 | | Miniboard/download mode
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Hi all, I have a miniboard I built recently that won't go into download mode. In the note called "mb-debug.txt" on ftp://Cherupakha.media.mit from Chuck McManis he describes the exact problem I have. "If the RED LED light ups, or the motor LEDS (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Other batteries...
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Is it ok to use batteries of the sealed lead-acid type (from a UPS). I have V 7.5 Ah and I was wondering if the battery charge circuts would work correctly if I simply replaced the NiCd pack with the lead-acid battery. Are there any considerations (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Re: I overcharged my handyboard.
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(...) What is the battery voltage? Does it work with a different battery or DC adapter? --Will , , __@_/ \_@__ |/ | /__, o @_/ )\ ) ( \ (\/\\, ~~~...~~~ ' ` ~~~...~~~ ` ~~~...~~~ Wendy Parson, Virtue is insufficient temptation. Will Bain, & Tatoosh (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Watchdog and Handyborad.
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Anyone konw if is possible to implement a watchdog in the Handyboard? I try but the program hangs when i try to display something in the LCD. Thanks in advance. Germán Gentile (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | RE: low-cost robot platform
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The platform in question was based on the 'Hercules' r/c car that is available at some of the FAO Schwarz stores. This platform appears to be identical to what was used by the USC entry in the 1997 Robo Cup competition. Clem (ctaylor@SRTC.COM) has (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | low-cost robot platform
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A couple of weeks ago, someone wrote and said that Todd Graham had told them where to get a "cool, low cost" robot platform. I was wondering what, where, and how much was that platform? Information would be appreciated. thanks james jones James C. (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Serial Communication %!*#!!--Please Help
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Hi Peter, There was recently a discussion on the list where it was revealed that the network style cable does NOT work to connect to HB's together. If you go back to the FAQ there will now be correct instructions for making a cable to link two HBs. (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | finding handyboard parts
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Hi all This is a list i compiled when building my handyboard. I found some parts Quite hard to find and spent a lot of time reading through catalogs etc. So i thought it might save someone a lot of time. The list is pretty much complete and i now (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Re: 32V DC Motor
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While on the subject of motors and H-bridges. I recently ordered a L298 based motor controller kit from JCM Electronics. Unlike the L293, the L298 supports breaking and has two bits for direction and one enable bit. It would be easy to add use an (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | 32V DC Motor
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hi i'm trying to use the handy-board to drive a 32V DC motor. a webpage at the handyboard website showed that this can be done by cutting the original power trace and simply plugging in a new external power source(a 36V battery pack?). what i would (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Serial Communication %!*#!!--Please Help
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I need for two HBs to communicate via the serial port. I'm using the "network" style cable. With Randy Seargent's serialio routines and the code that is in the HB FAQ. Please Help my project is due the Monday after Thanksgiving. Any input would be (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | HB not responding
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Hi, I have successfully downloaded the pcode_hb.s19, but my computer can't synchronized with my Handy board. It always return the message "Handy board not responding". What should i do now ??? I'm using Windows 95 on a 233Mhz machine, and i have try (...) (26 years ago, 18-Nov-98, to lugnet.robotics.handyboard)
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| | Availability of Expansion board?
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What is the status of the Handyboard expansion board? The latest page update from Fred appears to be Jul 20th, and indicated that the board might be available at the end of the summer. Todd (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | PE4
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Hi : It is given in the standard ir_detect() routine that the detector should be connected to PE4? Can anyone tell me what is PE4 ? Is it the same as analog input 4 ? Thanks . Rajbala (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | RE: 32V DC Motor
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Greetings, We are using a LMD18200-based H-bridge circuit from Wirz Electronics to drive our motors. We simply removed a L293 chip from its socket and ran the signals (a short distance) to the LMD18200 circuit. Marco A. A. de Oliveira (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | RE: 32V DC Motor
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Just a quick note.. As i remember if you stack the SN??? chips to get the current rating you also have to piggyback a L293D as these incorporate the anti-spike protection diodes as the others don't Russ..... -----Original Message----- From: MAR (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | LEGO: looking for gears
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Is there an inexpensive way to get a large assortment of many LEGO gears? Third parties? -Doug Blank (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: 32V DC Motor
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There's an alternative to th4e L293D chip that fits the Handy Board. This chip can supply 1A. I know you need 2+ Amps but a common method adopted by some people is piggybacking two or more chips. (You put one on top of another to allow the curent to (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Please use subject headers on all mail
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(...) Thanks Liddy PLEASE !!! Use subject headers on your e-mail. Beam; Handyboard; PIC; MICROE; MicroMouse; Motors; LEGO; and etc. Any letter case is better than no classification of the subject. Thanks Ed Spike 73,33 -- (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: 32V DC Motor
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Edmund, I recently received 2 LMD18200 chips from National Semiconductor through their free samples order (limit 2/day, 5/week). These chips deliver up to 3A continous output, and up to 6A peak. They are ideal for driving DC/ Stepper motors. All the (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: motor port problem .
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Philip I would first suspect that the motor chip has blown. This is eash to check since the Handy board has two L293 chips. Swap them (disconnect your motor connections) and run testmotors(). If the problem follows the chips, replace the bad one. (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: I overcharged my handyboard.
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Madhu: I would be very surprised that you overcharged the batteries to the point of no function. Your batteries would have to have gotten very hot for that time (batteries deteriorate in a charger due to evaporation of electrolite water). Generaly (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Re: motor port problem
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you may have blown one of your L293D chips. try swapping the two chips to see if the problem then migrates to motor 1. if it does, then you have blown an L293D. there is more info on debugging motor problems in the FAQ. See the answer to "One of the (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | RE: Which M68HC11 to use
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I am using the E1FN version myself without any problems (after getting through some problems during implementation). I believe that the F describes the type of package used (square version as needed on the 'standard' board). Ronald (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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| | Which M68HC11 to use
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I am planning to build a HandyBoard, and am in the "Gathering Stage". I just recieved the docs from Motorola; the "HC11 Reference Manual", and the "MC68HC11A8 Programming Reference Guide". The Parts list for the HandyBoard calls out for the (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | I overcharged my handyboard.
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I think I overcharged my handyboard, I chargedf it for two days. I charged my handyboard using the Normal charge method. My handyboard is not responding at all. There is no power bulb glowing. Do you have any solution. I had to complete my project. (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | Please use subject headers on all mail
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thanks (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Request for Books on Robotics
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Mobile Robots: From Inspiration to Implementation by Joseph L. Jones, Anita M. Flynn; As its title suggests, this book convers everything you need to know to build a mobile robot. They discuss the design of their brain (a MC68HC11 design that looks (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | correct procedure when downloading pcode_hb.s19
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hi I am at present building a handyboard from Fred's assembly manual, however it appears I might have a problem. I have connected the serial interface board to the handyboard. The hb is placed into bootstrap mode by holding down the stop button. The (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | motor port problem
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hi, i really need help urgently. Currently, I running my robot using 2 DC motor on port 2 & 3. I used external power supply to the L293D (pin 8). I did not cut the trace. I used Alkaline battery 12V recharagable . when I run my robot, it is running (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | (no subject)
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Hi! all, I charged my handyboard for two days. Any problem iam going to get. Please respond me quickly as i had to do my project. thank u. Madhu (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | Broken Board (SPI??)
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Hi, I'm using the Polaroid 6500 ranging board with the sonar routines on the HB web site. When I call the sonar on one HB it returns -1 but when I try it on another HB it works fine. So it isn't the sensor. Could anyone tell me which conections on (...) (26 years ago, 16-Nov-98, to lugnet.robotics.handyboard)
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| | Request for Books on Robotics
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Could people please recomend some books about lego robots, using the handyboard or other controllers, or more general textbooks on the topic of educational robots? Thank you, Rachel Arens (26 years ago, 14-Nov-98, to lugnet.robotics.handyboard)
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| | Re: Monitoring household power consumption
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Hi all, I found an interesting article by Don Lancaster in May 1998 issue of the magazine, Electronics Now. Maxim makes a chip (MAX125) that will convert accurately four channels of analog data to 13 bits accuracy, plus talk about a device for $79 (...) (26 years ago, 14-Nov-98, to lugnet.robotics.handyboard)
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| | Re: NiCd Charger
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Russ: In a message dated 98-11-13 04:48:38 EST, you write: << ... power rating of resistor = 15Volts * 200mA = 3Watts Series resistor needed = 75 Ohms @ 3 Watts. ---...--- ------- The 75 Ohms bit seems reasonable to me but 3Watts must be way to (...) (26 years ago, 14-Nov-98, to lugnet.robotics.handyboard)
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| | Re:
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Hi everyone, The mistake you make in your calculation is that in your calculation you take the entire 15V for the resistor and this leaves no voltage for charging your NiCad. Do the same thing again and deduct your NiCad voltage from the 15V you (...) (26 years ago, 14-Nov-98, to lugnet.robotics.handyboard)
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| | FT639 and Lynxmotion IRPD
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Has anybody try to interface a FT639 to a Handy Board ? Has anybody try to interface a Lynxmotion IRPD kit to a Handy Board ? (26 years ago, 13-Nov-98, to lugnet.robotics.handyboard)
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| | Re: how to adapt a voltage signal?
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You could use resistors to make a 1/10 voltage divider. If you need high input impeadance, you could build an Op-Amp circuit to divide the voltage by 10. Most ADC chips have a pin that is the reference voltage for the high end of the scale--set this (...) (26 years ago, 13-Nov-98, to lugnet.robotics.handyboard)
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| | how to adapt a voltage signal?
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greetings to all i dont know if it has been asked before, but im trying to use son extra ADCs on my handyboard, trouble is they have a 0 to 5V range (analogue) but im trying to adapt the signals in the ranges of 0 to 50 volts, how do i make them (...) (26 years ago, 13-Nov-98, to lugnet.robotics.handyboard)
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| | Re: your mail
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(...) 3 Watts is correct. Look at the resistor on the HB charger board. It's pretty hefty too. -Scott (26 years ago, 13-Nov-98, to lugnet.robotics.handyboard)
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