 | | Re: Stepper vs DC
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It depends. if you are looking for higher top speed and more torque using less power, DC may be the way to go. If you want accuracy but don't want to deal with shaft encoders and the code overhead needed to precisely control and monitor your DC (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | stepper motors from 5 1/4 drives
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Okay, another newbie question: What do I need to take out of the 5 1/4 drive, other than the motor to get this to work? Also, what about drivers for the same? Anyplace I can get more info on this? I have a bunch of old drives laying around. thanks (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Stepper vs DC
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(...) Actually, steppers do have some advantages. 1) If you do not have encoders on DC gearhead motors (or wheels, etc) they are notoriously hard to position accurately. Steppers can be controlled very accurately. Most servo motors cannot rotate (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Do It Yourself RF module????
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Bastiaan: I wanted to suggest that you investigate the Ham Radio community. Some search words to help get you started include PACKET and ARRL. The first is one of the digital communications protocalls used in Ham Radio, and the second is an (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re. RF data link
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If the data tx/rx modules can't handle TTL levels is there any reason to have the interface board at the PC end ?, why not replace the serial cable going to the PC with the rx/tx modules ?. Surely this should work. John (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: DC Motor movement
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(...) Each motor may have slightly different characteristics even though they may be the same brand and model. This is what you are probably seeing. The ultimate solution is to use a feedback mechanism, like a shaft encoder, on the motors and use (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Newbie Questions, Problems & Contributions...
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(...) I've heard the difference is that the buttons, the knob and the sensor ports won't work as expected. Try moving pcode_hb.s19 to the directory that contains the dl executable, or to the present working directory, or to the directory specified (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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have you tried re-loading pcode_hb.s19 using a downloader program. fred In your message you said: (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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Hello this is mike, I am writing regarding the handy board. What happened was while working on the handy board, our motor control (the H-bridge) heat sink touch the metal chassis of our robot. This lead to one of the components on our H-bridge to (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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hello, i use the handyboard for closed loop position control. the handyboard is good for such a task provided that you choose a motor well suited for the task, and an accurate feedback element, such as a (very) linear pot or optical encoder. as for (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | RE: persistent var's in IC
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I had a similar problem using the freeware IC and I found that things like the position in the code at which the persistent array was initialised made a difference. Eg put the initialisation of the array right at the beginning of your code, this (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Question for Fred
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Hi Fred I have question for you. I have to control a position using the miniborad or the handyboard. And I don't know which motors is good the DC servo motor or the stepper motor and whats the diffrence? Another question if you don't mind, have you (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | DC Motor movement
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hi, The following command will cause the DC motor to rotote one after other according to the std lib and the command. hence, the robot will gradually slanted. It cannot travelled in a straight. motor (2, 100); motor (3,100); My question : how to (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Newbie Questions, Problems & Contributions...
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Hi, I have few newbie questions, and a contribution to make... Background info: ---...--- I have been playing with my HB for a week now, using the free IC 2.850 under NTServer4.0... So far, Ive been sucessfully able to control DC motors, send (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Where i can buy?
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I try to buy the flash ram type NM29A040 or TC58A040. Or another type of serial ram eeprom for my HB. But i don't know where i can find,buy it. Does anyone know who sell on-line, this IC's. Thank Fede. E-mail: fedsante@tin.it (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Question for Fred
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That's a funny question. I just finished a class on this exact topic. The basic determining factors when deciding whether to use a stepper motor or a DC brush/less servo motor is speed and open/closed loop control. Stepper motors are limited to (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Do It Yourself RF module????
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Hi, Now that the topic of RF commucation seems to arise again, I have a question too. After looking at the RF modules of radiometrix and linx I concluded that: 1. They are too expensive 2. They are probably not available here in the netherlands (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Help with overcharged batteries
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<<Last night we discovered that we had left our Handyboard on ZAP when we thought <<we had left it to trickle. It was left at this condition for about 6 hours. You probably should remove the battery pack, put it in a baggie, and take it to Radio (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Serial interface/ RF data link
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<<snip>> Unfortunately, I have not had any luck. This brings me back to the first point- is it possible to use the serial interface board by just providing the tx and rx lines? <<snip>> In short, no. The serial interface board takes power from the (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | persistent var's in IC
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Has anyone had problames with the Handyboard, IC 3.2 and 'persistent' variables? the following declaration works fine : persistent float i; but using an array: persistent float battery_voltage[ 320 ]; always causes an error while downloading : IC> (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Serial interface/ RF data link
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To properly comunicate with any PC you need to convert your TTL TX and TTL RX signals coming from the Handy Board to RS232 voltage levels. The charging board contains this interface IC called the "MAX232" The power wire is required unless you are (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Help with overcharged batteries
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Last night we discovered that we had left our Handyboard on ZAP when we thought we had left it to trickle. It was left at this condition for about 6 hours. This morning the motors are running very sluggish. Are our Handyboard or its batteries (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Serial Interface/ RF data link
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Sorry, the kit is from LINX Technologies (not LYNX) <A HREF="(URL)Linx Technologies -- Products</A> (URL) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Serial interface/ RF data link
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Let's say I want to use a serial interface board without the "charger", as the one provided with the Handyboard kit. The Tx and Rx lines are obviously required, but what about the ground and power lines?... Speaking of "easy to interface" data link (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | RE: expand memory HB
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I'm running IC 3.2 and am curious why this fails : #define HOURS 10.0 /* hours of logging */ #define INTERVAL 5.0 /* minutes between samples */ #define SAMPLES ( (60/INTERVAL)*HOURS + 1 ) float battery_voltage[ SAMPLES ]; the message on download is (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | expand memory HB
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Hi. I have a question, i want to build a Datalogger with my Handyboard. How can i simply expand the data memory, i need at least 128Kbytes of memory. Thank. Federico Santello E-mail:fedsante@tin.it (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: start_process() questions
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(...) Yes. The subroutine acts just like any other function that you call. (...) Once you do a start_process, that subroutine will run indepently and concurrently with your main program. It does not "run out of time"... it will continue to run until (...) (26 years ago, 8-Dec-98, to lugnet.robotics.handyboard)
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| | Re: two way radio question and data link
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Details on Radio Data Modules as follows: I have called ABACOM Technologies --new phone # (416) 236 3858) and this is probably your best bet for voice or data use. Data & prices are from Circuit Cellar Ink magazine TRANSMITTER * 30 x 10 x 5mm * (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | start_process() questions
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Hi, I'm using start_process() to run a set of processes. My questions() are: 1. does start_process() re-initailize all the called process's (local) variables every time it calls the process? 2. If the process does not complete before its alloted (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | SPO 256
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F.Y.I. B.G. Micro no longer is selling the Text to speech IC "CTS256A-AL2" they only have the SPO256 IC in stock. This was confirmed by B.G. Micro on 12/07/98. According to a few people they still sold them as pairs as of 08/98 If anybody else is (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | spo256 -Reply
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I bought both from B.G. Micro. (They were not selling the 3.12MHz crystal, however, I successfully used a slightly faster (3.26??) clock. I assume the pitch of the voice was a little higher but it worked. -Drew (...) Does anyone know who sell's the (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: spo256
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www.bgmicro.com about $5 or so for the chip ??? (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | re: www."hc11"
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wsomebody sent a list of www.'s from different source code for HC11 by mistake I erased please release then again thankx (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | communication problem
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Hi everybody I seek someone who can help me. I use handy board and xc40 board(it mounts xc4010 FPGA chip). And I have to make two board communicate each other. But there is a problem that I don't know the method. In handy board's F&Q page, It says (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Extra output for clocking (Using Hardware Output Compare)
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Hugo: I am not going to be able to answer this one fully. We will need to hear from others on the list to hear how to mix assembler code into an IC program, how to have the IC program modify assembler variables, and how to set up interrupt service (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | communication between two boards
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I use handy board and xc40 board(It has xc4010 FPGA chip) The problem is that they must communicate each other. But I don't know how I can make them communicate. In Q&A(at mit's handy board home page) it says that SPI pin can be used as digital (...) (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | spo256
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Does anyone know who sell's the SPO256 and CTS256A-AL2 IC's (26 years ago, 7-Dec-98, to lugnet.robotics.handyboard)
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| | Re: hbdl.exe download prob
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Shiva, When the Windows hddl.exe complains that it cannot open the port, it is usually due to another Windows programming using / holding that serial port. Try all the comm ports to see if hbdl.exe allows it to open one of them, then attach the (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two Way Radio question
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I would think so, assuming that you keep the data rate relatively low (IMHO, 9600 bps would probably be pushing it, 2400 may be better) --phil (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Two Way Radio question
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I am using a rug warior pro whose brain is very similar to the Handyboard and would like to know if these VHF radio Data Modules could be set up between the computer serial port and the Rug Warrior brain to provide a radio link instead of the 4 wire (...) (26 years ago, 6-Dec-98, to lugnet.robotics.handyboard)
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