 | | Re: phone cord length
|
|
Hi Jeremy, I have used a cable as long as 25 feet to connect between the handyboard and the PC. It seems to work alright for me, but the technician at school warned me that wasn't a good idea because TTL runs across the cable, and that's a bit too (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Re[2]: IR Collision avoidance
|
|
Richard, I've tried the op-amp method and had some success. I just don't know how I would power the -5V via the HB. Do you have any suggestions? Thanks. (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re[2]: IR Collision avoidance
|
|
Bill, Why is everyone using a digital device to try to detect the (analogue) distance to an object? Especially one with AGC, it makes no sense! I modulated the IR at 10KHz (high enough to be away from mains light flicker, but out of the way of the (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Collision avoidance
|
|
Well, at risk of being branded a heretic, since you've brought up the issue of modulated IR, I'm going to throw out an observation I've made about the Radio Shack IR sensors which several other people on the mailing list have privately disagreed (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | phone cord length
|
|
Hi, I was wondering how long a piece of cable you can put between the handboard and the serial interface and still have it work. If anyone has any experience with this please email me... thanks, -Jeremy ___...___ Jeremy Green jag@world.std.com (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Collision avoidance
|
|
(...) I have a few questions for you. How did you combine the 38khz and 500hz signal. In a design that I am working on now I have two signals similar to yours and an enable signal running into a three input AND gate. I haven't built it yet but it (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | motors
|
|
Hi, Yes, that schematic posted by Prabal was exactly what I meant. I sent you the bmp anyway, Adam. David (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: motor voltages
|
|
Adam, I think David meant something like this: |---|<|---|<|---|<|---| M+ ----x x----(motor)---- |---|>|---|>|---|>|---| | | M- ---...--- That way you have a voltage drop AND conduction in both directions. - Prabal (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | where to get a board.
|
|
hello. i'm new to this mailing list, and would like to purchase a handy board. i'm curious if there i a place where i could perhaps find a used one (in working order), or who the best (read: cheapest) distributor is. thanks for info you can provide. (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Servos and Handyboard.
|
|
you can't power 2 servos from the hb's own +5v supply. get a separate 5v supply (linear regulated, *noT* a switching supply, OR batteries) and run your servo power from that. connect this external supply ground to the HB motor ground (on J13). -Fred (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: motor voltages
|
|
David, I would be interested in seeing a schematic on the wiring of the diode array. I am not sure of how it goes - exactly. I'm not located near a dedicated fax. I was wondering if it might not be too much trouble to sketch the schemtic on some (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Servos and Handyboard.
|
|
Hi Everyone. I'm doing a project on controlling servos using the handy board (actually, I'm building a camera rig with servo controls and interfacing this tho the www) My problem is this: when i try to control both servos at the same time, using the (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | as11 assembler
|
|
Hi, This may be a dumb question, but I hope someone will oblige me anyway. I was checking out the handyboard website, and I wasn't able to find a PC version of the as11 assembler. Does anyone know where I can get a copy? Thanks, Maria ---...--- (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: D0 - D7
|
|
Mar, This is what I've learned about the handyboard so far, and hopefully it will give you a little insight into what's going on with D0-D7 (the external bus). Because of the way the handyboard is configured, it's operating in special test mode. In (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: More Motor Speeds
|
|
go to the software resources page, and then follow the link named "Interactive C for the Handy Board source code and information". -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR collision avoidance
|
|
Riachard, Could you please explain to me how the IR emitter angled at 45 degrees is able to pick up its beem. I'm unsure of the IR emmission dynamics. Wouldn't an IR angled perpidicular to the wall being travelled along suffice as the only sensor? (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: sonar,radar
|
|
Do this: ftp://cherupakha.med...trib/kent/ Then open the readme file. It will tell you the connections. :) ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu Department of Mechanical Engineering The Cooper (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | D0 - D7
|
|
I was poking about the HB with an osciloscope and ran into a bit of confusion. I had the motor outputs ON and wanted to see the PWM effect. I was able to see the square waves but...when I poked "behind" the octal latch to see what's going on with (...) (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | hello everyone
|
|
After many frustrations and down times, I've decided to move from students to cslab. Please send me e-mail at brojd_b@cslab.uwlax.edu and NOT at brojd_b@students.uwlax.edu Thanks Benny (28 years ago, 2-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: More Motor Speeds
|
|
Where is this file: pcode.asm. I can't seem to find it. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Fun part
|
|
Cappy, (...) I believe that the quickest, most efficient way to get a handle on C is to obtain and begin reading a book called "The C Programming Language" by Brian Kernighan and Dennis Ritchie, ISBN 0-13-110362-8. This small book describes the (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Fun part
|
|
I just sucessfully finished putting together the handyboard and will say that if one takes their time and is careful-there shoould be no problems. One observation/question. I notice that with the battery installed, the "heartbeat" character on the (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Reducing Battery Pack Voltage
|
|
Hi Fred I am attemping to run two low voltage DC motors (as motors 0 and 1), around 3V each(I don't have specs). I have piggybacked two of the motor driver chips (and maybe adding a third) to handle the higher current but they are still getting (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Reducing Battery Pack Voltage
|
|
I think I might have wrote something wrong before. I said that you can use an external battery of 3V. I take it back. Sorry... I didn't realise that it would only work for 6 volts to 36 volts. Ooops. :b ericson mar Master of Engineering Candidate (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Reducing Battery Pack Voltage
|
|
U can use an external battery with the HB. It can be 3V. Check the FAQ in the HB HP. The exact link is: (URL) mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu Department of Mechanical Engineering The Cooper Union for the (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Reducing Battery Pack Voltage
|
|
as has been discussed on this list, the Handy Board wasn't really designed for three volt toy motors. Reducing the voltage and doubling the motor chips is a reasonable approach, however. The Handy Board requires 7.2 volts to operate, because of the (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | motor voltages
|
|
Hi, This is in response to the question about motor voltages posted earlier tonight. Check out the archives. Late last week I posted a similar question and got some good responses about wiring the HB for two power supplies and using diodes. I have (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Collision avoidance
|
|
Hmmm. What voltage and/or LEDs are you using? Assuming 5V, your LEDs age passing only around half a milliamp of current. I am using a 100ma LED and I can only get less than a foot of detection. Am I missing something here? Jun Nolasco (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Collision avoidance
|
|
(...) Those are the IR LED's - the one's that transmit the IR light that the receiver sees. Also, while I'm at it, I found out that the diagram above isn't completely accurate (I drew it from memory). The circuit I really use is like this: (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Collision avoidance
|
|
(...) What are the three LED's for? (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Re: use of single power source op amp circuits with the Handy Board
|
|
(...) The text of your question suggests many possible answers, but I would like to propose a couple of exploratory questions. More importantly it would be useful to have some global state as to what it was you were trying to do. Anyway, you can't (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Printed circuit board
|
|
Hi, I like to know if there is a posibility to buy a printed circuit board for a Handy Board in Holland, and if there is where can I get it ? Thanks Emiel Agema (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | help.......analog expansion header
|
|
How do you use the expansion header on analog inputs 0 to 3? I could not find specifics on its use in the documentations. Thanks, Nathan Marcantel nathanm@mail.utexas.edu 512-272-8024 6517 Carisbrooke Lane Austin, TX 78754 (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | help ....use of op amp circuits with the Handy Board
|
|
Does anyone know how to get a negative 5 volts from the Handy board for an op amp amplifier circuit or set equations to figure out the gain of an standard op amp as the 741 or LM339 using Vee as ground and Vcc as +5 VDC? The equations only seem to (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | use of single power source op amp circuits with the Handy Board
|
|
Does anyone know how to get a negative 5 volts from the Handy board for an op amp amplifier circuit or set equations to figure out the gain of an standard op amp as the 741 or LM339 using Vee as ground and Vcc as +5 VDC? The equations only seem to (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | LCD display
|
|
Hi, Is there any way to disable the LCD display? Rather the heartbeat. I'm not using the LCD, and I don't want anything printing the the LCD, heartbeat included. Thanks, Maria ---...--- Maria Pirsic IEEE Branch Treasurer 96/97 Carleton University (...) (28 years ago, 28-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Re: timing
|
|
(...) Mike, Not enough info to determine your problem. Are you using the Output Compare functions, or are you trying to emulate that functionality some way? The OC lines are hardware-set, so they go off whenever the free-running counter matches some (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | timing
|
|
Hi- I'm attempting to write an assembly routine to control a pulse width, but I can't seem to get the timing down. For example, I can output a 3.33ms pulse width, but if I run the routine again, it sometimes jumps to 3.5ms, and then jumps back down (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR collision avoidance
|
|
(...) Good question! We had a lot of noise problems and learning curve stumbles along the way. Our first bad news was that we had a range of a few inches. We finally beat that one fooling with frequencies, caps, etc. and then found out our range was (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR collision avoidance
|
|
(...) ** My only question is how do you keep the bot at a constant 18 inches ** away from the wall with a collision detection algorithm? Is it ** possible to get analog outputs from a sensor indicating the ** distance from a wall? Or is there is (...) (28 years ago, 27-Feb-97, to lugnet.robotics.handyboard)
|
