 | | Re: Manipulate the LCD in assembler
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Folks, I gave it a little more thought, and had some coffee to wake me up. I remember now! Somehow I blew out the D0 line on my LCD and I had to use 4 bit mode from then on since the upper 4 addresses were still fine. I had forgotten that a long (...) (27 years ago, 28-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Manipulate the LCD in assembler
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At 11:28 PM -0400 on 8/26/97, German Gentile wrote: Folks, Ok, I took a look at the code last night. I found simple errors like not initializing the stack, addressing variables in RAM chip when in single chip mode and forgetting to use # for (...) (27 years ago, 28-Aug-97, to lugnet.robotics.handyboard)
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| | RE: Size Conversions
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These sizes refer to the Unified Thread Standard. A 6-32 thread has 32 threads per inch and a nominal outer diameter of 0.138 inches. There are coarse (UNC) and fine (UNF) series (and some others that are less common), as follows: nom size major dia (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | IC under NT
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(...) IC 3.1 for Windows 95/NT is written from the ground up as a 32-bit windows application, so the serial works fine under NT, regardless of the speed of your machine. If you want to try it out to see if it fixes your problem, here's a 7-day (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | digital ins
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Hello again, I realized a solution to the amplified input problem that is simple and at least worth mentioning. A diode clamp (0-5V) does the job quite nicely, and is easy to build. I got the idea from Horowitz and Hill, "The Art of Electronics", (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Help!!!! Handy Board Problem
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I am going to guess this is a software problem on the PC side. If you can boot your computer in DOS mode, try running IC then. Or find an older box :-(. Freeware DOS IC is known to have serial line comms bugs with some fast machines. NT can't be (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Size Conversions
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I apologize in advance as this question is completely of the list topics but I hope that somebody will have the answer. I am currently building a six legged walker using the Handyboard as the main CPU and using a modified Miniboard using the Servo16 (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Microphone on a Handyboard
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If you need more than a +200 gain, try an LM358 in single supply mode and use +5v. These are fantastic op-amps and widely available (Digikey). jm (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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If you want to exaggerate the response, perhaps a LM339 +5v single supply comparator will do. Set up your circuit to go high(+5v) above your 2-3v range of operation. This solves all your input problems. Loads of manufactures make this thing. Data (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Microphone on a Handyboard
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(...) Assuming you've hooked the LM386's ground to ground and the + voltage to 5v, you should be set hooking the output of the LM386 to the analog input. Do not insert a capacitor in series, as might be shown for hooking up the LM386 to a speaker. (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | microphone as a sound sensor?
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Hi all, has anyone interfaced a microphone to an analog input of the HB? I've amplified the signal with an op-amp (LM386) but can't figure how to integrate the (AC) signal into a usable voltage range for the HB. I don't think that just rectifying (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Manipulate the LCD in assembler
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I have write a code for manipulate the LCD in the handy board. Because i can't use a battery backed RAM, i need to write in assembler. Well , i'm really read all the FAQ for LCD and for Handy board (including the apendix B for the 6270) .I'm using (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Help!!!! Handy Board Problem
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Hi! I'm currently assembling the handy board, and i got to the stage where i have the bare minimum to run IC. The problem starts when I try to send commands from IC (ver 2.851) to the handy board (running v 2.81). About 85% of the time i get the (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | 68HC11's inputs
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John, Thanks for the excerpt. Ouch. On first read, it looked like the 6811's input pin was beefier than I had originally thought. On my second reading, I realized that my hack probably is in fact outside the specs for the chip, so if you're trying (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) From the pink book (rev 3): pp. 2-24,25 "2.4.3 Internal Circuitry - Digital Input-Only Pin ...When the pin current is increased to very high levels (typically more than 100mA, specified limit is 25mA), physical damage can result. [...] As (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) ... (...) Chuck is right about the correct solutions. For a less correct solution, you can take advantage of the fact that HC parts (including the 6811) have built in voltage limiters that are only good for fractional milliamps (in some cases (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) 5.12 volts (...) Yes. (...) 5.12 volts max, 0 volts minimum (...) The correct solution to your problem is to use an op-amp signal conditioner, possibly feeding into a schmidt trigger if you need some hysteresis. (sp?) You can also rig a zener (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Adding to the data bus
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After looking at the addressing scheme on the handyboard and determining it is possible to add a number of more outputs and inputs by extending the data lines to another board and using the free lines comming from the 74hc138. I built a robot arm (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | digital ins
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Hi all, At what voltage on the digital ins does one risk damaging the HB? I want to feed an amplified signal to the digital ins on my HB to exaggerate the response of a photosensor in the 2-3V range of its operation. Unfortunately, this means that (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | IC memory usage
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(...) IC 3.1's pcode is structured the same way. -- Randy ---...--- Randy Sargent Newton Research Labs Senior Design Engineer Robotic Systems and Software rsargent@newtonlabs.com (URL) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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