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 | | Re: Corrupted or Invalid Pcode?
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| James, Thanks for following up. The reason for this behavior should be fairly evident -- there are traces very close to the mounting screw holes. Your metal washers must have shorted them together, affecting wires to the memory. I do mention to use (...) (27 years ago, 11-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Vector 2x giving me lots of trouble...
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| Hi all, I am having lots of trouble with the vector 2x compass. Sometimes it seems to work fine. Other times it just ouputs zeros (like someone else was saying...). I checked all the physical wiring, and that seems to be fine. The strange thing is (...) (27 years ago, 16-May-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Downloading problems
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| (...) please download the latest 6811 Downloader for Macintosh, just posted last week on the HB web site. Fixes compatibility probs. (...) th the (...) OK, yes, you've already downloaed. (...) plus (...) please download these files from the HB web (...) (26 years ago, 27-Dec-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Yup, it works.
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| (...) I really tried hard to make this clear -- can you explain the difficulty you had? (...) Yup, you are right. You are either the first person to notice this, or the first to report it! (...) Quiescent RS-232 levels are -10v, so the minus voltage (...) (28 years ago, 3-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Sample bump sensor routine
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| whether you use analog or digital ins, you don't need the 47k pullup because the hb already has one. just wire the signal line to ground through the normally open switch. bill, i suggest you write your program without using the multitasking (...) (28 years ago, 4-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: U14 problem
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| Firstly, 19.9v is a normal unloaded voltage from a 12v DC adapter. The reason: these common wall adapters are unregulated, and voltage output varies inversely to current. I.e., if there is no load, the voltage is higher than the rated voltage; if (...) (28 years ago, 15-Nov-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: PCS Troopers are GO!
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| Chris- This is yet another beautiful creation. The intricacies of the design are functional and elegant. I'm a huge fan of "modular" vehicles, and clearly, there are a multitude of opportunities available for this one. The greebling is (...) (20 years ago, 13-Apr-04, to lugnet.space, FTX)
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fred
(score: 1.028)
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| | Re: Assembling the HandyBoard
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| (...) You need that resistor to stabilize the crystal frequency. Try Radio Shack if it is missing from the kit. It doesn't have to be 1/8 watt, 1/4 or 1/2 watt is fine, just make sure it is 2.2 megaohm. (...) So far so good. (...) There is probably (...) (28 years ago, 26-Dec-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: analog input test
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| If the sensor headers look like this: live signal [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [X] +5v [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] ground [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] (...) (27 years ago, 7-Feb-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Motors & handyboard
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| (...) how did you take this measurement exactly? I think 75 mA might be kind of low, most motors will draw this much when they are just spinning but doing no useful work, but then draw much more when they are driving a geartrain. (...) actually, (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: Buncha bouncebacks
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| Sorry, there is nothing I can do about this short of compiling, installing, and configuring brand new mail list software from scratch. The mail list SW my lab provides is very primitive and can't do anything intelligent with bounces. I don't really (...) (28 years ago, 30-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Interrupt for serial data
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| Jan-Sipke, You're really pretty far away from having this work. It's not just a matter of redirecting the serial interrupt; when you get there, you have to: * store incoming character in a buffer * advance the buffer pointer * check the buffer for (...) (27 years ago, 13-Feb-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: 600 mA Limit
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| The 600 milliamp limit is per channel, but for a given motor, two channels are wired in series. So you don't get 1200 milliamps per motor but only 600. This would still yield 1200 milliamps per chip, since there are drivers for two motors. Also, if (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: Charge polarity on each board opposite?
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| (...) right; randy sargent's dl does automatically check the config and burn it if it's wrong. so your config is probably okay. (...) wait; you mean "pcode_hb.S19," right? when it downloads it doesn't give any errors? but the pcode still won't run. (...) (28 years ago, 5-Sep-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: voice synthesis
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| Jeff, JDR Microdevices sells the General Insturments CTS256AL2 chip (GI8642CAA) for ** $4.95 **. This is (I think) a slightly newer version of the same chip that Radio Shack used to sell. I bought one of those with an order from JDR, but haven't had (...) (27 years ago, 5-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: power and servo
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| [problem 1: voltage on motor chips when no motor voltage applied] This is normal, because the motor chip INPUTS have +5v signals on them. These signals "bleed" into the motor chip power supplies. This isn't dangerous, but it isn't particularly good (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Battery question
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| If you connect the batteries in parallel you will increase the current which is something i'm not sure you want to do. if you connect them in series it will increase the voltage which is what i believe you would like to do. the problem comes because (...) (25 years ago, 10-May-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Using low voltage motors
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| In your message you said: (...) What do you mean, "from the 20V range"? the HB supplies about 8 to 9v to its motor outs. a 30 ohm resistor would be about right for the 200mA current level. The resistor would drop 6v leaving about 2 for the motors. (...) (28 years ago, 23-Apr-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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