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2009-09-09 by stevech11
I've been working professionally for 3 years now in IEEE 802.15.4 and have these tid-bits, and if you wish, I can elaborate.... ZigBee is not IEEE 802.15.4 and vice-versa. The comparison might be IEEE 802.3 versus IP/ethernet. ZigBee is one of several network layer protocols used
2009-09-08 by Chuck Hackett
> From: Mike Payson > .... > > I'm confused by the power issue... You say you are already providing > 48vdc, so why not just step the power down for the Zigbee? Running > cable isn't quite as bad since you already have the conduit, but it > still seems that running cable would be
2009-09-08 by Mike Payson
>> -----Original Message----- >> From: Mike Payson >> >> Hmm... This sounds to me like a perfect application for a Zigbee >> network. The modules are a bit more expensive, but since you wouldn't >> have to run wires, the final cost should be roughly comparable if not >> substanti
2009-09-07 by Chuck Hackett
> -----Original Message----- > From: stevech11 > I'd think that the low speed confg would be fine. From what I've read so far I believe it would be fine. After the application is more defined I'll have a better hand on message sizes and xmit rates are. Of course it depends on wha
2009-09-07 by Adeilton Oliveira
Guys, Here is the link http://babuinoproject.blogspot.com/ Regards. Adeilton Oliveira wrote: > > > Hello guys, > > I'll share with you the weekend project I am developing with Arduino > board and AVR Studio. > This is a Robot dev. plataform. I can program the Arduino in LOGO > la
2009-09-06 by Chuck Hackett
> From: ecros_technology > > .... > I set the lock bits in the AVR ICE-Cube and other products with Flash > loaders for field-update of firmware: > .... Thanks for the info Graham. I'll put that in my "do before it goes out the door" procedures :-) Cheers, Chuck Hackett "Good jud
2009-09-06 by Mike Payson
This sounds cool. I look forward to hearing more about your project! On Sun, Sep 6, 2009 at 2:17 PM, Adeilton Oliveira wrote: > Hello guys, > > I'll share with you the weekend project I am developing with Arduino > board and AVR Studio. > This is a Robot dev. plataform. I can pro
2009-09-06 by Adeilton Oliveira
Hello guys, I'll share with you the weekend project I am developing with Arduino board and AVR Studio. This is a Robot dev. plataform. I can program the Arduino in LOGO language using the Cricket Logo, Logo Blocks (it's not working 100%), iCode, and CTI Blocos. Regards.
2009-09-06 by Timo
Chuck Hackett wrote: > I read somewhere that CAN was used up to 400m due to timing considerations. > Can this distance be extended by altering (possibly 'non-standard') timing > parameters within the AVR hardware? Table of maximum bus length vs. speed: http://www.can-cia.org/inde
2009-09-06 by ecros_technology
--- In AVR-Chat@yahoogroups.com, "Chuck Hackett" wrote: > By "disable verification", I assume > you mean turning off LPM in the > application section ... No. In your original post, you wrote (in part): >> For a "hostile" environment (to protect the code): >> (snip) >> LB: Program
2009-09-06 by Mike Payson
Hmm... This sounds to me like a perfect application for a Zigbee network. The modules are a bit more expensive, but since you wouldn't have to run wires, the final cost should be roughly comparable if not substantially less. Individual lengths can be as much as 1 mile, but since
2009-09-05 by stevech11
I'd think that the low speed confg would be fine. --- In AVR-Chat@yahoogroups.com, dlc wrote: > > I've used CAN networking at 250Kbps on runs of up to 1000 feet with no > problems. Lower frequencies can tolerate longer runs. However, if you > can deal with very low baud rates (wh
2009-09-05 by dlc
I've used CAN networking at 250Kbps on runs of up to 1000 feet with no problems. Lower frequencies can tolerate longer runs. However, if you can deal with very low baud rates (which are less sensitive to timing and impedance issues), of say 9600 and lower, you can simply use any
2009-09-05 by Chuck Hackett
I preface this question with the fact that I have very limited knowledge of CAN bus and DeviceNet technologies (I do have a background in data communications from both the EE and software engineering perspective). I have only 'skimmed' the description of CAN bus and DeviceNet on
2009-09-05 by Jim Wagner
Hello, Mark - It depends a little on what you call "read time". You have to load several registers with address and such. Then, it is available immediately. There is no wait time like there is on write. Jim Wagner Oregon Research Electronics On Sep 5, 2009, at 6:06 AM, enkitec@gm
2009-09-05 by enkitec@gmail.com
Hi, I can't find the EEPROM read byte time in the ATMega168 datasheet. Is this time the same as reading one byte from the SRAM? Thanks. Mark Jordan
2009-09-04 by Chuck Hackett
> From: ecros_technology > > --- In AVR-Chat@yahoogroups.com, "Chuck Hackett" > wrote: > > > ... proper fuse settings for a device > > ... to be shipped as a final product. > > JTAGEN: Disable to protect the code > > SPIEN: Disable to protect the code > > Why would you want to di
2009-09-04 by Chuck Hackett
> From: John Samperi > > At 01:32 PM 4/09/2009, you wrote: > > SPIEN: Disable, no OC level debugging expected in the field > > SPIEN: Disable to protect the code > > You don't need to disable SPIEN, anyway you can't do it without > using HVPP if you disable JTAG. Once the lock-bi
2009-09-04 by ecros_technology
--- In AVR-Chat@yahoogroups.com, "Chuck Hackett" wrote: > ... proper fuse settings for a device > ... to be shipped as a final product. > JTAGEN: Disable to protect the code > SPIEN: Disable to protect the code Why would you want to disable JTAG and SPI if you've used the lock bi
2009-09-04 by John Samperi
At 01:32 PM 4/09/2009, you wrote: > SPIEN: Disable, no OC level debugging expected in the field > SPIEN: Disable to protect the code You don't need to disable SPIEN, anyway you can't do it without using HVPP if you disable JTAG. Once the lock-bits are enabled then you can't read
2009-09-04 by Chuck Hackett
I'd like to verify my understanding of the proper fuse settings for a device (ATMega16) to be shipped as a final product. I'm shipping some parts now but it's a friendly beta environment so some settings will be relaxed. My understanding is that, just prior to shipping, I sho
2009-09-03 by Chuck Hackett
> From: Tim Mitchell > .... > Hang on a minute, how are you programming this board? If you're using > ISP and the clock really isn't running, you would not be able to > program > it back to internal osc once you'd set it to external - the ISP would > stop working. I'm programming
2009-09-03 by Tim Mitchell
> > My problem is that everything works fine when the clock > > fuses are set for internal 1 MHz (chip default) but, > > when I attempt to set the fuses for operation with the > > board-mounted 8 MHz crystal the chip acts like it does > > not have any clock running. Hang on a min
2009-09-03 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Chuck Hackett Sent: 03 September 2009 06:49 To: AVR-Chat Subject: [AVR-Chat] Setting ATMega16 clock options > I have an ATMega16 mounted on a Olimex AVR-P40-8535 > prototyping b
2009-09-03 by mago Umandam
Thanks Jim for clear answer. I spent about an hour searching the net with no clear answer. Posting a question here on avr-chat would give me an answer faster:) cheers, mago --- On Thu, 9/3/09, Jim Wagner wrote: From: Jim Wagner Subject: Re: [AVR-Chat] OT. ON Resistance To: AVR-Ch
2009-09-03 by Chuck Hackett
I have an ATMega16 mounted on a Olimex AVR-P40-8535 prototyping board (Schematic here: http://olimex.com/dev/images/avr-p40-8535-sch.gif). My problem is that everything works fine when the clock fuses are set for internal 1 MHz (chip default) but, when I attempt to set the fuses
2009-09-03 by Jim Wagner
Flatness tells you how much the on-resistance varies with voltage over the range of allowable voltages. Thus, I would expect 0.5ohm flatness to indicate that the resistance will be within a 0.5ohm "window", maybe with an average of 2.5 ohms or maybe 2.5ohms at some nominal voltag
2009-09-03 by mago Umandam
Out of topic. Anyone can give the difference between ON resistance and ON resistance flatness? Im reading a datasheet of a multiplexer that says 2.5 ohm ON resistance, 0.5 Ohm resistance flatness. Is it average ON resistance? regards, mago [Non-text portions of this message have
2009-09-02 by stevech11
I'm playing with this low cost plug and play - good for the inexperienced. Simple USB bootloader, used with Atmel Studio + WinAVR or any other compiler that produces .hex. http://www.pjrc.com/teensy/ loader is super simple to use. --- In AVR-Chat@yahoogroups.com, John Samperi wro
2009-09-02 by Cat C
It's not multiples of 1ms. Ideally I'll have 50ns (1 clock) resolution. So I can't even use the simple delays (3-4 clocks). I may get back to the timers, at least if I change the "n" by 1 it will be another 50ns (at 20MHz). Thanks, Cat > To: AVR-Chat@yahoogroups.com > From: sampe
2009-09-02 by John Samperi
At 09:26 AM 2/09/2009, you wrote: >I will need to set/change delays when the program runs (run-time?) If it is multiples of 1ms then have a function that uses a variable to call_delay_ms(1); a number of times. Regards John Samperi *************************************************
2009-09-01 by Cat C
... > Hmmm, there is a .h file in the avr-gcc includes with calibrated delay > loops just begging to be used. Look at . You might want to > use directly. > I looked into using the delay.h routines but "the delay time must be an expression that is a known constant at compile-time"
2009-09-01 by Warren Brown
Hi Chuck, Have you had a look at the latest chip45.com boot-loader? Cheers Warren.
2009-09-01 by wagnerj@proaxis.com
Glad I could help. Jim > > Thank you Jim, > > I finally get it : - S > I had mi mind set on a different meaning and couldn't get out of it... > > I suppose the inconsistencies in terminology between manufacturers doesn't > help either... one registers and one samples; one "drives
2009-09-01 by Cat C
Thank you Jim, I finally get it : - S I had mi mind set on a different meaning and couldn't get out of it... I suppose the inconsistencies in terminology between manufacturers doesn't help either... one registers and one samples; one "drives data out" and one does "setup"... ah m
2009-09-01 by Chuck Hackett
I am attempting to program an ATMega16 with a serial booloader using: 1) AVRStudio 4.16(build: 628), connect speed lowered to 9600 2) AVR Ice-Cube JTAG device 3) GCC produced HEX file with SW from http://www.siwawi.arubi.uni-kl.de/avr_projects/ I verified that AVRStudio is connec
2009-09-01 by wagnerj@proaxis.com
> > Hi there, > > Looking at Fig. 15.3 (Pg. 167) and reading the "15.4 Data Modes" paragraph > on Pg. 166, I don't see that: > > "Data bits are shifted out and latched in on opposite edges of the SCK > signal" > > I thought that means that Data Out is valid on MOSI on Rising SCK
2009-09-01 by Cat C
Hi there, Looking at Fig. 15.3 (Pg. 167) and reading the "15.4 Data Modes" paragraph on Pg. 166, I don't see that: "Data bits are shifted out and latched in on opposite edges of the SCK signal" I thought that means that Data Out is valid on MOSI on Rising SCK and Data In is Sampl
2009-09-01 by Chuck Hackett
> From: John Samperi > > .... (USB Bootloader) .... > > I would suspect that would be rather large because of the USB > firmware, but if you have the room why not. > > Most boot-loaders have been designed to squeeze into the least > amount of flash. .... > > All of my boards just
2009-09-01 by dlc
Or... Check out an Arduino install and look at the bootloader source in there. There are options for creating the bootloader on a MEGA128 using one of the USARTs. The Arduino bootloader is based upon the Atmel app note that makes it look like an AVR ISP (STK500). Then you can jus
2009-09-01 by stevech11
popular one - free. Includes Windows graphical user interface. http://www.avrfreaks.net/index.php?module=Freaks%20Academy&func=viewItem&item_type=project&item_id=625 Have you looked at the others in the projects section of AVRfreaks' forum? --- In AVR-Chat@yahoogroups.com, John S
2009-08-31 by John Samperi
At 03:51 AM 1/09/2009, you wrote: >across this one that is USB connected: I would suspect that would be rather large because of the USB firmware, but if you have the room why not. Most boot-loaders have been designed to squeeze into the least amount of flash. Also not that the bo
2009-08-31 by Chuck Hackett
I was searching the internet for suggested serial port boot loaders for ATMegas (ATMega16 at the moment) and I can across this one that is USB connected: http://www.fischl.de/avrusbboot/ Anyone have experience with this or a similar USB boot loader to recommend? I'd like to keep
2009-08-27 by Cat C
Sorry David ... indeed my boss just asked me what I'm drinking for some other reason... ... > On Thu, Aug 27, 2009 at 11:51:24AM -0600, Cat C wrote: > > > > Thanks Kelly, > > David, actually. You too must be drinking decaf today. :-) [Non-text portions of this message have been r
2009-08-27 by David Kelly
On Thu, Aug 27, 2009 at 11:51:24AM -0600, Cat C wrote: > > Thanks Kelly, David, actually. You too must be drinking decaf today. :-) > > Yes, thats convenient but I'm thinking you should research the PWM > > capabilities of the AVR as all or almost all of what you want can be > >
2009-08-27 by Cat C
Thanks Kelly, > Yes, thats convenient but I'm thinking you should research the PWM > capabilities of the AVR as all or almost all of what you want can be > implemented in hardware. Specifically I'd look into doing it like this: I never even thought of using the PWM for non-repeti
2009-08-27 by David Kelly
On Thu, Aug 27, 2009 at 09:45:52AM -0600, Cat C wrote: > > Hi there, > > I am in a bit of a dilemma here, trying to choose the right chip for an application. > > One requirement is that I need to be able to generate some microsecond > (let's say between 1 - 100us) length pulses,
2009-08-27 by Cat C
Hi there, I am in a bit of a dilemma here, trying to choose the right chip for an application. One requirement is that I need to be able to generate some microsecond (let's say between 1 - 100us) length pulses, the timing between them about the same... kind of like this: - a 40us
2009-08-25 by s.holder123@btinternet.com
Microchip tc4431/32, might be worth looking at. Regards --- In AVR-Chat@yahoogroups.com, dlc wrote: > > My typical favorite is the 754410, especially if you are low current. > > DLC > > u4ia2000 wrote: > > Ok, if you need help ask, right. I've been searching through spec. sheets
2009-08-25 by dlc
My typical favorite is the 754410, especially if you are low current. DLC u4ia2000 wrote: > Ok, if you need help ask, right. I've been searching through spec. sheets all day and I'm getting dizzy-- looking for an "H-Bridge" chip to work from an AVR Butterfly that can switch 30 or