 | | 74hc237
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Hi! I'm a little in a trouble..... I cannot find the ic 74hc237 (3-to-8 Decoder/Demultiplexer with Address Latches) marked U5 on the expansion board......... I have two questions: 1) Can i replace this part with an equivalent one? 2) If (...) (23 years ago, 1-Dec-01, to lugnet.robotics.handyboard)
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| | about peek() and poke()
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Hello, I have some questions about serial communication of the HandyBoard to PC. I tried to write to the serial line from HB. But I found that peek() and poke() functions don't work. (I used "list functions" to list all the functions available, and (...) (23 years ago, 29-Nov-01, to lugnet.robotics.handyboard)
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| | Re: Controlling HB using PC serial port
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(...) I would posit that the easiest way is to use the serial cable. Then you don't have to do new cabling or only work with the digital pins which can also do output. Plus you're not spending your digital ports. You could also go through the SPI, (...) (23 years ago, 25-Nov-01, to lugnet.robotics.handyboard)
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| | Re: Controlling HB using PC serial port
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Yes you can. The easiest way is to use some of the digital inputs and connect them to the parallel port pins. Then using QuickBasic or any parallel port program you can "send" commands to the HandyBoard. If you want to use the serial port then I (...) (23 years ago, 25-Nov-01, to lugnet.robotics.handyboard)
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| | Controlling HB using PC serial port
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Hi all, I am new to the HB world and I am wondering if I can use my computer (PC with Windows OS) to directly control the motors and sensors installed on the HB. Please assume that I have no problem in writing a program for the PC to communicate to (...) (23 years ago, 25-Nov-01, to lugnet.robotics.handyboard)
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| | GP1U52 and Polaroid 6500 Sonar in the UK
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Does anyone know of a UK source of the 2 above components (Not Maplins or RS)? (23 years ago, 14-Nov-01, to lugnet.robotics.handyboard)
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| | New LEGO Robotics Web Page
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All, The University of New Mexico's LEGO Robotics page has been extensively updated. Please drop in and check it out: (URL) In short, we build autonimous robots out of LEGOs and control them with the Handyboard. Make sure and check out the 2001 (...) (23 years ago, 13-Nov-01, to lugnet.robotics.handyboard)
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| | PLEASE I NEED HELP
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Hi! I see that i've a real common problem, that's it: Now, i'd read "Windows Serial Line Debugging" and i'd follow its test sequence. But my problem still remain, on I/C board, i notice that, untill the complete discharge of the mainboard C3 (...) (23 years ago, 12-Nov-01, to lugnet.robotics.handyboard)
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| | Re: IR port
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Am Sonntag 11 November 2001 22:04 schrieb Fred G. Martin: (...) Aaahhh, 6.81K gives me 43kHz - I think I will have a look at some higher values. I did not know that the HC132 could be that much of a difference! Big THX! Chris (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
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| | Re: IR port
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see the v1.21 parts list in the hardware section, for the following info: re: R4's value. Depending on the variety of the manufacture of the HC132 chip, R4 should be either 3.83K (Digikey 3.83KXBK-ND) or 6.81K (Digikey 6.81KXBK-ND). To test this, (...) (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
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| | IR port
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Hi $ALL! I just assembled a handyboard. The assembly documentation (hba.pdf) says, that there should be a ~40kHz square wave at pin 2 of U9 (HC04). My frequency counter shows 72 kHz... So I took a new capacitor (682) and a new resistor (3k83) but (...) (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
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| | RCX to Handyboard
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Is is feasible to have an RCX 'talk' to Handyboard via their respective IR systems?? Which one would be the easiest to program to understand the other? (23 years ago, 8-Nov-01, to lugnet.robotics.handyboard)
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| | Inaccuracy Sonar Reading
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Hi there… I have downloaded the sonar.c and it is running properly. In order to calibrate the sonar, I have placed my robot in a different distance from the obstacles. From all the obtained data, the reading always ~ 6cm or ~13cm more the actual (...) (23 years ago, 6-Nov-01, to lugnet.robotics.handyboard)
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| | Re: Barry Brouillette's GP2D02 Page?
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(...) Hi, Sorry for the delay in fixing this. I left SGI two years ago and they finally killed my page. The content is back up and should stay up at: (URL) (23 years ago, 6-Nov-01, to lugnet.robotics.handyboard)
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| | Optical mouse
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I want to interface an optical mouse with the Handyboard for positioning purposes. What is the best and the easiest way to do that! The oprical mouse that I have has USB nad ps/2 port. Q1: Do I use the handyboard's (serial interface and Battery (...) (23 years ago, 30-Oct-01, to lugnet.robotics.handyboard)
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| | RE: Help needed
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Thank you for your reply, Fred. We finally solved the problems we had. We can not make the downloader program work with Windows operating system (I have Windows 2000 running on my computer). All we have done is going to MS-DOS prompt, type "dl (...) (23 years ago, 29-Oct-01, to lugnet.robotics.handyboard)
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| | Re: Help needed
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Hi Yuwei, it sounds like you might be having problems with your serial port. Would you try the getting started debug instructions at : (URL) let us know how that goes. Fred (...) (23 years ago, 29-Oct-01, to lugnet.robotics.handyboard)
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| | Help needed
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Hello, We are using Handy Board for the first time. We first charged the Handy Board. Then we tried to download the file pcode_hb.s19. The problems we are having are: 1. We had downloaded the file once, but at the end of the process, we saw an error (...) (23 years ago, 29-Oct-01, to lugnet.robotics.handyboard)
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| | Barry Brouillette's GP2D02 Page?
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It looks pretty down, anyone know a mirror? Or have a copy of the contents? Please? And thank you! Michael (23 years ago, 27-Oct-01, to lugnet.robotics.handyboard)
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| | new sony-ir, FFT routines!
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courtesy of George Musser.... Fred (...) (23 years ago, 25-Oct-01, to lugnet.robotics.handyboard)
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