, but it should work. Just watch out for other people with remote control units. (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Enable interrupts within IC?
|
|
Hi all, I'm trying to use IC to poke in an interrupt routine (the IC3 interrupt from pin PA0) assembled using PCBUG11 at $B600. I can set all the register bits correctly, but I can't execute the CLI (general interrupt enable) HC11 opcode from within (...) (30 years ago, 6-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | driving 3v motors
|
|
(...) The best solution here is to replace the HB's 9.6v batt with a 6v one. Once you get past the L293's, you'll be giving around 4v to the motors, which should be fine. -F (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Some quest. for details
|
|
(snip) (...) You will tend to get a lot of flickering if you do not place a sleep() command in your loop that writes to the screen because the screen is being redrawn too quickly. Tom ___...___ Tom Cicatelli cica@tiac.net Melrose, Massachusetts (...) (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Some quest. for details
|
|
Hi there, last week I've got my HB up and running and it works very fine. I've been playing around with it IC and some questions came up. I hope they are not too boring: - I don't know exactly in which manner sleep() works. It looks like being a mix (...) (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: resistors w/motors?
|
|
At 1:43 PM 2/4/96, Jeffrey Keyzer wrote:>> (...) How about using some power zener diodes to drop the voltage: |----[-power diode+]----[+zener diode-]------| L293D ----| |------| | |----[+power diode-]----[-zener diode+]------| | | [motor] | | (...) (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | 3V motors w/handy board
|
|
Perhaps it would be best if first I could find a solution to this problem - What's the best way to drive 3V motors with the handy board? If I can solve this, I can really broaden my horizons as to the types of things I can use with the handy board. (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: hmph
|
|
(...) Be careful. Cheap RC cars tend to use 3v motors that want to draw a fair bit of current. Expensive RC cars use motors in a better voltage range for the HB (.e.g, 8.4 or 9.6v), but they draw serious current (5 to 10A easy). -F (30 years ago, 5-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: resistors w/motors?
|
|
(...) The problem with that solution is that the motors are driven bidirectionally - a regulator wouldn't work when the polarity it was given was reversed. (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | resistors w/motors?
|
|
I'm curious - can I limit the voltage to a motor by putting a resistor in series with it? What are the pros and cons of this solution? I have a bunch of low voltage (3V) motors that I'd like to be able to use with the handy board, but giving them (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: hmph
|
|
(...) That's a definite possibility. However, I'm looking more for something that has a tread-type drive system, though two independently driven wheels is fine. That allows me to simplify steering the robot, so that I can rotate it at a point. (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: hmph
|
|
(...) How about buying a $15 RC car from radio shack and adding a $15 servo to do the front steering? I haven't tried it. I'm using RC-10 cars and they're GREAT. Independent suspension, hispeed, good traction... but several hundred dollars. -- (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Re: HB died - HELP
|
|
Keith, You may have shorted something out while connecting up the battery. I've seen this before, and parts do fry if you connect them to 9.6v. If while you had the battery ground lead connected, you just brushed the +v lead onto some pins, that (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | HB died - HELP
|
|
HELP . . . My HB has stopped going into bootstrap mode. Hope someone out there can help!!! The HB had been working fine. I was having fun with IC, and I finally got around to the Fuse and Battery final assembly (Part 6 of the assembly instructions). (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | hmph
|
|
Ironic that, just as I write a message looking for L293 drivers, the motors I was driving with them should fail. Unfortunately, it seems that I overpowered the small DC motors I was using, and burned the brushes to bits. :-( So perhaps I should (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | L293 chips
|
|
I'm still searching for a pair of L293B chips. (Though I guess that Ds would work as well...) In the meantime, I'm overloading my L293Ds, which become extremely hot during operation. (Wonder how much life I'm taking off of them... I need to find a (...) (30 years ago, 4-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | HB list now being archived
|
|
Greetings HB users, I have enabled archiving of our list. The archive is at: (URL) is linked from the mailing list page off of the main page. BTW, some people have asked if they can receive the list's mail in digest form. The answer is "sorry, no." (...) (30 years ago, 2-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | IR transmitter for the Handy Board
|
|
I am going to beta test an IR tranmitter unit for the HB, I have 10 of these spoken for, but can supply more. Unit has 9 IR leds, is less than 1 inch square, takes from 60 to 150 ma., user selectible. The unit is designed to be driven by the HB, but (...) (30 years ago, 2-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | Need for parts
|
|
It is now time to think about reording more parts, or just bailing out all together. Please tell me if you will need any parts in 3 or 4 months and what the amounts may be, you are committing yourself. I just need to gauge if it is worth having (...) (30 years ago, 2-Feb-96, to lugnet.robotics.handyboard)
|
| |
| | sony-ir question
|
|
Hi HB'ers I have been using the sony-ir.asm program written by Brian Silverman to send commands to my mobile HB. However, I noticed that if I use printf commands the ir routine returns un-reliable results. My program uses the subsumption approach (...) (30 years ago, 5-Jan-96, to lugnet.robotics.handyboard)
|
| |
| | SPI header
|
|
I can control the output on the SPI header (in accordance with the instructions from the FAQ), but I can't figure out how to get the timing right to send a 2400 or 9600 baud signal. Can anyone help me? Is there any code out there that can do this (...) (30 years ago, 27-Oct-95, to lugnet.robotics.handyboard)
|
| |
| | mailing list
|
|
Please add me to the handy board mailing list. If there is no answer at this address please try 94049017@opc.saultc.on.ca thanks ted houle (30 years ago, 9-Sep-95, to lugnet.robotics.handyboard)
|
| |
| | Problems with my DC-Motors
|
|
Hi , i have a problem with my handyboard, but i can´t explain it in english (because it´s a little bit to difficult for me :) do you understand german ?! Folgendes Problem habe ich mit meinem HandyBoard: Ich benutze zwei DC-Motoren und habe sie am (...) (31 years ago, 9-Mar-95, to lugnet.robotics.handyboard)
|
