Fan-Out
2004-03-13 by LightYearCS
What is the fan-out for the SPI lines on the ATMega64? By the way, fan-out is an older term meaning “how many standard inputs can an output drive.” I’d figure it out but I’m lazy and here you guys are. Barry
Messages
Browse messages
Page 293 of 307 · 15341 messages matched
RE: [AVR-Chat] It just rests
2004-03-13 by LightYearCS
Generally speaking you ALWAYS need bypass capacitors. The AVR chips generate a lot of power supply spikes which the bypass capacitors "bypass" to ground. Bypass capacitors should be placed as close as possible to the power supply pins of your chip. In fact, it's best if you can r
Re: [AVR-Chat] Re: Speed Trap
2004-03-12 by Wagner Lipnharski
Larry Barello wrote: > This isn't my experience. I find wide variations among sensors - > particularly after soldering them into boards. Even sensors that are > suppose to have tight tolerances. And incidental environmental light > can make the situation even worse. Of course, it
RE: [AVR-Chat] Re: Speed Trap
2004-03-12 by Larry Barello
This isn't my experience. I find wide variations among sensors - particularly after soldering them into boards. Even sensors that are suppose to have tight tolerances. And incidental environmental light can make the situation even worse. -----Original Message----- From: Wagner Li
Re: [AVR-Chat] Re: Speed Trap
2004-03-12 by Wagner Lipnharski
Dave VanHorn wrote: > At 09:23 PM 3/10/2004 +0000, William Nachefski wrote: >> Wow! what a response. Actually my tolerances are quite large, + or >> - say 10 m/sec. As for placement of the sensors I have no set >> length yet, I just threw 1" as an arbitrary number. What distance
Re: [AVR-Chat] Speed Trap
2004-03-12 by Dave VanHorn
>not unless you're drawing your own wires or carefully >selecting the wires from a large spool. A few percent difference in >wire diameter "dramatically" changes its physical strength. Depends on the wire. Piano wire won't stretch much, and besides, it should be extremely consist
Re: [AVR-Chat] Avr ISP
2004-03-12 by Wagner Lipnharski
Capricon wrote: > What is the difference between a stk500 and a avr_ISP? > > Capricon STK500 and AVR-ISP? Size, Price, appearance, functions, operation. If you plan to program your AVRs on their own boards, the AVR-ISP is better since it is smaller and cheapper than the STK500. P
RE: [AVR-Chat] Avr ISP
2004-03-12 by Cobb, Quentin
I assume you mean AVR-ISP and STK500 :) The AVR is nice in that you need very little in the way of external support components. things are simple with the internal oscillator: +5V, a resistor to pull reset high, connections to the power & ISP pins and you're away. You will need a
Re: [AVR-Chat] It just rests
2004-03-12 by dvanhorn@cedar.net
> > I forgot to mention a normal computer power supply feeds my board. Do > you think I still need the bypass caps? Absolutely. Sometimes a project seems to work without them, but if so, you got lucky.
RE: [AVR-Chat] Avr ISP
2004-03-12 by Capricon
What is the difference between a stk500 and a avr_ISP? Capricon -----Original Message----- From: John Johnson [mailto:johnatl@mac.com] Sent: Friday, March 12, 2004 4:12 AM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Avr ISP It's kind of like being able to download softwa
Re: [AVR-Chat] It just rests
2004-03-12 by JChavez@soboce.com
I forgot to mention a normal computer power supply feeds my board. Do you think I still need the bypass caps? JAvier VA3TO con fecha 11/03/2004 02:03:14 p.m. Por favor, responda a AVR-Chat@yahoogroups.com Destinatarios: AVR-Chat@yahoogroups.com CC: Asunto: Re: [AVR-Chat] It just
RE: [AVR-Chat] Avr ISP
2004-03-12 by Capricon
What are the advantages of having ASP_IVR over just having an STL_500? Capricon -----Original Message----- From: John Johnson [mailto:johnatl@mac.com] Sent: Friday, March 12, 2004 4:12 AM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Avr ISP It's kind of like being able to
Re: [AVR-Chat] Digest Number 635
2004-03-12 by Mark Weston
The ISP is so that you can do In System Programming. The AVR-ISP I just received comes with the standard 6 and 10 pin programming cables, and attaches to the RS232 port of your PC or Mac to program the chip. It's not like the STK500 development board, there are no lights or butto
Re: [AVR-Chat] Hello and EMI/RFI
2004-03-12 by John Johnson
On Thursday, Mar 11, 2004, at 09:32 US/Eastern, Kathy Quinlan wrote: >> From: John Johnson [mailto:johnatl@mac.com] >> Hello! > > Welcome to our list. >> I have two designs that use an AVR. One is a garage door >> manager, using >> a 2313, keypad, dip relay driven by a transistor
Re: [AVR-Chat] Avr ISP
2004-03-12 by John Johnson
It's kind of like being able to download software from the internet for you PC, as opposed to taking out your hard drive, putting it in a dedicated programmer, then putting it back in the PC. With ISP, I can take my laptop to one of my designs, hook up a cable, download the progr
Re: Avr ISP
2004-03-12 by poitsplace
--- In AVR-Chat@yahoogroups.com, "Capricon" wrote: > Does anyone know why do we need AVR ISP IN-System programmer? Well...for one thing it makes REGULAR programming a heck of a lot easier
Avr ISP
2004-03-12 by Capricon
Does anyone know why do we need AVR ISP IN-System programmer? Capricon
Reading program memory...
2004-03-11 by bryant_bob
Hi, I want to have a function that will do a simple 16-bit check of the DATA Program Memory (ROM). Does anyone have an example of such code? FYI: I'm using the ICCAVR C-Compiler e.g. for(pointer to start of ROM; pointer
RE: [AVR-Chat] Re: Butterfly
2004-03-11 by Cobb, Quentin
> There are a few AVR based bot controllers out there. Yeah I know, I've designed one too. It's just that the Butterfly is A) cheap B) completely self contained C) has an LCD Panel, speaker, Joystick, light sensor etc. D) small Cramming all that stuff onto a board using 0.1" thro
Re: [AVR-Chat] It just rests
2004-03-11 by VA3TO
Oops...that's bypass, not baypass :) VA3TO wrote: >How about baypass caps on the uC power supply pin(s) ? >And what are you using for a reset circuit ? >Hugh > > >JChavez@soboce.com wrote: > > > >>I made a little project using the atmega8515, it runs nicely however when >>someone
Re: [AVR-Chat] It just rests
2004-03-11 by VA3TO
How about baypass caps on the uC power supply pin(s) ? And what are you using for a reset circuit ? Hugh JChavez@soboce.com wrote: >I made a little project using the atmega8515, it runs nicely however when >someone turns on a drill that's one meter far away the uc resets. Then I
It just rests
2004-03-11 by JChavez@soboce.com
I made a little project using the atmega8515, it runs nicely however when someone turns on a drill that's one meter far away the uc resets. Then I realize that the mc resets all the time a big motor starts. Is there something I should consider? Javier Chavez
Re: [AVR-Chat] Re: Speed Trap
2004-03-11 by Mike Murphree
William Nachefski said: > I wonder if a hall sensor would work. Or better yet, what about a > laser beam. I saw a couple of those laser modules at radio shack the > other day (cheap too :) That would cut down reaction time. As for AVR, > I will use the mega8, I have a bunch of th
RE: [AVR-Chat] Hello and EMI/RFI
2004-03-11 by Kathy Quinlan
> -----Original Message----- > From: John Johnson [mailto:johnatl@mac.com] > Sent: Thursday, 11 March 2004 8:59 PM > To: AVR-Chat@yahoogroups.com > Subject: [AVR-Chat] Hello and EMI/RFI > > > Hello! Welcome to our list. > I'm JJ, AVR, electronics, machinist type person. It's good
Re: Speed Trap
2004-03-11 by William Nachefski
I wonder if a hall sensor would work. Or better yet, what about a laser beam. I saw a couple of those laser modules at radio shack the other day (cheap too :) That would cut down reaction time. As for AVR, I will use the mega8, I have a bunch of those laying around. --- In AVR-Ch
Hello and EMI/RFI
2004-03-11 by John Johnson
Hello! I'm JJ, AVR, electronics, machinist type person. It's good to find a resource for AVR folks. I have two designs that use an AVR. One is a garage door manager, using a 2313, keypad, dip relay driven by a transistor. On occasion it would just "go nuts." The door would start
Re: [AVR-Chat] Speed Trap
2004-03-11 by Bernd Felsche
On Thursday 11 March 2004 10:09, Ken Holt wrote: > At 09:21 AM 3/11/2004 +0800, you wrote: > >I've thought of using a soap bubble instead; triggering when the > >refraction through or reflection from the bubble changes. > > > >Make sure that the air isn't moving too much around t
Re: [AVR-Chat] Speed Trap
2004-03-11 by Ken Holt
Since every wacky idea is being offered: Use an accelerometer in the cannon itself to measure recoil momentum. If the mass of the projectile is known, then the exiting velocity is also known. Ken At 09:21 AM 3/11/2004 +0800, you wrote: >On Thursday 11 March 2004 01:05, Dave VanHo
Re: [AVR-Chat] Speed Trap
2004-03-11 by Bernd Felsche
On Thursday 11 March 2004 01:05, Dave VanHorn wrote: > >So you see, the biggest problem in accuracy is to positionning > >exactly the sensors. > >Far distance between the sensors, better accuracy. > Matching the optos will also be a problem. They aren't known for > speed either,
Re: [AVR-Chat] Re: Speed Trap
2004-03-11 by Bernd Felsche
On Wednesday 10 March 2004 23:42, Clark, Andy wrote: > > Bullets are typically fast, designing around 1400M/S at the high end But the AVR is faster than a speeding bullet. :-) > You need to start somewhere so try over the top, using Timer1 of a Mega8 > running at 16MHz - before f
Atmel AVR Wireless Development Kit Needed!
2004-03-10 by Zheng Anding
Hi All, Currently I'm looking for a development kit for Atmel AVR with 802.11 embedded. I need this kind of board to start my wireless developping project on PocketPC. I've a STK500 on hand. I dont know if anyone would kindly recommend a AVR board with 802.11 embedded which can b
Re: [AVR-Chat] Re: Speed Trap
2004-03-10 by Dave VanHorn
At 09:23 PM 3/10/2004 +0000, William Nachefski wrote: >Wow! what a response. Actually my tolerances are quite large, + or - > say 10 m/sec. As for placement of the sensors I have no set length >yet, I just threw 1" as an arbitrary number. What distance would be >best? I do intend
STK500 compatible Programer
2004-03-10 by Salam
Hi I wish to build something like the STK500 to be compatible with code vision avr. can you help please?? thanx
Re: Speed Trap
2004-03-10 by William Nachefski
Wow! what a response. Actually my tolerances are quite large, + or - say 10 m/sec. As for placement of the sensors I have no set length yet, I just threw 1" as an arbitrary number. What distance would be best? I do intend to condition the signal of the sensors before the uC. As f
Re: Serial to ethernet Converter
2004-03-10 by Phil
I've not used this product but when I suggested it in response to a similar question in another group several people jumped all over me about how poor quality lantronix products had. Based on specs alone, it looks good. Not sure about the price but recall it being in the $50 rang
Re: Speed Trap
2004-03-10 by upand_at_them
Agreed. But I was giving an example of the math to show that the AVR is indeed fast enough to time. 1400m/s, or about 3000 MPH, is still doable with even a slow processor. Mike --- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > At 05:34 AM 3/10/2004 +0000, upand_at_them wrote
Re: [AVR-Chat] Re: Butterfly
2004-03-10 by Dave VanHorn
At 05:03 PM 3/10/2004 +0000, chrltn101 wrote: >Many thanks Cobb, My project is more along the the line of signals so >a large number of i/o and adc ports isn't on the top of my list. It is >too bad that Atmel didn't open more of the ports up for the robotics >engineer. The butter
RE: [AVR-Chat] Speed Trap
2004-03-10 by LightYearCS
Depends on what the tolerances are. I think I'll just stick to asking questions. I'm mainly here to learn about AVR. I'm setting up a port for the uC/OS-II Real Time Operating System. We looked at AVR and thought it would be an excellent platform for our product. Good luck with t
Re: [AVR-Chat] Speed Trap
2004-03-10 by Dave VanHorn
> >So you see, the biggest problem in accuracy is to positionning exactly the >sensors. >Far distance between the sensors, better accuracy. Matching the optos will also be a problem. They aren't known for speed either, though that's solveable. Breaking tensioned wires might be a
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by LightYearCS
Now what did I say? Small quantities? Signal Conditioning? Key Debouncing? My Honest Opinion?? :-) heh Don't worry about it, you're right. There are lots of canned library routines for keyboard scanning. Although in the case of including a display, you will need a driver. So as l
Re: [AVR-Chat] Speed Trap
2004-03-10 by Wagner Lipnharski
LightYearCS wrote: > You would most likely need a high speed timer to do this. The > microprocessor can read the results but I'm not sure if the built in > timers would be fast enough to record the events. You would have to > define the parameters regarding accuracy. > > > > What
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by Dave VanHorn
At 08:34 AM 3/10/2004 -0800, LightYearCS wrote: >Actually, sales of these parts seem to be quite brisk even though its a >relatively old part. > >Of course, in larger quantities, most likely I would have my CPU/MCU >perform the keyscan, but when it comes to say building 100 devic
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by LightYearCS
Actually, sales of these parts seem to be quite brisk even though it’s a relatively old part. Of course, in larger quantities, most likely I would have my CPU/MCU perform the keyscan, but when it comes to say building 100 devices, sometimes it just not worth the extra software ef
Re: Butterfly
2004-03-10 by chrltn101
Many thanks Cobb, My project is more along the the line of signals so a large number of i/o and adc ports isn't on the top of my list. It is too bad that Atmel didn't open more of the ports up for the robotics engineer. The butterfly would indeed be a great platform to start from
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by Dave VanHorn
At 06:18 AM 3/10/2004 -0800, LightYearCS wrote: >Actually, using findchips.com, I noticed the MM74C923 and MM74C923 arent >cheap either at $6.82 US in small quantities. Which is why we use micros, and why such chips have very limited sales. :)
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by Clark, Andy
> Bullets are typically fast, designing around 1400M/S at the high end You need to start somewhere so try over the top, using Timer1 of a Mega8 running at 16MHz - before firing, clear Timer1, sit in a tight asm loop looking for your first edge (it's probably best to feed your two
RE: [AVR-Chat] Re: Speed Trap
2004-03-10 by LightYearCS
Actually, using findchips.com, I noticed the MM74C923 and MM74C923 aren't cheap either at $6.82 US in small quantities. Barry -----Original Message----- From: upand_at_them [mailto:upand_at_them@yahoo.com] Sent: Tuesday, March 09, 2004 9:34 PM Subject: [AVR-Chat] Re: Speed Trap E
RE: [AVR-Chat] New file uploaded to AVR-Chat
2004-03-10 by LightYearCS
I've been looking for something like this. I'm using a MAX6954 which has a keyboard encoder and will drive up to 128 discrete LEDs including 7, 14, and 16 segment LEDs. The part has an SPI interface. Do you know of a Keyboard Encoder with an SPI interface like the one you uploade
Re: [AVR-Chat] Re: Speed Trap
2004-03-10 by Dave VanHorn
At 05:34 AM 3/10/2004 +0000, upand_at_them wrote: >Even a slow processor should be fast enough. Let's look at the >math... > >An object going 100 MPH will travel 1 inch in 0.568 ms. Assuming a >slow 1 MIPS processor, you'd get 568 instructions (counts) in that >time. Bullets are
Re: [AVR-Chat] Speed Trap
2004-03-10 by MuRaT KaRaDeNiZ
if the projectile shows magnetic properties, may be you can use another coil, through which the projectile will travel, and the induced voltage can be recorded by a peak detector circuit. --- William Nachefski wrote: > I need some way of measuring/displaying velocity of > a proje