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2005-05-22 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Brian Dean wrote: > ... do you plan to do [an inexpensive > JTAG device] that supports the JTAGICE > MkII protocol? No, I'm afraid I don't. There are several reasons. One is that my personal circumstances have changed and I no longer have time for
2005-05-22 by Christopher G Worley
Red Lion or Yamitaki Honeywell comes to mind. Simple all in one units that have either analog or relay outputs for heat treat furnaces. As that's one of the few things I know of that requires 500C. You need the controller and a servo gas valve. As to the homebrew stuff, don't. Th
2005-05-21 by John Samperi
Thanks again for more suggestions and ideas. I'm sorry I can't be more specific on the application yet but I don't really know how confidential the information is, whether it is covered by patents or pending patents so I'm trying to be generic in terms so I don't get into any pos
2005-05-21 by Zack Widup
Interesting. Thanks for the link. What I'm looking for is something to be lowered down a 2 1/2 inch diameter PVC pipe into a coal mine on a borehole camera. The sensor should probably be an inch in diameter or less. We've encountered situations where we don't know which direction
2005-05-21 by Bruce Parham
Zack Widup wrote: > On Sat, 21 May 2005, Robert Adsett wrote: > > This is sort of distantly related to the topic. Have any of you ever done > anything with a flux gate compass? > > Zack I worked for a small company in Texas about 20 years ago that did and from scratch. Quite an i
2005-05-21 by Brian Dean
On Sat, May 21, 2005 at 01:18:32PM -0400, wbounce wrote: > This worked. Excellent! > Now I need to figure out why it happened to prevent it from > happening again. I have to go now but want o run some ideas by you > when I get back. I've heard reports of this type of thing happen
2005-05-21 by Zack Widup
On Sat, 21 May 2005, Robert Adsett wrote: > > OK, I've a couple of alternatives in mind that you may want to take a look at. > > I recently went through looking for rotary position sensors. I was looking > for something rugged since they will end up at the top of a tower with > l
2005-05-21 by wbounce
This worked. Now I need to figure out why it happened to prevent it from happening again. I have to go now but want o run some ideas by you when I get back. -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Brian Dean Sent: F
2005-05-21 by Robert Adsett
At 04:39 PM 5/21/05 +1000, John Samperi wrote: >Thank you for all your replies so far. I guess I will need to explain >a little more. > >I'm trying to come up with some ideas for a prospective client. > > From what I understand so far the valve controls gas to a burner >which nee
2005-05-21 by Brian Dean
Hi John, On Sat, May 21, 2005 at 04:39:06PM +1000, John Samperi wrote: > The valve will be moving a maximum of 1/2 turn, so no high speed > sensors are needed. An Absolute Position sensor would be nice > to have to find if the valve has moved or if the valve motor > has moved in
2005-05-21 by Claxton, Dean J
After Grahams post I thought that might be the safest option - I'm too young to die :-) Appears there is a 5V and a 3.3V regulator in here - I took the risk and used the 15V supply - so far so good. The screen appears to be working fine so far (3 minutes and counting ). Many than
2005-05-21 by Roy E. Burrage
Maybe add a pressure switch, or even a simple sail switch, on the input to ensure there is adequate gas supply and limit switches to indicate full open and full closed for the valve. The reason for the supply switch is we had a customer once who discovered the hard way that inade
2005-05-21 by Bernd Felsche
On Saturday 21 May 2005 14:39, John Samperi wrote: > From what I understand so far the valve controls gas to a burner > which needs to keep a temperature of about 450 degrees celsius > (flaming hot!!) perhaps +- 30 degrees. A Mega16 (possibly) will > be monitoring the thermocoupl
2005-05-21 by John Samperi
Thank you for all your replies so far. I guess I will need to explain a little more. I'm trying to come up with some ideas for a prospective client. From what I understand so far the valve controls gas to a burner which needs to keep a temperature of about 450 degrees celsius (fl
2005-05-21 by Kathy Quinlan
John Samperi wrote: > G'day all > > For a few days Yahoo has bumped off the list it seems... > > I posted the following on AVRfreaks so some of you may see this twice. > I need to know exactly where a stepper motor is positioned at any time. > By Googling I found some potentiomet
2005-05-21 by Robert Adsett
At 10:08 AM 5/21/05 +1000, John Samperi wrote: >I posted the following on AVRfreaks so some of you may see this twice. >I need to know exactly where a stepper motor is positioned at any time. >By Googling I found some potentiometric position sensors, which I guess >will do by fee
2005-05-21 by Roy E. Burrage
What are you controlling John? Could you measure output pressure or some other process variable at the valve rather than absolute position of the actuator? This is often more meaningful information if you're working with a process, rather than simple positioning, as it also allow
2005-05-21 by Larry Barello
Get the real thing, not a digital panel control... www.usdigital.com -----Original Message----- From: John Samperi Sent: Friday, May 20, 2005 5:33 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] [OT a little]Motor Position Sensor At 10:26 AM 21/05/2005, you wrote: >Sounds
2005-05-21 by John Samperi
At 10:26 AM 21/05/2005, you wrote: >Sounds like you mamy want an absolute encoder. Bourns has one that outputs >seven >bit gray code. Check http://www.bourns.com/ rotary encoders for the EAW part. Thanks Bruce I was just looking at that in the Farnell data book (EAW0J-B24-AE0128)
2005-05-21 by Bruce Parham
Lots of folks make encoders. The most common type is the two phase incremental. Some of those come with a third channel to be used as an absolute "zero" reference. Sounds like you mamy want an absolute encoder. Bourns has one that outputs seven bit gray code. Check http://www.bou
2005-05-21 by John Samperi
G'day all For a few days Yahoo has bumped off the list it seems... I posted the following on AVRfreaks so some of you may see this twice. I need to know exactly where a stepper motor is positioned at any time. By Googling I found some potentiometric position sensors, which I gues
2005-05-20 by David Kelly
(think the quoting attribution got messed up due to poor reply formatting) > I ended up opening the supply to have a look inside. Why not look inside the LCD monitor instead. If there is a regulator in its input then its likely all this fuss is moot. > The problem with putting di
2005-05-20 by Brian Dean
On Fri, May 20, 2005 at 06:32:03PM -0000, Ed wrote: > I can figure out how to get the good board to generate the on off > pulse (It is just a matter of doing the math but I do not have the > data sheet with me now.) Does it have to be exactly 1MHZ? No. If you just set your second
2005-05-20 by Brian Dean
On Fri, May 20, 2005 at 05:46:24PM -0000, Graham Davies wrote: > Let's not forget that you don't need the clock running to program > the MCU, or even to correct problems with the fuses, if you have a > JTAG interface. The MAVRIC boards have JTAG headers. The OP could > pick up an
2005-05-20 by Ed
Oh yeah Should I put a current limiting resistor in series on the wire? --- In AVR-Chat@yahoogroups.com, Brian Dean wrote: > On Thu, May 19, 2005 at 11:14:16PM -0400, wbounce wrote: > > > This all started when I tried to program the problem board with an > > updated program. It d
2005-05-20 by Ed
Okay I remember you mentioning this before. Now for some details. I assume I will need to connect both boards to the same power source. ie so they will have common ground. I can figure out how to get the good board to generate the on off pulse (It is just a matter of doing the ma
2005-05-20 by Brian Dean
On Thu, May 19, 2005 at 11:14:16PM -0400, wbounce wrote: > This all started when I tried to program the problem board with an > updated program. It did its usually reading ### 100% and device > signature messages and started on the writing #### part when wheels > on my robot star
2005-05-20 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Brian Dean wrote: > ... setting the fuse bits to > use an external clock ... > When set to use an external > clock, then the chip won't > run and will refuse to be > programmed until an external > clock is provided. Let's not forget that you don't
2005-05-20 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Claxton, Dean J" wrote: > ... There is a current mode PWM > chip on ... the board - M62281FP > ... adjust the output voltage > ... by playing ... What you've probably got here is something like the application circuit at the end of your data shee
2005-05-20 by Claxton, Dean J
Thanks Graham, I ended up opening the supply to have a look inside. There is a current mode PWM chip on the underside of the board - M62281FP (datasheet http://www.ortodoxism.ro/datasheets/MitsubishiElectricCorporation/mXrttz r.pdf ). Unfortunately my electronics knowledge is thi
2005-05-20 by wbounce
Just when I am starting to make headway problems set in. I am using WINAVR 3.4.1 with AVRDude I have a MAVRIC II board. I have a bsd parallel port programmer cable. I have verified the continuity of the cable (the 1st thing I do when I have trouble) and it is fine. I also was abl
2005-05-19 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Claxton, Dean J" wrote: > ... I placed a pair of 1N5404 > diodes in series for ... drop > of around 1.4V (to be on the > safe side ... the diodes get > rather toasty ... This seems to be a reasonable solution to me, assuming you can't find an obv
2005-05-19 by John Mann
Lasse; I am new to the group, but fimiliar with the IAR EWB. I currently have a system I am working on in which I have placed data in both the FLASH and EEPROM on an MEGA128. If you look at the manual and help file for the IAR compiler, they describe multiple ways of forcing data
2005-05-19 by upand_at_them
Can you open it up and look for a regulator? Most power supplies only deliver a ballpark voltage. The device then has a regulator to get it where it needs to be, probably 12V. In which case you wouldn't have to drop the 15V at all. Few devices expect a well-regulated input voltag
2005-05-19 by Claxton, Dean J
Hi, Sorry - a little off topic but... I've got a Dell 1702FP LCD display, but unfortunately to not have the power supply for it. Standard power supply is a 14V @ 3A switch mode brick supply - similar to most laptops etc. I have a Toshiba laptop supply that is 15V @ 3A, and want t
2005-05-18 by Lasse Madsen
Hi All, I'm trying out IAR's embedded workbench version 3.2A for the first time and I've stumbled upon some questions which i hope you can help me with. 1) when you write: printf("Hello World"); It seems (or so i think) that IAR stores the string in RAM rather than in flash why i
2005-05-18 by Reza
Hi; this code may help: in r24,port_address andi r24,3 ldi ZH,hi8(jmp_table) ldi ZL,lo8(jmp_table) or ZL,r24 ijmp NOTE: the jmp_table must aligned on 8 words bounry (three lower address bits must be zero) and contains only rjmp instructions. if the value does not lies in 0..7, us
2005-05-18 by Brian Dean
Also, I'm forwarding Joerg Wunsch's comments for completeness. Joerg's reply to AVR-Chat bounced since he's also not subscribed. Joerg provided the JTAGICE MkII support for avrdude. If you reply, please Cc him directly or the avrdude-dev@nongnu.org mailing list, otherwise he prob
2005-05-18 by Brian Dean
Eric Weddington, maintainer of the WinAVR distribution and the main avrdude Windows developer is not subscribed to AVR-Chat and asked that I forward his reply here. -Brian ----- Forwarded message from "E. Weddington" ----- Date: Tue, 17 May 2005 17:09:56 -0600 From: "E. Weddingto
2005-05-18 by Russell Shaw
Mike Perks wrote: > Brian, > > I sometimes like to use AVRDude as an alternative to AVRProg. However I > have found the following problems continue to exist in even the AVRDude > 5.0 Beta. This is frank input that I hope will spur you to improve AVRDude. > > 1. I tried building m
2005-05-18 by Dave Hylands
Hi Larry, On 5/17/05, Larry Barello wrote: > Anyone know how I can tell GCC linker to skip the C runtime (e.g. crtm128.o) > so I can roll my own specialized version? It's important to not have the main entry point be "main" as this causes a bunch of "extra" stuff to be pulled in.
2005-05-18 by Russell Shaw
Larry Barello wrote: > Anyone know how I can tell GCC linker to skip the C runtime (e.g. crtm128.o) > so I can roll my own specialized version? I think if you compile all the .c files with gcc -c then run the linker separately, the crt file is left out by default. Another way mig
2005-05-18 by Larry Barello
Anyone know how I can tell GCC linker to skip the C runtime (e.g. crtm128.o) so I can roll my own specialized version? TIA
2005-05-18 by Anurag Chugh
I was just wondering .. what about using bridge rectifiers in the car circuit using high current rating diode.. that way u need not worry about polarity.. and i was just wondering.. is the swings/spikes in the car power supply so large and sustained to cause the conduction of the
2005-05-18 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "leon_heller" wrote: > I've just written a simple jump table program using ICALL: Your jump table would be better if it consisted only of addresses as opposed to the call/return. That saves both time and space. I use the GNU assembler (comes with
2005-05-17 by leon_heller
--- In AVR-Chat@yahoogroups.com, "Paul Maddox" wrote: > Leon, > > Thanks, I hadn't spotted that in the instruction set. > Just looking at IJMP, it may be simpler to use, no pushing/pulling from the > stack and its 1 less clock cycle (speed is king)... I've just written a simple j
2005-05-17 by Paul Maddox
Zack, > Yes, I've done it that way (in assembler). I'll have to dig for the > sample code if you want it. i'd like to see it, if you don't mind, thanks. > One thing to do is to make sure you mask off > all but the 3 bits you're going to add to the ZL register. Otherwise it's > po
2005-05-17 by Leon Heller
----- Original Message ----- From: zebjahanw To: AVR-Chat@yahoogroups.com Sent: Monday, May 16, 2005 4:16 PM Subject: [AVR-Chat] *************Hello All****************** Dear friends I am new with AVR's. I want to start with AT89C51 AVR. I have downloaded Studio 4.11 from atmel.c
2005-05-17 by Kathy Quinlan
zebjahanw wrote: > Dear friends > > I am new with AVR's. I want to start with AT89C51 AVR. I have > downloaded Studio 4.11 from atmel.com. I want to program in assembly. > Anyone cuold help me to send me tutorial to do so or web links to > start with. > > Regards and thanks > > Z
2005-05-17 by Paul Curtis
Hi, > I am new with AVR's. I want to start with AT89C51 AVR. I have > downloaded Studio 4.11 from atmel.com. I want to program in > assembly. > Anyone cuold help me to send me tutorial to do so or web > links to start with. That's an 8051, not an AVR. You'll have a hard time prog