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2009-02-10 by Steven Hodge
Yeah, I stupidly blundered into that one on the capacitor, all right. But, I'll bite. I don't have any diodes. The power source is not an AC power supply but a 12 VDC battery (a large 700 amp-hr boat system) and I don't bother with reverse polarity protection (I prefer being care
2009-02-10 by David VanHorn
> In my case the switch is input to a regulator which is supplying DC voltage > to a microcontroller and its peripheral chips. The regulator has the usual > input capacitor on it. Does this qualify as a resistive load? It would > seem to me that it does. definitely not! Calculate
2009-02-10 by Steven Hodge
Well now I'm even more confused. If VA is a measure of reactive/apparent power, then why is there a separate rating for "VAC" (which looks like a reactive rating to me)? In other words, where is the resistive/real power rating? It is definitely correct about looking at the actual
2009-02-10 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Steven Hodge" wrote: > ... the actual data sheet ... says > ... "gold: 0.4 VA max @ 20 VDC or > peak AC". Does that seriously mean > the switch can only handle a pathetic > 33 mA at 12 VDC (or 20 mA at 20 VDC)? Once you're reading the data sheet,
2009-02-10 by David Kelly
On Tue, Feb 10, 2009 at 08:13:54AM -0800, Steven Hodge wrote: > I may have posed this question some time ago, but I'm still confused. > I'm trying to determine if a pcb slide switch will meet my current > requirements, which in this particular case are 200 mA at 12 VDC. So > I'm
2009-02-10 by David VanHorn
On Tue, Feb 10, 2009 at 11:33 AM, Graham Davies wrote: > Also, Mouser tries to force specifications > into a pattern to drive their on-line part selection tool (which thinks > that 200 mA, 0.2 A and 0.200 A are diffent ratings). Digikey has similar problems.. But things are clean
2009-02-10 by wagnerj@proaxis.com
> What they are talking about there, is the difference between an > reactive load and a resistive load. > > http://en.wikipedia.org/wiki/Volt-ampere > > Reactive loads can cause a lot more wear on a switch during make or > break than resistive loads. > There are other issues than
2009-02-10 by David VanHorn
What they are talking about there, is the difference between an reactive load and a resistive load. http://en.wikipedia.org/wiki/Volt-ampere Reactive loads can cause a lot more wear on a switch during make or break than resistive loads.
2009-02-10 by Steven Hodge
I may have posed this question some time ago, but I'm still confused. I'm trying to determine if a pcb slide switch will meet my current requirements, which in this particular case are 200 mA at 12 VDC. So I'm looking at a page (1646) of the Mouser catalog, for such switches all
2009-02-10 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Steven Hodge" wrote: > ... the Mouser catalog ... it's driving me nuts. Don't rely on specifications in the Mouser catalog. Obtain and read the manufacturer's data sheets. Quite often there are transcription errors in Mouser's data. Also, Mouser
2009-02-04 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Kathy Quinlan wrote: > ... I noticed the oven has IR heaters ... In my toaster oven, the heaters are, indeed, quartz tubes with resistive wire embedded in them. They glow bright enough to see by (there is no other source of light in the oven). > I
2009-02-04 by Kathy Quinlan
Dave Hylands wrote: > > On Sat, Jan 24, 2009 at 9:06 PM, rutabagalips > > wrote: > > Google for Toaster Oven Reflow...I have seen a number of articles on > this, including one on Circuit Cellar Ink. > > My brother Jon built a reflow oven using a design based on the one > from the
2009-01-29 by John
The online Modbus organization has the documents describing the protocol. You have to do some looking for the older reference docs, the newer ones primarily concentrate on Modbus/TCP. You will also need the Micromotion document for the head you are using. There is a specific layo
2009-01-27 by dlc
Google is your friend, look up "modbus" with Google, or on wikipedia. DLC babak wrote: > Hi,dears > I want connect AVR(master) to micromotion flowmeter(slave).this > connection base on Rs485 plz help me for Modbus Protocol On AVR. > > > ------------------------------------ > > Ya
2009-01-27 by David Kelly
On Tue, Jan 27, 2009 at 04:05:59AM -0000, babak wrote: > Hi,dears > I want connect AVR(master) to micromotion flowmeter(slave).this > connection base on Rs485 plz help me for Modbus Protocol On AVR. Serial Modbus is an asynchronous serial. The protocol specification is available
2009-01-27 by Zack Widup
I don't know much about the micromotion flowmeter but I did something similar with the PNI Micromag 2 magnetic field sensor. I just downloaded the manual for it and wrote a program in assembler to read the device by bitbanging. Zack On Mon, Jan 26, 2009 at 10:05 PM, babak wrote:
2009-01-27 by Phil Birkelbach
http://www.modbus.org/ - The specifications are free. You'll find the Modbus protocol to be quite simple. I wrote a small slave for one of those "Other" microcontrollers in a few days. Sorry no code for a master. You'll need an RS485 transceiver. I like the Maxim MAX483, myself.
2009-01-27 by babak
Hi,dears I want connect AVR(master) to micromotion flowmeter(slave).this connection base on Rs485 plz help me for Modbus Protocol On AVR.
2009-01-25 by John Samperi
At 10:12 AM 26/01/2009, you wrote: >OKAY Technologies >Pullman Place >Emu Plains Thanks Tim. Normal "WTF have I got myself into" can now resume. :-) Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham H
2009-01-25 by avr@m-s-m.biz
OKAY Technologies Pullman Place Emu Plains okay.com.au Visited warehouse for 1st purchase & they were helpful although I spent less than $25 with them that time. They gave me plenty of catalogues & seem to be able to supply all your soldering needs Cheers Tim P.S. I found that ge
2009-01-25 by John Samperi
At 05:13 PM 25/01/2009, you wrote: >found a good place in Penrith (NSW) that has a >range of solder pastes which makes applying the paste easier Company mane please. :-) Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11 Broken
2009-01-25 by John Samperi
At 02:36 AM 26/01/2009, you wrote: >i will try to disconnect the Vcc of the max202 and see DONT!!!! You are only making things worse as the whole chip will try to power up from the TX pin and the programmer. You have most likely BLOWN up all of the programmers used as they will b
2009-01-25 by David VanHorn
http://groups.yahoo.com/group/E-Z_Bake/ A very low traffic group with some good info in the files and archives.
2009-01-25 by xolang1
thanks guys, but... As I am using mega128, the the prog pins are shared with UART on PE0 and PE1 whcih are also conencted to a max202 chip. I have no prolem programing the chip even with this set up in this board before. So i assume it should not be aproblem in this case. another
2009-01-25 by Roy E. Burrage
If you plan to use the ISP and external circuits on the programming pins, Chris, you should always put a resistor in series with the external circuits so they don't load down the ISP signals ... not to mention possible unintentional damage to your external system in some manner.
2009-01-25 by Christopher Baker
Thhis may or may not help, but I had a similar problem before. I had an LED on my miso and mosi pins. When trying to program the chip in- system, the LEDs would flash and I don't think the voltage threshod was high enough to reprogram the chip, resulting in an obscure error. My s
2009-01-25 by xolang1
Hi Guys, I have a board with atmega128L and have sucessfully programmed the chip using an AVRISP. However after adding some components on board, I get "AVRISP Error entering programming mode" in codevision and a similar message in AVRstudio. - I know that the AVRISP is working as
2009-01-25 by Dave Hylands
On Sat, Jan 24, 2009 at 9:06 PM, rutabagalips wrote: > Google for Toaster Oven Reflow...I have seen a number of articles on this, including one on Circuit Cellar Ink. My brother Jon built a reflow oven using a design based on the one from the Circuit Cellar Ink, but using an ATMe
2009-01-25 by avr@m-s-m.biz
Try to have a read of Silicon Chip Issue 234, March 2008. I have used the article by Jim Rowe, titled "How to Solder Surface Mount Devices", as a basis for the reflow Soldering of protoypes. It took a few tries to work out the correct amount of paste to use, as well as the correc
2009-01-25 by rutabagalips
Google for Toaster Oven Reflow...I have seen a number of articles on this, including one on Circuit Cellar Ink. --- On Sat, 1/24/09, Kathy Quinlan wrote: From: Kathy Quinlan Subject: [AVR-Chat] WTF have I got myself into ? To: AVR-Chat@yahoogroups.com Date: Saturday, January 24,
2009-01-24 by Art
Electric Skillet has also been done by SparkFun. http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=59 Regards, Art [Non-text portions of this message have been removed]
2009-01-24 by AVR-Chat@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the AVR-Chat group. File : /Binary to ASCII Decimal/Bin2Dec.asm Uploaded by : hal.foster Description : Convert 1 to 4 byte binary number to formatted ASCII You can acces
2009-01-24 by AVR-Chat@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the AVR-Chat group. File : /AVR ASM Math Routines/Math_v2.asm Uploaded by : hal.foster Description : 8/16/32/64 bit math routines You can access this file at the URL: ht
2009-01-24 by Bill Knight
Kat I've done surface mount with a convection toaster oven several times in the past. There are a number of articles out there describing the process. I also know of a couple of folks who routinely use the process you are considering. One thing I would caution you about is not us
2009-01-24 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Kathy Quinlan wrote: > ... solder ... a 40 lead QFN with > centre ground pad ... 6mm Sq with > 0.5mm pad centres ... It's not a good idea to heat the PCB from underneath. Even heat from above takes the material of the PCB above its glass transitio
2009-01-24 by Jeffrey Engel
Disclaimer: I haven't tried this, so I don't know how well it works. Sparkfun has done a couple of DIY reflow projects. Here's one: http://www.sparkfun.com/commerce/product_info.php?products_id=81 Best of Luck, Jeff --- On Sat, 1/24/09, Kathy Quinlan wrote: From: Kathy Quinlan Su
2009-01-24 by Kathy Quinlan
Hi All, OK a customer has asked me to solder up some PCB's, no problem, apart from the main part a DSP in a 40 lead QFN with centre ground pad this sucker is 6mm Sq with 0.5mm pad centres, has anyone ever soldered one of these ? I am planning on using solder paste and hot air, th
2009-01-20 by Enki
On 20 Jan 2009 at 8:07, David VanHorn wrote: > On Mon, Jan 19, 2009 at 11:53 PM, Dean Claxton wrote: > > Hi all, > > > > I'm looking for recommendations as to a suitable wireless technology that > > will allow data to be transmitted over distances up to 400m. > > The nordic NRF(w
2009-01-20 by David VanHorn
On Mon, Jan 19, 2009 at 11:53 PM, Dean Claxton wrote: > Hi all, > > I'm looking for recommendations as to a suitable wireless technology that > will allow data to be transmitted over distances up to 400m. The nordic NRF(whatever) chips do pretty well. Last time I tested them with
2009-01-20 by David Kelly
On Jan 19, 2009, at 11:01 PM, Mat Tubb wrote: > I use Aerocomm radio modems good for much greater distances. I second that. Name has changed in the last year, at least in the Mouser catalog. Now going by their parent company's name, Laird Technologies. Starter/development kit: $2
2009-01-20 by David Kelly
On Jan 19, 2009, at 11:19 PM, Dean Claxton wrote: > I stumbled across the Radiometrix NiM2T and NiM2R - priced at > approx US$70 > for the pair - seems reasonable and claim up to 500m range. > > Looks fairly simple to integrate - any thoughts? Its radio so when claiming 500m rang
2009-01-20 by Roy E. Burrage
You might check out the current edition of Circuit Cellar Ink, Dean. It's dedicated to wireless communication. REB Dean Claxton wrote: > I stumbled across the Radiometrix NiM2T and NiM2R - priced at approx US$70 > for the pair - seems reasonable and claim up to 500m range. > > Lo
2009-01-20 by Dean Claxton
Data rate is not an issue - 1kbps is more than enough in this instance. Basically it will be running remote warning signals. Dean On Tue, Jan 20, 2009 at 3:26 PM, dlc wrote: > If you are outside and line of site Zigbee modules are good for that > distance if they use the higher p
2009-01-20 by dlc
If you are outside and line of site Zigbee modules are good for that distance if they use the higher power amp outputs (XBee Pro for example), they are only a data rate of about 250Kbps however. DLC Dean Claxton wrote: > Hi all, > > I'm looking for recommendations as to a suitabl
2009-01-20 by Dean Claxton
I stumbled across the Radiometrix NiM2T and NiM2R - priced at approx US$70 for the pair - seems reasonable and claim up to 500m range. Looks fairly simple to integrate - any thoughts? Dean On Tue, Jan 20, 2009 at 3:01 PM, Mat Tubb wrote: > I use Aerocomm radio modems good for muc
2009-01-20 by stevech11
Look at Digi.com - 900MHz $150 per radio with enclosure. XBee at 2.4GHz or 900MHz in a box or as a bare module: not as robust, but OK if you have line of sight or nearly so. --- In AVR-Chat@yahoogroups.com, "Dean Claxton" wrote: > > Data rate is not an issue - 1kbps is more than
2009-01-20 by Mat Tubb
I use Aerocomm radio modems good for much greater distances. regards Mat Tubb Airship Solutions Pty Ltd http://www.airship.com.au/ Ph: 1300 791 068 Mb: 0415 150 414 -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Dean Claxt
2009-01-20 by Philippe Habib
Check out the B&B catalog. They've got whatever you need. It sounds like you're looking for small numbers so you may as well buy it instead of building it. http://www.bb-elec.com/ On Jan 19, 2009, at 8:53 PM, Dean Claxton wrote: > Hi all, > > I'm looking for recommendations as to
2009-01-20 by Dean Claxton
Hi all, I'm looking for recommendations as to a suitable wireless technology that will allow data to be transmitted over distances up to 400m. Baud rate not a problem. It will be used outdoors around a Quarry site. Any thoughts? Zigbee? Standard 433MHz stuff? Dean [Non-text porti
2009-01-18 by David Kelly
On Jan 17, 2009, at 8:13 AM, Muhammad Amiruddin wrote: > because with asm , we can directly access the bit of certain > registry that we need to use, and with this asm is more powerfull > than c. Do it all the time in C. Usually compiles down to exactly the same single assembly i