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2004-03-14 by Wagner Lipnharski
Battery ---------->|----o----o MCU +VCC Main 5V6 Diode | Main +5V, Backup +4.8V | | Battery----------->|----' Backup 5.5V Diode I guess simpler than that is impossible. Does it solve your problem? jaythesis wrote: > hi! > > does anyone have a circuit design on back-up power suppl
2004-03-14 by stevech
there are two free IDEs and one low cost IDE to work with WinAVR (GCC), so you don't have to muck with makefiles. -----Original Message----- From: Larry Barello [mailto:yahoo@barello.net] Sent: Sunday, March 14, 2004 9:51 AM To: AVR-Chat@yahoogroups.com Subject: RE: [AVR-Chat] AV
2004-03-14 by VA3TO
>Sorry for any wrong wordings or phrases, but english is not my native >language. An if I sounded a little brisk - maybe I just needed a >little venting :) > > > Your english is better than many posters of which is their native language :) Hugh
2004-03-14 by upand_at_them
$1,000,000 bills okay? --- In AVR-Chat@yahoogroups.com, "Cobb, Quentin" wrote: > I'm looking for large piles of spare cash, US$, CAN$ or UK£ > > Anyone?
2004-03-14 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, John Johnson wrote: > > Do you have a snubber network across the relay contacts ? > no, what do you recommend? 10ohm and 10nf in series? I couldn't find a good web resource, so I'm kind of guessing. This subject is asked astonishingly often (not o
2004-03-14 by John Johnson
BASCOM is great for getting results in a hurry. One of my reservations with it is it's strange behavior when you mix a keyword into a variable name. Off the top of my head: support = &h12 Might get misinterpreted because support contains the word port. Again, that's just an examp
2004-03-14 by Larry Barello
I second BASCOM as easy and quick. It is terrible for large or complex as the code generation is mediocre at best. But if you use mainly the library support (e.g. keyboard input, LCD output, one wire interface, etc), those are all written in assembly and are generally very tight.
2004-03-14 by VA3TO
Sorry...Bascom is $85 ($59 if you're a student or cross upgrading from Bascom-8051). Still a deal ! Hugh
2004-03-14 by VA3TO
I never took to C and I usually prefer assembler but when it comes to the AVR, I am partial to Bascom. Todays Basic compilers are much more structured & efficient and have come a long way since the days of GOTO 100. "This is not your father's Basic" :) Bascom has a lot of built-i
2004-03-14 by David VanHorn
At 03:14 PM 3/14/2004 +0000, markevans_1 wrote: >Ok, I hope this message isnt the start of a huge thread, but I would >like biased/unbiased opinions on what you guys recon is the best >compiler for the AVR microcontroller. Is there a bad one? The AVR was designed for C, but there
2004-03-14 by markevans_1
Ok, I hope this message isnt the start of a huge thread, but I would like biased/unbiased opinions on what you guys recon is the best compiler for the AVR microcontroller. Basically I want something that is cheap, ideally comes with a fuctional IDE and is quick to code with ( has
2004-03-14 by David VanHorn
At 08:51 AM 3/14/2004 -0500, John Johnson wrote: >On Sunday, Mar 14, 2004, at 08:45 US/Eastern, David VanHorn wrote: > >> At 08:38 AM 3/14/2004 -0500, John Johnson wrote: >> >>> Not to split hairs here, but the two caps will never be equal. >> Or are you making the case, that lik
2004-03-14 by John Johnson
On Sunday, Mar 14, 2004, at 08:45 US/Eastern, David VanHorn wrote: > At 08:38 AM 3/14/2004 -0500, John Johnson wrote: > >> Not to split hairs here, but the two caps will never be equal. > Or are you making the case, that like two resistors, they may be > 0.001% off no matter how
2004-03-14 by David VanHorn
At 08:38 AM 3/14/2004 -0500, John Johnson wrote: >Not to split hairs here, but the two caps will never be equal. I think you're very much splitting hairs. Look at the crystal manufacturer's data sheets, and tell me where they show unequal values in any normal application. Or are
2004-03-14 by John Johnson
Sorry, it's the backup.jpg file. Regards, JJ On Sunday, Mar 14, 2004, at 08:33 US/Eastern, John Johnson wrote: > Here's a rough sketch: > > http://homepage.mac.com/johnatl/FileSharing25.html > > Regards, > JJ > > On Sunday, Mar 14, 2004, at 00:55 US/Eastern, jaythesis wrote: > >>
2004-03-14 by John Johnson
Not to split hairs here, but the two caps will never be equal. Regards, JJ On Saturday, Mar 13, 2004, at 21:39 US/Eastern, LightYearCS wrote: > Ladies and Gentlemen: > > > > This is a rumor I heard. Even a field engineer thinks he > heard of this also. > > > > It’s said that if y
2004-03-14 by John Johnson
Here's a rough sketch: http://homepage.mac.com/johnatl/FileSharing25.html Regards, JJ On Sunday, Mar 14, 2004, at 00:55 US/Eastern, jaythesis wrote: > hi! > > does anyone have a circuit design on back-up power supply? like if > the main power is cut-off, the battery automatically
2004-03-14 by David VanHorn
At 09:46 AM 3/14/2004 +0000, Brian Fairchild wrote: >They are not equal on the STK300 and there is no reason they should be equal. Sorry, that's wrong. The two caps absolutely should be equal, unless you have a good reason for them not to be. The two caps are in series, from the
2004-03-14 by VA3TO
The I2C limit is specified by the bus loading in capacitance...to a maximum of 400pF. I guess you have to look at this spec for each I2C device on your bus, add them up and make sure ththe total doesn't exceed 400pF. Hugh LightYearCS wrote: It can’t be that difficult. How many SP
2004-03-14 by VA3TO
I like the KISS approach... Depending on your needs, you can use a SPDT relay with a mains powered coil. When the power is on, the relay is energized and the N.O. contacts closed to make the DC circuit from power supply to your MCU board. (common to the MCU board, NO to the power
2004-03-14 by LightYearCS
Thanks for putting this behind me. I didn't think it was a problem. I only heard this from one person and a Atmel field engineer who thought he heard it. I'll probably ask in a couple other forums just to make sure. Barry -----Original Message----- From: Kathy Quinlan [mailto:kat
2004-03-14 by LightYearCS
Take a look at Texas Instruments Power MUX chips. These are idea for automatic power switch-over applications. I'm using the TPS2115 and it rocks: http://focus.ti.com/docs/prod/folders/print/tps2115.html Barry -----Original Message----- From: jaythesis [mailto:jaythesis@yahoo.com
2004-03-14 by Kathy Quinlan
> -----Original Message----- > From: Adam Bradley [mailto:adam_j_bradley@yahoo.com] > Sent: Sunday, 14 March 2004 4:49 PM > To: AVR-Chat@yahoogroups.com > Subject: [AVR-Chat] Re: Alternative to using ICP for decoding PWM > > > Larry, > > Thanks for your feedback on this. One comm
2004-03-14 by Brian Fairchild
They are not equal on the STK300 and there is no reason they should be equal. -----Original Message----- From: LightYearCS [mailto:lightyearcs@zippnet.net] Sent: 14 March 2004 09:27 To: AVR-Chat@yahoogroups.com Subject: RE: [AVR-Chat] Oscillator Lock?!?! Thanks for putting this b
2004-03-14 by Kathy Quinlan
-----Original Message----- From: LightYearCS [mailto:lightyearcs@zippnet.net] Sent: Sunday, 14 March 2004 10:39 AM To: AVR-chat@yahoogroups.com Subject: [AVR-Chat] Oscillator Lock?!?! Ladies and Gentlemen: This is a rumor I heard. Even a field engineer thinks he heard of this als
2004-03-14 by Adam Bradley
Larry, Thanks for your feedback on this. One comment, I've never seen C look so much like assembly :) Adam --- In AVR-Chat@yahoogroups.com, "Larry Barello" wrote: > I have used INT0, INT1, ICP and the Analog Comparator for decoding four > channels of PWM at the same time (each on
2004-03-14 by Larry Barello
I have used INT0, INT1, ICP and the Analog Comparator for decoding four channels of PWM at the same time (each one has selectable positive and negative edge triggers). If you use the analog comparator, of course, you need to set the other half to vcc/2 so it takes two pins... You
2004-03-14 by David VanHorn
At 06:39 PM 3/13/2004 -0800, LightYearCS wrote: >Ladies and Gentlemen: > > > > This is a rumor I heard. Even a field engineer thinks he heard of this also. > > > > It s said that if you use the same values for each of the capacitors used in the crystal oscillator circuit that som
2004-03-14 by jaythesis
hi! does anyone have a circuit design on back-up power supply? like if the main power is cut-off, the battery automatically takes over to supply the MCU. can i have the design? thanks in advance. -jay
2004-03-14 by Adam Bradley
Not 100% sure but it looks like using ICP on the Butterfly is out, whats a useful alternative for decoding PWM? External Interrupt pin? I hope I'm answering my own question correctly - would designating a pin as an external interrupt be appropriate? From datasheet from ATMEGA169.
2004-03-14 by LightYearCS
YES!! Oh yes I love it when I can get other people to do my work :) *sigh* I'm so stinking happy now. Thanks :) Of course I will double check this information. Anyone heard about this lockup thing? Is it a malicious rumor? Barry -----Original Message----- From: samperi@ampertroni
2004-03-14 by samperi@ampertronics.com.au
At 06:39 PM 13/03/04 -0800, you wrote: > Oh, and by the way, how many SPI devices do >you think the ATmega64 can handle, hrm?? Well you did say you could work it out but were being lazy :-) So if each pin can source and sink ~20mA and each input has an input current of less than
2004-03-14 by Adam Bradley
Quentin et al, Do you happen to know if further analysis was done on port usage on the Butterfly, specifically the ICP1 (PD0). A really handy pin to have free! Based on http://members.shaw.ca/climber/avrbutterfly it looks like its used by j401 for seg22. Any ideas? Adam --- In AV
2004-03-14 by LightYearCS
Ladies and Gentlemen: This is a rumor I heard. Even a field engineer thinks he heard of this also. It’s said that if you use the same values for each of the capacitors used in the crystal oscillator circuit that sometimes the oscillator will not start up and remain in a state of
2004-03-14 by Cobb, Quentin
I'm looking for large piles of spare cash, US$, CAN$ or UK£ Anyone? -----Original Message----- From: VA3TO To: AVR-Chat@yahoogroups.com Sent: Sat Mar 13 09:00:08 2004 Subject: [AVR-Chat] Re: Wanted: unused Dev boards, Butterfly etc.. I'm still looking for a spare STK-500 or maybe
2004-03-14 by John Johnson
Thanks, didn't think of that! Regards, JJ On Saturday, Mar 13, 2004, at 20:28 US/Eastern, LightYearCS wrote: > Try using http://www.whois.sc/domain-suggestions/?q= > > It may give you their phone number. Let me take a look. > > This person may know: > > Administrative Contact: >
2004-03-14 by LightYearCS
Try using http://www.whois.sc/domain-suggestions/?q= It may give you their phone number. Let me take a look. This person may know: Administrative Contact: Bonnard, Alan 24 William Street Paterson, NSW 2421 AU +66 1 8440351 Barry -----Original Message----- From: John Johnson [mail
2004-03-14 by John Johnson
You can use the same emitter/receiver pair for both beams. I'm no Michel Asciio, but I'll give it a shot: -----/-----\----- -----u-----^----- / and \ represent mirrors (front surface?). u is a receiver. ^ is an emitter (laser diode?). With a bright enough source, this mirror patt
2004-03-14 by John Johnson
Futurlec has some inexpensive boards http://www.futurlec.com/index.shtml although they have no voice phone number on their website that I could find. I'll email them and ask for it, just for grins. They are also advertised on the Atmel site, which means nothing, I'm sure. Regards
2004-03-13 by LightYearCS
It can’t be that difficult. How many SPI interfaces can an ATmega64 handle?
2004-03-13 by LightYearCS
Try using www.findchip.com to search to search for parts. It works very well for such things although normally chip and part numbers are used instead of insect names. -----Original Message----- From: Mike Murphree [mailto:mike@tropo.org] Sent: Saturday, March 13, 2004 8:01 AM Sub
2004-03-13 by Mike Murphree
On Mar 13, 2004, at 10:00 AM, VA3TO wrote: > I'm still looking for a spare STK-500 or maybe even an STK-200 > or 300 to try something with. DigiKey has 379 of them for $79 each... search for STK500 Mike
2004-03-13 by VA3TO
I'm still looking for a spare STK-500 or maybe even an STK-200 or 300 to try something with. Anyone ? Hugh
2004-03-13 by Mike Murphree
On Mar 13, 2004, at 9:34 AM, Adam Bradley wrote: > I took am keen to get hold of 1 or 2 Butterfly's, please email me if > you have any for sale! DigiKey had them in stock recently. I'm not parting with mine... Mike
2004-03-13 by Wagner Lipnharski
LightYearCS wrote: > Generally speaking you ALWAYS need bypass capacitors. The AVR chips > generate a lot of power supply spikes which the bypass capacitors > "bypass" to ground. [snip] That's the old tricky point of view. In anyway the capacitors would solve the problem, so... I
2004-03-13 by Dave VanHorn
At 05:10 PM 3/12/2004 -0800, LightYearCS wrote: >Generally speaking you ALWAYS need bypass capacitors. The AVR chips >generate a lot of power supply spikes which the bypass capacitors >"bypass" to ground. That's not really the right way to look at it. All micros, and most logic,
2004-03-13 by Adam Bradley
I took am keen to get hold of 1 or 2 Butterfly's, please email me if you have any for sale! Adam --- In AVR-Chat@yahoogroups.com, "radeohedca" wrote: > Looking for 2nd hand AVR Dev board like the Atmel Butterfly, or > anything from EDTP, Futurlec, or ??? > Please contact me by e-
2004-03-13 by stevech
did the poster explain what the reset pin circuitry is? -----Original Message----- From: dvanhorn@cedar.net [mailto:dvanhorn@cedar.net] Sent: Friday, March 12, 2004 7:45 AM To: AVR-Chat@yahoogroups.com Cc: JChavez@soboce.com Subject: Re: [AVR-Chat] It just rests > > I forgot to m
2004-03-13 by LightYearCS
Take a look at this line of parts for working with photodiodes: http://www.maxim-ic.com/quick_view2.cfm?qv_pk=3760&ln= -----Original Message----- From: Dave VanHorn [mailto:dvanhorn@cedar.net] Sent: Wednesday, March 10, 2004 1:37 PM Subject: Re: [AVR-Chat] Re: Speed Trap At 09:23
2004-03-13 by Kathy Quinlan
Hi guys, How do we simulate the data being received by the USART in AVR studio 4.8 ? I have read the help file, but do not know how to do it: UART/USARTS The UART/USART is supported by the Simulator. The UART/USART interrupt vectors and the Receive/Transmit pins are set up as des