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2011-01-08 by Jim Wagner
Yes, that was the "I think" caveat. That suggests being able to use smaller limiting resistors. The high capacitance CAN be a challenge. Sometimes, it will actually help. Whether it hurts or helps depends on the "source resistance" of the signal source. Logic is typically 80-200
2011-01-08 by Steve Hodge
Thanks, Jim. You have been a good help. I do have a bunch of RF ferrite chokes that I put here and there. They didn't do anything to solve the SSB radio turning on the horn (!), but a shielded cable did. The tip about there being no one solution helps actually. I guess I was look
2011-01-08 by Chuck Hackett
> From: Eugene > > Hello Chuck, > I'm deeply impressed with your railroad simulation hobby :). It should be > really interesting to look at it in real life. Simulation? Check out: http://www.youtube.com/watch?v=YRadVDw5dBA :-) > I use WinAvr in a line of projects, but I don't use
2011-01-08 by Leon Heller
On 05/01/2011 09:43, Prashant D. Kharade wrote: > Hello Tim, > > > > I am using AVR. > > If one wants to shift to arm, what shall be the start point. > > Arm7, Arm9 or new cortex. > > > > Which make arm controllers are good as learning curve. Cortex. NXP. Leon -- Leon Heller G1HS
2011-01-08 by Richard Reeves
I've been using a couple of Cortex-M3 evaluation boards from Luminary Micro (now part of Texas Instruments), specifically the the LM3S1968 and LM3S6965 (that one has ethenet). The peripherals are straightforward (if you understand Timer1 on an AVR, the timers on the LM3S micros a
2011-01-08 by Jim Wagner
I missed the part about radios, radar, etc. So, in addition to transient protectors, liberal use of lossy ferrites (beads, etc) are strongly called for. There really is no one technology that will handle the full spectrum of ESD, lighting, general conducted EMI, and RF through mi
2011-01-08 by Dave McLaughlin
Check out the DS1338 instead as it has a battery backup switchover built in and it can work at 3.3V too. The DS1307 is a nice device but suffers from terrible clock drift when I have used it in the past. I have a design here that gains about 5 mins per week with it. The DS1338 ba
2011-01-06 by wagnerj@proaxis.com
You need to limit the current going into the clamping diode IN the AVR. So, under over-volt conditions, one end of the resistor is at the AVR's Vcc and the other is at the transient protector's "clamping voltage". I simply chose 5V as an example of a system Vcc value. Hmm, I slip
2011-01-06 by Steve Hodge
Got it. Thanks. But just to make sure I truly get it, in your equation "(7.5V-5V)/0.1ma", "7.5V" is the breakdown voltage and "5V" is the working voltage? In my case, with 3.3 V Transguards and Vcc = 3.3 V, the equation would be (5.0-3.3)/0.1 = 17K? From a practical point of view
2011-01-06 by wagnerj@proaxis.com
If data rates will allow, simply add a resistor between the AVR port and the transient protector. I think (but may be wrong) that communication with Atmel has established a limit of 0.1ma forward current in the internal over-voltage protection diodes inside an AVR. Thus, if the t
2011-01-06 by Cat C
Diodes? > To: AVR-Chat@yahoogroups.com > From: steve@terrafirma.us > Date: Thu, 6 Jan 2011 09:10:34 -0800 > Subject: RE: [AVR-Chat] AVX Transguard > > Hmmm. It's beginning to sound like a crap-shoot. The device I'm > specifically looking at protecting is an AVR uC, its I/O lines
2011-01-06 by Steve Hodge
Hmmm. It's beginning to sound like a crap-shoot. The device I'm specifically looking at protecting is an AVR uC, its I/O lines specifically. How would you do it, if I may ask? The environment is a boat one, basically an automobile one (engines, pumps, motors) with the added featu
2011-01-06 by wagnerj@proaxis.com
You need to look at the tolerance specs. And, it depends, greatly, on what the connected electronics will tolerate. I just looked up the AVX parts, and they are spec'd a bit differently from some of the others. The 3.3V parts are rated for a 5.0V +/-20% breakdown. That means anyw
2011-01-06 by Eugene
Hello Chuck, I'm deeply impressed with your railroad simulation hobby :). It should be really interesting to look at it in real life. I use WinAvr in a line of projects, but I don't use any software pc debugger or(and) any IDE over WinAvr. Best regards, Eugene Sorokin --- In AVR-
2011-01-06 by Steve Hodge
Thanks, Jim. I had chosen Transguards with a working voltage of 3.3 V because I use 3.3 V signals (most DC, but a few up to 10-50 KHz). It sounds like you saying you would be a bit leery of doing that, and it would it be better to go with ones with some headroom. The next availab
2011-01-06 by Deepak Patil
Hi, Any one can suggest me a programmer for AT89C2051. I am very new into this and i want to program AT89C2051 for temperature display. pls. suggest me circuit also if possible. Thank you in advance. Regards,Deepak Patil.deepakpatil23@yahoo.com --- On Thu, 1/6/11, Jim Wagner wrot
2011-01-06 by Jim Wagner
Steve - Even though you may consider it AC, what really matters is the extreme peaks in normal operation, relative to the "ground" that the transient absorber is connected to). Transguards, and their relatives work fine with digital signals. If your signal is between 0V and some
2011-01-05 by Steve Hodge
A quick question on the AVX Transguard transient voltage suppressors. The specs give a DC and AC working voltage. The AC value looks like 0.7 x DC value, so I assume it is an RMS value. If so, is it then ok to put a 3.3 V Transguard (DC working V = 3.3 V, AC working V = 2.3 V) on
2011-01-05 by Prashant D. Kharade
Hello Tim, I am using AVR. If one wants to shift to arm, what shall be the start point. Arm7, Arm9 or new cortex. Which make arm controllers are good as learning curve. Thanks Prashant From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Tim Mitchell Sent
2011-01-05 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of wagnerj@proaxis.com Sent: 05 January 2011 00:15 To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Re: Project status report and question ... > Agree, but.... > > I think this
2011-01-05 by Dave McLaughlin
Hi Chuck, Well done on the progress. Good to hear you went straight to CAN. I have one comment on using interrupts that you might need to be aware of. This won't apply if all your code for the MCP2515 is done in the interrupt handler and you are not using SPI for anything else. T
2011-01-05 by wagnerj@proaxis.com
> --- In AVR-Chat@yahoogroups.com, wagnerj@... wrote: >> I think this is an inherent limit due to JTAG debugging. >> You don't get history information out of JTAG. > Some ICE debuggers implement an execution trace buffer (JTAG does not) but > that is not what the OP was referring
2011-01-05 by Moses McKnight
I used it for one AVR project. I work mostly in Linux and it runs there as well, but I also used it in windows with WinAVR. I did not use GDB so I can't comment on that. Code::Blocks is a nice IDE - in general I like it better than Eclipse, but there is another IDE called CodeLit
2011-01-05 by wagnerj@proaxis.com
Agree, but.... I think this is an inherent limit due to JTAG debugging. You don't get history information out of JTAG. You just get the current state at the breakpoint. The "alternative" would be single-step operation, which would hardly be "real-time", due to the less than speed
2011-01-04 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, wagnerj@... wrote: > I think this is an inherent limit due to JTAG debugging. > You don't get history information out of JTAG. Some ICE debuggers implement an execution trace buffer (JTAG does not) but that is not what the OP was referring to. If
2011-01-04 by Chuck Hackett
I just came across the Code::Blocks open source cross-platform graphical IDE. So far it seems to indicate that it runs on Windows, is extensible (via scripts) and supports GDB, etc. Anyone using it with WinAVR et. al.? Cheers, Chuck Hackett "Good judgment comes from experience,
2011-01-04 by Chuck Hackett
> From: Reid > > I am interesting how you coming on your project. I would like to see it. > > reid I don't have anything in "publishable" form yet (especially the software). What would you like to see? Do you have a railroad you'd like to add signals to? Cheers, Chuck Hackett "Go
2011-01-04 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Chuck Hackett" wrote: > I'm currently using AVRStudio W/WinAVR but I would like to find a > (Windows based) debugger that has things like stack-traceback I could be wrong but I believe that avr-gcc doesn't provide the necessary debug information
2011-01-04 by Reid
I am interesting how you coming on your project. I would like to see it. reid On Tue, Jan 4, 2011 at 3:52 PM, Chuck Hackett wrote: > > > Most of my questions on the list over the last year or so have had to do > with an > ATMega32-based railroad signal controller for ride-on hobb
2011-01-04 by Chuck Hackett
Most of my questions on the list over the last year or so have had to do with an ATMega32-based railroad signal controller for ride-on hobby railroads that I am developing. With the help of the list I have: - Finalized the design of the PCB - Made a prototype PCB (using Eagle and
2010-12-29 by Steve Hodge
Yeah, I did exactly that, added them to my project config while trying to solve the issue. You're right, works just as well without them in the project config (and thus gone from the command line). Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf O
2010-12-29 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Steve Hodge" wrote: > and here is the compile line generated [...] I believe that the first two -I options are superfluous; I don't use them and I can compile without errors. (Perhaps you added them in an effort to solve the problem you were havi
2010-12-29 by Steve Hodge
Ah, thank you. That did it. Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of wagnerj@proaxis.com Sent: Wednesday, December 29, 2010 11:46 AM To: AVR-Chat@yahoogroups.com Subject: RE: [AVR-Chat] Re: WinAvr TWI include files There is no TXEN in a
2010-12-29 by wagnerj@proaxis.com
There is no TXEN in a 644. It is TXEN0 or TXEN1. Jim Wagner Oregon Research Electronics > Don, I think I have those things correctly. Here are the include files > (in > order): > > > > #include > > #include > > #include > > #include > > > > and here is the compile line generated
2010-12-29 by Steve Hodge
Don, I think I have those things correctly. Here are the include files (in order): #include #include #include #include and here is the compile line generated and the first few error messages: avr-gcc -I"C:\Program Files\WinAVR\avr\include\avr" -I"C:\Program Files\WinAVR\avr\inclu
2010-12-29 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Steve Hodge" wrote: >But the Project Configuration/Compile does >not seem to use [the file iom644PA.h]. The part-specific include file will be included automatically if: 1) you include "avr/io.h" 2) you properly define the target MCU so that it g
2010-12-29 by Steve Hodge
I am trying to get up and running with TWI/I2C using WinAvr under AVR Studio, but when I go to compile sample TWI/I2C C files (from AvrFreaks, etc) some symbolic constants, like TWEN, are missing. I am doing this for a ATmega644P controller and this is set in my Project Configura
2010-12-15 by Prashant D. Kharade
Hi, You can use DS1307 as a RTC. You can connect it via I2C to any AVR uC. There are many sample codes available. I used I2C library by peter fleurry in one of my project. Use bcd to dec conversion to send the data from RTC to LCD. For LCD also you can have peter fleurry library.
2010-12-15 by Dave McLaughlin
I also replied to this on the Codevision group but here is a copy here too. Have a look on AVR Freaks or do a Google search. There a number of them out there or why not create your own unique design. I have just completed a large digital clock with six 128 x 64 LCD graphics displ
2010-12-13 by Genius Man
Hi dear I am really looking for a project with atmega 16 or atmega 32 in codevision for real time clock (digital appearance ) connected to lcd and its schematic. Thanks in advance for your help [Non-text portions of this message have been removed]
2010-12-11 by Adeilton Oliveira
I posted this message in Arduino forum but I guess it will be more useful here. -- Hello guys, Some weeks ago I posted I started using the free, open source, BRTOS (http://brtosblog.wordpress.com/) in my Babuino Project (http://babuinoproject.blogspot.com) - a LOGO interpreter ru
2010-12-05 by John Samperi
At 02:50 AM 6/12/2010, you wrote: >I assume you guys can't see AVRfreaks either since Friday. Just got on now, 7am Sydney time. It was down all day yesterday. Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place
2010-12-05 by Leon Heller
On 05/12/2010 15:50, bobgardner32839 wrote: > I assume you guys can't see AVRfreaks either since Friday. I wish they'd put up some sort of 'Standby... maintenance ongoing' or something. I haven't heard of any earthquakes or floods in Trondheim. Maybe a denial of service attack by
2010-12-05 by Dave McLaughlin
I wonder if this has something to do with the Wikileaks DOS attacks that are going on just now as my own website has also disappeared as have a few others I use regularly. Dave. From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Jim Wagner Sent: 05 Dece
2010-12-05 by Jim Wagner
On Dec 5, 2010, at 7:50 AM, bobgardner32839 wrote: > I assume you guys can't see AVRfreaks either since Friday. I wish > they'd put up some sort of 'Standby... maintenance ongoing' or > something. I haven't heard of any earthquakes or floods in > Trondheim. Maybe a denial of serv
2010-12-05 by bobgardner32839
I assume you guys can't see AVRfreaks either since Friday. I wish they'd put up some sort of 'Standby... maintenance ongoing' or something. I haven't heard of any earthquakes or floods in Trondheim. Maybe a denial of service attack by microchip fanatics?!? Anyone want to email th
2010-12-03 by Chuck Hackett
> From: rob@usbmicro.com > > > (Off List) > > > - what do you think? > > We all think you posted this to the list. :-P Well Rob, I guess I made my question to Tim moot! I keep forgetting to change the 'To' address ... (hangs head in shame) ... My experience with CrossWorks so far
2010-12-03 by Jonathan King
Eugene, Just a few comments on the FETs You list the IRFZ46, which is rated only for 10V drive. If you look at Fig 1 in it's data sheet, driven by 4.5V, it's performance is much less than you might be expecting. A FET designed to be driven by 5V will give you better performance f
2010-12-03 by evgenii sorokin
Hello Andy, Sure. I'll post it all after prototype board and source code building up. I do not pretend to make them as good as commercial ones. This is just a hobby machine. Best regards, Eugene
2010-12-03 by rob@usbmicro.com
> (Off List) > - what do you think? We all think you posted this to the list. :-P