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2004-07-31 by C Sizer
Thanks Ken, In the series/parallel combination I was looking at I will be looking at about 2.2 - 2.3V then, that means around 4A being drawn from each series combination - yikes!!!!! Cheers Col --- In AVR-Chat@yahoogroups.com, Ken Holt wrote: > > 4 NiMH batteries is a good starti
2004-07-31 by C Sizer
--- In AVR-Chat@yahoogroups.com, "Graham Davies" wrote: > --- In AVR-Chat@yahoogroups.com, "C Sizer" wrote: > > > ... I want to use 4 x 2300mAh AA > > batteries in serial/parallel to > > provide me with 3V. > > Sounds like alkaline cells at 1.5 volts each. > > > The printer runs
2004-07-31 by C Sizer
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: > At 09:16 AM 7/30/2004, C Sizer wrote: > > >Hi guys, > > > >I am designing a university project, a hand-held printer using the > >AVR and a small thermal printer. For portability I want to use 4 x > >2300mAh AA batteries in s
2004-07-31 by C Sizer
Hi Cobb, I probably didn't explain myself too well, plus my typo where I said I wanted 3V from the converter, I really meant 5V. I have 4 batteries (this is the maximum room I have in my case). The printer runs from 5V and consumes 3.5A peak. The idea was to connect 2 pairs in se
2004-07-31 by gary_hobson2003
HI! My problem with adc is that it does not take samples as I want.I give a 40HZ sine to differential input of it but the more I increse the frequency the more periods I get and the resoloution does not change.In the following result of adc data samples I have 32 samples for a 40
2004-07-31 by David VanHorn
At 08:07 PM 7/30/2004, Mike Murphree wrote: >On Jul 30, 2004, at 1:17 PM, Graham Davies wrote: > >> --- In AVR-Chat@yahoogroups.com, "C Sizer" wrote: >> >>> ... I want to use 4 x 2300mAh AA >>> batteries in serial/parallel to >>> provide me with 3V. >> >> Sounds like alkaline cel
2004-07-31 by Mike Murphree
On Jul 30, 2004, at 1:17 PM, Graham Davies wrote: > --- In AVR-Chat@yahoogroups.com, "C Sizer" wrote: > >> ... I want to use 4 x 2300mAh AA >> batteries in serial/parallel to >> provide me with 3V. > > Sounds like alkaline cells at 1.5 volts each. He needs a supply voltage of 3V,
2004-07-30 by David VanHorn
At 02:17 PM 7/30/2004, Ken Holt wrote: >4 NiMH batteries is a good starting point, but remember that you'll >only get 4.4 - 4.6V (series total) over most of the discharge curve. Actually, they are dead, for this app, at 1V/Cell, so 4V. An additional cell wouldn't be a bad idea, i
2004-07-30 by Ken Holt
4 NiMH batteries is a good starting point, but remember that you'll only get 4.4 - 4.6V (series total) over most of the discharge curve. At 06:17 PM 7/30/2004 -0000, you wrote: >--- In AVR-Chat@yahoogroups.com, "C Sizer" wrote: > >> ... I want to use 4 x 2300mAh AA >> batteries i
2004-07-30 by Dave Mucha
I have been trying to find some AT25F1024N memory chips and it seems that the major suppliers don't carry them. Since there are only 2 versions of the 1024 chip I was really surprized. Does anyone know why Atmel chips are not stocked ? I'd guess that they don't move as fast or ar
2004-07-30 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "C Sizer" wrote: > ... I want to use 4 x 2300mAh AA > batteries in serial/parallel to > provide me with 3V. Sounds like alkaline cells at 1.5 volts each. > The printer runs on 5V but consumes > over 3.5A peak, so I require a DC- > DC converter cir
2004-07-30 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Dave Mucha" wrote: > OK, so if you wanted to monitor > an analog value, an external ADC > would be best if the speed of > the samples were high. If you need a sample rate higher than the AVR can provide, the only way is to use an external convert
2004-07-30 by David VanHorn
> >as for the successive approximation, would the accuracy be higher if >the process were relatively steady and the change between readings >were rather small ? Depends.. I used the M8 and M128 ADCs in a thermal printer, and I needed samples taken at a specific time, about 100uS
2004-07-30 by David VanHorn
At 09:16 AM 7/30/2004, C Sizer wrote: >Hi guys, > >I am designing a university project, a hand-held printer using the >AVR and a small thermal printer. For portability I want to use 4 x >2300mAh AA batteries in serial/parallel to provide me with 3V. Shuttle or line mech? Line is
2004-07-30 by Cobb, Quentin
I don't get it. You have four AA batteries, so you have 5v if you run them in series. You want 5v to run the printer. Why do you need to convert anything? -----Original Message----- From: C Sizer [mailto:aussiecol39@yahoo.com] Sent: July 30, 2004 8:17 AM To: AVR-Chat@yahoogroups.
2004-07-30 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, "Graham Davies" wrote: > --- In AVR-Chat@yahoogroups.com, "Alexandre Guimaraes" > wrote: > > > > > Yes, it is successive approximation, at something like 200 kHz. > > > You can go up to 1MHz if you only need 8 bit precision. > > That makes it even
2004-07-30 by C Sizer
Hi guys, I am designing a university project, a hand-held printer using the AVR and a small thermal printer. For portability I want to use 4 x 2300mAh AA batteries in serial/parallel to provide me with 3V. The printer runs on 5V but consumes over 3.5A peak, so I require a DC- DC
2004-07-29 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Alexandre Guimaraes" wrote: > > > Yes, it is successive approximation, at something like 200 kHz. > > You can go up to 1MHz if you only need 8 bit precision. > That makes it even more interesting.... Just to clarify for anyone not reading the dat
2004-07-29 by David VanHorn
> >> That makes it even more interesting.... Have you used it at that speed >> and got real 8 bit's precision ??? > > Yes, not a problem. As stated in the datasheet. Well.. They say you can go faster if you don't need 10 bit accuracy, but they never give any guidance on how fast
2004-07-29 by Mark Jordan
On 29 Jul 2004 at 10:48, Alexandre Guimaraes wrote: > Could you post the schematic and program snippet that you used ? When I > tried to use the ADC it seemed to be very bad. I probably made something > quite wrong but did not have the time and incentive ($$) to find out what it
2004-07-29 by David VanHorn
> > Could you post the schematic and program snippet that you used ? When I >tried to use the ADC it seemed to be very bad. I probably made something >quite wrong but did not have the time and incentive ($$) to find out what it >was... There are some timings to be observed, for w
2004-07-29 by Alexandre Guimaraes
Hi, Mark > > You need to connect AVCC (always!), you need to supply an external > > reference, or use VCC for ratiometric measurements (the internal reference > > is pretty dodgy), you need to supply a cap on the ref pin. > > Does the same apply to the ATMEGA8 ADC? I have used th
2004-07-29 by David VanHorn
At 08:39 AM 7/29/2004, Mark Jordan wrote: >On 29 Jul 2004 at 8:15, David VanHorn wrote: > >> You need to connect AVCC (always!), you need to supply an external >> reference, or use VCC for ratiometric measurements (the internal reference >> is pretty dodgy), you need to supply a
2004-07-29 by Mark Jordan
On 29 Jul 2004 at 8:15, David VanHorn wrote: > You need to connect AVCC (always!), you need to supply an external > reference, or use VCC for ratiometric measurements (the internal reference > is pretty dodgy), you need to supply a cap on the ref pin. Does the same apply to the A
2004-07-29 by Dave Mucha
> You need to connect AVCC (always!), you need to supply an external reference, or use VCC for ratiometric measurements (the internal reference is pretty dodgy), This part is typical for internal or external ADC's. the ADC value is referenced to the power supply or to another val
2004-07-29 by David VanHorn
At 04:05 AM 7/29/2004, Astria Nur Irfansyah wrote: >Hi, my friend wants to use the ADC of an AT90s8535, but >she is not sure how. i never had any experience using >AVR's ADC. My friend told me that there is still some >external circuit to be made. Is this true? What is the >purpo
2004-07-29 by Astria Nur Irfansyah
Hi, my friend wants to use the ADC of an AT90s8535, but she is not sure how. i never had any experience using AVR's ADC. My friend told me that there is still some external circuit to be made. Is this true? What is the purpose of this external circuitry? And what are the limitati
2004-07-29 by David VanHorn
At 09:12 PM 7/28/2004, Rodrigo Feher wrote: >On Tue, 27 Jul 2004, David VanHorn wrote: > >> The BA1FB programmer is very nice, I use it a lot. >> Other than that, it's an AVRISP, or STK-500 > >Can STK500 program ATTiny11? Out of circuit only, the T11 is high voltage only.
2004-07-29 by Rodrigo Feher
On Tue, 27 Jul 2004, David VanHorn wrote: > The BA1FB programmer is very nice, I use it a lot. > Other than that, it's an AVRISP, or STK-500 Can STK500 program ATTiny11? Rodrigo
2004-07-28 by David VanHorn
> >What I was trying to say is that if I write a program in Basic for >the AT90, will it able to be easily be ported over to the tiny or >mega without much re-programming ? Yes. Easier than any other large family of processors I've worked with. Atmel brought out the AT90 series f
2004-07-28 by David VanHorn
> >Well, a lot of places, actually. Articles on the Web (such as the one >mentioned in this thread), in technical magazines and presentations >by vendors. I've also directly observed the difference in processors >I've worked with. So my tiny-11 is CISC, because it can operate dir
2004-07-28 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: > > > > >What I was trying to say is that if I write a program in Basic for > >the AT90, will it able to be easily be ported over to the tiny or > >mega without much re-programming ? > > Yes. Easier than any other large family
2004-07-28 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: > > > > >Will the code writen for the AT90 be almost the same as the code for > >the AVR ? Is my using an assembled boards based on the AT90S2313 a > >good idea ? or should I be more interested in using AVR devices ? > > The A
2004-07-28 by Graham Davies
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: > At 08:49 AM 7/28/2004, Graham Davies wrote: > Where did you get that idea? [that CISC > and RISC are distinguished by the ability > and iniability to operate directly on > memory]. Well, a lot of places, actually. Articles o
2004-07-28 by David VanHorn
> >Will the code writen for the AT90 be almost the same as the code for >the AVR ? Is my using an assembled boards based on the AT90S2313 a >good idea ? or should I be more interested in using AVR devices ? The AT90 is an AVR. The 2313 is a lower end AVR, but capable. My favorite
2004-07-28 by jay marante
aren't the AT90 chips the early AVR? like the AT90S8515. Dave Mucha wrote: > > > >> ... AVRs instruction set > >> is not so reduced ... > > > >These days, what distinguishes RISC and CISC is not so much the size > >of the instruction set but whether you can perform operations > >
2004-07-28 by jay marante
i agree with Mr Davies. a RISC computer involves register-to-register operation while a CISC involves lots of memory access. that is why the AVR has 32 registers in its register file since a RISC computer requires atleast 32 registers. the CISC however involves memory access. tha
2004-07-28 by David VanHorn
> >There's a very good article here: > >http://arstechnica.com/cpu/4q99/risc-cisc/rvc-1.html This also illustrates the huge gap between the microcontroller world, and the intel/AMD pc processor world.
2004-07-28 by David VanHorn
At 08:49 AM 7/28/2004, Graham Davies wrote: >--- In AVR-Chat@yahoogroups.com, "Astria Nur Irfansyah" > wrote: > >> ... AVRs instruction set >> is not so reduced ... > >These days, what distinguishes RISC and CISC is not so much the size >of the instruction set but whether you can
2004-07-28 by Dave Mucha
> > > >> ... AVRs instruction set > >> is not so reduced ... > > > >These days, what distinguishes RISC and CISC is not so much the size > >of the instruction set but whether you can perform operations > >directly on memory. In the AVR, you have to load data from memory to > >a r
2004-07-28 by Jeremy Brandon
--- In AVR-Chat@yahoogroups.com, David VanHorn wrote: >> These days, what distinguishes RISC and CISC is not so much the >> size of the instruction set but whether you can perform operations >> directly on memory. In the AVR, you have to load data from memory >> to a register, op
2004-07-28 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Astria Nur Irfansyah" wrote: > ... AVRs instruction set > is not so reduced ... These days, what distinguishes RISC and CISC is not so much the size of the instruction set but whether you can perform operations directly on memory. In the AVR, you
2004-07-28 by Sal Brisindi
--- In AVR-Chat@yahoogroups.com, "Dave Mucha" wrote: > --- In AVR-Chat@yahoogroups.com, "Sal Brisindi" > wrote: > > Hi Dave, > > Checkout http://www.futurlec.com/ATDevBoard.shtml > > I bought my AT90S2313 developement board from them for $19.90 which > > will allow you to connect
2004-07-28 by Adrian
Dave, > As it is now, I am just getting started and an not > looking for the > most universal, but the best cheap unit, even if it > limits my chip > selections. I'm a newcomer to this device and have been there and got started OK. A good intro seems to be a PC parallel plug to I
2004-07-28 by techy fellow
Yep ! I think so too. AT90Sxxxx belongs to the AVR family while AT89Sxxxx belongs to the 8051/ 2 family. David VanHorn wrote: At 01:04 AM 7/28/2004, Astria Nur Irfansyah wrote: >i dont think AT89s are AVRs. They aren't. __________________________________________________ Do You Ya
2004-07-28 by David VanHorn
At 01:04 AM 7/28/2004, Astria Nur Irfansyah wrote: >i dont think AT89s are AVRs. They aren't.
2004-07-28 by Astria Nur Irfansyah
i dont think AT89s are AVRs. The AT89 family is an 8051 avr is a microcontroller. Very different from AVR. 8051 is a CISC, AVRs r RISCs. But AVRs instruction set is not so reduced [in my opinion] so it is somewhat similar to 8051. The differences between 3 main families of avr [m
2004-07-28 by David VanHorn
> >The Atmel chips are supposed to offer a much better upgrade or should >I say, chip family ? The AVRs are very "portable". I've moved applications between chips, simply by providing the appropriate interrupt vector table. Most of the peripherals work the same between chips, tho
2004-07-28 by Mike Murphree
On Jul 27, 2004, at 8:21 PM, Larry Barello wrote: > What is your development environment? That might make a big > difference on > which programmer to use. Avrdude, which comes with the WinAvr (GCC C > compiler) works with a variety of programmers including some "no > parts" ones
2004-07-28 by Dave Mucha
Hi all, I have been looking at PICs and the Atmel chips and the major difference appears to be that PIC has one major category and all the parts are slightly different. It seems that you cannot write a program on a PIC and then just port it to any other pic. In some cases, it nee