Yahoo Groups archive
Messages
Page 121 of 307 · 15341 messages matched
2007-05-03 by dlc@frii.com
> > ... controllers without sensors. > > Sure, but not without feedback. I also use two ESCs, a Mamba 25 and an > E-Flite 25, which both use _sensorless_ feedback to sense dynamic > current and back-EMF. I'll bet yours do, too. Ahh, that makes sense - I didn't make that obvious c
2007-05-03 by Tom Becker
> ... controllers without sensors. Sure, but not without feedback. I also use two ESCs, a Mamba 25 and an E-Flite 25, which both use _sensorless_ feedback to sense dynamic current and back-EMF. I'll bet yours do, too. Tom
2007-05-03 by dlc@frii.com
>> ... Does anyone have any experience with creating an Atmel based motor >> controller? > > I've done a simple BLDD driver with a ATMega8535 (on a BX-24p). I did > it with three PWM phases, which yielded very slow slow low-torque > rotation. Getting speed from a BLDD requires fe
2007-05-03 by Tom Becker
> ... Does anyone have any experience with creating an Atmel based motor controller? I've done a simple BLDD driver with a ATMega8535 (on a BX-24p). I did it with three PWM phases, which yielded very slow slow low-torque rotation. Getting speed from a BLDD requires feedback, I th
2007-05-03 by Brandon
Does anyone have any experience with creating an Atmel based motor controller? These are commonly found in CD-ROMS and are extremely efficient as well as last much longer than traditional brushed motors. Thanks for the help!!
2007-05-03 by Andrew Tweddle
omid2007ir wrote: > i want OBDII lcd with ATmega16 and ELM323,who is work with OBDII > port ?pl help me > I have developed a reader for the japanese version. Can't remember the the spec name. The ELM232 is not necesaray if you use a micro-controller in the circuit, the interfaces
2007-05-03 by mago Umandam
ohh.. This is a simple solution. thanks for the idea... cheers mago Russell Shaw wrote: magzky02 wrote: > Hello guys > > i have to measure a voltage using ADC and display it on LCD display or > seven segment display. My problem is that the the voltage to be > measured is from 0-7
2007-05-03 by Russell Shaw
magzky02 wrote: > Hello guys > > i have to measure a voltage using ADC and display it on LCD display or > seven segment display. My problem is that the the voltage to be > measured is from 0-70 volts. if i use a 2.5 voltage reference, and use > voltage divider, i think it will no
2007-05-03 by dlc
There are a couple of ways and they are related. You will need to use 1% tolerance resistors or better. It also helps if you use an OpAmp with a programmable gain - To set that gain you'll need to use precision resistors again. This is the only path to success - precision resisto
2007-05-03 by kelvin kooger
Are you interested to sell to me in malaysia at what price ? srbnow wrote: Hi I have for sale an almost unused STK 500. If someone is interested to buy please email me. I am located in Nort carolina, USA or New Delhi, India. Thanks Sharad --------------------------------- Ahhh...
2007-05-03 by magzky02
Hello guys i have to measure a voltage using ADC and display it on LCD display or seven segment display. My problem is that the the voltage to be measured is from 0-70 volts. if i use a 2.5 voltage reference, and use voltage divider, i think it will not be accurate anymore becaus
2007-05-03 by stevech11
Probably not legal per US FCC Part 19 for Ham Radio (I am a licensee). You should be able to get that half-mile easily with a pair of 1W 902-928MHz serial port extender radios. I've used these. And a small yagi for one or both isn't expensive if you need its gain. Maxstream sells
2007-05-02 by Jeffrey Engel
--- kernels_nz wrote: > Hi guys, > > Has anybody ever looked at USB enumeration and > actually using > bit-banged USB on a microcontroller without a built > in USB interface ? > Im just wondering whether it is within the realms of > possibility ... > > Cheers > Hein B > Auckland
2007-05-02 by Roy E. Burrage
Why use a slide switch at all? If space is an issue, why not use a pushbutton switch and maybe an LED indicator for the setting. I assume you're using an AVR controller. You can program delays after which the setting is punched into the program and left until there's a change. RE
2007-05-02 by Richard Cooke
I don't think the 4-way rocker switch is the best choice. I need the switch to stay in position and give the end user an indication of what "port" they have selected. I have seen small devices with a four position slide switch. I just never thought it would be as tough as it's tu
2007-05-02 by Leon
----- Original Message ----- From: "Jim Wagner" To: Sent: Wednesday, May 02, 2007 10:32 PM Subject: Re: [AVR-Chat] Re: AM transmitter or receiver > Half mile in hilly wooded area is a bit of a challenge with > low power at ANY frequency. Trees tend to absorb pretty > well. > > Pr
2007-05-02 by Jim Wagner
Half mile in hilly wooded area is a bit of a challenge with low power at ANY frequency. Trees tend to absorb pretty well. Problem with low frequencies is that there is a lot of interferance. Problem with medium and higher frequencies is the terrain loss. AM won't gain you much. I
2007-05-02 by kholt@sonic.net
I am also looking for a cheap, simple, low power RF system that might as well be AM. I need to send intermittent telemetry over 1/2 mile of wooded hills, where there is not much RF noise at the low end. I am looking for low freq because of the hills, but would not like to be both
2007-05-02 by Jim Wagner
On Wed, 02 May 2007 18:57:48 +0100 Mike Harrison wrote: > A search for "SP4T Slide" at findchips.com comes up with > some very small SMD ones Those small SMD switches (aka "dip switch) are really too small for an operator interface. They are fine for a set/forget but pretty poor
2007-05-02 by Leon
----- Original Message ----- From: "kernels_nz" To: Sent: Wednesday, May 02, 2007 9:23 PM Subject: [AVR-Chat] USB Enumeration > Hi guys, > > Has anybody ever looked at USB enumeration and actually using > bit-banged USB on a microcontroller without a built in USB interface ? > Im
2007-05-02 by kernels_nz
Hi Ken, I have used the NRf905 IC from Nordic semiconductor many times, works very well, SPI interface, 433MHz means a 1/4 wave antenna is only 15cm or so. (about 10" I think) I can generally get about 800m - 1km very reliably. Cheers Hein B Auckland, NZ --- In AVR-Chat@yahoogrou
2007-05-02 by kernels_nz
Hi guys, Has anybody ever looked at USB enumeration and actually using bit-banged USB on a microcontroller without a built in USB interface ? Im just wondering whether it is within the realms of possibility ... Cheers Hein B Auckland New Zealand.
2007-05-02 by Mike Harrison
A search for "SP4T Slide" at findchips.com comes up with some very small SMD ones
2007-05-02 by BobGardner@aol.com
4pst slide switch? How about a 2 deck 4 pos rotary? Like a grayhil? They probably have something at Skycraft Surplus in Winter Park FL... they are on the web, do mail order... -----Original Message----- From: rcooke@digitalwavelength.com To: AVR-Chat@yahoogroups.com Sent: Wed, 2
2007-05-02 by Richard Cooke
Thanks Bob. But for space and looks I was hoping some one could point me to a slide switch. Something that isn't too hard to operate but not too big either. This will be used in a product we hope to sell (300 to 500 a month)so we need a supplier that can deliver that quantity. Ri
2007-05-02 by Richard Cooke
Hi Folks, I apologize up front for this OT post but I am using a ATmega48V for this project. I need to allow the end user to input a channel selection by sliding a switch to one of four positions. The trouble is I can't seem to locate a small 4 position switch at any of the usual
2007-05-01 by Jim Wagner
Well, yes, but.... That "transmitter" would have been almost as "dirty" as the old spark-gap guys in the early days. Harmonics would be horrendous. Now, you CAN do it at low frequencies using function generator techniques to generate low distortion AM sine waves (up to 5MHz, perh
2007-05-01 by Zack Widup
Hi Hein, I guess I should have clarified "for any distance". Yes, you can generate a signal with a few transistors and couple it to a small wire with a capacitor but you're only going to get a few hundrerd feet at most with it. That's why I wondered what it's to be used for and o
2007-05-01 by Tom Becker
> ... I believe mine was 1MHz... Did you treat harmonics? Tom
2007-05-01 by kernels_nz
Hi Zack, Cant say I fully agree, I cant recall the exact detail, but I have built a voice-AM transmitter without any coils, I went something like: Buy a 4-pin crystal oscillator outputting square waves at the frequency of carrier your looking for, I believe mine was 1MHz, then va
2007-05-01 by Zack Widup
It can't be done. You will need a coil at least for your antenna/matching. How much power are you talking about? What range do you want to cover? For what purpose? What frequency? What are the laws in your country regarding license-free transmissions on that frequency? Inquiring
2007-05-01 by Thomas Keller
srbnow wrote: HOw much? Does it have all cable,s and accessories with it? And I assume it is in working order? I am in Nebraska, if you need to compute shipping charges. Tom Keller > Hi > > I have for sale an almost unused STK 500. If someone is interested to > buy please email m
2007-05-01 by David VanHorn
On 4/25/07, azza eldessoky wrote: > please friends,can any one send me a circuit design for AM transmitter or receiver without any coils . > thanks alot Are you looking to do voice/music or data? Frequency band? Either way, you're likely to be better off buying a complete radio m
2007-04-30 by Roy
Yes I am just doing this for home projects. _______________________________________ Roy Hopkins ZL2RJH Tauranga New Zealand _______________________________________ -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of kernels_nz
2007-04-30 by kernels_nz
No worries, email me on hein @ andante . co . nz (without the spaces of course) and ill send you the C file and datasheet. It's pretty self explanatory. My pleasure to help fellow kiwis. Cheers Hein B --- In AVR-Chat@yahoogroups.com, "Roy" wrote: > > Yes I am just doing this for
2007-04-30 by kernels_nz
For non-commercial use ? --- In AVR-Chat@yahoogroups.com, "Roy" wrote: > > Are you willing to share your code for the SD card? > > > > _______________________________________ > > Roy Hopkins ZL2RJH > Tauranga > New Zealand > _______________________________________ > > -----Origin
2007-04-30 by Roy
Are you willing to share your code for the SD card? _______________________________________ Roy Hopkins ZL2RJH Tauranga New Zealand _______________________________________ -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of ker
2007-04-29 by kernels_nz
Hi guys, Id like to get back to SD-cards, maybe the boys at Sabre technology can help ? I spent most of my Sunday turning my "rough-as" SD card access code into nice functions and just generally modularizing the code. I did run into a weird problem tho . . . I initialize the SD-c
2007-04-26 by srbnow
Hi I have for sale an almost unused STK 500. If someone is interested to buy please email me. I am located in Nort carolina, USA or New Delhi, India. Thanks Sharad
2007-04-25 by John Samperi
At 09:12 PM 25/04/2007, you wrote: >I bought LCD display and numerical keypad >Where can i find specific book lo learn C for AVR and some steps to start in >C with these components ? The first thing you need is AVR Studio installed in your computer which has now an interface to W
2007-04-25 by azza eldessoky
please friends,can any one send me a circuit design for AM transmitter or receiver without any coils . thanks alot azza --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos. [Non-text portions of this message have
2007-04-25 by Ken@Japan
--- In AVR-Chat@yahoogroups.com, Ralph Hilton wrote: > http://www.prllc.com/productcart/pc/viewPrd.asp?idcategory=6&idproduct=12 A free example can be found at Peter Fleury's site... http://homepage.hispeed.ch/peterfleury/ Ken@Japan
2007-04-25 by Riccardo Castellani
I know C programming language but not in specific area of AVR microsontrollers. I have 2 programmers:STK500 , AVRISP mkII I bought LCD display and numerical keypad Where can i find specific book lo learn C for AVR and some steps to start in C with these components ?
2007-04-25 by Ralph Hilton
On Wed, 25 Apr 2007 13:12:40 +0200 you wrote: > I know C programming language but not in specific area of AVR >microsontrollers. >I have 2 programmers:STK500 , AVRISP mkII >I bought LCD display and numerical keypad >Where can i find specific book lo learn C for AVR and some steps
2007-04-21 by Ken Arck
At 09:44 AM 4/21/2007, you wrote: >I'm using the 3.686 mhz version part number ach-3.6864mhz-ek > >My next order will be for normal crystals, in the mean time, I would >really like to figure out how to use the ones I've already bought. I >hate to pay $10 in s&h for a $0.45 part.
2007-04-21 by jasonparkerhendrix
I'm using the 3.686 mhz version part number ach-3.6864mhz-ek My next order will be for normal crystals, in the mean time, I would really like to figure out how to use the ones I've already bought. I hate to pay $10 in s&h for a $0.45 part. Thanks, Jason --- In AVR-Chat@yahoogroup
2007-04-21 by Reza
The device (ACH) your using is a simple crystal oscilator, it's better to use a simple crystal. but if you wana use this part: - it seems to use 50pf capacitors in circuit. - it seems to be work on any frequency (due to part number), your ATmega32 does not work faster than 8MHz i
2007-04-20 by David VanHorn
On 4/20/07, jasonparkerhendrix wrote: > The clock only has 4 pins. I have them connected like this: > > pin 1 floating. > pin 4 to ground. > pin 5 to xtal1 on the atmega32. > pin 8 to voltage. > > > I have no other clock related connections connected. > On the AVR?
2007-04-20 by David VanHorn
On 4/20/07, jasonparkerhendrix wrote: > When set to use an internal clock (atmega32), my app works ok. > > When set to use an external clock (fuses CKSEL = 0000 and SUT = 10) the > chip does nothing. I assume I have something wired incorrectly. Which pin did you connect the clock
2007-04-20 by David VanHorn
If you want accuracy, you can run the hart-steinhart equation.