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2005-09-30 by David Kelly
On Sep 29, 2005, at 9:17 PM, pinky elodia wrote: > thanks....for your concern... > actually where can i get information about this..maybe about your > project.... > now, i,m thinking to make to kind of sensor ( light and > temperature) and control by one uC,ATmega128...is it poss
2005-09-30 by Aaron
On a mega48, I am trying to generate a external interrupt in the software by writing: sbi EIFR, INTF0 ; simulate a step in test mode by setting INT0 flag (step input) But this doesn't seem to work -- neither in the simulator nor on real hardware. I am 99% sure INT0 is set up prop
2005-09-30 by pinky elodia
thanks....for your concern... actually where can i get information about this..maybe about your project.... now, i,m thinking to make to kind of sensor ( light and temperature) and control by one uC,ATmega128...is it possible?? For ATmega128, there are 4 input for ADC right?..but
2005-09-30 by Farzlina Ab.Hadi
hi everyone! i am doing a modem communication for a telephony design. we decided to use the v.22bis protocol for modem comm. on my observation, when working at 2400b/s, after handshake , there will be stream of garbage seen on the hyper terminal. so my tx and rx is definitely out
2005-09-28 by kholt@sonic.net
Over the years, I have tried many ways to measure the height of the water in our fiberglass fresh tank, which holds only up to 3.5 ft of head. I have recently been using a cheap pressure sensor, connected to an AVR to process the signal, display, and sound alarms. The sensors are
2005-09-28 by kholt@sonic.net
The benefit of the switched input rather than a full wave rectifier is that the input now becomes "tuned" to the frequency and phase of the generated sense signal, thereby reducing or eliminating most other spurious signals. It may not be necessary in this application, but it is
2005-09-27 by Zack Widup
Maybe you could implement this: http://ww1.microchip.com/downloads/en/AppNotes/00512e.pdf This circuit is designed for a PIC but I am in the process of implementing it with an AVR. I have used the PIC version to detect the water levels in boreholes and mine voids with the probes
2005-09-27 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, Ralph Hilton wrote: > I would be inclined to use an analog switch such an a 4053 and the ADC. Take a resistor > from Vcc to an ADC pin. Connect the control of the 4053 to a high frequency signal. The > pins ADC in and GND would connect to the swit
2005-09-26 by Ralph Hilton
On Mon, 26 Sep 2005 21:13:29 +1000 you wrote: >Thank you for the suggestion Ralph, the application is for the sudden loss >of coolant from an engine, detecting the presence or absence of coolant in >the top tank of a radiator for this the stainless steel probe works well and >is
2005-09-26 by Don Jackson - AE5K
OWEN-A wrote: > Thank you for the reply Kat, > yes your suggestion would work well for a while but any dc component can > cause electrolysis and plating which is also accelerated by the heat of the > coolant and can eat away the electrode or the tank near the electrode fairly > q
2005-09-26 by Tom Becker
> ... any dc component can cause electrolysis... I capacitively coupled a 555 pulse through soil with buried stainless probes for pseudo-hydroponics some 20 years ago. The systems are still running. Tom
2005-09-26 by OWEN-A
Thank you for the reply Kat, yes your suggestion would work well for a while but any dc component can cause electrolysis and plating which is also accelerated by the heat of the coolant and can eat away the electrode or the tank near the electrode fairly quickly, the probe is usu
2005-09-26 by Kathy Quinlan
OWEN-A wrote: > Thank you for the suggestion Ralph, the application is for the sudden loss > of coolant from an engine, detecting the presence or absence of coolant in > the top tank of a radiator for this the stainless steel probe works well and > is very robust, an earlier syst
2005-09-26 by OWEN-A
Thank you for the suggestion Ralph, the application is for the sudden loss of coolant from an engine, detecting the presence or absence of coolant in the top tank of a radiator for this the stainless steel probe works well and is very robust, an earlier system used a pressure swi
2005-09-26 by John Samperi
At 03:21 PM 26/09/2005, you wrote: >I have in the past used the NS LM1830 Looks like a discontinued product from NS. I have 6 left in stock :-) from an old client's product which we no longer make. Once upon a time I used to just send 6V ac into the water tank and rectify the ret
2005-09-26 by Ralph Hilton
On Mon, 26 Sep 2005 15:21:18 +1000 you wrote: >I have in the past used the NS LM1830 chip to monitor loss of water this >chip feeds an ac signal to a probe, ac is used to prevent build up of oxides >on the probe but can no longer find a supplier of these chips in Australia. >Has
2005-09-26 by OWEN-A
I have in the past used the NS LM1830 chip to monitor loss of water this chip feeds an ac signal to a probe, ac is used to prevent build up of oxides on the probe but can no longer find a supplier of these chips in Australia. Has anyone tried using a micro for this purpose and ha
2005-09-25 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Anurag Chugh" wrote: > I wrote to one of the authors of > the digital design books we use > as text in college on why 5v was > choosen as logic one... 5 volts was not "chosen as logic one". You're confusing logic levels with the supply voltage of
2005-09-25 by aila hassanalizadeh
u should use span circuit to change your 0-10 voltage to 0-5v . m_juliat wrote: Hi I use sensor with output 0-10 volt plz Help me how to connect 0-10 volt sensor to internal A/D (0-5 volt working good but how to connect 0-10v) Thanks M.Juliat _____________________________________
2005-09-24 by Johnathan Corgan
I am continuing my work to add an inboard FTDI USB serial converter-based bit bang programming mode to avrdude. This allows one to wire MOSI/MISO/SCLK/RESET to the FTDI bit-bang bus and have USB based in-circuit programming of an AVR. So, one could use an FT232BM or similar part
2005-09-24 by Ralph Hilton
On Fri, 23 Sep 2005 21:08:19 -0000 you wrote: >--- In AVR-Chat@yahoogroups.com, Ralph Hilton wrote: > >> Connect a 10k resistor from the sensor output to the ADC input and >10k from the ADC input >> to ground. that will halve the voltage on the ADC input pin. For >safety I would
2005-09-23 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, Ralph Hilton wrote: > Connect a 10k resistor from the sensor output to the ADC input and 10k from the ADC input > to ground. that will halve the voltage on the ADC input pin. For safety I would add a > protection diode from the ADC input to the +5
2005-09-23 by Ivan Vernot
Hi Jim, That sounds like a great idea. Doing it on a PCB would mean that each antenna will be identical (and saves all that winding :-)). The problem (for me) though is how do I work out how many turns I need (how wide the tracks need to be, etc.) If you have any links I could ch
2005-09-23 by John Samperi
At 09:22 AM 23/09/2005, you wrote: >I am after an antenna a 125KHz proximity card reader (think of an access control application) Have you tried Omron? Unfortunately the person looking after RFID is in Hong Kong for another week or so. Regards John Samperi ***********************
2005-09-22 by Jim Wagner
Make yourself an antenna with a spiral trace on a circuit board! Resonate it with a capacitor to 125KHz and you should be in. The more sprirals, you have, the better, because the resonating cap will be smaller and the coupling to the tag will be better. At 125KHz, the coupling is
2005-09-22 by Ivan Vernot
Thanks Zack, After seeing your post I checked Digi-Key. As far as I can see, they only carry the 'TIRIS' (Texas Instruments RFID) stuff. It is at 132KHz and uses quite large (~1m) antennae. I am after an antenna To: Sent: Wednesday, September 21, 2005 10:25 PM Subject: Re: [AVR-C
2005-09-22 by Ralph Hilton
On Thu, 22 Sep 2005 09:45:41 -0400 you wrote: >Ralph > >Which way should the diode go - Anode to 5v or Cathode to 5v? > >I'm guessing it's backwards (K to 5v) to block large V from coming into the >5v line, kinda like the flyback/free-wheeling diode on a relay or motor, >right? I
2005-09-22 by Randy Ledyard
Ralph Which way should the diode go - Anode to 5v or Cathode to 5v? I'm guessing it's backwards (K to 5v) to block large V from coming into the 5v line, kinda like the flyback/free-wheeling diode on a relay or motor, right? > -----Original Message----- > From: AVR-Chat@yahoogroup
2005-09-22 by David Kelly
On Thu, Sep 22, 2005 at 02:28:49PM +0200, Ralph Hilton wrote: > On Thu, 22 Sep 2005 12:11:25 -0000 you wrote: > > >Hi > > > >I use sensor with output 0-10 volt > > > >plz Help me how to connect 0-10 volt sensor to internal A/D > > > >(0-5 volt working good but how to connect 0-10
2005-09-22 by Ralph Hilton
On Thu, 22 Sep 2005 12:11:25 -0000 you wrote: >Hi > >I use sensor with output 0-10 volt > >plz Help me how to connect 0-10 volt sensor to internal A/D > >(0-5 volt working good but how to connect 0-10v) > >Thanks > >M.Juliat Connect a 10k resistor from the sensor output to the AD
2005-09-22 by m_juliat
Hi I use sensor with output 0-10 volt plz Help me how to connect 0-10 volt sensor to internal A/D (0-5 volt working good but how to connect 0-10v) Thanks M.Juliat
2005-09-21 by Robert Diamond
There's also a book, the first chapter of which is available on the web - see www.smileymicros.com. He also sells Butterflies and development kits for them. --- In AVR-Chat@yahoogroups.com, "Arif Deshmukh" wrote: > > Hello, > I am look out for tutorial for AVR coding using C. If
2005-09-21 by arhodes19044
I really love the idea of small "rapid development" boards that allow the beginner to have excellent functionality with minimal effort. While we "geeks" like to know, and touch the hardware (i.e. ASM programmers), I think that the most innovative use of these devices will come fr
2005-09-21 by Farzlina Ab.Hadi
hello! i have been trying to get my rtc running but i can't get it run. i have used the spi before to run my modem and caller id. no problem. but i really got stuck with this rtc. the way i configure my spi for the is: cpol = 0 dord= 0 cpha = 1 mode = 1 fclk/64 i come to the exte
2005-09-21 by Zack Widup
On 15 Sep 2005, Arif Deshmukh wrote: > > > Hi, > I also have thoughts why equipments are desinged to work in some certain voltages. Like..... > > 1. Most of electronic items uses 12V. > 2. Radio transceiver HF/VHF/UHF work on 13.8V. (Why 13.8 such a odd figure) > > Bye > Arif > 1
2005-09-21 by Tom Connell
13.8 volts is the voltage level on the supply line of a 12v automotive battery under charge, so is an appropriate supply voltage for equipment intended for mobile use. Tom Connell www.TJConnell.co.uk -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoo
2005-09-21 by Arif YILMAZ
Hi Arif, there are a few useful application notes on Atmel's site , check it out and let me know if you cant find 4rif -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Arif Deshmukh Sent: Thursday, September 15, 2005 9:24 AM
2005-09-21 by Leon Heller
----- Original Message ----- From: "Arif Deshmukh" To: Sent: Thursday, September 15, 2005 7:30 AM Subject: Re: [AVR-Chat] logic levels.. Hi, I also have thoughts why equipments are desinged to work in some certain voltages. Like..... 1. Most of electronic items uses 12V. 2. Radio
2005-09-21 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "Arif Deshmukh" wrote: > I am look out for tutorial for AVR coding using C. Check the AVR-GCC section of avrfreaks.net. In particular, there is a thread for those getting started: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=2
2005-09-21 by Zack Widup
Hi Ivan, You didn't say where you are located. Can you order from Digi-Key? They have a whole assortment of RFID antennas and coils in their catalog. Zack On Wed, 21 Sep 2005, Ivan Vernot wrote: > Hello All, > Apologies for off topic post but I'm using an AVR for this gadget ;-)
2005-09-21 by Ivan Vernot
Hello All, Apologies for off topic post but I'm using an AVR for this gadget ;-) I am looking for a supplier that is able to wind an open core coil to be used in an RFID application. The coil is used for the antenna of the RFID system and is typically a few tens of turns in reaso
2005-09-20 by upand_at_them
Well, you don't have to buy the SX-Key...you can build an SX programmer for less: http://www.semis.demon.co.uk/Sx/SXmain.htm Mike --- In AVR-Chat@yahoogroups.com, techy fellow wrote: > Another easy-to-use MCU you can consider is, the SX family distributed by Parallax (used to be
2005-09-20 by Mark Jordan
Thanks, I have found that book online at http://www.dspguide.com Mark Jordan On 19 Sep 2005 at 21:38, Larry Barello wrote: > Do a Google search on Infinite Impulse Response filters. > > I first learned about them in the book "The scientist and Engineers guide to > digital signal
2005-09-20 by Massimo Banzi
Dears I have been lurking on this forum for a while and I thought I'd let you know about this opensource AVR platform I've worked on. I teach in a design school, specifically interaction design, and my job is to teach designers how to exploit electronics and microcontrollers to m
2005-09-20 by Larry Barello
Do a Google search on Infinite Impulse Response filters. I first learned about them in the book "The scientist and Engineers guide to digital signal processing", Steven Smith. Chapter 19, 20, ... You can make pretty fancy filters by feeding forward and backwards several discrete
2005-09-20 by Mark Jordan
On 11 Sep 2005 at 14:15, Larry Barello wrote: > The weighted average filter is the digital version of a single > stage RC filter. A weighted average filter looks something like > this: > > Output = (prev_output - input)* K1 + input > > Where K1 is equal to e^-(dt/tau). Dt = the s
2005-09-20 by Larry Barello
Given that this is an AVR forum, not a PIC one, let me plug a product that I have found very useful: BASCOM. A free 4k limit compiler is available and supports most AVR chips. The BASIC dialect is plenty powerful, lots of library support (LCD, one wire, switches, AT keyboard, gra
2005-09-20 by techy fellow
Another easy-to-use MCU you can consider is, the SX family distributed by Parallax (used to be from Ubicom). I suspect Parallax is trying to set a difference between their expensive part (read, premium), Basic Stamp family and a low cost version (SX). You will be surprise, SX is
2005-09-19 by Dingo
http://www.microzed.com.au/ is the importer in Australia of PICAXE. They have been around a while. They are great for simple tasks and Rev-Ed (the makers) have lots of information freely available to control servos, motors, etc. They are aimed squarely at the education market. As
2005-09-19 by upand_at_them
I've used PICAXEs. They're pretty cool. A nice, cheaper alternative to BASIC Stamps. I don't use them anymore, because I'm much better at programming PICs now and PICAXEs, of course, have limitations and overhead. I would definitely recommend them for schools, though. The cost is