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2005-12-16 by John Samperi
At 03:28 PM 16/12/2005, you wrote: >I downloaded VBExpress (free license) but haven't used it. I assume >(incorrectly?) that if it's free from Micro$oft then it is really a >tease to buy VB2005 pro. It works very well on it's own. I have build the Message Station application with
2005-12-16 by stevech@san.rr.com
I downloaded VBExpress (free license) but haven't used it. I assume (incorrectly?) that if it's free from Micro$oft then it is really a tease to buy VB2005 pro. ----- Original Message ----- From: John Samperi Date: Thursday, December 15, 2005 10:41 pm Subject: Re: [AVR-Chat] (Was
2005-12-16 by John Samperi
Ahhh...isn't good that we finally no longer have AVR problems, Studio problems, JTAG, Programmers etc.. It does get a little boring doesn't it :-) Well if you have nothing to do and since it is Friday (Sydney time) you may want to try out my new Message Station software which has
2005-12-16 by Russell Shaw
Peter Jakacki wrote: > Ok, this is good, it's getting meaty and I like some of your figures. > This only takes into account a discrete BC548 and not the typical input > transistor of the receiver which also happens to be buffered by two > other transistors in typical inverter fol
2005-12-16 by stevech@san.rr.com
perhaps as many won't work with 0-5 as will. Depends on your requirements! ----- Original Message ----- From: Peter Gargano Date: Thursday, December 15, 2005 5:28 pm Subject: Re: [AVR-Chat] Re: PC COM Ports > But may receivers will work at a swing of 0 to 5 volts. > > stevech@san
2005-12-16 by Peter Jakacki
Ok, this is good, it's getting meaty and I like some of your figures. This only takes into account a discrete BC548 and not the typical input transistor of the receiver which also happens to be buffered by two other transistors in typical inverter follower fashion. Anyway, I enjo
2005-12-16 by Russell Shaw
Peter Jakacki wrote: > Russell Shaw wrote: > >>Peter Gargano wrote: >> >>>stevech@san.rr.com wrote: >>> >>>>*RS232C is such that if the voltage swings +/- 6V it is in compliance.* >> >> > But may receivers will work at a swing of 0 to 5 volts. >> >>Maybe, but what about max speed
2005-12-16 by David Kelly
On Dec 15, 2005, at 4:07 PM, stevech@san.rr.com wrote: > RS232C is such that if the voltage swings +/- 6V it is in compliance. No, 3 volts positive/negative is the minimum specification. Six volts provides one with a comfortable margin. In practice many receivers accept anything
2005-12-15 by Peter Jakacki
That was funny Russ, this may be more true of a mosfet's gate charge, not a bipolar which works quite a bit differently (minority carrier charge, electron holes, etc). Anyway, what speed are we talking about? 100Mhz? 10Mhz? 1Mhz? The speeds that RS-232 operate at can be handled e
2005-12-15 by Russell Shaw
Peter Gargano wrote: > stevech@san.rr.com wrote: > >>*RS232C is such that if the voltage swings +/- 6V it is in compliance.* > > But may receivers will work at a swing of 0 to 5 volts. > Maybe, but what about max speed reliability? Negative drive removes transistor base charge fa
2005-12-15 by Peter Gargano
But may receivers will work at a swing of 0 to 5 volts. stevech@san.rr.com wrote: > *RS232C is such that if the voltage swings +/- 6V it is in compliance.* Peter Gargano -- Tech Edge Pty. Ltd. http://techedge.com.au http://WBo2.com ph : (02) 6251 5519 Int'l : +612 6251 5519 Fax :
2005-12-15 by stevech@san.rr.com
RS232C is such that if the voltage swings +/- 6V it is in compliance. � � ----- Original Message ----- From: David Kelly Date: Thursday, December 15, 2005 3:20 pm Subject: Re: [AVR-Chat] Re: PC COM Ports > On Thu, Dec 15, 2005 at 10:34:00AM -0600, Thomas Keller wrote: > > John Sa
2005-12-15 by David Kelly
On Thu, Dec 15, 2005 at 10:34:00AM -0600, Thomas Keller wrote: > John Samperi wrote: > > > At 05:52 AM 15/12/2005, you wrote: > > >0/+3 happens to work on classic 1488/1489 buffers, "but its not right." > > > > > >Super serious workstations used to rigidly ahere to +-10 volts. >
2005-12-15 by Thomas Keller
John Samperi wrote: > At 05:52 AM 15/12/2005, you wrote: > >0/+3 happens to work on classic 1488/1489 buffers, "but its not right." > > > >Super serious workstations used to rigidly ahere to +-10 volts. > > > + - 25V being the 'right' voltage :-) Uhm...IIRC correctly, the RS-232C
2005-12-15 by Thomas Keller
Bruce Parham wrote: > Zack Widup wrote: > > > On Tue, 13 Dec 2005, sheena licarte wrote: > >>Mr. David and Mr. Zack thanks for the advice. i'll try to test things > >>one at a time. by the way is it possible to connect avr directly to > the > >>rs232 level converter such as max 2
2005-12-15 by Peter Jakacki
David Kelly wrote: > The specified range is 3 to 30, positive and negative, with -3 to +3 > being the "keep out zone". > > +-5 and +-12 used to be very common voltages to have inside a > computer as Once Upon A Time common DRAM memory required negative > voltage bias to operate.
2005-12-15 by David Kelly
On Dec 14, 2005, at 3:36 PM, John Samperi wrote: > At 05:52 AM 15/12/2005, you wrote: >> 0/+3 happens to work on classic 1488/1489 buffers, "but its not >> right." >> >> Super serious workstations used to rigidly ahere to +-10 volts. > > > + - 25V being the 'right' voltage :-) Th
2005-12-14 by Peter Harrison
John Samperi wrote: > At 05:52 AM 15/12/2005, you wrote: > >>0/+3 happens to work on classic 1488/1489 buffers, "but its not right." >> >>Super serious workstations used to rigidly ahere to +-10 volts. > > > > + - 25V being the 'right' voltage :-) > The RS232 Standard specifies s
2005-12-14 by John Samperi
At 05:52 AM 15/12/2005, you wrote: >0/+3 happens to work on classic 1488/1489 buffers, "but its not right." > >Super serious workstations used to rigidly ahere to +-10 volts. + - 25V being the 'right' voltage :-) Regards John Samperi **********************************************
2005-12-14 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, John Samperi wrote: > + - 25V being the 'right' voltage :-) I believe that the standard specifies the following: mark: -3 to -25 volts space: +3 to +25 volts The range between -3 and +3 is indeterminate. Don http://www.zbasic.net
2005-12-14 by David Kelly
On Wed, Dec 14, 2005 at 06:02:05PM -0000, Don Kinzer wrote: > --- In AVR-Chat@yahoogroups.com, Bruce Parham wrote: > > ... switching thresholds at +/- 6v. > > I have been able to send serial data to many different PCs using TTL > outputs (mark=0V, space=+5V, nominally). No proble
2005-12-14 by Jim Wagner
There have been limited discussions on AVRFreaks: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=34050 Jim On Wed, 14 Dec 2005 17:01:02 -0000 "mihai_hagianu" wrote: > > > hi everybody, > > is there any community effort into reverse engineering > the debugWire >
2005-12-14 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, Bruce Parham wrote: > ... switching thresholds at +/- 6v. I have been able to send serial data to many different PCs using TTL outputs (mark=0V, space=+5V, nominally). No problems yet. Don ZBasic Microcontrollers http://www.zbasic.net
2005-12-14 by Jim Wagner
I've gone a couple of meters and have not tried more. This issue is really the logic 0->1 transition. This is because the transistors are open-drain and use an external pullup resistor. Pull-down is fast because the transistor sinks a lot of current. Pull-up is with a fairly "wim
2005-12-14 by Ralph Hilton
On Wed, 14 Dec 2005 07:42:58 -0800 you wrote: >Zack Widup wrote: > >> On Tue, 13 Dec 2005, sheena licarte wrote: >> >> >>>Mr. David and Mr. Zack thanks for the advice. i'll try to test things >>>one at a time. by the way is it possible to connect avr directly to the >>>rs232 leve
2005-12-14 by mihai_hagianu
hi everybody, is there any community effort into reverse engineering the debugWire protocol already started ? as atmel is not releasing this protocol, i guess this is the only way one could implement tools for debugging AVR targets under diffrent platforms (linux for example) I w
2005-12-14 by Bruce Parham
Zack Widup wrote: > On Tue, 13 Dec 2005, sheena licarte wrote: > > >>Mr. David and Mr. Zack thanks for the advice. i'll try to test things >>one at a time. by the way is it possible to connect avr directly to the >>rs232 level converter such as max 232 and then to pc? >> > > > Ye
2005-12-14 by Ralph Hilton
On Tue, 13 Dec 2005 23:11:14 -0600 (CST) you wrote: >On Tue, 13 Dec 2005, sheena licarte wrote: > >> Mr. David and Mr. Zack thanks for the advice. i'll try to test things >> one at a time. by the way is it possible to connect avr directly to the >> rs232 level converter such as m
2005-12-14 by Zack Widup
On Tue, 13 Dec 2005, sheena licarte wrote: > Mr. David and Mr. Zack thanks for the advice. i'll try to test things > one at a time. by the way is it possible to connect avr directly to the > rs232 level converter such as max 232 and then to pc? > Yes, the MAX232 series all have T
2005-12-14 by sheena licarte
Mr. David and Mr. Zack thanks for the advice. i'll try to test things one at a time. by the way is it possible to connect avr directly to the rs232 level converter such as max 232 and then to pc? David Kelly wrote: On Mon, Dec 12, 2005 at 10:00:43AM -0600, Zack Widup wrote: > OK,
2005-12-14 by James Washer
I've read that 3 or 4 meters is fine for TWI at all but the fastest bit rates... Is that what you all have found? How far have you gone at various bit rates? - jim
2005-12-13 by Svenn Dahlstrøm
There is a chance the CPU is running from the internal clock all the time. Check the fuse settings... Svenn :) Hai I am using Atmega 16 with external clock It works fine with this .I found that the microcontroller is running even when there is no external clock Please advice abou
2005-12-12 by John Samperi
At 06:30 AM 13/12/2005, you wrote: >What would you recommend then if you wanted the accuracy of a normal >digital watch? Strap you PCB to your wrist :-) that way the crystal would be at a steady temperature and would not drift very much. Regards John Samperi *********************
2005-12-12 by Ralph Hilton
On Tue, 13 Dec 2005 06:47:27 +1100 you wrote: >How accurate are devices like the DS1302Z? About a minute a month. >>>> >>>>I'm trying to get a RTC going on a Mega 8 using a 32 kc watch crystal >>>>as per Atmel app note AVR134. >>>> >>>>The code works well except that the time gai
2005-12-12 by Ralph Hilton
On Tue, 13 Dec 2005 06:30:29 +1100 you wrote: >What would you recommend then if you wanted the accuracy of a normal >digital watch? A standard 32KHz xtal with CKOPT set should be fine. I've used one with an AVR without problems in the async timer of a mega32. I'd guess the proble
2005-12-12 by MuRaT KaRaDeNiZ
check the datasheet, it does the same (compansation tricks). Regards Murat Karadeniz http://www.onlinefavbar.com/mukas -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Chad O'Neill Sent: Monday, December 12, 2005 9:47 PM To:
2005-12-12 by Chad O'Neill
How accurate are devices like the DS1302Z? Chad MuRaT KaRaDeNiZ wrote: Well, you can try using a temperature measuring device in a pulsed manner and compansate for the thermal deviations and other offsets in software, connect atmega device to pc, use online atomic time servers to
2005-12-12 by MuRaT KaRaDeNiZ
Well, you can try using a temperature measuring device in a pulsed manner and compansate for the thermal deviations and other offsets in software, connect atmega device to pc, use online atomic time servers to get accurate reference clock. can be a nice challange :) Regards Murat
2005-12-12 by Chad O'Neill
What would you recommend then if you wanted the accuracy of a normal digital watch? Chad O'Neill Ralph Hilton wrote: On Mon, 12 Dec 2005 15:12:52 +1030 you wrote: Hi All, I'm trying to get a RTC going on a Mega 8 using a 32 kc watch crystal as per Atmel app note AVR134. The code
2005-12-12 by David Kelly
On Mon, Dec 12, 2005 at 10:00:43AM -0600, Zack Widup wrote: > OK, thanks. Is there any way you can hook up the mega16 directly to the > computer with an RS-232 level converter or some such? > > On Mon, 12 Dec 2005, spotwl8 wrote: > > > hello thanks for the reply! yes I'm using an
2005-12-12 by Zack Widup
OK, thanks. Is there any way you can hook up the mega16 directly to the computer with an RS-232 level converter or some such? I don't write programs in C at this point, I do them all in assmebler. But I like to do them in stages to verify each part is working. For instance, I wro
2005-12-12 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "aswinefy2003" wrote: > Hai > I am using Atmega 16 with external clock It works fine with this .I > found that the microcontroller is running even when there is no > external clock Please advice about this Unless you have modified the fuses, the c
2005-12-12 by Zack Widup
On Mon, 12 Dec 2005, Robert Payne wrote: > Hi All, > > I'm trying to get a RTC going on a Mega 8 using a 32 kc watch crystal > as per Atmel app note AVR134. > > The code works well except that the time gains about 3 seconds per hour. > > The crystal is a surplus watch crystal tha
2005-12-12 by Zack Widup
First off, I'm not sure about your configuration. When you say the transmitter is connected to the computer's serial port and the receiver is connected to the AVR, what kind of transmitter and receiver are you using? Do you mean RF transmitter and receiver? What frequency? Have y
2005-12-12 by spotwl8
hello thanks for the reply! yes I'm using an RF transceiver operates at 433MHz specifically BIM2 of radiometrix. I verified it already and its working.. I just used com port toolkit for sending data from pc. also yes I make sure that baud rate/parity/ stopbits are the same. --- I
2005-12-12 by spotwl8
hello thanks for the reply! yes I'm using an RF transceiver operates at 433MHz specifically BIM2 of radiometrix. I verified it already and its working.. I just used com port toolkit for sending data from pc. also yes I make sure that baud rate/parity/ stopbits are the same. --- I
2005-12-12 by spotwl8
hello thanks for the reply! yes I'm using an RF transceiver operates at 433MHz specifically BIM2 of radiometrix. I verified it already and its working.. I just used com port toolkit for sending data from pc. also yes I make sure that baud rate/parity/ stopbits are the same. --- I
2005-12-12 by Ralph Hilton
On Mon, 12 Dec 2005 15:12:52 +1030 you wrote: >Hi All, > >I'm trying to get a RTC going on a Mega 8 using a 32 kc watch crystal >as per Atmel app note AVR134. > >The code works well except that the time gains about 3 seconds per hour. > >The crystal is a surplus watch crystal tha
2005-12-12 by aswinefy2003
Hai I am using Atmega 16 with external clock It works fine with this .I found that the microcontroller is running even when there is no external clock Please advice about this
2005-12-12 by Robert Payne
Hi All, I'm trying to get a RTC going on a Mega 8 using a 32 kc watch crystal as per Atmel app note AVR134. The code works well except that the time gains about 3 seconds per hour. The crystal is a surplus watch crystal that I had and I have no idea of the capacitance load that i