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hi everyone, i need some help on controling the output voltage of the dc motor ports. the output voltage is 9.6V and i like to know if there is any way to clamp down the voltage to 5V or lesser. i try using a enternal resistor but the output signal (...) (26 years ago, 18-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Downloader and a/d
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Cesar, (...) According to my book, you can set the reference voltages to anything from Vss to Vss + 6.0 V (notice that this is higher than Vdd). The A/D result is a ratioatic comparison for the sample voltage to the references. Page 48 of the (...) (26 years ago, 18-Dec-98, to lugnet.robotics.handyboard)
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| | Replacing L293D with L298H
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Hi Fred and others, I very desperate to debug the problem that took place in my HD. When I download the P_code, it is successfully downloaded. However, when the next instruction ask to reset the board, no words of sentence appear on the LCD. Only 16 (...) (26 years ago, 18-Dec-98, to lugnet.robotics.handyboard)
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| | Downloader and a/d
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Hi friends! First thank you a lot for the advices on the FingerBoard. It really gets near to what I need, but that ram chip is another headake. So I believe more in a "light" version of the Handyboard right now, later I'll make a specific version (...) (26 years ago, 18-Dec-98, to lugnet.robotics.handyboard)
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| | Re: HD LCD problems
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(...) On a lark, I'll suggest that perhaps U6 is damaged. If you have another 74HC138 around, try swapping it for the one on your HB. I had a "similar" problem (although not identical) and was able to diagnose the 74HC138 as the problem. I too was (...) (26 years ago, 17-Dec-98, to lugnet.robotics.handyboard)
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| | RE: Hot serial interface board
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<<snip>> So here's my question. Does your serial interface board run hot, i.e. noticeably hot to the touch. On my serial interface board (version 1.1 as printed on the board) the white ceramic block gets very hot along with the power chip? in the (...) (26 years ago, 16-Dec-98, to lugnet.robotics.handyboard)
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| | A Poloroid Sonar question.
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I've got a poloroid sonar question. I got a hold of a Poloroid OneStep Sonar camera at the second hand store, but it does not seem to match any of the pinouts I've seen on the Web... This board has 16pins, I believe this board is manufactured by TI. (...) (26 years ago, 16-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Mapping
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Thanks for the tip on reflection error. I'll have to build in a function to weight the position accordingly. I'm trying to stay away from occupency grids and use the native vectors to conserve memory while maintaining accuracy. I may have to resort (...) (26 years ago, 16-Dec-98, to lugnet.robotics.handyboard)
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| | HD LCD problems
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Hi FThompson, Fred and other, I encountered some problem in the downloading. I was successfully able to download the p_code into the HD. However, When the instruction proned me to reset the board,it always appears on the LCD without any lettering (...) (26 years ago, 16-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Beginner's Help
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(...) I've never hot HBDL to work, and I've tried it on a 386 (laptop), 486 and Pentium. Don't know why: just won't work under win3.11 win95 or win98. The DOS one I've used with quite a bit of success. Make sure you are restarting the computer (ie, (...) (26 years ago, 16-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Beginner's Help
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Richard, Thanks for the help. I finally got the board to accept the pcode. I acquired a PS/2 mouse to free up my COM1 port. I used the HBDL.exe program that came with the board. After several unsuccessfully attempts to program the board, for some (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | 68hc11a1 x 68hc11a8 and IC hardware
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Hi people! I'd like to know two things: 1) Can I use the 68hc11a8 instead of the 68hc11a1 in the Handyboard, without recompiling Interactive C? 2) What's the minimum hardware to run Interactive C? I just want to blink a led to see if the hb is (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | HB Reset not executing main().
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I built two more Handyboards and I've noticed something odd. When I download a program with a main() function, and reset the board, main() does not get executed. I thought it was supposed to. I'm using IC v3.1 (for the Mac) and Handyboard version (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Beginner's Help
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Make sure that your com port 2 is actually wired to the motherboard I've heard a lot of stories with com ports not working because they forgot to connect the ribbon cable. Check that first. Try booting ito dos and use the DL.exe instead of the HBDL (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Re: some kind of dividing circuit?!?!?!?!
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In reference to your question about the motor with encoders. I know this isn't a software solution, but what if you used an external hardware (chip) counter that reset after 2^(number of bits) clicks. Then send resets as your steps to the (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Mapping
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(...) Watch the critical angle for the sonar too. If the sonar doesn't hit almost straight on, some of the energy will be reflected off at an angle, and may provide false longer distances. Smooth surfaces will have a lower critical angle then coarse (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Mapping
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I've just started experimenting with mapping and these are my thoughts on it. Drop the robot anywhere in its environment. The robot has a sonar hooked to a servo so the sensor can be scanned horizontally. As the sensor sweeps from left to right, (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Re: SRAM and orLCD problem
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eric, i don't have a definitive answer, but here are two things: 1. You *NEED* the reset chip, whether it's a DS1233 or the MC34064HC, I don't care, but you must have a device that asserts reset (pulls the line low) when the system voltage falls (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Mapping
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Hi, Could anyone tell me how a robot can do mapping in a room. Thank you (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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| | Beginner's Help
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Has anyone had this problem: I am running win 98 on P200 MMX, and com1 is used by a serial mouse. I just bought the board, serial expansion board, and cables from Gleason Research. Comm2 is usually used by my internal modem, but I removed it and (...) (26 years ago, 15-Dec-98, to lugnet.robotics.handyboard)
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