 | | list problems
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I'd just like to let everyone know that I'm currently not receiving the mailing list, (who knows why!) so could everyone _please_ mail me copies of any responses you make to my mail? The only other way I have to view them is by checking the mailing (...) (28 years ago, 20-Apr-96, to lugnet.robotics.handyboard)
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| | 2n2907 transistors
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I'm trying to build the h-bridge circuit posted on this list, and, of course, I'm having problems. It simply doesn't work. So, in my efforts to troubleshoot the thing, I'm trying to figure out how each part of the circuit is supposed to work. Which (...) (28 years ago, 20-Apr-96, to lugnet.robotics.handyboard)
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| | Re: high current motors
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This is a repost of a message I sent a few days ago. It bounced back to me, and I don't think it ever made the list... (...) (28 years ago, 19-Apr-96, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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An LM317T is probably what you want. It will provide 1A continous or 1.5A with heat sink. Put a large Cap on the output to take care of peak surge requited by the motors when turned on. These temperary heavy current needs will not hurt the (...) (28 years ago, 19-Apr-96, to lugnet.robotics.handyboard)
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| | Multiple Servo control ??
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Has anyone looked into using the "Mini SSC (Serial Servo Controller)" with Handy Board? Has anyone written any code to allow HB to SSC comunications? I would be very greatful for any info on combining the HB and SSC. Thank you, Larry ***...*** Larry (...) (28 years ago, 19-Apr-96, to lugnet.robotics.handyboard)
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| | IC read timer instruction !
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I want to know if there is a special IC instruction to read the system timer, or just matter of read the whats in the address $100E (high byte) and $100F (low byte). Thanx. Hachemi (28 years ago, 18-Apr-96, to lugnet.robotics.handyboard)
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| | Extension Board
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I want an extension board for the HB. I am planning an arm on my bot. Hopefully with 4 or 5 degrees of freedom so I need more servo ports. Are there any beta units available? What is the progress on the production units? Does anyone have any first (...) (28 years ago, 18-Apr-96, to lugnet.robotics.handyboard)
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| | Re: HC11E1 or HC11A1
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(...) The E1 will work fine. It is officially supported by all of the HB software. See the IC manual for more details. -f (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | HC11E1 or HC11A1
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I was planning on using a HC11E1 on the handyboard instead of the HC11A1, other than twice the internal RAM it looks to be the same part. Is there any reason the E1 part won't work? Mark ===...=== Mark Hastings Phone 206-447-4175 Email: (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Re: problem with PCI PowerMacs?
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(...) Yup. I use my 7200/75 as my only robot development station, and love it. Not a single problem. As11_ic works great, all beat versions of IC work great, even the older version 2 of IC works great. My handyboard couldn't be happier. (except if (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Solar Ni-Cad Charging
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(...) I found a reference to the need to pull the solar cell out of the charging circuit when in darkness - is this necessary? Also, how should I select a diode for this purpose? Sean Cunningham MSI Consulting Group www.msiconsulting.com (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Solar Ni-Cad Charging
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Attach leads to same place the charger goes. + to +, - to -. Don't forget the diode. To be safe, monitor the current when the batteries are fully charged. Should not be more than 50ma. It is a good idea to cycle the nicad's about once a month. That (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | problem with PCI PowerMacs?
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Has anyone tried the IC software (freeware or newtonlabs beta) with a PCI PowerMac? I'm in touch with someone who is having trouble, and I wonder if we can confirm a problem. Thanks, Fred (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Handy Board "To Do List"
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Hi Fred, I noticed the To Do list on the HB page and just wanted to mention a couple of things: 1) The shaft encoders from the IC distribution work without modification. I've been using encoders.icb and encoders.c successfully. I haven't tested (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | new stuff on HB web site
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Greetings HB users, I thought people might want to know about new stuff on the HB web site -- * printed hardcopy docs of the HB assembly pages. much nicer than printing out the web pages. available as a PS file (level II only) or a PDF file. * web (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Solar Ni-Cad Charging
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I would like my robot to carry a solar cell for battery recharging. I have not been able to locate a reference for any gotcha's with this plan, so here goes: I quote from the assembly manual: [start quote] The power supply provides between 12 and 15 (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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| | Sonar Software Better Directions (I hope)
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Location of Sonar Software & Directions. cherupakha.media.mit...nt/hbsonar I hope this is all spelled correctly. Larry Randall (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | Re: TCNT address
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|
(...) It is a 6811 internal register, at addresses $100e (high byte) to $100f (low byte). You should get the Motorola 6811 docs if you are going to be working with this register. Motorola Semiconductor Inc. Motorola Literature Distribution o P.O. (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | Polaroid Sonar Software and Connection Guide
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I've recieved several questions requesting the following info: The software and README connection guide was written by a guy named Kent. I don't have his last name with me. (Sorry Kent). He posted the software and guide instructions on the (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | TCNT address
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Hi everybody, I am windering if the system timer register TCNT is one of the IC global variable or we should declare it, and if so whats the address of this register. My second question is about the HB pins 0 to 15, can anyone tell me where I can (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Battery level monitoring?
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(...) For anyone else interested, I came across a description by Fred of a modification to the Miniboard that describes how to cut a track on the board to allow analog battery level monitoring. Unfortunately, the picture is missing from the page: (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | Sonar sensitivity to 'Curtains'
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I gave my Polaroid Sonar the curtain test and it passed. Someone suggested that Sonar could not see curtains. Not only does it see curtains, it also sees a towel, a handkerchief, a kleenex, and, get this, a piece of free hanging string. My bot is (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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| | RE: h-bridges, current info
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|
The answer is yes, but it isn't as useful. BJTs (Bipolar Junction Transistors) are current based devices, if you look at the 'base' input to the transistor as a pipe, for NPN devices there needs to be current flowing "into" the base for them to turn (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: High current motors
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Jeff is correct, after looking at the schematics for the motor driver my circuit won't work. You will have to wire two sides of the motor driver output to the 2907's with back to back diodes. I'll draw up a schematic and post it. (In my original (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) The IR sensors on the robot I built have an effective range of about 4 feet. The "downside" of IR sensors are that they are much more difficult to scale in terms of distance. I used a PIC chip to do both illumination and error elimination and (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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(...) On the handy board, this is different, isn't it? I didn't think that the center pin was V+... In fact, isn't it not a connection at all? (...) Isn't this supposed to read, "Now connect the COLLECTOR of one 2N2907 to the base of Q1, connect the (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) Don't most IR sensors have a limited useful range, though? I understood that it was difficult to get more than 2-3 inches from an IR sensor - can they be made long-range sensitive? Sean R. Cunningham MSI Consulting Group (URL) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Ultrasound Range-Finding
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(...) For which I have only one comment, "Curtains". Yes, IR can see curtains, ultrasonics cannot. --Chuck (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | New Battery Hack + Charger
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This is in reference to the Motor Voltage Hack on the HandyBoard. In considering the prospect of including the new battery pack in the charge circuit, we should consider the following. 1) The machanics of charging a NiCad is to force a voltage that (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Ultrasound Range-Finding
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|
I have my Polaroid Sonar connected and running. It seems to work perfectly. There is no additional circuitry required. In fact it works so well, I am probably not going to install the IR system, at this time. Larry (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | RE: motor voltages
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The most efficient way to do this is to use a "step down" regulator. These small switching regulators can efficiently lower the voltage while maintaining the current requirements. Maxim sell several chips that do this however you will be limited to (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) I thought I would add for all who haven't read the IC manual, (like me a few weeks back), that it clarifies alot of the capabilities and workings of the handyboard. And that it only takes like one night of bedtime reading so it's kinda short (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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I think what you need is only a simple VR( voltage regulator) It kinda resembles a transitor in appearance). I'm curious to know whether this is all you need. I'm not an EE either so I wonder if you need heat sinks or capacitors or something. ? (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Ultrasound Range-Finding
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I looked arround and this is the cheapestI've found so far. If you go to the various ultrasound specialists, they want an arm and a leg...make that your a torso too. I believe these polaroid things are manufactured in LARGE production conpared to (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Motor Voltage Hack
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(...) Yes, I believe so. I was thinking of that last night but haven't had a chance to look it over. I think you would need to temporarally reconnect the cut with some form of voltage drop,(several diodes in series ?) when the charger is connected. (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Smoothing capacitors on motors?
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(...) 0.1 uF Use ceramic disk capacitors because they can withstand the high voltage of the spikes. -f (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) I'm pretty sure that files assembled this way will work with the freeware IC as well. Please note one big GOTCHA with ICB files. On the MS-DOS platform, the ICB files must have Unix-style line termination. OK, what does that mean. In a text (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) 1. please read the IC manual, which is now localized for the Handy Board. this explains how the ICB system works in detail. look on the HB home page to find the IC manual. 2. yes, you need as11_ic. mac and unix versions are readily available. (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Smoothing capacitors on motors?
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I am using a couple of 6V motors and I have read that it is a good idea to put a capacitor across the terminals of each motor. Although I see references to this practice all over, no one has indicated what ratings this capacitor should have. Does (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Motor Voltage Hack
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(...) [snip] (...) Thanks for this great tip - Can we also tie this second battery pack into the nicad charging system somehow? Sean R. Cunningham MSI Consulting Group (URL) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Assembler
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(...) If you are using the Beta of Interactive C, you can use the web version of the assembler found at: (URL) R. Cunningham MSI Consulting Group (URL) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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| | Assembler
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How do I turn a *.asm into a *.icb? I believe I need a program as11.???. Anyone know where it is? Larry ***...*** Larry Randall ***...*** If it works Don't fix it! ***...*** lrand@cts.com ***...*** (28 years ago, 14-Apr-96, to lugnet.robotics.handyboard)
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| | motor voltages
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Along similar lines, anyone know of a nice way to regulate 9.6V down to 6 or so, at 2 or 3 amps peak? I'm looking for something that's efficient, and won't try to burn itself out during normal use. Possibly something like the LM317 is available in (...) (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | 6V motors off of 9.6V (again)
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Yes, once again, I'm exploring the idea of running some 6V motors off of the handy board's 9.6V battery. Basically, I'm worried that if I do this, I'm going to burn out _another_ pair of motors. (Though the last couple were 3V, these are 6...) How (...) (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Extention Board?
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I heard that there is an extention board for the HandyBoard. Does anyone know if it is available yet, and where I can get one? Price also? Thanks Larry ***...*** Larry Randall ***...*** If it works Don't fix it! ***...*** lrand@cts.com ***...*** (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Motor Voltage Hack
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Want to use motors of different voltage than the 9V required by HandyBoard? Then read this. I had decided to use converted Servo's as wheel drives, and they want about 4.8V. In studing the diagram and board layout I discovered that the HB batterys (...) (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Battery level monitoring?
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|
Has anyone figured out how to monitor the battery level on an HB1.2? I would like to be able to use a circuit similar to the one published in the Jones Mobile Robots book, but it connects output directly to an analog port and is confused by the (...) (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Re: h-bridges, current info
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|
(...) the fuse is rated for about 2.5A continuous. If that is not enough, get one rated for more current, or replace it with a wire and make sure not to short out the nicads, or you'll get 30 to 40 A flowing. -F (28 years ago, 13-Apr-96, to lugnet.robotics.handyboard)
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| | Ultrasound Range-Finding
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|
I would like to add range-finding of some description to my robot project. I would prefer to make it as cheap as possible. I have heard of the various polaroid-based schemes, but these all sound as though they are $90+ solutions. Does it have to be (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | h-bridges, current info
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|
I'm trying to figure out a couple things. First, can four NPN transistors be used to form an h-bridge? I was looking in a book, the Robot Builder's Bonanza, which features a circuit which uses four TIP41 transistors. However, don't most h-bridges (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Servo
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you have to load both servo.c and servo.icb. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text dictation system. Please forgive any sloppiness in the formatting. Thanks. -Fred In your (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Servo
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|
(...) You need to do a 'load servo.icb' before you do the 'load servo.c' command. The .icb file contains the code described in the servo.asm file, in a binary format. The code in the servo.asm file does the actual work of running the servo output. (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | Servo
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Does anyone know how to activate the servo on HandyBoard with IC? (I am going to use the Polaroid Sonar Ranger when it gets here.) When I try to load 'Servo.C', the supplied program, I get 6 or 8 errors of unassigned lables. I assume that (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | re:4 line LCDs and other LCD questions
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|
(...) HB experts, correct me if I'm wrong, but if someone wanted to use an LCD bigger than 2x16, wouldn't the pcode have to be recompiled? I know that in the pcode.asm file there is reference to displays up to 2x80 (of which I have 4 and none work (...) (28 years ago, 12-Apr-96, to lugnet.robotics.handyboard)
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| | 4 line LCDs and other LCD questions
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Dear HB suppliers: Can anybody sell us bigger LCDs for the HandyBoard? I need at least 4 line LCD or other similar type. It will be used in complete darkness, so it should be illuminated. Thanks. Alexander A. Chaihorsky President, ULTRA-RES Corp. (...) (28 years ago, 11-Apr-96, to lugnet.robotics.handyboard)
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| | RE:TCNT reg
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|
(...) The battery goes to the (+) (-) spots, and the charger plugs into either the Handy Board itself (near the frob knob) or on the serial/battery board. The system time, while running IC (which is what I assume you're going to do) is in (...) (28 years ago, 11-Apr-96, to lugnet.robotics.handyboard)
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| | TCNT register !
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I want to know if the time we get from timer (TCNT) is in second or milisecond. I was trying to run the handyboard for my first time, and I am confusing about the power supply, I don't know if the power supply should be plugged in the handy board (...) (28 years ago, 11-Apr-96, to lugnet.robotics.handyboard)
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| | Nuggets
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While trying to unload some IS1U60 IR receivers, I found the sharp data site. It turns out that the IS1U60 has a center freq of 38 khz, while 40khz is is well within its pickup range, I wonder if changeing the circuit on the HB to 38khz would (...) (28 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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| | ???
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Would anyone think of selling me an ASSEMBLED and used Handy Board for cheap. I have very limited funds and would appreciate any price reduction. Thank you. You can E-mail back on the mailing list or to Babylon007@aol.com. (28 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Emitting 40khz IR
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poke(0x1000,0x40); will turn the IR on at 40KHZ and poke(0x1000,0x0); will turn it off. (...) Dr. M. K. Ramasubramanian Assistant Professor Department of Mechanical and Aerospace Engineering North Carolina State University Box 7910 Raleigh, NC (...) (28 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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| | fuse on handyboard
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I'm curious - what is the maximum current the Polyswitch fuse on the handyboard will allow to pass through it? I'm designing an H-bridge circuit to allow me to drive a heftier base with the handyboard, and I'm trying to figure out if I can still (...) (28 years ago, 10-Apr-96, to lugnet.robotics.handyboard)
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| | Polaroid Sonar Bulk Buy
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|
Hello Everyone, As you may or may not know I am hosting a Bulk Buy for the Polaroid 6500 Sonar Ranging Modules and matching Transducers. The deadline for orders to be in by regular mail is coming up quick, Friday, April 19, 1996. If you are (...) (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Sonar
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The Robotics Practitioner is a magazine about robotics targeted more for students and hobbyists than many of the professional Journals. Their email address is: trp@footfalls.com. Other two email addresses in the previous messge are the articlel's (...) (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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Yeah! This would help alot! Who is trp@footfalls.com? Is this person someone who posted the article once in handyboard mailing list? (...) (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Emitting 40khz IR
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How do I send out 40khz IR on the handyboard IR port so that I can use a Sharp IR detector for proximity sensing? I would need a signal that wasn't modulated at 100 or 125 hz, right? Just a straight 40khz signal. Any help would be appreciated. -John (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | RE: Sonar
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The Robotics Practitioner (trp@footfalls.com has part 1 of an article about this in the Fall, 1995 edition by Bavid Musliner (musliner@src.honeywell.com) and Rick Moll (rick@footfalls.com). Part one is concepts; part 2 will present detailed design. (...) (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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|
Speaking of Polaroid ultrasonic sensors, does anyone know if there's a product out there that can multiplex a few of the sensors? Thanks. (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Sonar
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(617)386-3965 OEM Components Group 3 kits: $299, $165, $99 You're probably interested in th $99 one wich has 2 Rangers and 2 Transducers. (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Sonar
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I don't have my Handy Board yet, but I do need some help in locating a Sonar Ranging Module. I have looked everywhere I can think of to no avail. Even emailed Polaroid and asked them. Twice. Still have no response from them. Where do I get a (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | HB design
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|
I got my handyboard on Saturday, and followed the assembly instructions that Fred did, and was thoughoughly impressed. Fred, you did great work, and have really done a great service to all of us. Thanks. (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | more address lines on expansion board
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|
Hi Brian, When Fred and I designed the Rev 2.0 6.270 controller, we consciously made the expansion bus small and simple. For most expansion devices, the pre-decoded chip selects make more sense than sending all the address lines, since the latter (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Pcode instructions?
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OK. I know this is going to be a long shot, but here goes: Are there any docs on the pcode? I.e. is there some way that I can learn what I need to learn to modify the source code pcode.asm besides reading the file pcode.asm and tearing my hair out? (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Handyboard expansion status
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(...) I don't have one of the beta versions of the expansion board, but I've been building my own expansion boards and putting them on the HB. One thing that I've found is problematic with the HB design, in regards to expansion board design, is that (...) (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | http://lcs.www.media.mit.edu/groups/el/projects/handy-board/maillist.htm
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i would like to use the list. thankyou, Jeff (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | mseconds
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Is there a way to get sub-milisecond times measured with the handyboard? I was thinking of trying to modify msecond but I can't look at it now that it is a primitive. Dirk (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | Expansion board
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How many Polaroid range sensors can the expansion board have up to. One? What kind of signal does it produce? (28 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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|
I think the question on how to run higher current motors has got to be the most asked question here. Maybe we should add more info to the FAQ or something. Anyway, here is Chuck McManis' solution from a while back. I hate to send out something that (...) (29 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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|
How about this one? ...to enable two directional rotation. ___...___ motor ___...___ | | | | -> / / -> |/ |/ |/ |/ ---| ---| ---| ---| | |\ | |\ | |\ | |\ | \ | -> | -> | \ | | | | | | | | | | | | | | | | | vcc | gnd | gnd | vcc | | | | | | | | | | (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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Do you have to choose a transistor that will switch somewhere near and below 9 volts? Cause Fred mentioned that the handyboard is rated for 9V motors. But, does this mean that the pulse generator make 9V square waves? (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | RE:
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It would work but it would be uni-directional. --Chuck ---...--- From: MAR ERICSON[SMTP:mar@cooper.edu] Sent: Wednesday, April 03, 1996 11:27 AM To: handyboard@media.mit.edu Does anyone know if you can do this to the L293D chip to increase the (...) (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | Question !
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What should be the nominal voltage of the DC-Motors for the handyboard, I know that in miniboard its 6v - 36v. Thanx. Hachemi. (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | (no subject)
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Does anyone know if you can do this to the L293D chip to increase the current? _____- motor +________ / | L293D |/ | motor output___...___| + |\ \->- baterry | | - | | | | ---...--- The transistor in the center would be a high current one. Would (...) (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | expansion interface
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How is the beta-test of the expansion interface progressing? Anybody care to estimate when the design might be finalized so I could purchase one? How much would a kit be expected to cost? \---...---\ \ John Mathews jkm@po.cwru.edu \ \---...---\ (29 years ago, 2-Apr-96, to lugnet.robotics.handyboard)
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| | 26 VDC motor
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Using the handyboard, can we drive a DC-motor which has a nominal voltage of 26 volt, (the starting current is less than 600mA). Thanx. Hachemi. (29 years ago, 2-Apr-96, to lugnet.robotics.handyboard)
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| | Re: hooking up to R/C car
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(...) A really wild/money is almost no object idea would be to get electronic speed controls from radio controlled cars. These things can control up to several tens of amps continuously. You can control them like controlling a servo. Their cost is (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | Re: hooking up to R/C car
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(...) There aren't any control electronics to this thing at all, really. There's four switches on the control box, some wires going to the vehicle, and four motor/gearbox combos in the machine that the wires supply power to. No drivers, no heat (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | hooking up to R/C car
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(...) We've had success interfacing digital signals directly to the drive circuitry that's already present on some R/C vehicles. The problem you're running into is that R/C motors just draw too much current for 293's. (If you look at the controller (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | *WARM* L293D's on Handyboard
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Today I ran out to Toys 'R' Us and bought a wired-remote controlled excavator to serve as the base for my HandyBoard. It seems to be causing me a little problem, though. Before I removed it from the controller that contained the battery (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | New version of Mac IC: 3.1 beta 5
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A new beta version of Interactive C for the Macintosh, Mac IC 3.1b5 is now online at: (URL) and improvements from beta 4: * Printing is now enabled * Definition files and board recognition are better handled * Files, functions, and globals info (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA
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Note that the spec sheet for the L293D states that the package can only dissipate 5 watts. With a voltage drop of 1.3 volts that is 3.85 amps total through all drivers. However, since that is the absolute maximum rating your probably looking more (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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| | Re: PA7
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(...) no,this is wrong. The servo output is J2 - 9, not J2 - 15. (...) you need a 5 volt source to power the servo. The Handy Board 5 volt supply can be used, but this will put a lot of stress on the system regulator. It would be better to get a (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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| | PA7
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Another Q or 2 about using the servo capabilities of the handy board. It has been established that the servo motor output is actually digital output 9 (J2-9) (position numbered 15 (on the silk screen) of connector J2) 1) Is there a separate (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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| | Re: two servo code
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(...) Actually, none of the default functions in pcode_hb.s19 actually use the IR transmit line -- you have to load in someone's ir transmit icb file. so that line is completely up for grabs. mike, it shouldn't be too ahrd to work from Randy's (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA
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Thanks. This helps clarify things about the motor features alot. I was looking into transistors for the first time. I was wondering if you can connect the L293D output to the base of a high current transistor. ...and the collector and emmiter in (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: two servo code
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(...) Fly-in-the-ointment: I'd still rather disable the IR Xmit function than the buzzer. My application would like to use the buzzer to communicate audibe condition codes. I appreciate Randy's effort to sacrifice the piezo buzzer so we can supply (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | two servo code
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(...) Hey Randy, it would be cool if you could modify that code to use TOC3, which is free and available on the expansion bus, rather than disabling the piezo. Maybe somebody else wants to do this. -Fred (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | digital output
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Hi, I am wondering if there is any means of digital output other than the motor ports such as the miniboard has. The miniboard has the bank of digital i/o ports. The handyboard has the digital input but I am not sure about digital output other than (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 1050mA Dc Motor
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With teh TI chips, you might get away with it, just do not stall the motor for long. It will not work with the L293Ds, they are rated at 600 ma ( they might work for awhile) (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | pcode, libraries for two servos
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For people interested in using the piezo output line for a second servo, I've put libraries and new pcode's online at (URL) under "IC-related packages"). The new pcodes disable the beeper code in IC, and free up the line for other uses. The library (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) from the L293D ground? yes, this would be correct. Well, there would be 2.4 amps running through the chip's power source, into the motors, and into ground. ...totaling 4.8 A runniing throught the entire chip fro m a power dissipation (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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