Search found 20 matches

by Cerf
Sun May 22, 2005 11:07 am
Forum: General Discussion
Topic: bse2 and cmos 4021
Replies: 1
Views: 768

bse2 and cmos 4021

Hey,<p>I have a bse2 and a cmos 4021. What I want to do is get the basic stamp to read the information comming off the shift register. Can anyone help me out with a basic schematic. I can do the programming myself, but being a hobbiest, I am unable to understand and put everything togeather
by Cerf
Thu Apr 07, 2005 5:33 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by stephen: The IM6402 is listed by B. G. Micro at $2.45 (www.bgmicro.com).<p>Alternately, a programmable logic device such as the Xilinx XC9500 series could be used. These are available from Digi-Key...
by Cerf
Thu Apr 07, 2005 12:46 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by stephen: The easiest UART to use might be the venerable 6402. This might still be avaliable as surplus or from Harris or Intersil. Earlier parts used multiple power supplies. Later parts had intern...
by Cerf
Wed Apr 06, 2005 4:38 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Jolly Roger: This can be done and there is a commerical product available to do this. See here:<p> http://l3sys.eskimo.net/kb232/ <p>While somewhat expensive ($79) all the work has already been don...
by Cerf
Tue Apr 05, 2005 2:34 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

if I connect a usb keyboard to a usb to serial converter cable, and I were to open up hyperterminal and type the letter "a" on the usb keyboard, will I get an "a" in the hyperterminal?<p>Does anyone know how rs232/serial communcation differ compared to usb communications?<p>To be honest, I am lookin...
by Cerf
Tue Apr 05, 2005 12:59 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

It looks like I cant get any interrupt routines on the basic stamp 2. Therefore it looks like I'm going to go the way of a 68HC705J1A single chip microcontroller. But before I make any final decision, I just wanted to ask: How is it programmed? I have a general idea, after writing the code, it is co...
by Cerf
Sun Apr 03, 2005 3:16 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

Does anyone know if a keyboard's clock signal is internal or external to the keyboard.<p>Eg, if I powering the keyboard gnd to ping 2, +5v to ping five, will there be any signal on 1 (kbd clock)? or will I have to supply the clock externally?
by Cerf
Sun Apr 03, 2005 1:08 pm
Forum: General Discussion
Topic: Parallax Basic Stamp II Interrupt Service Routine
Replies: 1
Views: 762

Parallax Basic Stamp II Interrupt Service Routine

Hey,<p>I was just wondering if there is a way to write an interrupt service routine on the bassic stamp II?<p>For instance, every time P0 becomes high (on the rising edge) an ISR is called
by Cerf
Sun Apr 03, 2005 1:05 pm
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

Re: connect keyboard to serial port

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by sofaspud: What is this supposed to be when completed? Are you wanting hyperterminal to read in from COM1 and write out to COM2 or some such? <hr></blockquote><p>This is no school project if thats w...
by Cerf
Sun Apr 03, 2005 10:21 am
Forum: General Discussion
Topic: connect keyboard to serial port
Replies: 18
Views: 4726

connect keyboard to serial port

Hey,<p>I was just wondering, is there any way to connect a seccond keyboard to the rs232 port. So lets say I type an "A" on the keyboard, an "A" will appear in a program such as hyperterminal?<p>I noticed this from beyondlogic http://www.beyondlogic.org/keyboard/keybrd.htm <p>But it talkts about con...
by Cerf
Sun Apr 03, 2005 10:09 am
Forum: General Discussion
Topic: chip abbreviations
Replies: 3
Views: 1153

Re: chip abbreviations

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by sofaspud: The web is often unkind to the display of subscripts. Whenever you have doubts, the datasheet for the part will usually provide a definition or description of the pins. Vss = source power...
by Cerf
Fri Apr 01, 2005 5:20 pm
Forum: General Discussion
Topic: Pull down resistor
Replies: 10
Views: 2220

Re: Pull down resistor

What about biasing resistors seen here:
http://www.geofex.com/Article_Folders/cd4053/cd4053.htm
by Cerf
Fri Apr 01, 2005 4:56 pm
Forum: General Discussion
Topic: chip abbreviations
Replies: 3
Views: 1153

chip abbreviations

Hey,<p>I'm looking at some schematic diagrams here, and there are abbreviations on the pins that discribe their function. Some of them I know what they mean, but I dont know what they stand for. Other abbreviations I dont recongnize.<p>Can someone shed some light on: Vss Vcc Vdd INH<p>These are only...
by Cerf
Thu Mar 31, 2005 5:59 pm
Forum: General Discussion
Topic: Pull down resistor
Replies: 10
Views: 2220

Pull down resistor

Hey,<p>I was just wondering in the circuit diagram here:
http://www.doctronics.co.uk/4016.htm<p>what is the purpos of the pull down resistor? If at all possible can someone post a link to some literature explaining the need/theory of it.<p>Thanks
by Cerf
Wed Mar 30, 2005 12:50 pm
Forum: General Discussion
Topic: Audio Control
Replies: 20
Views: 4334

Re: Audio Control

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by sofaspud: audio signals coming from, and where are they going to? <hr></blockquote><p>No! Its classified ;) <p>Its comming from my computer, and it will go to the computer's speakers or to a stero ...