Keyboard delay
2005-02-19 by Valerij Avrealij
Hello 2AVR-Chat members. I have interrupt based keyboard inquiry. How much time I need wait after interrupt occurs and keyboard inquiry? Thanks. -- Valerij Avrealij
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RE: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Robert Adsett
At 07:33 PM 2/19/05 +0000, Doug Locke wrote: >I am sure that one of the hardware gurus will be able to clarify things >more and correct me if wrong, but on first looks the circuit in the pdf >looks incorrect to me if all the mosfets are the same. If I remember >correctly, the ide
Re: [AVR-Chat] A Question About I2C and SMBUS
2005-02-19 by Daniel Adolfsson
Tanks for the reply I realy haven't decided on which avr, probably one of those with internal 8Mhz operation, I will look in to the links you sent later. Is the smbus system designed so that multiple masters can exist on the same bus? i don't want to damage my southbridge. >What
Re: [AVR-Chat] avrexplorer
2005-02-19 by Jim Wagner
There is a good list of C-language (for AVR) tutorials in the main AVR formum of AvrFreaks.net. http://www.avrfreaks.net Jim On Sun, 20 Feb 2005 03:40:17 +1300 Eric wrote: > > C is good, but it is not all that hard in assemly code, > and I belive that sometimes you need to call u
RE: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Richard Reeves
Doug: > I am sure that one of the hardware gurus will be able to clarify > things more and correct me if wrong, but on first looks the circuit in > the pdf looks incorrect to me if all the mosfets are the same. If I > remember correctly, the idea of the H configuration is to have
RE: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Doug Locke
Hello Ben I am sure that one of the hardware gurus will be able to clarify things more and correct me if wrong, but on first looks the circuit in the pdf looks incorrect to me if all the mosfets are the same. If I remember correctly, the idea of the H configuration is to have one
AVR ISP ATAVRISP
2005-02-19 by vifra gomez
warning:signature does not match selected device i have the next problem..i have the avr studio last new version.and my avrisp with v2 firmware.... i cant program the chips that i want to burn....(AT90s1200) and (at90s2313) in the program in advanced option i try to read the sign
RE: [AVR-Chat] A Question About I2C and SMBUS
2005-02-19 by wbounce
What AVR? www.AVRFreaks.net as examples of I2C or it is also referred to TWI (two wire interface) For winavr and a atmega128 there are some examples at Brian Dean's website http://www.bdmicro.com/code/ There is a i2cScan, srf08, cmp03 all have I2c code in them. -----Original Mess
RE: [AVR-Chat] Have someone can share example ?
2005-02-19 by wbounce
For a atmega 128 gcc void initmotor(void) { /* use fast PWM mode 10 bit with toggle on compare Reference pages 130 table 58 Page 133 table 61 f OCn = f clk_I_O ------------- N * (1 + TOP) f clk_I_O = 16000000 Top can be either ff ( 255) for mode 5 1ff ( 511) for mode 6 3ff (1023)
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Roy E. Burrage
Dave, Your test plan looks good, but as someone else asked...are you sure you're turning your MOSFETs on? REB velo1_4mb wrote: --- In AVR-Chat@yahoogroups.com , Robert Adsett wrote: At 09:11 PM 2/18/05 -0500, Ben Matthews wrote: I am a 15 year old high school student using a tiny
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Robert Adsett
At 10:49 AM 2/19/05 -0500, Robert Adsett wrote: >Um, how are you getting the 10V to drive the gates then? I don't believe >either of these devices are logic level devices and while they will sort of >work at 5V it is asking for trouble. More importantly the high sides need >to ru
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Robert Adsett
At 02:00 PM 2/19/05 +0000, velo1_4mb wrote: >--- In AVR-Chat@yahoogroups.com, Robert Adsett >wrote: > > At 09:11 PM 2/18/05 -0500, Ben Matthews wrote: > > >I am a 15 year old high school student using a tiny 26 on an >odyssey > > >of the mind project (we have a competition next w
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Mitch Stein
David Kelly wrote: On Feb 19, 2005, at 8:00 AM, velo1_4mb wrote: Put a 300-500 ohm resistor between the buffer and the MOSFET gate to limit current when the failure occurs. Not only that but it will provide a shunt which allows one to measure the current. Most any time I think th
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by Ben Matthews
Thanks for all the help so far. i am going to add the resistors in a couple minutes, all my electronics stuff is over in our Odyssey of the mind room. i have a hand drawn scematic which i scanned. http://benlinuxisbest1.tripod.com/hbridge.pdf if any one wants to take a look. Ben
Re: [AVR-Chat] avrexplorer
2005-02-19 by Eric
C is good, but it is not all that hard in assemly code, and I belive that sometimes you need to call up Assembly type code from your C program, because it can not be done any other way. I am not sure what is avalible in the electronic (ebook type, web) tutorial world, I think at
Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-19 by David Kelly
On Feb 19, 2005, at 8:00 AM, velo1_4mb wrote: > Put a 300-500 ohm resistor between the buffer and the MOSFET gate to > limit current when the failure occurs. Not only that but it will provide a shunt which allows one to measure the current. Most any time I think the circuit can s
A Question About I2C and SMBUS
2005-02-19 by Daniel Adolfsson
Hi, I have been a member of this group for a while now, I cant remember if I have ever written anything before though. But hers my question: I recently purchased a EPIA M1000 (a micro itx board with a 1 GHz processor) this board has some really useful interfaces but the one that
the Keyboard
2005-02-19 by Eric
Hi all Just a note to say I am making good progress on the keyboard, not too sure if my code is "tidy" way of doing it. but it is almost 2.30am on Sunday morning in "Kiwi" land and I must do some other Email to do with work before I go to bed. The other day I had a lot of "Instru
Re: Motor Control Problems - more info
2005-02-19 by velo1_4mb
--- In AVR-Chat@yahoogroups.com, Robert Adsett wrote: > At 09:11 PM 2/18/05 -0500, Ben Matthews wrote: > >I am a 15 year old high school student using a tiny 26 on an odyssey > >of the mind project (we have a competition next week :) ). This is Ben's father. A little more info. B
avrexplorer
2005-02-19 by mehdy jadidi
hi every body i have avr studio 4.2 and i need to write my program in C because i dont know asm... if you can do it please email me how can i do it and if you have ebooks in this subject i need it more please help me Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term'
Re: need help programming / project
2005-02-19 by Joe
How about magnets on one side and reed switches or halleffect sensors on the other side? JoeT --- In AVR-Chat@yahoogroups.com, "Dave Mucha" wrote: > > --- In AVR-Chat@yahoogroups.com, "Stefan Trethan" > wrote: > > On Fri, 18 Feb 2005 16:49:29 -0000, Dave Mucha > > wrote: > > > >
Re: [AVR-Chat] Motor Control Problems
2005-02-19 by Robert Adsett
At 09:11 PM 2/18/05 -0500, Ben Matthews wrote: >I am a 15 year old high school student using a tiny 26 on an odyssey >of the mind project (we have a competition next week :) ). we are >building a vehicle based on an 18 volt drill motor. i have built an H >bridge based on the desi
Re: [AVR-Chat] Motor Control Problems
2005-02-19 by Robert Adsett
At 09:11 PM 2/18/05 -0500, Ben Matthews wrote: >I am a 15 year old high school student using a tiny 26 on an odyssey >of the mind project (we have a competition next week :) ). we are >building a vehicle based on an 18 volt drill motor. i have built an H >bridge based on the desi
Re: [AVR-Chat] Motor Control Problems
2005-02-19 by Ivan Vernot
Hi Ben, I don't have the book so I can't comment on whether the circuit is correct - so for now lets assume it is. Can you explain in more detail how the 74HC244 is connected to your H bridge and a little more detail about how the AVR is connected to the 74HC244. If I understand
Re: [AVR-Chat] Motor Control Problems
2005-02-19 by Lee Leathers
The 18v drill motor is dc right ;) I opened up the datasheet on the k2232, and you look fine with using that (max 60v 25amps). hmm.. dunno.. but there are geniuses around here.. so they will know something Lee ----- Original Message ----- From: Ben Matthews To: AVR-Chat@yahoogrou
Motor Control Problems
2005-02-19 by Ben Matthews
Hi, I am a 15 year old high school student using a tiny 26 on an odyssey of the mind project (we have a competition next week :) ). we are building a vehicle based on an 18 volt drill motor. i have built an H bridge based on the design on page 263 of "The Robot Builder's Bonanza"
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-19 by Russell Shaw
Eric wrote: > Oh-dam-it > I forgot to say I was going to focus on the assembly code for now, and try out my C coding after the book > comes, that Amazon stuff up really got me worked up, I just got a email to say one two piece order is on > the way. I hope they picked up the doub
Re: [AVR-Chat] The keyboard
2005-02-18 by Jesper Hansen
> Were you say "Set values 0xE0, 0xD0, 0xB0, 0x07 on PA4..7 and watch PA0..3 > for a low to > see which key is was." > I think there is a typing error and 0x07 should be 0x70, Oops, yes, it has to be 0x70 ofcourse. The idea is to just have a single row low. > But I was thinking o
Re: [AVR-Chat] need help programming / project
2005-02-18 by Dave VanHorn
> >I am looking for someone who can lay out the curcuit, schematic, >program the micro test it. Well, that's the sort of thing I do.. I've watched the emails, but I'm just getting back up to speed. Sounds like you're not married to a particular technology, but the requirements ar
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Eric
Hi again By the way Application notes AVR242 on page 4 has a interesting four digit 7 segment LED, 4*4 keyboard with a AT90S1200 but it uses two ports B & D. not that I would use it, it is just food for thought. From Eric ----- Original Message ----- From: "Eric" To: Sent: Saturd
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Stefan Trethan
On Sat, 19 Feb 2005 09:41:45 +1300, Eric wrote: > I'm confused Stefan > why switch the rows from output to input & Columns from input to output? > it just sounds like a waste of > software space for what it is worth. > From Eric Well, i thought it is needed? How would i know whic
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Dave VanHorn
At 03:39 PM 2/18/2005, Stefan Trethan wrote: >On Fri, 18 Feb 2005 15:34:36 -0500, Dave VanHorn >wrote: > > > > >> > >> I am currently making something with a 3x4 keyboard. > >> I have connected the 3 columns to the 3 external iterrupts, and the 4 > >> rows > >> to I/O. > >> The p
Re: [AVR-Chat] Re: need help programming / project
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 20:28:29 -0000, Dave Mucha wrote: > > yes, postioning and alignment can be guaranteed. One option is to > align them with dimples and to connect them with magnets. > Dave :-))) i can imagine something really nice with small neo magnets. place 2 in each device,
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Eric
I'm confused Stefan why switch the rows from output to input & Columns from input to output? it just sounds like a waste of software space for what it is worth. From Eric ----- Original Message ----- From: "Stefan Trethan" To: Sent: Saturday, February 19, 2005 9:28 AM Subject: Re
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 15:34:36 -0500, Dave VanHorn wrote: > >> >> I am currently making something with a 3x4 keyboard. >> I have connected the 3 columns to the 3 external iterrupts, and the 4 >> rows >> to I/O. >> The plan is to set the column pins (interrupts) to pullup, and input
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Dave VanHorn
> >I am currently making something with a 3x4 keyboard. >I have connected the 3 columns to the 3 external iterrupts, and the 4 rows >to I/O. >The plan is to set the column pins (interrupts) to pullup, and input, and >the rows to output, low. >My hope is when someone presses a key
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 15:16:04 -0500, Dave VanHorn wrote: > > The easy way to do a matrix keyboard, is to take rows (or columns) and > make > them inputs pulled up, and take the other side (col or row) and make them > the scanned outputs, active low. > So, when you are seeing all h
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Dave VanHorn
At 02:40 PM 2/18/2005, Eric wrote: >Oh-dam-it >I forgot to say I was going to focus on the assembly code for now, and try >out my C coding after the book >comes, that Amazon stuff up really got me worked up, I just got a email to >say one two piece order is on >the way. I hope th
Re: [AVR-Chat] Re: need help programming / project
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 19:26:17 -0000, Dave Mucha wrote: > > IR would be fine, prefer to have extreemly close and not something > that would work more than an inch apart. > And, yes, each unit will have a battery. Most likely a flat cell > phone batt or similar > Dave I think coils
Re: Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Eric
Oh-dam-it I forgot to say I was going to focus on the assembly code for now, and try out my C coding after the book comes, that Amazon stuff up really got me worked up, I just got a email to say one two piece order is on the way. I hope they picked up the double order mistake. Fr
Amazon Re: [AVR-Chat] The keyboard
2005-02-18 by Eric
Thank you for your response I have that book "Embedded C Programming and the Atmel AVR" Barnett, Cox & O'Cull A Thomson - Delmar Learning Publication ISBN: 1401812066 coming from Amazon UK last night, I wanted two things, I stuffed the order up and could not cancel the mess up I
Re: need help programming / project
2005-02-18 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, "Stefan Trethan" wrote: > On Fri, 18 Feb 2005 19:26:17 -0000, Dave Mucha > wrote: > > > > > IR would be fine, prefer to have extreemly close and not something > > that would work more than an inch apart. > > And, yes, each unit will have a battery
Re: [AVR-Chat] The keyboard
2005-02-18 by Eric
Thanks Jesper I know my circuit was a bit bare & rude, and could not get any ruder, I did think about the short on the output lines killing a micro port, but mainly the port has the ADC on them, The read made module from http://www.futurlec.com/ has the buzzer on port D and the r
Re: need help programming / project
2005-02-18 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, "Stefan Trethan" wrote: > On Fri, 18 Feb 2005 18:14:31 -0000, Dave Mucha > wrote: > > > > > The mating would be by being next to each other. maybe a contact > > type connection, but not plugs or any type of protruding contacts. > > Think of a deck
Re: [AVR-Chat] Re: need help programming / project
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 18:14:31 -0000, Dave Mucha wrote: > > The mating would be by being next to each other. maybe a contact > type connection, but not plugs or any type of protruding contacts. > Think of a deck of cards that would be flat and need to touch to be > identified. (rea
Re: need help programming / project
2005-02-18 by Dave Mucha
--- In AVR-Chat@yahoogroups.com, "Stefan Trethan" wrote: > On Fri, 18 Feb 2005 16:49:29 -0000, Dave Mucha > wrote: > > > > > It would be that one part would be connected to another of about 40 > > possible combinatoins, and only if it is correct would the thing > > work. say, lig
Re: [AVR-Chat] need help programming / project
2005-02-18 by Stefan Trethan
On Fri, 18 Feb 2005 16:49:29 -0000, Dave Mucha wrote: > > It would be that one part would be connected to another of about 40 > possible combinatoins, and only if it is correct would the thing > work. say, light an LED or something. > I'm thinking when the two parts meet, they bo
need help programming / project
2005-02-18 by Dave Mucha
Hi all, I am in need of a circuit that can detect mating to another part. Think door lock and keys, or party favors... ?? It would be that one part would be connected to another of about 40 possible combinatoins, and only if it is correct would the thing work. say, light an LED o
Re: [AVR-Chat] The keyboard
2005-02-18 by Jose Fuentes
I recommend you to use at least 330 ohms resistors on all the pins used for the keyboard. Otherwise you could unintentionally damage the ports, for instance you could inadvertedly put all the pins as ouputs and make a short-circuit with the switches. I would scan the keyboard thi
RE: [AVR-Chat] The keyboard
2005-02-18 by Javier Fiasche
i thing you should send a 1 to one row, scan the columns, and then send another 1 to the next row, not just send all the 4 1s to all the row at the same time Here goes the code for a working 4*7 matrix keyboard /*-------------------------------------------------------------------