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Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.
We found 60 threads matching "rs232"
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The most relevant threads are listed first
Re: microcontroller
BobG - 2006-12-29 09:46:00
akhilpatel2001@gmail.com wrote:
> [does] anybody know [how to] interface[ing] [a] micro controller usi[n]g vc++ with PC.
==========================================================
Plug RS232 cable from DB9 on microcontroller to DB9 on back of PC. Use
windows functions 'createfile, readfile, an...
seven segment display
2006-09-22 12:28:00
Hello,
I am attempting to find a (multiplexing)seven segment display
driver capable of driving at least 5 7seg drivers. I have found many
but it seems they all have a synchronized serial input like SPI, but
most of them are I2C. I would imagine this is to make designing with a
uC easier, ...how to do it? RS232
RsK - 2006-11-18 10:26:00
Please anybody can give me a brief idea that using oscilloscope how i
can capture the waveform on a serial link, tranmitting the ASCII letter
'R' with 1 start bit, 1 end bit, 1 parity, with 1200 Baud.?
I have connected oscilloscope with serial interface then? then selected
the CH1 & CH2 then ...Wireless RS232
Bart - 2006-09-17 19:11:00
I'd like to accomplish wireless RS232 between two computers running
hyperterminal or procom without any additional software/programming, using
the standard com ports (DB9).
Once again I'm Googled out. At first I thought I could splice into a pair
of FRS two-way radios, still thinking about i...PIC MPLAB programmer I/F.
ian field - 2007-11-19 09:41:00
Does anyone have any info on whether MPLAB has RS232 compatible programmer
support?
Having downloaded a number of programmer schematics, I've found that a
couple (Serpic & David Tait) that are very similar to the Velleman K8048 and
wondered if this is some sort of industry standard.
If anyo...programming atmel chip
freeze - 2008-01-19 06:45:00
i need to program the at89c51ed2(atmel chip). i am using the usb-rs232
for this purpose. all my circuit connections are properly wired n
everyhting recheked a thousand times. but still, the programming
software that i use, in order to program the chip, gives me a
'connection time out' error. hav...Re: RS422 inverted
john jardine - 2006-10-14 08:47:00
wrote in message
news:1160804649.155231.107600@e3g2000cwe.googlegroups.com...
>
> Chris wrote:
> > bob@coolgroups.com wrote:
> > > I am reading RS422 data into a computer. However, the data is only
> > > correct if I flip the bits (one's complement). Any ideas why?
> > >
...rs232 question
malua mada! - 2008-04-01 13:57:00
I have a controller that talks rs232 ,driven by a MAX232.
3 wires only.
I connect the computer to it: works fine.
I am connecting a StarTech NETRS2321E Net adapter to it. Won't work.
Loopback plug instead of controller: works fine.
Since the harness on the controller side includes a DB9 tap I d...remote monitoring
alitufan - 2006-11-12 07:56:00
I need to help for my project which is telemetry disagn for to sent sun
car's or hydromobile's information(current, voltage,speed,...) with
mobile telephone via RS232 to pitstop.
...serial network
=?windows-1256?B?4+Xkzw==?= - 2008-04-19 03:46:00
how can i use visual basic for serial network using 89c52 and rs232
using 9 bit protocol
...Re: design help
Jan Panteltje - 2009-02-28 13:44:00
On a sunny day (Sat, 28 Feb 2009 09:55:21 -0800) it happened John Larkin
wrote in
:
> I recently did...
>
> http://www.highlandtechnology.com/DSS/T346DS.html
>
> which has over 250 distinct serial ascii commands, and I'm just
> finishing a serious upgrade to this,
>
> http://www....Re: Digital push-button selector switch?
Tom2000 - 2007-08-24 03:35:00
On Tue, 21 Aug 2007 21:23:58 -0700, liberalsurfer@gmail.com wrote:
>
> I'm trying to build a selector switch using momentary push-buttons to
> achieve the following effect: you have a row of push-buttons each with
> an LED next to it. When you push one of the buttons, its LED lights
> up. Wh...Re: Joule Thief - still not working....
default - 2009-08-10 06:46:00
On Sun, 9 Aug 2009 20:17:32 -0700 (PDT), fungus
wrote:
> On Aug 9, 10:24 pm, default wrote:
> >
> > That's the beauty of them. Only need a solderless breadboard and
> > maybe a 9 pin RS232 connector plus 2-3 resistors.
> >
>
> It might be worth getting a proper PCB and a ZIF so...Re: Open Instrumentation Project News #7
2008-03-04 09:27:00
In sci.electronics.design Bob Monsen wrote:
> FYI:
> A basic oscilloscope can be had from fpga4fun.com for less than $100.
> http://www.fpga4fun.com/Hands-on_Flashy.html
> It supports 100MSPS, and it's rs-232 based. You need to build it yourself,
> but it looks pretty simple.
Yes RS2...How to send a signal from PC to a circuit board?
2007-01-11 14:31:00
Hi
I am working on a project where I have to send signals from a PC (RS232
or USB?) to a 4-to-16 decoder. Basically, I need a way to send signals
from a PC to drive the 4 inputs of the decoder. Anybody knows an easy
way to do that?
I am looking for the hardware and IC components necessary t...Re: O-scope question...
David L. Jones - 2008-11-06 06:46:00
"sbrehler" wrote in message
news:Q4ednWcw4O2fTYzUnZ2dnUVZ_vninZ2d@earthlink.com...
> I will be working mostly with discrete components and microcontrollers
> with relatively low frequencies/clock speeds; will a DSO present any
> difficulties along those lines.
Actually, for microco...Re: bike computer to PC interface
Lord Garth - 2007-03-07 13:38:00
wrote in message
news:1173287192.402131.180590@n33g2000cwc.googlegroups.com...
> Hi All - I found this newsgroup and was wondering if anyone could help
> me.
> I'd like to connect a magnetic sensor (bicycle computer) directly to
> my computer through one of the ports without a power su...Re: LED Circuit?
Andrew Holme - 2008-03-14 20:51:00
"Drew" wrote in message
news:4686af4a-5048-4c85-9a3a-25fd0441b61e@h11g2000prf.googlegroups.com...
> I'm trying to apply a tally light system: a Panasonic video switcher
> that sends a signal, and I want a couple of LEDs to turn on 150ft.
> away whenever that signal is on. That's it.
> ...Re: please help me about my ultrasonic project!please
Sjouke Burry - 2007-08-12 19:39:00
E.persia wrote:
> hi everybody
> excuse me Ihave a project about ultrasonic for measurment of distance
> beetween two cars!
> its not for avoidance of hit!it for reducing the speed to keep the
> standard distance between two car
> somy need is about 30 or 40 meters
> its very long dis...Re: How to use TX/RX on a PIC
petrus bitbyter - 2006-11-13 15:42:00
"hybrid_snyper" schreef in bericht
news:1163434042.977407.256000@i42g2000cwa.googlegroups.com...
> Hi,
>
> I'm looking for some advice, i am trying to control an Ericsson T28
> mobile phone by using a PIC16F87X. I understand the how to talk to a
> mobile phone by using my COM port o...Re: Can anyone recommend a good AVR book...
linnix - 2006-09-27 13:57:00
> 2) Let's say I want to make a simple AA battery tester (0 to 1.5 VDC
> range), and interface it to the PC via serial port. I know I'll need
> an ADC, and I can probably get away with using the one on the chip
> (comparator, right?). Anyone have any schematic for building such an
> AV...Re: Difference between? MAX232 and DS275
2006-11-19 13:25:00
RsK ha escrito:
> Please tell me what is the main difference between MAX232 and DS275 and
> is there any disadvantage of using DS275 or advantages?
> regards,
It seems that the main advantage is its much lower power consumption
because its takes power from the input lines when these ar...Re: 4-8ch relay board ?
Neil - 2007-06-13 15:24:00
Jan Nielsen" wrote in message
news:466f5529$0$52150$edfadb0f@dread11.news.tele.dk...
> I know such products already exists, I just want to make one myself,
> partly for the price, and partly to learn.
> /Jan
If you want to climb up the learning curve, how about
- a PIC16F877 (partly be...Re: How do I programmatically send signals to USB?
Doug Miller - 2007-04-30 18:54:00
In article , John wrote:
> On 30 Apr 2007 12:09:09 -0700, unisonharmonics@gmail.com wrote:
> > How do I control voltages to pins of the USB programmatically?
> > For example, I'd like to say send a signal to individual USB pins (if
> > that's applicable in USB) how do I do that ?
> >
>...Simple circuit to measure baud rate on a serial link
Simon - 2007-04-21 02:56:00
Hello -
I'd like to be able to measure the baud rate that a couple of sealed devices
are using to talk to each other over a serial (RS232) cable. I know that
they only use the common baud rates 9600, 19200, etc.
Can anybody give me some pointers on a circuit I could build that I could
daisy...Re: PICs and Vss/Vdd
ian field - 2007-11-11 12:05:00
"Anthony Fremont" wrote in message
news:13je3f6a0esuc5a@news.supernews.com...
> ian field wrote:
>
> > Why discourage him from voltage testing with a wet finger?!
>
> How are your PIC adventures going?
>
Still trawling through back issues of EPE, that's what I have the most
d...Re: design help
John Larkin - 2009-02-28 14:58:00
On Sat, 28 Feb 2009 18:44:23 GMT, Jan Panteltje
wrote:
> On a sunny day (Sat, 28 Feb 2009 09:55:21 -0800) it happened John Larkin
> wrote in
> :
>
> > I recently did...
> >
> > http://www.highlandtechnology.com/DSS/T346DS.html
> >
> > which has over 250 distinct serial ascii c...Re: Build USB Long Cable
Michael A. Terrell - 2007-05-27 17:37:00
Jamie wrote:
>
> mtczx232@yahoo.com wrote:
>
> > if I build by my self a USB cable by 4 seperate coaxial cable
> > together , it's can work over 5 meter?
> >
> if you have low capacitance how ever, I would make a buffer
> driver system to beef up the current.
> They use to...Re: RS422 flipping bits
john jardine - 2006-10-26 18:39:00
wrote in message
news:1161828314.411492.322270@b28g2000cwb.googlegroups.com...
> I suspect a device I have is flipping bits before it sends out RS422
> signals. I sent 3 capital A's out of it, and the oscilloscope trace is
> at:
>
> http://www.coolgroups.com/AAA.JPG
>
> I am usi...Re: ULN2803A (darlington array) anyone know what I'm doing wrong?
Don McKenzie - 2006-10-04 16:14:00
Ben wrote:
> I'd need 8 transistors, so a single chip that does the job seemed like a
> good idea.
Spot on Ben,
good work.
Don...
--
Don McKenzie
E-Mail Contact Page: http://www.dontronics.com/e-mail.html
Micro,TTL,USB to 1.5" color LCD http://www.dontronics.co...Re: Is it possible to multiply resistance?
Don McKenzie - 2006-08-25 16:03:00
randomname wrote:
> I know resistors in series simply add up... but is there any way to
> mulitply resistance?
>
> eg: can I take a 10k pot and make it work as if it were a 100k pot?
>
> Thanks,
> -sam
in a word, NO
Don...
--
Don McKenzie
E-Mail Contact Page: ...Re: high impedance capacitive cable, what is it [ Optically Isolated ? ]
=?ISO-8859-1?Q?Glenn_M=F8ller-Holst?= - 2008-10-07 22:44:00
Fibo wrote:
> hello, I heard somebody talking about a type of cable the other day
> and I can't find any information on it... does this make sense to
> anybody:
>
> I was doing a continuity check (aka ohming out, ringing out...etc etc)
> on a db15 cable with all the pins connected strai...Re: Joule Thief - still not working....
default - 2009-08-09 16:24:00
On Sun, 9 Aug 2009 07:01:28 -0700 (PDT), fungus
wrote:
> On Aug 9, 1:20 pm, default wrote:
> > >
> > $3 is too much?
> >
>
> Oh, I didn't see the prices for individual chips, only
> the ones with PCBs.
>
That's the beauty of them. Only need a solderless breadboard and
may...Re: programming PIC16F84
Byron A Jeff - 2006-09-08 11:08:00
In article ,
wrote:
> Hello,
> i m new to programming PIC microcontrollers.......recently i built the
> JDM multi pic programmer and tried to program showing "verify failed
> at address 0000h" what might be the problem?? plz help me.........
What voltages do you have at the PIC prog...Re: microprocessor circuits
Don McKenzie - 2006-10-28 15:28:00
venkatsr wrote:
> Hi ,I would like to do simple but interesting circuits using
> microprocessors
> Is it possible without a microprocessor trainer kit ?
http://www.dontronics.com/dt006.html
you can build your own version if this suits, as all the info is there,
and demo version basc...Re: Xtal vs. Resonator
Joerg - 2008-11-25 21:05:00
Randy Day wrote:
> In article 03.dc1.easynews.com> , zapwireDASHgroups@yahoo.com says...
> > "randy.day" wrote in message
> > news:HlGWk.338$j61.24@newsfe04.iad...
[...]
>
> > The pros of ceramic resonators is that they're cheaper... only less than half
> > the price of a q...Re: Simple PC Serial Port Help
Rich Grise - 2006-11-16 14:29:00
On Wed, 15 Nov 2006 18:42:07 -0800, Chris wrote:
> ozraven@gmail.com wrote:
...
> > That said, I am trying to find some information on building a very
> > simple circuit that combines a momentary contact switch and my PC's
> > serial port. I have a very basic understanding of electronics,
...PIC USART troubles
hybrid_snyper - 2007-03-03 13:27:00
Hello all,
Im in a bit of a desperate situation. I am trying to get my PIC 16f876
to talk to a Ericsson T28. The T28 has both TX/RX pins and I have
connected them directly to the TX/RX pins on my PIC. I measured the
voltage across the VDD and GND on the phone and I am running my PIC at
the sa...Re: Parking Sensors
default - 2007-12-25 11:26:00
On Mon, 24 Dec 2007 23:09:00 GMT, "Michael"
wrote:
> Hi,
>
> I'm looking at parking sensors and can't work out why there aren't lists of
> sites on Google telling you how to make homemade versions. Surely all you
> need is an array of ultrasonic sensors each one "pinged" in turn to avo...Re: Printer port confusion
John G - 2007-01-04 04:24:00
"Homer J Simpson" wrote in message
news:AkZmh.110640$rv4.82582@edtnps90...
>
> "Randy Day" wrote in message
> news:fCXmh.557172$R63.52863@pd7urf1no...
>
> > Is there a reason why different websites list different
> > signal states on some parallel port pins? Are some just
> >...