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16  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: From Atmega8 to Atmega168 on: March 04, 2007, 11:03:36 pm

You can only use that cable to upload the bootloader to the atmega8 and not the 168 through the IDE the last time i checked!

17  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: From Atmega8 to Atmega168 on: February 07, 2007, 12:55:03 am

I assume you have physically replaced the atmega8 with the atmega168 chip on your arduino board, and then selected the atmega168 in the IDE and are still having problems.

Q: Have you just bought the atmega168 from an online website? (in which case it will NOT have the arduino bootloader on it, which is essential).

Getting the bootloader on the chip is a painful and/or expensive thing to do for beginners. I would suggest you buy a pre-bootloaded 168, you will find some links on the forum

18  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: motors with accurate position and speed contro on: January 28, 2007, 09:55:34 pm
a modded hitec hs-300 servo motor, and while it delivers continuous rotation and accurate enough positioning, the speed control is quite limited.


Sadly i dont have any more suggestions than Daniel - a stepper or a rotary encoder seem to be your best bets.

Perhaps you can tell us a little more about the application, and we could suggest a better system (for eg. putting a rotary encoder on the object the motor is turning instead of on the motor driveshaft)

Also, could you please give me some more information as to how the servo was hacked...the more detailed the better!

19  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino bluetooth on: January 18, 2007, 06:14:18 pm

No mention of current status or possible launch date?  :-[

20  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino bluetooth on: January 09, 2007, 05:48:48 am

So in another post on the forum i found a link to Massimo's blog which has a bit about the arduinoBT (

I guess it is based on the ATmega168 fyi.

And more news and updates (especially on when it is likely to be available) from the powers that be would be most welcomed!


ps - Also great to see that a S60 cellphone (Nokia 6630 - same one that i have!) is being used. Now i just have to learn python...seems like a straightforward language...!
21  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino bluetooth on: January 05, 2007, 03:07:39 pm

I am really keen on buying an arduino as well (probably the mini), but i am considering sacrificing size and weight in order to be able to flash it via bluetooth as the controller will probably be within a flying object... smiley-grin

As per this thread >>  (reply #4)
The whereabouts of the elusive arduinoBT should have been a little clearer quite some time ago... ?

I was just hoping that the Forum Admin could give us a little more information on -
1. Size of the board
2. # of Analog In pins
3. # of PWM pins
4. Will the board be able to send serial out to the computer / recieve from the computer while the program is running?
5. Rough date of availability
6. Rough pricing / pricerange?

Thanks a lot!
22  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Basic stamp components on: January 10, 2007, 08:54:49 am
Hi Nabisco,

I am a newbie myself, but since you havent got any replies i will try and give you an answer....(should be fairly true i hope!)

From what i know, any sensor should work with any microcontroller (ie its not like a mac program wont run on a PC).
All sensors usually output in one or the other common forms such as resistive output, analog voltage out, digital out, serial out etc etc

If you need more specific clarification you could post a link to the exact sensor/part you are talking about...

23  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: 9v >> 5v On the MINI  & Atmega8 standalone Qs on: January 07, 2007, 11:49:49 am

I guess you guys can leave out Q6 as i got the answer here -

24  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: 9v >> 5v On the MINI  & Atmega8 standalone Qs on: January 07, 2007, 10:36:50 am
Thanks a ton guys,

@brainfart - i am starting off by putting a gyro on a cheap heli and modulating the tailrotor to keep it from yawing - ( and then will proceed to add on things from there.

@Daniel - Thanks for the info. Good point on the low dropout voltage regulator! thnx. I have a stupid Q regarding the crystal (see #6 below)

@Neilzero - Thanks for that page. It REALLY helped me get a better understanding of most of the concepts of standalone atmega, and a lot of the links on the page were useful too!

Here are a few more Qs i had -

6. Heres the stupid Q - if i use the atmega's internal crystal/oscillator, which i have read is equivalent to 1Mhz, would that mean my atmega will be running at 1/16th the speed compared to if i used an external 16MHz crystal? (So in a sense a 16MHz external cryztal is "overclocking" it?)

7. Mellis mentioned that you can use a Wiring board (which i have) as an AVR-ISP ( Where could i find info on that ?

8. If i program the atmega168 via wiring board, will it be able to put a bootloader on as well as upload the program i write? or will it only do the bootloader and i will have to put it in my arduinoNG to upload the program ?

9. Any useful links of people using gyros with their own microcontrollers in helicopters? or for anything else?

10. Would i be correct to assume that a gryo will only show a rate of change if there is rotational movement about its axis, and not if it is moved around on a horizontal plane without any rotation?

And also, if you guys could help with Q1 & 2 from the original post  smiley-grin
Once i have that figured i will buy my mini! (also would like to buy one of these!! >

Thanks a lot,
Really appreciate the help,

25  Forum 2005-2010 (read only) / Frequently-Asked Questions / 9v >> 5v On the MINI  & Atmega8 standalone Qs on: January 05, 2007, 03:43:48 pm

Hi there,

Im planning to use an arduino mini on a RC helicopter.

1. Would it be possible to run the mini power from a 7.2V battery pack to the +9V of the mini ?
2. Would the arduino mini then output a regulated +5v at any pin so i can run a 5v sensor? (possibly the +5v pin at the top or bottom??)

Also, on another note,
3. if i buy an arduinoNG and flash the program to it, then remove the atmega8 chip can i just connect the corresponding pins as i would the arduinoNG pins ? (ie no need for any other hardware / ?bootloader? etc etc)

4. Does the standalone ATmega8 need exactly 5v to run?
5. And, finally, does just the standalone atmega8 have the ability to convert 7.2V to 5v ? (unlikely eh)

Thanks a lot,
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