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2012-10-26 by David VanHorn
There are a number of possibilities. 10k is not the ideal source impedance, it is the maximum recommended source impedance. Lower is better. The I/O pins on most AVRs can have up to 1uA leakage to VCC or GND. (see above) The internal AREF voltages on the AVRs are not very accurat
2012-10-26 by Jim Wagner
That should be good, then. Jim Wagner On Oct 26, 2012, at 9:37 AM, Dave McLaughlin wrote: > Hi Jim, > > I have an inductor in series with the main 5V supply with a 0.1uF cap either > side of the inductor so there is a bypass on Vref. I use this same exact > setup with the isolate
2012-10-26 by Dave McLaughlin
Hi Jim, I have an inductor in series with the main 5V supply with a 0.1uF cap either side of the inductor so there is a bypass on Vref. I use this same exact setup with the isolated ADC I also have on the design and any other design I use and it works well. AVcc is fed from the s
2012-10-26 by Mauro Zanin
Ciao test the reference for stability. I use reference generator diodes, very stable and decoupling it from DC source. Mauro Zanin Logic Data > To: AVR-Chat@yahoogroups.com > From: wagnejam99@comcast.net > Date: Fri, 26 Oct 2012 08:49:04 -0700 > Subject: Re: [AVR-Chat] Apparent n
2012-10-26 by Jim Wagner
How have you supplied AVcc? What are you using for reference? Does the reference have a bypass capacitor? Jim Wagner Oregon Research Electronics On Oct 26, 2012, at 8:03 AM, Dave McLaughlin wrote: > Hi all, > > I have an ATMEGA32 and I am using the ADC to measure the power supply
2012-10-26 by Dave McLaughlin
Hi all, I have an ATMEGA32 and I am using the ADC to measure the power supply that is connected to the device. Having done a similar thing with other processors, I am stumped by what I am seeing with the AVR device. I have a potential divider on the input so that I can measure up
2012-10-18 by Clark Martin
On Oct 17, 2012, at 8:38 PM, R E Purcella wrote: > the Atmel documentation calls for higher value pull up or pull down > resistors, usually 20K. however 10K work fine. But 1K is a bit low. Unless the AVR pin is driving the resistor, high or low, it doesn't matter to the AVR how l
2012-10-18 by R E Purcella
the Atmel documentation calls for higher value pull up or pull down resistors, usually 20K. however 10K work fine. But 1K is a bit low. I'm still not understanding what noise you are having. If it is digital in nature is it noise?, or Do you have your external interrupt being tri
2012-10-15 by Elham B
1k,,yes it's digital ________________________________ From: farshid alipour To: AVR-Chat@yahoogroups.com Sent: Monday, October 15, 2012 12:21 AM Subject: Re: [AVR-Chat] noise problem how much is it ?if the resistor is too big noise can effect on it .are you sure the out put of th
2012-10-14 by farshid alipour
how much is it ?if the resistor is too big noise can effect on it .are you sure the out put of the module is digital ? --- On Sun, 10/14/12, Elham B wrote: From: Elham B Subject: Re: [AVR-Chat] noise problem To: "AVR-Chat@yahoogroups.com" Date: Sunday, October 14, 2012, 11:38 PM
2012-10-14 by Elham B
i use pull-down resistor ________________________________ From: farshid alipour To: AVR-Chat@yahoogroups.com Sent: Sunday, October 14, 2012 11:26 PM Subject: Re: [AVR-Chat] noise problem have you used pull-up or pull-down resistor on the interrupt pin ? [Non-text portions of this
2012-10-14 by farshid alipour
have you used pull-up or pull-down resistor on the interrupt pin ? [Non-text portions of this message have been removed]
2012-10-14 by Bob Paddock
On Thu, Oct 11, 2012 at 6:08 PM, bayramdavies wrote: > Yes, it is extensively used in digital circuits too, but it's a bad idea. The analysis that proved to me that it was a bad idea was done in the context of using surface-mount ceramic chip capacitors in the bypassing of digita
2012-10-14 by David V
Larger caps can still have relatively large impedance. I wouldn't try to bypass my 2GHz radios with a 0.1uF. Critical also is the routing. I try hard to have the power come to the pad and then away from the pad, not a "T" connection that runs down to the pad. Little things like t
2012-10-13 by hamidreza
dear i want to read data from a SD card. i can initialize card successfully. but when i read the OCR with CMD58, i see 0x00 0x00 0x00 0x00 when i want read a sector i get data token (0xfe) but i read all the sector 0xff please help
2012-10-12 by Leon
--- In AVR-Chat@yahoogroups.com, "bayramdavies" wrote: > > --- In AVR-Chat@yahoogroups.com, Zack Widup wrote: > > > .. bypass the power ... with several > > capacitors in parallel - maybe a few > > microfarads in parallel with a 1000 > > pF and a 10 pF. > > Using different values
2012-10-11 by bayramdavies
Zack, Yes, it is extensively used in digital circuits too, but it's a bad idea. The analysis that proved to me that it was a bad idea was done in the context of using surface-mount ceramic chip capacitors in the bypassing of digital circuits. I don't know if there are other consi
2012-10-11 by Jim Wagner
That was my point - to determine the origin of the interrupt signal. Jim Wagner ----- Original Message ----- From: "David VanHorn" To: AVR-Chat@yahoogroups.com Sent: Thursday, October 11, 2012 8:26:06 AM Subject: Re: [AVR-Chat] noise problem On Wed, Oct 10, 2012 at 2:59 PM, Jim W
2012-10-11 by David VanHorn
On Wed, Oct 10, 2012 at 2:59 PM, Jim Wagner wrote: > What happens if you disconnect the output of your sensor from the MCU board. Then, look at the ultrasonic output with your scope. Is the pulse there or not there? It may be that the problem is entirely in the sensor! It is enti
2012-10-11 by Zack Widup
Hmm ... this technique is extensively used in UHF and microwave circuits. You will often see two or three bypass capacitors of different values at each point where a power lead or trace approaches an active device. Zack On Thu, Oct 11, 2012 at 7:59 AM, bayramdavies wrote: > ** >
2012-10-11 by bayramdavies
--- In AVR-Chat@yahoogroups.com, Zack Widup wrote: > .. bypass the power ... with several > capacitors in parallel - maybe a few > microfarads in parallel with a 1000 > pF and a 10 pF. Using different values of capacitors in parallel for high-frequency bypass is not a good idea.
2012-10-10 by Jim Wagner
What happens if you disconnect the output of your sensor from the MCU board. Then, look at the ultrasonic output with your scope. Is the pulse there or not there? It may be that the problem is entirely in the sensor! Jim Wagner ----- Original Message ----- From: "Elham B" To: AVR
2012-10-10 by Elham B
you offer to using 1000pf & 10pf capacitor in my circuit? ________________________________ From: Zack Widup To: AVR-Chat@yahoogroups.com Sent: Wednesday, October 10, 2012 11:30 PM Subject: Re: [AVR-Chat] noise problem Hi Elham, There are several things that may be causing the pro
2012-10-10 by Elham B
i see waveform in the oscilloscope,,,there is pulse on pinD.3 ________________________________ From: Zack Widup To: AVR-Chat@yahoogroups.com Sent: Wednesday, October 10, 2012 11:30 PM Subject: Re: [AVR-Chat] noise problem Hi Elham, There are several things that may be causing the
2012-10-10 by Zack Widup
Hi Elham, There are several things that may be causing the problem and several things you can do to try to prevent it. I am assuming that the motor draws a fair amount of current, since you're driving it with some fairly good-sized FET's. I would not acquire the voltage to power
2012-10-10 by Elham B
an ultrasonic module connected to interrupt, i upload the attachment into the photos,,, in this circuit dc motor connected to micro,,if output of ultrasonic pull down the INT1 ,dc motor running...but the interrupt is getting interrupted unintentionally by the noise what's happeni
2012-10-10 by Zack Widup
I am guessing he means by "operating uncaused" that the interrupt is getting interrupted unintentionally by the noise, i.e. what is supposed to cause the interrupt is not what is causing it. Also, yes, I think he means driving a DC motor. If there's a motor involved, there's like
2012-10-10 by Jim Wagner
There is not enough information to provide any help. What is PD3 connected to? Why do you have an interrupt for PD3? What do you mean by "operating uncaused"? Every action must have a cause! What do you mean by "driving a dc motor in the interrupt"? (I assume you mean driving ins
2012-10-09 by Elham B
noise!!! my project is with micro avr,atmega32. pinD.3 , external interrupt ,operating uncaused!! because of noise!! I deriving a dc motor in the interrupt , i using capacitors in every where that was nesseccery for solving this problem... pleesssee help meeeee :-( what can i do?
2012-10-09 by John Samperi
At 01:53 PM 9/10/2012, you wrote: >Atmel is taking registration for their annual tech tour In case you don't get emails from Atmel I posted some details on AVRfreaks. http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=125030&highlight=tour Registration page http://
2012-10-09 by Philippe Habib
Atmel is taking registration for their annual tech tour and if you have a free day, I really recommend it. You get a day of good hands on exposure and at the end of the day you take home the JTAG debugger and a dev board of too. All for $100 and they feed you too. I'm going to ha
2012-10-08 by hamidreza maddah
what is the compiler that you are using from it? HamidReza ________________________________ From: Elham B To: AVR-Chat@yahoogroups.com Sent: Friday, October 5, 2012 10:55 PM Subject: [AVR-Chat] I2C i have a compass module that need i2c mode for communicate with micro,,i work with
2012-10-07 by Elham B
thank you jeff ________________________________ From: Jeffrey Engel To: "AVR-Chat@yahoogroups.com" Sent: Sunday, October 7, 2012 7:41 PM Subject: Re: [AVR-Chat] I2C Elham, If you're goiing to use Google, remember to search for 'TWI', not i2c. You should get plenty of example code
2012-10-07 by Jeffrey Engel
Elham, If you're goiing to use Google, remember to search for 'TWI', not i2c. You should get plenty of example code from the 'Net. HTH, Jeff Happiness is - positive intake manifold pressure. ________________________________ From: Elham B To: AVR-Chat@yahoogroups.com Sent: Friday,
2012-10-07 by shahab aghai
hi hope it helps. On Fri, Oct 5, 2012 at 10:55 PM, Elham B wrote: > ** > > > i have a compass module that need i2c mode for communicate with micro,,i > work with avr,,i don't know what i have too do...please help me,,,please > give me a sample project that use i2c mode > > > [Non
2012-10-07 by Jim Wagner
There are Atmel application notes and there are tutorials on the AVRFreaks web site. Jim Wagner On Oct 5, 2012, at 12:25 PM, Elham B wrote: > i have a compass module that need i2c mode for communicate with micro,,i work with avr,,i don't know what i have too do...please help me,,
2012-10-05 by Elham B
i have a compass module that need i2c mode for communicate with micro,,i work with avr,,i don't know what i have too do...please help me,,,please give me a sample project that use i2c mode
2012-10-03 by Philippe Habib
Thanks for taking the time to pass on what you learned. I talked to the Jungo people and they said I could buy their dev kit and use their driver, but I think the cost was about $3k. As you said, there doesn't seem to be a way to build on Atmel's interface without that. As it hap
2012-10-03 by Marc R.J. Brevoort
Hi, > I just wanted to post these Groups for anyone here that is > also into CPLDs or FPGAs Programming hardware and software. Although technically you're slightly off-topic, may I thank you for these links. I'm not into CPLD/FPGA programming yet but want to get into it, so I'm s
2012-10-02 by Philippe Habib
Actually, what I needed was a 0-10V analog signal to drive a commercial dimmable LED driver module. The requirement was to drive 4 of these with up to 50ma. I was leaning toward a quad SPI DAC and then a simple amplifier using a FET, but the project was put on hold for a few mont
2012-10-02 by Jim Wagner
The original poster does not require either a filter or an amplifier. A simple NMOS FET switch will do it. SImply PWM drive the switch in the ground lead of the LED., Run the PWM frequency (the PWM repetition frequency, not the counter clock frequency) anything greater than 100Hz
2012-10-02 by Gerry
Hey folks, It's been a while since I've been in here....My AVR gear is still on my Bench awaiting for me to Dive in and mess around with it. I just wanted to post these Groups for anyone here that is also into CPLDs or FPGAs Programming hardware and software. For Xilinx: http://t
2012-10-01 by raoul.palma
--- In AVR-Chat@yahoogroups.com, Philippe Habib wrote: > > I need to generate a 0-10V signal to control some dimmable LED drivers. I know I could do it with a DAC, but I think I might be able to save a part by generating a PWM signal and smoothing it out with a capacitor to make
2012-10-01 by raoul.palma
--- In AVR-Chat@yahoogroups.com, Philippe Habib wrote: > > I'm looking at App Note AVR069, which mentions licensing and using the Jungo driver to talk to the AVRISP. Has anyone done this? Is there any sample code available? From the Jungo web site, it seems like WindDriver is wha
2012-09-26 by John Samperi
At 10:05 PM 26/09/2012, you wrote: >I understand that MicroSoft is ending support for XP soon, >but could you clarify what you mean by the "demise of win XP", please? It will be similar to what happened when win 98 stopped being supported. I had to upgrade my laptop to win XP as
2012-09-26 by David Kelly
On Sep 26, 2012, at 7:15 AM, bayramdavies wrote: > The poll specifically asks "What version of Studio .. is most reliable?" Reliability is important to me, so, yes, I think there is a point. Even though I hate the sluggishness of AS6 and don't want to have to re-learn how to use
2012-09-26 by bayramdavies
--- In AVR-Chat@yahoogroups.com, John Samperi wrote: > Is there a POINT to this? Does it > matter what we think or what Atmel > thinks is the future direction? The poll specifically asks "What version of Studio .. is most reliable?" Reliability is important to me, so, yes, I thin
2012-09-26 by bayramdavies
--- In AVR-Chat@yahoogroups.com, John Samperi wrote: > ... with the upcoming demise of win XP ... I understand that MicroSoft is ending support for XP soon, but could you clarify what you mean by the "demise of win XP", please? I have been planning to continue to use XP indefinit
2012-09-25 by Jim Wagner
I suspect that it is possible but not easy. They are text files. Jim Wagner On Sep 24, 2012, at 5:13 PM, R E Purcella wrote: > is it possible for users to update the definition files? > > rep > On 9/24/2012 3:24 PM, Jim Wagner wrote: > > > > There will be "problems" as new device
2012-09-25 by R E Purcella
is it possible for users to update the definition files? rep On 9/24/2012 3:24 PM, Jim Wagner wrote: > > There will be "problems" as new devices are introduced and definition > files for 4.xx are not updated. > > Jim Wagner > Oregon Research Electronics > > ----- Original Message