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2010-02-18 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of blue_eagle74 Sent: 18 February 2010 02:14 To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: small sd card > Well, I guess standard SD cards for cameras and such. > Wanted to
2010-02-18 by blue_eagle74
Well, I guess standard SD cards for cameras and such. Wanted to use the SPI fuction of the card instead of the 4 bit mode. I have one made by Panasonic, 256M, not sure if this has the spi option. There is a guy sending me one that is 128M. I initally wanted a small one like a 16M
2010-02-16 by kelvin kooger
Hi, Please provide the technical specification of the memoy you are looking for. --- On Sun, 2/14/10, blue_eagle74 wrote: From: blue_eagle74 Subject: [AVR-Chat] Re: small sd card To: AVR-Chat@yahoogroups.com Date: Sunday, February 14, 2010, 2:24 AM That is a good point. And I wil
2010-02-14 by H. Carl Ott
On Sat, Feb 13, 2010 at 8:14 PM, blue_eagle74 wrote: > > Does anyone have an old SD Memory card of 16M to 256M memory card you want > to > sell? I was wanting to use it with a micro. I have looked around and havent > found one. The smallest in the stores are 2G. Let me know what
2010-02-14 by Philippe Habib
If you're going to use that kind of memory, one thing to watch for is the quality of the memory you buy. One client used it to keep the error log for a $1M piece of equipment. All was fine until the purchasing department bought consumer level cards instead of pricier industrial q
2010-02-14 by blue_eagle74
That is a good point. And I will consider it. but I am just learning for now. Thank you. I will use higher quality later. Brian --- In AVR-Chat@yahoogroups.com, Philippe Habib wrote: > > If you're going to use that kind of memory, one thing to watch for is > the quality of the me
2010-02-14 by blue_eagle74
I have asked on the electonics 101 site. but would like ask here. Does anyone have an old SD Memory card of 16M to 256M memory card you want to sell? I was wanting to use it with a micro. I have looked around and havent found one. The smallest in the stores are 2G. Let me know wh
2010-02-13 by Adeilton Oliveira
Hello guys, A long time ago I posted a message about the project I was working on. The project has grown and I'd like to share with you the latest status. Now there are some people working with me in the software development and testing, and this week I received the first pics of
2010-02-08 by Roland Jollivet
Surely there is someone in your home town who has a similar programmer so you can just pop around and ascertain where the fault lies. Otherwise buy the cheapest simplest board you can get and do the flashing LED program. Then using the same I/O config try to duplicate it yourself
2010-02-07 by Kenny M.
That was just the sound of frustration, sorry. And the answer is I'm building this myself to get familiar with this stuff. I want to get one working so I can try playing with these chips and several other ideas I have. ----- Original Message ----- From: "Donald H" To: AVR-Chat@ya
2010-02-07 by Donald H
--- In AVR-Chat@yahoogroups.com, "Kenny M." wrote: > > > > > > > Well new wire, nice short runs, 100nf ceramic cap added from 5v+ to gnd > God is this aggravating, I could have had someone build 20 of these this things cheaper lol. 1) god won't help you 2) If you can pay to have
2010-02-07 by Kenny M.
Well new wire, nice short runs, 100nf ceramic cap added from 5v+ to gnd God is this aggravating, I could have had someone build 20 of these this things cheaper lol. So I have three options for my next step. 1) Try ordering some new chip(s) 2) Order a prebuilt protoboard 3) When I
2010-02-06 by Roland Jollivet
sample ----^^^^^-------- A/D uP pin | = | _____________________ Gnd So it's actually a low pass filter. Which perforce, limits the response, but you said your sampling time is > 1s, so it will be fine. Just be aware that some cap technologies leak more than others, but it should
2010-02-06 by Steve Hodge
Thanks. I assume put it in series between the input voltage and the uC ADC port pin? Steve | -----Original Message----- | From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On | Behalf Of Roland Jollivet | Sent: Saturday, February 06, 2010 1:07 AM | To: AVR-Chat@yah
2010-02-06 by Roland Jollivet
Even if you have a source of 100K, put a small cap, 1uF, at the input to the ADC. It now becomes very low impedance to the ADC. (even 100n will be fine) Time constant is 0.1s, so that's not aproblem. The biggest loss is the charge/discharge of the cap if the signal varies a lot.
2010-02-05 by Steve Hodge
Thanks a lot for everyone's help. Sounds like I'm good to go. Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Jeff Blaine AC0C Sent: Friday, February 05, 2010 2:12 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] ADC source impedance Ste
2010-02-05 by Jeff Blaine AC0C
Steve, Yes, sorry for the error. 100k. There will be some finite upper range to that due to leakage but it's got to me miniscule. But that's the general idea. And if you are talking about sampling 1x/sec then the 20K mentioned in the other message is not a problem at all. Good lu
2010-02-05 by Steve Hodge
Ah, got it. So it sounds like I'm just fine merely doubling it to 20 Kohms and only sampling once a second. I assume you intended to say "100k equivalent input"? Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Jeff Blaine AC0C Sent: Friday, Feb
2010-02-05 by Jeff Blaine AC0C
What Tim is talking about is the equivalent of an RC time constant. The input of the ADC is a capacitor based sample/hold type. Which means, as Tim points out, the longer the signal is at that pin, at a fixed level, the less current will be required for the sample cap to charge u
2010-02-05 by Steve Hodge
.and sampling once a second is overkill. From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of tim gilbert Sent: Friday, February 05, 2010 12:42 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] ADC source impedance Steve, How fast is the input signa
2010-02-05 by Steve Hodge
Oops, forgot something else. It's DC for all intents and purposes. From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of tim gilbert Sent: Friday, February 05, 2010 12:42 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] ADC source impedance Steve, H
2010-02-05 by tim gilbert
Steve, How fast is the input signal varying and how often are you sampling? If it's a slow signal you'll probably get away with it. Tim Gilbert JEM Innovation Inc. 303-926-9053 (office) 303-437-4342 (cell) 720-890-8582 (fax) www.jeminnovation.com www.pdksolutions.com ----- Origin
2010-02-05 by Steve Hodge
I didn't give enough information. The particular application does not need the full 10 bits of resolution. 9 bits or even 8 bits would be ok. I'm trying to keep the board to minimal size so I'd prefer not to have to cram in an opamp. In addition, the application will allow things
2010-02-05 by Dennis Clark
You can exceed it all you want, but you'll get inaccurate results. The problem is with an RC cap charging time constant. Higher impedances will slow that charge and you'll get "lower" numbers than you should. I like to feed the ADC with an OpAmp, a very low impedance there. DLC O
2010-02-05 by David VanHorn
On Fri, Feb 5, 2010 at 12:37 PM, Steve Hodge wrote: > The Atmel data sheets, at least the ones I'm dealing with, say the "ADC is > optimized for analog signals with an output impedance of approximately 10 K > or less". Does anyone have any experience about how much you can exceed
2010-02-05 by ecros_technology
--- In AVR-Chat@yahoogroups.com, "Steve Hodge" wrote: > ... the "ADC is optimized for analog > signals with an output impedance of > approximately 10 K or less" ... I'm > wondering if this can be increased to, > say 15 K or 20 K (or more?), without > much detectable effect. You'l
2010-02-05 by Steve Hodge
The Atmel data sheets, at least the ones I'm dealing with, say the "ADC is optimized for analog signals with an output impedance of approximately 10 K or less". Does anyone have any experience about how much you can exceed this 10 K? I have a simple voltage divider that I'm readi
2010-02-04 by Roland Jollivet
I don't know how the prices compare, but how about using a Ramtron device for storage? Roland www.ramtron.com On 4 February 2010 03:51, Dean Claxton wrote: > > > Ok thanks guys, > > I too plan just to use it for internal storage - it would not be accessible > to the end user with
2010-02-04 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Dean Claxton Sent: 04 February 2010 01:52 To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Looking at doing a datalogger using an XMEGA part - not sure which storage technol
2010-02-04 by Dave McLaughlin
Hi Dean, If you are doing your own boards and have a spare UART available, just use one of the FTDI USB devices. Every time I have used one of these it just works. I have read about people having so many issues getting USB in the AVR to work and for me is just now worth the time
2010-02-04 by Mike Payson
Do you specifically need features that the XMega's provide? If not, you might consider the largely overlooked ATMega32u4 or one of the AT90U series, which all have onboard USB. They are pretty slick parts. The only minor issue with them is that neither of the two big parts suppli
2010-02-04 by Dean Claxton
Ok thanks guys, I too plan just to use it for internal storage - it would not be accessible to the end user without opening the case. Download would most likely me via USB, but it seems the the XMEGA's dont feature USB. Perhaps I should start looking at the AVR32 as the external
2010-02-02 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Dave McLaughlin Sent: 02 February 2010 11:58 To: AVR-Chat@yahoogroups.com Subject: RE: [AVR-Chat] Looking at doing a datalogger using an XMEGA part - not sure which storage tech
2010-02-02 by Dave McLaughlin
Hi Tim, Yeah, I spotted that very same question and thought the answer simply jumped around the real answer. This all seems to be a grey area and there is no definite answer on their website. In fact, it is impossible to determine if you need this just to have the hardware presen
2010-02-02 by Tim Mitchell
Ummm... reading further on the SD assocation... I am possibly wrong on this. Their website descends into legalese on this issue. Elsewhere on the site it says: "If your company is planning to manufacture or have manufactured SD host products (eg. cell phones, cameras or computers
2010-02-02 by Tim Mitchell
SD is the same as USB, if you want to certify your product as "SD card/USB 2.0 compatible" or use the official logo on your product you have to join the "association". You do not need to join the association just to sell a product using the card. They are rather naughty about thi
2010-02-02 by Dave McLaughlin
Hi Mike, Interesting. I never knew about the SD licensing. I guess I need to do more research next time. The cost is actually $1000 per year which is not a lot if you sell loads of products but those companies like myself who sell only a few per year or one off bespoke designs, t
2010-02-02 by Donald H
--- In AVR-Chat@yahoogroups.com, Dean Claxton wrote: > > Ouch - thanks for that Mike - that may well tilt me away from SD. Do all the > other card formats have similar licencing? Licensing is for use of the logos. You can have an SD card in your product. Just don't use the SD log
2010-02-01 by Dean Claxton
Ouch - thanks for that Mike - that may well tilt me away from SD. Do all the other card formats have similar licencing? Dean On Tue, Feb 2, 2010 at 4:58 AM, Mike Payson wrote: > If you're making a product for sale, be sure to read the license terms of > each technology before dep
2010-02-01 by Kenny M.
Well new wire, nice short runs, 100nf ceramic cap added from 5v+ to gnd God is this aggravating, I could have had someone build 20 of these this things cheaper lol. So I have three options for my next step. 1) Try ordering some new chip(s) 2) Order a prebuilt protoboard 3) When I
2010-02-01 by Mike Payson
If you're making a product for sale, be sure to read the license terms of each technology before deploying. It's possible that you may decide that one tech is better than the other for non-technical reasons. I'm not familiar with Dataflash, but I can tell you that in order to inc
2010-02-01 by Tim Mitchell
----Original Message---- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Donald H Sent: 01 February 2010 15:29 To: AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: Looking at doing a datalogger using an XMEGA part - not sure which storage technology
2010-02-01 by Donald H
--- In AVR-Chat@yahoogroups.com, Dean Claxton wrote: > > Hi all, > > I've been a little out of touch with AVR's of late, and was surprised to > see the XMEGA part on the web site. Looks like a very capable little chip - > lots of goodies built in that could be very useful. When d
2010-02-01 by Dean Claxton
Hi all, I've been a little out of touch with AVR's of late, and was surprised to see the XMEGA part on the web site. Looks like a very capable little chip - lots of goodies built in that could be very useful. When did it come out? The datasheet revisions date back to 2008 - I mus
2010-01-29 by Kenny M.
I think I might pickup some lighter wire too. Maybe some telephone wire I think it's 26 gauge solid usually. ----- Original Message ----- From: "Ivan Vernot" To: AVR-Chat@yahoogroups.com Sent: Thursday, January 28, 2010 11:24:57 PM GMT -05:00 US/Canada Eastern Subject: RE: [AVR-C
2010-01-29 by Kenny M.
alright maybe I'll solder it back together then. I had actually put this together nice and tight on a board a few weeks ago. But since I was playing with pinouts, caps, resistors etc I took it apart and went down to this. I could just make some nice pieces of wire to use on the b
2010-01-29 by Ivan Vernot
Hi Kenny, I had a quick look at your setup and frankly you'd save yourself and us quite a bit of time if you made the whole setup a bit more 'solid'. As others have said flying wires everywhere - and no bypass caps - and uncertain continuity - and uncertain connections - are all
2010-01-29 by Kenny M.
Yes you're right, I had to reverse the connections when using the clip. I just didn't bother just for taking that pic. -Kenny ----- Original Message ----- From: "erikc" To: AVR-Chat@yahoogroups.com Sent: Thursday, January 28, 2010 10:29:30 PM GMT -05:00 US/Canada Eastern Subject:
2010-01-29 by erikc
In one of those pictures you have a part in an inverted "dip-clip". Is that part the AVR? If so, check all the connections. erikc Kenny M. wrote: > Here are some pics, hopefully you can make sense of them ... lol > > http://img163.imageshack.us/slideshow/webplayer.php?id=dsc00362
2010-01-29 by Kenny M.
I'll have to pick some up, I have some "Metallized Polyester" 100nf caps. No I haven't actually measured the wires but they're all about the same length. I'm not near the thing but I'll get you the length in a bit. Thanks, Kenny ----- Original Message ----- From: "John Samperi" T