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2006-03-30 by aila_alizadeh
hi everybody: does anybody have information about humidity sensors with 2 pin ? I just know that they act as a capacitor ,but I don't know how I should measure it ,and how I should do that with avr . whould you mind sharing your experience about that with me ? If you send me any useful information about measuring & calibrating these sensors and build a hygrometer ,I'll be very thankful. Aila Hasanalizadeh
2006-03-30 by Ned Konz
On Mar 30, 2006, at 1:48 AM, aila_alizadeh wrote: > hi everybody: > does anybody have information about humidity sensors with 2 pin ? > I just know that they act as a capacitor ,but I don't know how I > should measure it ,and how I should do that with avr . > whould you mind sharing your experience about that with me ? > If you send me any useful information about measuring & calibrating > these sensors and build a hygrometer ,I'll be very The best bet for measuring capacitive sensors is to use one of the capacitance-to-analog or capacitance-to-digital converters that are sold for that purpose. QProx QT301 http://www.digikey.com/scripts/DkSearch/dksus.dll? KeywordSearch&Stock=1&Keywords=qt301 AD Capacitance to digital converters http://www.analog.com/en/subCat/0,2879,760%255F1077%255F0%255F%255F0% 255F,00.html You can use other techniques (like for instance a CD4046 PLL) to measure the capacitance, and then use a counter to measure the resultant frequency. Depending on the capacitance, you might also be able to do a really simple converter that charges the cap through a resistor (fed from a digital output pin) and then uses the analog comparator to detect when a threshold voltage has been reached. The time that the cap takes to charge to that level then gives you the capacitance. I don't recommend using the schmitt trigger inputs for this, as their threshold is not necessarily too stable or predictable. If you added an analog switch you could compare the unknown capacitance with a known reference; this helps cancel out microcontroller-based errors. -- Ned Konz ned@bike-nomad.com
2006-03-30 by erikc
aila_alizadeh wrote: > hi everybody: > does anybody have information about humidity sensors with 2 pin ? > I just know that they act as a capacitor ,but I don't know how I > should measure it ,and how I should do that with avr . > whould you mind sharing your experience about that with me ? > If you send me any useful information about measuring & calibrating > these sensors and build a hygrometer ,I'll be very > > thankful. > Aila Hasanalizadeh Go here: http://www.linear.com/designtools/app_notes/index.jsp Look for and download Application Notes AN3 and AN7. Both appnotes show a humidity sensing and signal conditioning circuit. AN3 figure 8 shows a circuit which delivers an analogue voltage, while AN7 figure 11 shows a circuit that delivers a variable frequency. erikc -- GILLETTE'S PRINCIPLE: "If you want to make people angry, lie. If you want to make them absolutely livid with rage, tell the truth."
2006-03-30 by Don Ingram
Hi All, Does anyone have any comments re experiences with debugwire on JTAGII. I am specing a project at present which fits neatly with the Mega8 derivatives but am reluctant to leave the well trodden path with the Mega16 / JTAG family. I see very little history of conversation re debugwire and have little desire to play pioneer ( the guy lying face down in the mud with the arrows in the back ) X-posted to chat & codevision. Cheers Don
2006-03-31 by John Samperi
At 10:06 AM 31/03/2006, you wrote: >X-posted to chat & codevision. ...and avrfreaks?? :-) many threads on JTAGICE 2 there. Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA Tel. (02) 9674-6495 Fax (02) 9674-8745 Email: john@ampertronics.com.au Website http://www.ampertronics.com.au *Electronic Design * Custom Products * Contract Assembly ********************************************************
2006-03-31 by Don Ingram
John Samperi wrote: > At 10:06 AM 31/03/2006, you wrote: >> X-posted to chat & codevision. > > ...and avrfreaks?? :-) many threads on JTAGICE 2 there. > > Regards > > John Samperi Lots on JTAGII in general, sod all on debugwire, well, that I can find anyway ;-) Don
2006-03-31 by John Samperi
At 01:02 PM 31/03/2006, you wrote: >Lots on JTAGII in general, sod all on debugwire, >well, that I can find anyway ;-) Well I'd be happy to test it for you....just send me one :-D I'm still debugging with the old ICE200 which does pretty much all I need to do by enabling the compatibility bits in the 8515 and 8535 chips. For the M8 I can use the 4433 settings if my project does not need the extra ram or I use an 8535 setting with an adaptor cable and use the pins I need off the 8535. Got a JTAG ice mk1(homemade) for the Mega64. You should be able to use the older JTAG with a larger chip to emulate the M48 or M88 (no DW on the Mega8 that I know of) if you don't want to be a guinea pig with debug wire. I guess there would be much more noise on avrfreaks if it didn't work....I'll wait until I cannot do without untill I purchase one...by then all bugs will be sorted out (if any) :-) Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA Tel. (02) 9674-6495 Fax (02) 9674-8745 Email: john@ampertronics.com.au Website http://www.ampertronics.com.au *Electronic Design * Custom Products * Contract Assembly ********************************************************
2006-03-31 by Peter Gargano
Don Ingram wrote: > Does anyone have any comments re experiences with debugwire on JTAGII. Don, I'd be very happy to hear about what you discover (in case your x-posts bear fruit). Peter.
2006-03-31 by Joe
I have used a sht11. This will read temp and humidity and then u can calc Dew point. Serial data out. There is code on the Bascom site. See: http://www.sensirion.com/en/02_sensors/00_products.htm?cat=3&art=1 JoeT PS excuse me if this is posted twice. --- In AVR-Chat@yahoogroups.com, "aila_alizadeh" <aila_alizadeh@...> wrote: > > hi everybody: > does anybody have information about humidity sensors with 2 pin ? > I just know that they act as a capacitor ,but I don't know how I > should measure it ,and how I should do that with avr . > whould you mind sharing your experience about that with me ? > If you send me any useful information about measuring & calibrating
> these sensors and build a hygrometer ,I'll be very > > thankful. > Aila Hasanalizadeh >
2006-03-31 by Shoaib Javed
Yeah, this sensor is a good choice if cost is not an issue. Shoaib
-----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Joe Sent: 31 March 2006 07:13 To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: humidity sensor I have used a sht11. This will read temp and humidity and then u can calc Dew point. Serial data out. There is code on the Bascom site. See: http://www.sensirion.com/en/02_sensors/00_products.htm?cat=3&art=1 JoeT PS excuse me if this is posted twice. --- In AVR-Chat@yahoogroups.com, "aila_alizadeh" <aila_alizadeh@...> wrote: > > hi everybody: > does anybody have information about humidity sensors with 2 pin ? > I just know that they act as a capacitor ,but I don't know how I > should measure it ,and how I should do that with avr . > whould you mind sharing your experience about that with me ? > If you send me any useful information about measuring & calibrating > these sensors and build a hygrometer ,I'll be very > > thankful. > Aila Hasanalizadeh > Yahoo! Groups Links
2006-03-31 by Ivan Vernot
HI Don, I have used debug wire on a Tiny13. It worked well enough (when I it worked) but I am a little disturbed that I have been locked out of a few micros when things go wrong. FWIW here is how it worked for me - need to connect to regular ISP lines. - AVRStudio is told to go into debug wire mode - AVRStudio enter as 'special' ISP mode to set the debug wire fuse bits - Alls well and debug wire works just like JTAG (cool)! BUT Before you exit you debug setting (and AVRStudio) you must remember to clear the debugwire fuse bit. If you don't or AVRStudio crashes or AVRStudio reports that it could not set the debug wire fuse bit (as was my case) then you can get locked out of the micro and regular ISP no longer works nor does debug wire :-( I don't want to appear too negative.as I have not had too much time to look into this as yet (and it is possible that I screwed up something). I have been successfully developing with debug wire for a couple of week with no problems. Then, I need to (in a hurry) make a quick mod for a client and in a flurry of activity I managed to lock myself out of three devices in a row!!!! I have not been able to investigate it further and it does concern me but )(as I said) I was a very happy camper 'till then. I am 'hoping' that I did something stupid in my rush. HTH. BTW: IF I'm not mistaken the mega 16 and the mega8 pin compatible? So you could use the mega16 in development (and use JTAG) and then when its all done recompile for a mega 8. Cheers, Ivan Vernot ----- Original Message -----
From: "Don Ingram" <don@led.com.au> To: <AVR-Chat@yahoogroups.com>; <codevisionavr@yahoogroups.com> Sent: Friday, March 31, 2006 10:06 AM Subject: [AVR-Chat] Debug wire experiences > Hi All, > > Does anyone have any comments re experiences with debugwire on JTAGII. > > I am specing a project at present which fits neatly with the Mega8 > derivatives > but am reluctant to leave the well trodden path with the Mega16 / JTAG > family. > > I see very little history of conversation re debugwire and have little > desire to > play pioneer ( the guy lying face down in the mud with the arrows in the > back ) > > X-posted to chat & codevision. > > Cheers > > Don > > > > Yahoo! Groups Links > > > > > > >
2006-04-01 by Don Ingram
Mega16 is 44 pin, Mega8/Mega168 is 32 pin. Local disti has reported a number of companies routinely using debugwire, he didn't mention the lockout issue although. Given the need to have to use the SPI lines for programming anyway I am leaning toward the well trodden JTAG solution. I would like to use a much smaller device but feature creep has begun & Mega8 class is the minimum family so Mega16 is a short hop away & cost is not an issue... Cheers Don Ivan Vernot wrote: > HI Don, > I have used debug wire on a Tiny13. > > It worked well enough (when I it worked) but I am a little disturbed that I > have been locked out of a few micros when things go wrong. > > FWIW here is how it worked for me > - need to connect to regular ISP lines. > - AVRStudio is told to go into debug wire mode > - AVRStudio enter as 'special' ISP mode to set the debug wire fuse bits > - Alls well and debug wire works just like JTAG (cool)! > > BUT > Before you exit you debug setting (and AVRStudio) you must remember to clear > the debugwire fuse bit. > If you don't or AVRStudio crashes or AVRStudio reports that it could not set > the debug wire fuse bit (as was my case) then you can get locked out of the > micro and regular ISP no longer works nor does debug wire :-( > > I don't want to appear too negative.as I have not had too much time to look > into this as yet (and it is possible that I screwed up something). > > I have been successfully developing with debug wire for a couple of week > with no problems. Then, I need to (in a hurry) make a quick mod for a client > and in a flurry of activity I managed to lock myself out of three devices in > a row!!!! > > I have not been able to investigate it further and it does concern me > but )(as I said) I was a very happy camper 'till then. > I am 'hoping' that I did something stupid in my rush. > > HTH. > > BTW: IF I'm not mistaken the mega 16 and the mega8 pin compatible? So you > could use the mega16 in development (and use JTAG) and then when its all > done recompile for a mega 8. > > Cheers, > > Ivan Vernot > > > > > > ----- Original Message ----- > From: "Don Ingram" <don@led.com.au> > To: <AVR-Chat@yahoogroups.com>; <codevisionavr@yahoogroups.com> > Sent: Friday, March 31, 2006 10:06 AM > Subject: [AVR-Chat] Debug wire experiences > > >> Hi All, >> >> Does anyone have any comments re experiences with debugwire on JTAGII. >> >> I am specing a project at present which fits neatly with the Mega8 >> derivatives >> but am reluctant to leave the well trodden path with the Mega16 / JTAG >> family. >> >> I see very little history of conversation re debugwire and have little >> desire to >> play pioneer ( the guy lying face down in the mud with the arrows in the >> back ) >> >> X-posted to chat & codevision. >> >> Cheers >> >> Don >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> >> > > > > > Yahoo! Groups Links > > > > > > > > -- Cheers Don Ingram Leading Edge Design Mob: +61 4 1877 5670 Ph : +61 7 4942 5670 SIP: 899 060 4942 5670 Fax: +61 7 4942 5680 23 Daniel St North Mackay QLD 4740 Australia P.O. Box 10326 Mt Pleasant QLD 4740 Australia
2006-04-01 by John Samperi
At 10:46 AM 1/04/2006, you wrote: >IF I'm not mistaken the mega 16 and the mega8 pin compatible? M168 (?) and M8 are pin compatible. M16 is a 40 pin (44 smd) device :-) I'm sure you know that, a slip of the fingers? :-) Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA Tel. (02) 9674-6495 Fax (02) 9674-8745 Email: john@ampertronics.com.au Website http://www.ampertronics.com.au *Electronic Design * Custom Products * Contract Assembly ********************************************************
2006-04-02 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, John Samperi <samperi@...> wrote: > > M168 (?) and M8 are pin compatible. ...so are M48 and M88. It's nice to be able to use a PCB for a whole series (M8, M48, M88, M168) of processors. Scroll down to the last entry on this page for an example: http://www.raketenmodellbau.org/forum? action=viewthread&page=3&threadid=5566
2006-04-19 by naveed mughal
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2006-04-19 by Ned Konz
On Apr 19, 2006, at 4:04 AM, naveed mughal wrote: > i m doing final project on avrora, my task is to extend avrora. > first i have to know that what devices are supported by avrora- > beta-1.6.0... > i'll be very thankfull if u help ... Didn't you believe the page on supported microcontrollers on the Avrora web site? I found it by searching for avrora supported devices http://compilers.cs.ucla.edu/avrora/extend/mcu.html where they say: --- A microcontroller in Avrora is a self-contained execution unit with program storage, RAM and internal devices that represents a complete execution unit to be simulated. A microcontroller may be connected to external devices such as LEDs, but these are not considered part of the microcontroller. For example, the ATMega128L contains 128KB Flash, 4KB EEPROM, 4KB SRAM, several timers, two UARTs, an SPI interface, etc. Avrora allows you to add your own microcontroller model, for Atmel microcontrollers not yet supported or not yet build. By creating a new Java class that implements the Microcontroller interface, you can build a software model of the microcontroller in which your program will run. You can add the correct parameters for storage size, external pin assignments, and internal devices. By specifying the -chip option to the simulator, you can select from one of the supported microcontrollers, or specify the fully qualified name of your own microcontroller class. --- So the answers to your question are "the microcontrollers that are supported are represented by classes that implement the Microcontroller interface", and "you can make your own Microcontroller class if you need or want to". Just look at the source code; the JavaDoc is online. http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ Microcontroller.html http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ AtmelMicrocontroller.html http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ ATMegaFamily.html http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ ATMega128.html http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ ATMega16.html http://compilers.cs.ucla.edu/avrora/api/current/avrora/sim/mcu/ ATMega32.html After all, you're going to have to read the source in order to extend Avrora, right? -- Ned Konz MetaMagix embedded consulting MetaMagix@gmail.com
2006-04-20 by naveed mughal
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2006-04-20 by naveed mughal
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2006-04-20 by Jim Wagner
You are not likely to get much help with avrora here. I've never seen anybody refer to it on this list. Of course, you are welcome to ask, but please don't be upset if nobody answers! I have also never seen it referred to on the avrfreaks list. There are a lot more folks there, however, so the odds of finding someone might be a little better. Jim --------------------------------------------------------------- The Think Different Store http://www.thinkdifferentstore.com/ For All Your Mac Gear ---------------------------------------------------------------