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2007-10-22 by Jeffrey Engel
Me too! I know Xilinx shows that you can daisy-chain the outputs to the next device's inputs, but I have no idea whether that is applicable to AVR devices. Sounds like something interesting to breadboard. Jeff Engel --- Graham Davies wrote: > --- In AVR-Chat@yahoogroups.com, "Dav
2007-10-22 by dlc
And I always use one if I can - I like having an OH S#!% button. But in some designs, such a thing isn't a viable option anyway. With the complexity of the reset circuit that Atmel recommends, if the internal reset/startup circuit is reliable you'd save cost using it over an exte
2007-10-22 by Graham Davies
--- In AVR-Chat@yahoogroups.com, dlc wrote: > > .... I like having an OH S#!% button. Ah, I didn't mean I don't have an Oh S#!% button. I invariably do. I just don't have either an external RC network or an external reset chip because the internal reset thing seems to work so wel
2007-10-22 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Thomas Keller wrote: > ... ATtiny25 ... do I need to connect > the *RESET pin (pin 1) to something? So, you've had two replies saying the exact opposite things. I've taken a look at the data sheet and it seems clear to me that reset is taken care
2007-10-22 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "David Collier" wrote: > Does anyone know if it is possible > to daisy-chain the JTAGs ... Well, there is a way in AVR Studio to specify that a JTAG ICE interface is in a chain and give its position, so it would seem to be Atmel's intent that this
2007-10-22 by David Collier
JTAG I could swear I posted this here already, and if I did, I apologise. I'm putting 3 AT90CAN128 devices on a board. I have room for 3 tiny MLF parts, but not 3 JTAG connectors. Does anyone know if it is possible to daisy-chain the JTAGs and use normal programmers, debuggers et
2007-10-21 by Roy
Try looking at http://www.avrfreaks.net This site has many example projects etc. You also need to state which C compiler you are using. _______________________________________ Roy Hopkins ZL2RJH Tauranga New Zealand _______________________________________ -----Original Message---
2007-10-21 by Ralph Hilton
On Sat, 20 Oct 2007 16:21:14 -0000 you ("obaid_nasir_nu" ) wrote: >Can someone please provide me the C Programming Commands for AVR with >details. I shall wait for the reply guys and i am thanking all of u in >anticipation. > >Please help me out, a deadlock has been created in my
2007-10-21 by John Samperi
At 07:43 AM 22/10/2007, you wrote: >Question: for this device to start functioning when the >power is applied, do I need to connect the *RESET pin (pin 1) Unless you are using the reset pin as an GPIO you could use a 4.7K or 10K pull up and a 100nF cap to ground. Some people just
2007-10-21 by Thomas Keller
So, I have this cute little device I have developed for model railroaders. Based on an ATtiny25. Question: for this device to start functioning when the power is applied, do I need to connect the *RESET pin (pin 1) to something? Perhaps a resistive network to ground, with a small
2007-10-21 by Jim Wagner
On Sun, 21 Oct 2007 16:43:42 -0500 Thomas Keller wrote: > So, I have this cute little device I have developed > for model > railroaders. Based on an > ATtiny25. Question: for this device to start > functioning when the > power is applied, do I need to connect the *RESET pin > (pi
2007-10-21 by dlc
Google is your friend. DLC obaid_nasir_nu wrote: > Can someone please provide me the C Programming Commands for AVR with > details. I shall wait for the reply guys and i am thanking all of u in > anticipation. > > Please help me out, a deadlock has been created in my project. > >
2007-10-21 by Jim Wagner
On Sat, 20 Oct 2007 16:21:14 -0000 "obaid_nasir_nu" wrote: > Can someone please provide me the C Programming Commands > for AVR with > details. I shall wait for the reply guys and i am > thanking all of u in > anticipation. > > Please help me out, a deadlock has been created in m
2007-10-21 by BobGardner@aol.com
In a message dated 10/21/2007 6:23:22 A.M. Eastern Daylight Time, obaid_nasir_nu@yahoo.com writes: Can someone please provide me the C Programming Commands for AVR with details. Like particular commands for ADC ============================================= Lots of example program
2007-10-20 by ldevriesau
Hi all, I have often had students have a go at this with little success because they want to do it "cheaply" with "little effort". One suggestion I had for them was to, attempt to measure the Q ( quality factor ) or D(dissipation fact which is the inverse of Q) using some AC tech
2007-10-20 by obaid_nasir_nu
Can someone please provide me the C Programming Commands for AVR with details. I shall wait for the reply guys and i am thanking all of u in anticipation. Please help me out, a deadlock has been created in my project. Like particular commands for ADC e.t.c, please can someone giv
2007-10-20 by Ken Holt
I suppose Zack would have mentioned it - I would think that dielectric (capacitance) would be the best bet for a single parameter to measure. Two flat parallel plates (INSULATED) for a probe. Ken Robert Adsett wrote: > At 10:41 PM 10/18/2007 -0500, Zack Widup wrote: > > >I haven'
2007-10-20 by David Kelly
On Oct 19, 2007, at 3:15 PM, Chad G wrote: > The problem isn't the tiny26 itself. Its the board temperature > around the it. The tiny is absorbing that heat and its effecting > the CPU Clock Freq. So if you heatsink the AVR it will *absorb* even more of the heat. -- David Kelly N
2007-10-20 by Robert Adsett
At 10:41 PM 10/18/2007 -0500, Zack Widup wrote: >I haven't spoken out about this yet but I thought I'd throw in a few >words. I work for a geotechnical engineering firm that has a soils >testing lab. I spend quite a bit of time doing all sorts of soil and rock >tests, including m
2007-10-19 by dlc@frii.com
> The problem isn't the tiny26 itself. Its the board temperature around > the it. The tiny is absorbing that heat and its effecting the CPU Clock > Freq. Hmm, I'm afraid that is the nature of the beast. You need to spec your part to handle the expected temperature. If you are hav
2007-10-19 by Roy E. Burrage
Sounds like you might have other problems, Chad, unless it's an ambient temperature issue. If ambient, can you enclose the board and use an on-board thermistor to control an external thermo-electric module? A heatsink will eventually just stabilize at the ambient temperature, plu
2007-10-19 by Chad G
The problem isn't the tiny26 itself. Its the board temperature around the it. The tiny is absorbing that heat and its effecting the CPU Clock Freq. dlc@frii.com wrote: I'm curious as to why. I can't imagine the TINY26 needing a heatsink. DLC > I'm looking for a heat sink that wil
2007-10-19 by fjch100
Some Geophisics Theory: Some time ago one scientist called Archie found: F = Ro/Rw F= Rock formation factor Ro=Rock Resistivity Rw= Resistivity of fluid in the rock also F = a ----------- b P where: a = 0.65 for sandstone or 0.81 for limestone b = 2 for sandstone or 2.15 for lime
2007-10-19 by Jim Wagner
There are both pin and package current limits. Those limits have as much to do with silicon and wire current handling as thermal issues. Don't expect to exceed those limits with a heat sink. Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA On Fri, 19 Oct 2
2007-10-19 by dlc@frii.com
I'm curious as to why. I can't imagine the TINY26 needing a heatsink. DLC > I'm looking for a heat sink that will fit a Tiny26 (SO-20). If anyone > knows where I can find one I would appreciate the help. > > Thanks > > __________________________________________________ > Do You Y
2007-10-19 by Chad G
I'm looking for a heat sink that will fit a Tiny26 (SO-20). If anyone knows where I can find one I would appreciate the help. Thanks __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.
2007-10-19 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Sandu Teo wrote: > For my project, I need low accuracy. That's what I figured. So, are we done here? Do you have what you want from us? I think it's clear you need corrosion proof contacts, such as stainless steel. I'm suggesting you embed them in
2007-10-19 by Sandu Teo
Hello again, For my project, I need low accuracy. I just want to know when my little apple tree or plants that I have in the house need water. Just one type of soil. FTDI USB to serial converter sounds very cool. Zack Widup wrote: I haven't spoken out about this yet but I thought
2007-10-19 by Zack Widup
I haven't spoken out about this yet but I thought I'd throw in a few words. I work for a geotechnical engineering firm that has a soils testing lab. I spend quite a bit of time doing all sorts of soil and rock tests, including moisture contents. I never saw it mentioned exactly w
2007-10-19 by Granz
For doing things on the cheap, take a look at the Ghetto Development System: http://www.instructables.com/id/Ghetto-Programming%3a-Getting-started-with-AVR-micro/?ALLSTEPS And then follow up with the Microcontroller Programming instructable: http://www.instructables.com/id/Micro-
2007-10-18 by Jim Wagner
On Thu, 18 Oct 2007 23:15:06 -0000 "Graham Davies" wrote: > --- In AVR-Chat@yahoogroups.com, "Teo" > wrote: > > > I would like to develop a sistem > > based on Atmel to measure the moisture > > level of soil. Can you recommend me, > > please, one good and cheap sensor ? > > Use G
2007-10-18 by Thomas Keller
Show me soil with pure, distilled water in it. Look, I am just telling you what will work. There is no way for a simple test unit with a probe to tell the difference between water or high metallic content in the soil. I can tell you that dry soil, regardless of mineral makeup wil
2007-10-18 by Ralph Hilton
On Thu, 18 Oct 2007 16:16:18 -0500 you (Thomas Keller ) wrote: >Basicly, the resistance of soil is based on moisture content, because it >is the moisture >that provides the conductivity from particle to particle, not the >mineral or other >dry content of the soil. > I'd suggest t
2007-10-18 by Thomas Keller
Basicly, the resistance of soil is based on moisture content, because it is the moisture that provides the conductivity from particle to particle, not the mineral or other dry content of the soil. avrFreak Ralph Hilton wrote: > > On Thu, 18 Oct 2007 12:27:59 -0500 you (Thomas Kel
2007-10-18 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Teo" wrote: > I would like to develop a sistem > based on Atmel to measure the moisture > level of soil. Can you recommend me, > please, one good and cheap sensor ? Use Google to look up "soil moisture sensor". To make your own, fasten wires to t
2007-10-18 by Ralph Hilton
On Thu, 18 Oct 2007 12:27:59 -0500 you (Thomas Keller ) wrote: I was wondering how a simple resistance measurement could differentiate between a moist soil with low nutrient content and a drier soil containing a lot of soluble nutrients. > Generally speaking, moisture measurement
2007-10-18 by Thomas Keller
Generally speaking, moisture measurement in soil is accomplished thro0ugh the use of resistance measurement. A pair of probes is stuck into the soil, and the resistance is measured. IKn a digital approach, an empirically determined lookup table is then used to convert the resista
2007-10-18 by Teo
Hello, I would like to develop a sistem based on Atmel to measure the moisture level of soil. Can you recommend me, please, one good and cheap sensor ? I would also like to communicate via USB.
2007-10-16 by Zack Widup
I'd recommend downloading the data sheet for an AVR (something like the ATmega8 is probably a good starting place), get a programmer such as the STK-500 and start playing around with it. If you know 8051 assembler, AVR assembler isn't difficult to learn. Onee neat thing about the
2007-10-16 by BobGardner@aol.com
Download the eval version of the imagecraft compiler. Buy a board with an avr on it and a programmer. Compile some of the example programs, download them to the board, see if they run, change them slightly to do something different. -----Original Message----- From: kamalkumarkalr
2007-10-16 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "kamalkumarkalra" wrote: > what is the first step to learn AVR. Since you're already familiar with microcontrollers, just dive right in and get busy learning the similarities and differences. If you intend to program in assembly language, download
2007-10-16 by kamalkumarkalra
hello i want to know that how to go about AVR. where to start learning AVR. i know 8051/52 programming. now i want to know what is the first step to learn AVR.
2007-10-16 by Ned Konz
Arnim Littek wrote: >>>> Ned Konz 16/10/2007 2:21 a.m. >>> >> Domenico Arenga wrote: >>> I'm a student of the university of Pisa, Italy. I would want to know if >>> it is possible to use avr-GCC 4 on tinyOs. Excuse the disturbance, and >>> thanks thousands. > >> The extensions to
2007-10-14 by Alexandre Guimaraes
Hi, Ralph >Seems risky to me. Its going to depend a lot on the nature of this wildly fluctuating supply and short term changes >in voltage. Is the cost of a $0.50 regulator with 20 volt zener on the input via a resistor really excessive? I am also too worried to try it at somethi
2007-10-14 by Alexandre Guimaraes
Hi, Graham I would not ask the question without looking at the datasheet ! I was probably not clear enough about my concerns. The variation on the bandgap reference is ok to me and the part will definitely operate on the supply range, but will it operate properly with the power s
2007-10-14 by Alexandre Guimaraes
Hi, Roy Thanks for the prompt answer.. Nice part ! Cheap and quite easy to use. I think I got a simpler option for my project but I will keep it for future projects. The bandgap reference was not my main concern but the effect of fast fluctuation on the supply voltage. It is "noi
2007-10-13 by Ralph Hilton
On Fri, 12 Oct 2007 19:39:20 -0300 you ("Alexandre Guimaraes" ) wrote: Seems risky to me. Its going to depend a lot on the nature of this wildly fluctuating supply and short term changes in voltage. Is the cost of a $0.50 regulator with 20 volt zener on the input via a resistor r
2007-10-13 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Alexandre Guimaraes" wrote: >... simple and cheap zener regulator with > emitter follower ... Atmega168 with the > AD converter using the internal 1.1 volts > reference. As the input voltage range is > ... from about 5 volts up to 40 volts ... >
2007-10-13 by Roy E. Burrage
Talk about unregulated supply voltages... Have you looked at a switchmode regulator like the MC34063, Alexandre? Some, like the '063, will withstand up to 50 volt supply voltages and won't cost a lot to build...perhaps a couple of bucks for parts and some assembly time, but it de
2007-10-12 by Alexandre Guimaraes
Hi, I have an application where a simple and cheap zener regulator with emitter follower would be my best ( cheap) option for powering a Atmega168 with the AD converter using the internal 1.1 volts reference. As the input voltage range is way to big, from about 5 volts up to 40 v