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2007-06-14 by Richard Cooke
Hi Folks, Sorry for this off-topic post but I've run out of ideas. Does anybody know where I can get 10 to 20 pieces of a 12MHz SMD crystal with Cload of less than 16pF, ESR less than 100 ohms and a frequency tolerance of better than +/- 60 ppm? Digi-key has one (#644-1018-1-ND)
2007-06-14 by Phillip Vogel
Maybe I'm kind of late here, but have you looked at the Procyon AVRlib? I believe it has all the stuff you're looking for. http://hubbard.engr.scu.edu/embedded/avr/avrlib Phillip _____ From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of briangregory82 Se
2007-06-14 by Jim Wagner
doubly bad... Your accuracvy in this situatioh will be dominated by the voltage divider. You will have to pay a lot of money to get 0.1% resistors which is about what you would need to get the accuracy contribution of the divider equal to the accuracy of a 10 bit ADC with perfect
2007-06-14 by Robert Adsett
At 06:04 PM 6/13/2007 -0700, mago Umandam wrote: >Yes, what i need ti accuray. Well, i opted higher resolution since the >voltage im measuring is of high range 0-80 V. i assume higher resolution >will give better accuracy. Bad assumption. To get higher accuracy you need a lot mor
2007-06-14 by mago Umandam
Yes, what i need ti accuray. Well, i opted higher resolution since the voltage im measuring is of high range 0-80 V. i assume higher resolution will give better accuracy. regards, mago "Roy E. Burrage" wrote: Do you really need accuracy or do you actually need resolution? With 16
2007-06-13 by Roy E. Burrage
Do you really need accuracy or do you actually need resolution? With 16 bits, your least significant bit will be just over 15 microvolts for a 1 volt full scale input. This would equate to 45 microvolts at 2.5 volts FS. At the very least, way down in the mud for most applications
2007-06-13 by Ralph Hilton
On Wed, 13 Jun 2007 01:50:30 -0000 you wrote: > >The internal ADC of my mega16 is 10 bit. But i want a more accurate >one. about 16 bit or better. Anyone can suggest a 16 bit ADC with >either SPI or i2c interface. seem some from TI but i want to consider >suggestion first before
2007-06-12 by magzky02
The internal ADC of my mega16 is 10 bit. But i want a more accurate one. about 16 bit or better. Anyone can suggest a 16 bit ADC with either SPI or i2c interface. seem some from TI but i want to consideer suggestion first before deciding. the IC should run at 3.3V. regards mago
2007-06-12 by kernels_nz
Hi Andy, Thats awesome information, thanks heaps, I see they sell on the NZ version of EBAY for Around US$15, cant wait to give it a go. For anyone following this thread, it appears that with just about any cheap webcam or digital camera, you can extract and desolder the CMOS sen
2007-06-12 by Reza
--- Sandu Teo wrote: > Hello > > I am working at a sonar sistem . > When the sensor detects something, a response is > sent to the mirocontroller on PORTC.2 > I have enabled PCINT10 which works on that pin. > > I send some pulses on PORTC.0 and I start TIMER0 > and after that ,I
2007-06-12 by Reza
--- Sandu Teo wrote: > Hello > > I am working at a sonar sistem . > When the sensor detects something, a response is > sent to the mirocontroller on PORTC.2 > I have enabled PCINT10 which works on that pin. > > I send some pulses on PORTC.0 and I start TIMER0 > and after that ,I
2007-06-12 by filipesbp@sapo.pt
You sould check what controler the LCD have.. in my case i have a T6963 controler, and there is in avrfreaks some library's that you could use. Citando David Kelly dkelly@hiwaay.net[1]: > > > On Mon, Jun 11, 2007 at 10:34:49AM -0700, Ken Holt top-posted: > > Many of the new compl
2007-06-12 by mikanradojevic
Hello, I have some avr gcc code for 12864 graphics lcd. In general there are two files: glcd.h & glcd.c. I hope that it can help to You. glcd.h : //---------------------------------------------------- // // glcd.h //---------------------------------------------------- #ifndef LCD
2007-06-12 by mikanradojevic
--- In AVR-Chat@yahoogroups.com, "mailtofalcon" wrote: > > hi > i design a device which monitor the level of a huge tank with avr > atmega8535 and show a historical trend for this level but i need now > to make a graph for this level values can any one help me how to use > the gr
2007-06-12 by Andy Clark
You could try the GameBoy camera, check out my old pages (if they still work) at... http://pages.zoom.co.uk/andyc/ It has digital control but an analog output. You can (pretty much) clock the data out at any rate although bear in mind that frame exposure is a function of clock sp
2007-06-12 by Dao Viet Dung
Hi, Check this link: http://www.8052.com/codelib/lcd12864.rar if it can help you. Regards. Dao mailtofalcon wrote: hi i design a device which monitor the level of a huge tank with avr atmega8535 and show a historical trend for this level but i need now to make a graph for this le
2007-06-11 by kernels_nz
Thanks everyone for the great ideas, I will look into them, It looks like at this stage ill buy some cheap cameras and take them apart to try and see what type of CMOS image sensor they use and whether I can interface to this sensor directly. The line-scan cameras we use @ work a
2007-06-11 by David Kelly
On Mon, Jun 11, 2007 at 10:34:49AM -0700, Ken Holt top-posted: > Many of the new complex LCDs are an extreme pain to get > initialized properly, especially getting the multiple DC-DC converters > going, when the data sheets are wrong or incomplete, or poorly > translated. The P/N
2007-06-11 by Samir Lohani
For an ARM based implementation using a digital still video source, see my project "Video Frame Grabber" among the DE entries of Luminary ARM contest. The URL is http://www.circuitcellar.com/designstellaris2006/winners/DE/LM1719.htm Cheers, Samir. --- Jim Wagner wrote: > On Mon,
2007-06-11 by Ken Holt
Many of the new complex LCDs are an extreme pain to get initialized properly, especially getting the multiple DC-DC converters going, when the data sheets are wrong or incomplete, or poorly translated. Ken np np wrote: > A datasheet on the device would be a good start. > > LCD's
2007-06-11 by Ken Holt
You may already know that almost all CMOS sensor chips and modules provide a digital output only, through a variety of serial I/Fs. Ken kernels_nz wrote: > Hi guys, I have a curly one, any creative suggestions would be > appreciated. > > Im interested in digitzing a B/W video wav
2007-06-11 by np np
A datasheet on the device would be a good start. LCD's usually have an initialisation sequence. Make sure the timing is correct as some LCD's need delays between the first few bytes to them. Once the LCD is initialised you can set about drawing graphs and text on them. On a purel
2007-06-11 by Zack Widup
It took me less than a minute to find the data sheet for this display using Google. It appears all the data to do this is in the data sheet. Isn't that what you're getting paid to do? Zack On Sun, 10 Jun 2007, mailtofalcon wrote: > hi > i design a device which monitor the level o
2007-06-11 by BobGardner@aol.com
> Any other ideas? ============================================ The first frame grabbers were programmed io from the parallel port.... wait for vert sync, wait for the line you want, grab a line. If the picture is fairly steady, should be able to get the next line every field...
2007-06-11 by Bruno Muswieck
Hi Hein. I'm thinking that is two ways that you could take. 1 - You should pick an faster ADC and even that, you should use an integer to get less pixels so less faster should be your read from the camera signal. 2 - There are some equipaments that has an camera and an processor
2007-06-11 by Sandu Teo
Hello I am working at a sonar sistem . When the sensor detects something, a response is sent to the mirocontroller on PORTC.2 I have enabled PCINT10 which works on that pin. I send some pulses on PORTC.0 and I start TIMER0 and after that ,I wait for response on PORTC.2 I have an
2007-06-11 by Jim Wagner
On Mon, 11 Jun 2007 02:48:22 -0000 "kernels_nz" wrote: > Hi guys, I have a curly one, any creative suggestions > would be > appreciated. > > Im interested in digitzing a B/W video waveform from a > standard CMOS > security camera, im only really interested in one line of > video
2007-06-11 by dlc
You're looking at using a dedicated ADC chip here. The fastest ones are parallel out, but the newer SPI based ones are also pretty fast. DLC kernels_nz wrote: > Hi guys, I have a curly one, any creative suggestions would be > appreciated. > > Im interested in digitzing a B/W vide
2007-06-11 by kernels_nz
Hi guys, I have a curly one, any creative suggestions would be appreciated. Im interested in digitzing a B/W video waveform from a standard CMOS security camera, im only really interested in one line of video but the conversion time of the average AVR A2D is around 13-50us but th
2007-06-10 by mailtofalcon
hi i design a device which monitor the level of a huge tank with avr atmega8535 and show a historical trend for this level but i need now to make a graph for this level values can any one help me how to use the graphical lcd 12864 thanks
2007-06-07 by David VanHorn
On 6/7/07, A F wrote: > Whoever said ground issue, you win the secret prize. Im using an stk500 which has a diode on ground for reverse polarity protection. Sure would be nice if the users guide mentioned something about that. So I moved the breadboard ground from the bench suppl
2007-06-07 by A F
Whoever said ground issue, you win the secret prize. Im using an stk500 which has a diode on ground for reverse polarity protection. Sure would be nice if the users guide mentioned something about that. So I moved the breadboard ground from the bench supply to the stk board and a
2007-06-06 by Bruno Muswieck
Hi. Codevision's help you have some explanation about how to use the AD and how to configure it. --- In AVR-Chat@yahoogroups.com, haben jemal wrote: > > hi i wanted help in using codevision > still new with it can somebody tell how to make a simple adc converter in codevision for
2007-06-05 by haben jemal
hi i wanted help in using codevision still new with it can somebody tell how to make a simple adc converter in codevision for mega8535 chip and a simple resource for codevision and example programs thanks --------------------------------- Shape Yahoo! in your own image. Join our
2007-06-05 by enkitec@gmail.com
On 5 Jun 2007 at 11:01, A F wrote: > could letting the adc input exceed aref cause damage that would manifest in this manner? > My experience with the ATMega48 ADC tells me the following: - The ADC reading starts at zero again when the input voltage is higher than AREF voltage. -
2007-06-05 by A F
The stk500 and my breadboard are both driven from my bench supply so the ground should be good. I am using the adc on port c pin 4. It is being driven directly by an LM34 temp sensor or a pot for testing so I think the impedence is low. the alternate function for this pin is sda
2007-06-05 by David VanHorn
> Buffering your analog signal could solve that problem ! I always R/c filter analog inputs, with a knee just a bit faster than I expect the signal to rationally change. This happens right at the chip, so the AC impedance is rather low. I try HARD to have the DC sourcing resistan
2007-06-05 by BobGardner@aol.com
I recall having that problem on a mega128... the jtag is on porta with the a/d... 1st 4 channels worked fine.... turn off jtag by writing MCUCSR=0x80; TWICE. Write back if this was the problem! ************************************** See what's free at http://www.aol.com. [Non-tex
2007-06-05 by David VanHorn
On 6/4/07, Jim Wagner wrote: > Some devices allow interrnal pullup to remain on in ADC > mode. Check that pullups, etc, are off on those pins. That could well be it, or the sourcing impedance is too high on whatever is driving the pins. There is a certain amount of leakage curren
2007-06-04 by kernels_nz
I can agree with David on this one, I recently used a A2D on a Atmel ARM7 microcontroller and got really noisy results. Looked at the analog waveform with my scope and noticed that everytime the A2D did a sample-and-hold, the voltage dropped by around 0.2V on a 2V signal, all due
2007-06-04 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "briangregory82" wrote: >I'm looking at AVR305 and it might be exactly what I'm looking for. One aspect of the AVR305 method that may be unpalatable is that it utilizes the external interrupt functionality for start bit detection. This means eithe
2007-06-04 by Jim Wagner
Some devices allow interrnal pullup to remain on in ADC mode. Check that pullups, etc, are off on those pins. Jim On Sun, 3 Jun 2007 20:17:17 -0700 (PDT) A F wrote: > Im using the adc on a mega8 with a 5v LM4050 precision > shunt as an external reference. I am able to read the >
2007-06-04 by BobGardner@aol.com
Yes, you are correct and closer inspection does reveal that it is tied to the capture pin. Oh well. I'm looking at AVR305 and it might be exactly what I'm looking for. Brian Gregory ===================================================== Software uarts can trade off complexity and
2007-06-04 by briangregory82
--- In AVR-Chat@yahoogroups.com, "Don Kinzer" wrote: > > I suspect that you're referring to the Procyon avrlib as opposed to > avrlibc that comes with avr-gcc. [...] Yes, you are correct and closer inspection does reveal that it is tied to the capture pin. Oh well. I'm looking at
2007-06-04 by murugesan kudiyarasu
hai.. 1. Try to capture the noise in the oscilloscope ,the noise depend on the design of acd circuit ,so it may have chance to show zero, 2. make ground for unused channels of ADC.it may stop oscillation in output. --- A F wrote: > Im using the adc on a mega8 with a 5v LM4050 > p
2007-06-04 by Roy E. Burrage
How are your "grounds" Aaron? If your return lines are at some different potential you'll have errors such as this. Sometimes it's better to have a differential amplifier on the input to alleviate this problem. REB A F wrote: >Im using the adc on a mega8 with a 5v LM4050 precisio
2007-06-04 by Teo
Hello, I am worikng on a robot used for room mapping. Can you give me some advice about the algorithm, because there is a problem. I try to implement a recursive function that searches all free locations in the room. The problem is that I will sure receive a stack overflow messag
2007-06-04 by Dao Viet Dung
Absolutely, you did something wrong. Plz check you schematic and PCB. Regards. Dao A F wrote: Im using the adc on a mega8 with a 5v LM4050 precision shunt as an external reference. I am able to read the full scale of 0 to 1023, the problem is that 0 is returned for any voltage un
2007-06-04 by A F
Im using the adc on a mega8 with a 5v LM4050 precision shunt as an external reference. I am able to read the full scale of 0 to 1023, the problem is that 0 is returned for any voltage under about 0.84v. Is this a limitation of the adc or am I doing something wrong? thanks --Aaron
2007-06-04 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "briangregory82" wrote: > Apparently avrlibc has a software UART > implementation. Are you familiar with it? I suspect that you're referring to the Procyon avrlib as opposed to avrlibc that comes with avr-gcc. I've only looked at it briefly. It is