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2004-11-04 by David Jones
>>> heavenly_arnold@yahoo.com.sg 04/11/2004 3:58:01 pm >>> >Dear All, >I am about to make a small project using the features in AT89E51( in system programmable microcontroller ). My ideas are : >1. to record incoming phone call ( answering machine ) by feeding the analog audio ou
2004-11-04 by Mansur Mansur
Dear All, I am about to make a small project using the features in AT89E51( in system programmable microcontroller ). My ideas are : 1. to record incoming phone call ( answering machine ) by feeding the analog audio output from a telephone to an ADC 2. Storage media will be a HDD
2004-11-03 by David Jones
>>> yahoo@barello.net 04/11/2004 1:52:09 am >>> >Please re-read my original post on this subject. I never claimed that the >tiny26 band-gap had high accuracy. I claimed it had high stability. Those >are two very different parameters. Almost any zener, let alone one designed as a
2004-11-03 by Dave VanHorn
> In Dave VanHorn's case, even the full temp >range drift would be acceptable for his battery charger, had he calibrated >each unit. This is what I wanted to avoid. >I would like to see an Atmel data sheet characterizing the band-gap >reference, however, Before committing any des
2004-11-03 by Larry Barello
Please re-read my original post on this subject. I never claimed that the tiny26 band-gap had high accuracy. I claimed it had high stability. Those are two very different parameters. Recently, somewhere that I cannot seem to put my finger on..., someone actually measured the drif
2004-11-03 by Dave VanHorn
At 10:48 PM 11/2/2004, David Jones wrote: > >>> yahoo@barello.net 03/11/2004 2:28:15 pm >>> > >Ok, I checked the data sheet. I couldn't find anything regarding the > >bandgap reference on the tiny26. Where is it? > >It's under "Electrical Characteristics" - "ADC Characteristics"
2004-11-03 by Dave VanHorn
At 10:28 PM 11/2/2004, Larry Barello wrote: >Ok, I checked the data sheet. I couldn't find anything regarding the >bandgap reference on the tiny26. Where is it? There is very little info, and on the sheets I have, no tolerance data. Unfortunately, the silicon processes that make
2004-11-03 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, Robert Adsett wrote: > At 02:16 PM 11/3/04 +1100, you wrote: > > > >>> dave_mucha@y... 03/11/2004 1:48:24 pm >>> > > >I figured the 4.096v was to generate an exact integer for a 12 bit > > >ADC. > > > >Yep. It'll do the same for any number of bits
2004-11-03 by Zack Widup
I looked and found several devices from Digi-Key that are 4.096 volt band-gap references. These are much more stable and accurate than a zener. Some are 5-pin SMD devices and a couple are 8-pin devices. But you basically put 5 to 15 volts on one pin and get 4.096 volts out of ano
2004-11-03 by Robert Adsett
At 02:16 PM 11/3/04 +1100, you wrote: > >>> dave_mucha@yahoo.com 03/11/2004 1:48:24 pm >>> > >I figured the 4.096v was to generate an exact integer for a 12 bit > >ADC. > >Yep. It'll do the same for any number of bits actually. > > >Guess that means a 0-5 requires a voltge divide
2004-11-03 by David Jones
>>> yahoo@barello.net 03/11/2004 2:28:15 pm >>> >Ok, I checked the data sheet. I couldn't find anything regarding the >bandgap reference on the tiny26. Where is it? It's under "Electrical Characteristics" - "ADC Characteristics" - "Vint - Internal Voltage Reference" It shows 2.3V
2004-11-03 by Larry Barello
Ok, I checked the data sheet. I couldn't find anything regarding the bandgap reference on the tiny26. Where is it? -----Original Message----- From: David Jones [mailto:david.jones@sercel.com.au] Sent: Tuesday, November 02, 2004 5:36 PM To: AVR-Chat@yahoogroups.com Subject: RE: [A
2004-11-03 by David Jones
>>> dave_mucha@yahoo.com 03/11/2004 1:48:24 pm >>> >I figured the 4.096v was to generate an exact integer for a 12 bit >ADC. Yep. It'll do the same for any number of bits actually. >Guess that means a 0-5 requires a voltge divider to get to the 4.096 >value at 5 volts. Yes, altho
2004-11-03 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, "David Jones" wrote: > >>> dave_mucha@y... 03/11/2004 12:20:07 pm >>> > --- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > > > > > > > >any suggestions on what to use for an external ref ? > > > > Any convenient band-gap chip will work. In my
2004-11-03 by David Jones
>>> dave_mucha@yahoo.com 03/11/2004 12:20:07 pm >>> --- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > > > > >any suggestions on what to use for an external ref ? > > Any convenient band-gap chip will work. In my case, I used the 4.096V version. >Can you offer any type of lin
2004-11-03 by Dave VanHorn
> >Can you offer any type of link to how to use one ? Think of it as a high accuracy zener diode with good knees. You feed a small current at it, and it limits the voltage to 4.096V >I down loaded the TI data sheet for an LM-385, 3 pin TO-92 package >unit and the unit is shown as
2004-11-03 by David Jones
>>> yahoo@barello.net 03/11/2004 12:27:39 pm >>> >I believe the bandgap reference in the tiny26 is plenty stable, but >uncalibrated. In a production environment it might be cheaper to calibrate >the unit rather than paying for a high accuracy external trimmed unit. Nope, check th
2004-11-03 by Larry Barello
I believe the bandgap reference in the tiny26 is plenty stable, but uncalibrated. In a production environment it might be cheaper to calibrate the unit rather than paying for a high accuracy external trimmed unit. -----Original Message----- From: Dave VanHorn On the tiny-26, I go
2004-11-03 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > > > > >any suggestions on what to use for an external ref ? > > Any convenient band-gap chip will work. In my case, I used the 4.096V version. I hate to sound like a dummy, but sometimes the truth cannot be hidden. Can you of
2004-11-02 by David Jones
>>> svenn@symetrics.no 02/11/2004 8:02:40 pm >>> >Hi Andrew >One way to get a good accuracy is to do a calibration. Only really works at one temperature, depending on the thermal response of your reference. You could of course calibrate over the entire temperature span, but youd
2004-11-02 by Dave VanHorn
> >any suggestions on what to use for an external ref ? Any convenient band-gap chip will work. In my case, I used the 4.096V version. >I used a TI chip, the TLS2543, 11 channel 12 bit ADC chip and also >found that unless the actual Vcc was corrected for, there were errors. > >Th
2004-11-02 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > At 09:53 AM 11/2/2004, Larry Barello wrote: > > >Place a capacitor between Aref and ground (the analog ground). > > > >The accuracy of the conversion is better than .5%, but depending upon your > >VCC accuracy, your absolute
2004-11-02 by Dave VanHorn
At 09:53 AM 11/2/2004, Larry Barello wrote: >Place a capacitor between Aref and ground (the analog ground). > >The accuracy of the conversion is better than .5%, but depending upon your >VCC accuracy, your absolute accuracy won't be so good. At room >temperature most +5v regulato
2004-11-02 by Larry Barello
Place a capacitor between Aref and ground (the analog ground). The accuracy of the conversion is better than .5%, but depending upon your VCC accuracy, your absolute accuracy won't be so good. At room temperature most +5v regulators are pretty good, but you definitely won't get t
2004-11-02 by Svenn Dahlstrøm
Hi Andrew One way to get a good accuracy is to do a calibration. Svenn :-) ----- Original Message ----- From: Andrew Lim To: AVR-Chat@yahoogroups.com Sent: Tuesday, November 02, 2004 6:49 AM Subject: [AVR-Chat] ADC accuracy in ATmega8535 Hi there, I'm using ADC interrupt mode in
2004-11-02 by David Jones
>>> normaxcite@yahoo.com 02/11/2004 4:49:43 pm >>> >Hi there, >I'm using ADC interrupt mode in my prototype board. Everything is running now but I'm facing accuracy problem. Can someone help >me? I need my accuracy to be +/- 0.5%. You won't get 0.5% accuracy using the internal re
2004-11-02 by Andrew Lim
Hi there, I'm using ADC interrupt mode in my prototype board. Everything is running now but I'm facing accuracy problem. Can someone help me? I need my accuracy to be +/- 0.5%. 1. I have my AVCC connected to Vcc. 2. Aref not connected. 3.Set free running mode 4.REFS1 = 0 , REFS0
2004-11-01 by Zack Widup
Is that part still being manufactured? I'm not familiar with it. Is it an SMD device? I usually don't try to re-use those. I've been using EPM3064 devices (MAX3000 series) new They are relatively cheap. Zack On Mon, 1 Nov 2004, rastoboy wrote: > > Greetings, > > I'm presently wor
2004-11-01 by Jeffrey Engel
Alex, Many thanks for your help. I did download AVRdude - the Win32 version comes as a binary, so I didn't have to concern myself with compiling it. I found that my failures came from several bad components, including a possible bad 2343. Look forward to more Newby questions in t
2004-11-01 by rastoboy
--- In AVR-Chat@yahoogroups.com, Zack Widup wrote: > Is that part still being manufactured? I'm not familiar with it. > > Is it an SMD device? I usually don't try to re-use those. I've been > using EPM3064 devices (MAX3000 series) new They are relatively cheap. > > Zack > > On Mo
2004-11-01 by rastoboy
Greetings, I'm presently working on a project using an ATMega32 with a MAX7128S Altera CPLD. Problem is...the Altera PLD's have their JTAG disabled, so I cannot program them (I got them as board pulls, used). I understand to re-enable this, the parts need to be cleared in a devic
2004-11-01 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Tzif" wrote: > Try to use the STK200 Dongle ... But, the STK200 only supports a few "classic" and Tiny AVRs, no? If we want to suggest alternatives to ISP, we need to know which AVR the newby (newbie?) is using. Graham.
2004-10-31 by Chuck Hackett
> From: Reza > > --- Chuck Hackett wrote: > > > Can anyone tell me what files and/or parameters to change to generate > > .coff files for AVR Studio 4 when compiling Ethernut so that I can > > step through OS/Net code? > .... > > if you are using WinAVR 3.4 there is an extended c
2004-10-31 by Reza
--- Chuck Hackett wrote: > Can anyone tell me what files and/or parameters to > change to generate .coff > files for AVR Studio 4 when compiling Ethernut so > that I can step through OS/Net > code? > > Cheers, > > Chuck Hackett > "Good judgment comes from experience, experience >
2004-10-31 by Chuck Hackett
Thanks to all for the input on my long distance bus. It's been a great help. Hopefully I can get up to speed on the AVR to be able to contribute something in return in the future. Cheers, Chuck Hackett "Good judgment comes from experience, experience comes from bad judgment" 7.5"
2004-10-31 by Chuck Hackett
Can anyone tell me what files and/or parameters to change to generate .coff files for AVR Studio 4 when compiling Ethernut so that I can step through OS/Net code? Cheers, Chuck Hackett "Good judgment comes from experience, experience comes from bad judgment" 7.5" gauge Union Paci
2004-10-31 by Robert Adsett
At 12:40 PM 10/31/04 -0600, you wrote: > > From: rajesh parwani > > > > i would suggest u for i2c bus or rs232 intrerface using rxd > > and txd pins. > > although with suggested scheme ur some of the wires will be > > left out , u can use them for future development > >I know RS-
2004-10-31 by Chuck Hackett
> From: rajesh parwani > > i would suggest u for i2c bus or rs232 intrerface using rxd > and txd pins. > although with suggested scheme ur some of the wires will be > left out , u can use them for future development I know RS-232 won't go the required 400 feet and I haven't seen
2004-10-31 by Zack Widup
Hi, I've had much experience with all sorts of microcontrollers, including the Z80, 8085, 8051, 6800, PIC's, etc., and now the AVR's. But there is always something new to learn and now I've got a new project with something I have no experience in. This is it - What communication
2004-10-31 by rajesh parwani
i would suggest u for i2c bus or rs232 intrerface using rxd and txd pins. although with suggested scheme ur some of the wires will be left out , u can use them for future development Reza wrote: --- Chuck Hackett wrote: > I would like to transfer data some distance (100 > feet in
2004-10-31 by Mike F. Schwarzer
Hello, > MuRaT KaRaDeNiZ schrieb: > Maxim has reduced slew rate rs485 transceivers > which work up to 250kbit/sec I think, and > reflections or EMI are greatly reduced in that way. > Primitive transceivers like 75176 have instead high > slew rates for being capable of transceivin
2004-10-31 by MuRaT KaRaDeNiZ
Maxim has reduced slew rate rs485 transceivers which work up to 250kbit/sec I think, and reflections or EMI are greatly reduced in that way. Primitive transceivers like 75176 have instead high slew rates for being capable of transceiving 10mbit/sec for short distances. Choosing I
2004-10-31 by Leon Heller
----- Original Message ----- From: Dave Lag To: AVR-Chat@yahoogroups.com Sent: Sunday, October 31, 2004 4:02 AM Subject: [AVR-Chat] AVR ISP and TINY11? I think these two dislike each other or at least are not on speaking terms, Is this correct? Yes, you need to use high-voltage p
2004-10-31 by Tzif
Hi Alex I had the same problems my self I built the ISP board in order to load the software to the prototype board that I built and couldn't do it right until I used the AVRDUDE software Try it ......It is simple and works. My suggestion for you is not to spend a lot of time as I
2004-10-31 by Dave Lag
I think these two dislike each other or at least are not on speaking terms, Is this correct? D
2004-10-31 by Alex Shepherd
> I think I'll head on down to work and see what I can > do with XP. Then maybe install the WinAVR package. http://winavr.sourceforge.net/ It comes with the AvrDude programmer and should install cleanly. Alex
2004-10-31 by Jeffrey Engel
Alex, Thanks, but my Linux installation is missing 'texi2html' and the make errors out. It seemed too involved for the time being. I think I'll head on down to work and see what I can do with XP. Thanks! Jeff Engel --- Alex Shepherd wrote: > > > The software is Mandrake Linux and
2004-10-31 by Alex Shepherd
> The software is Mandrake Linux and PonyProg. I've > tried both the serial and parallel dongles and can't > seem to get them to communicate with the prototyping > board. > > Any pointers? You could try the AvrDude programming software. I think it compiles under Linux. http://sav
2004-10-31 by Jeffrey Engel
Folks, I'm just getting started with AVRs and have a couple of prototype boards and ICSP programmer dongles from Olimex. The software is Mandrake Linux and PonyProg. I've tried both the serial and parallel dongles and can't seem to get them to communicate with the prototyping boa
2004-10-30 by Alex Shepherd
> Is it possible to use Modbus + Avr? > Does anyone have some info or links about it? Yes do a Google search for "modbus serial AVR" and you will get several Notable ones are: http://www.modbus.org/default.htm http://www.mcselec.com/modbus.htm http://homepage.sunrise.ch/homepage/