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1  Using Arduino / Project Guidance / Re: DS1302 inaccurate time on: March 14, 2014, 03:09:54 pm
From ebay or any elecronics parts shop...
2  Using Arduino / Motors, Mechanics, and Power / Re: Strange servo on: October 29, 2013, 02:07:39 pm
I have taken out the servo yesterday as i realized that it screws only to one direction as soon as it gets control signal... I tested the power connection with direct power and ground from the psu to the servo, but exactly the same issue.
May be the servo is bad, but i cannot find out why :S
(I have taken apart th servo - not difficult, 4 screws - i cannot find any failures.)

I have tried the MegaServo library, but no success :S
3  Using Arduino / Motors, Mechanics, and Power / Re: Strange servo on: October 29, 2013, 10:50:14 am
I haven't. I haven't ordered more until i don't see that i need them - now i had to order a spare/replacement one, and as if i will use more servos, i will keep some spares smiley-grin
Worst case is that i'll wait until the next servo arrives, and try to test again smiley
Thanks all all helping smiley
4  Using Arduino / Motors, Mechanics, and Power / Re: Strange servo on: October 29, 2013, 09:03:53 am
OK! I will review the ground wire&connector.
Schematic : imagine as there is a PSU which powers the servo, a servo got the signal from the Arduino, and the PSU and the Arduino is grounded together smiley
5  Using Arduino / Motors, Mechanics, and Power / Re: Strange servo on: October 29, 2013, 08:23:36 am
OK, so that's not the root of the problem. Can be the servo faulty (but why)?
I have tried the supplied Servo Examples, Knob and Sweep, but exactly the same behavior from the servo...
6  Using Arduino / Motors, Mechanics, and Power / Re: Strange servo on: October 29, 2013, 07:45:07 am
Of course! smiley As my earlier test with the servo.
7  Using Arduino / Motors, Mechanics, and Power / Strange servo on: October 29, 2013, 06:19:57 am
Hi,

Previously i have tested my Arduino with a TowerPro Micro 9g servo. it is a general servo, worked fine.

Now i had to use it in a project, (RC car steering smiley-wink ) but it behaves very strange. When i connect to the Arduino without setting the servo up, it does nothing.
But when i connect to a pin, which is set up to a Servo library, it suddenly starts to screw to one end position, which wants to step over, and ignores the commands coming from the Arduino.

What can cause this? I haven't touched the servo for months, after the first test.
Other question, which servo library is suitable for this servo? May i trying wrong one?

Any help will be appreciated smiley
8  Using Arduino / Microcontrollers / Re: Arduino 3,3v program upload on: May 18, 2013, 08:28:45 am
Solved, this was caused by the wrong BODlevel. Factory setting is efuse=0x05 (BODlevel 1,8V) for 3,3V Arduino, but my one starts frm 3,3V only when BODLEVEL is diasbled (efuse=0xff) or is 2,7V (efuse=0x06).
I have written these settings with avrdude on Linux, with DAPA programmer. Don't use uisp for this, it reads/writes wrong values on efuse!
9  Using Arduino / Microcontrollers / Re: Arduino 3,3v program upload on: May 17, 2013, 10:46:38 am
Unfortunately there is a fault, too.
I tried to run the board from many 3,3V sources, but it doesn't do anything.
If i connect 5V to the VCC directly to the board (without stabiliser), it works. But from direct 3,3V, don't.
I tried PC PSU, and USB-TTL converter's 3,3V.

Can someone give me the correct fuse settings for Pro or Pro Mini 3,3V? I used those values from boards.txt. It can be the brownout detection?
10  Using Arduino / Microcontrollers / Re: Arduino 3,3v program upload on: May 16, 2013, 03:11:07 pm
I had many problems with that board in the past, finally it is working now smiley This is why i haven't noticed that tehere isn't a bootloader on it.
11  Using Arduino / Microcontrollers / Re: Arduino 3,3v program upload on: May 16, 2013, 12:46:49 pm
Success! There were no bootloader in it. Last night i tried to upload programs, and i forgot that at last try i used the programmer for upload, and, maybe with wrong fusing, it destroyed the loader smiley-grin
12  Using Arduino / Microcontrollers / Arduino 3,3v program upload on: May 16, 2013, 08:53:58 am
Hi,

I have stuck with a problem... So i will give a big thank to any help...

I'm building a 3,3V Arduino demo board, to use with Nokia LCD projects. I have some 328P's with 5V/16MHz loaders, which i have programmed and used previously in my 5V prototyoping board on 5V.
I have built the board, put the 328 in, burnt the 3,3V bootloaer for Arduino Pro or Pro Mini 3,3V/8MHz, set the fuses. Used Parallel Programmer.
Now i can upload any programs with the programmer, but nothing with my USB-TTL cable, which i use for the 5V version. I uploaded a program with the programmer, which sends data on serial port, and it worked. So serial communication is OK. I think the problem is the computer cannot reset the board.
(Board hasn't got a reset button, but i will put one on it, and try...)
(I added a reset button, but nothing. Arduino IDE says : avrdude: stk500_getsync(): not in sync: resp=0x00 )

Reset circuit is the same on 5V and 3,3V board (10k pullup to the VCC, 0,1uF from reset signal from the cable), and the cable is the same...
Only thing i can think that the pullup resistor is different on the 3,3V version? Can it be?
Should i build a level shifter for 3,3v? But serial communication works...

Thanks for any help smiley
13  Using Arduino / Microcontrollers / Re: Arduino 3v3 building on: May 09, 2013, 02:40:28 pm
Hell's fire!
Solved.
One of the 2 capacitors on the crystal was short. There were no clock...

Thnaks for the help!
14  Using Arduino / Microcontrollers / Re: Arduino 3v3 building on: May 09, 2013, 12:04:42 pm
Tried with Vcc=5V and 3,3V too. Nothing :S
15  Using Arduino / Microcontrollers / Re: Arduino 3v3 building on: May 09, 2013, 10:42:47 am
Hi,

I selected Arduino Pro or Pro Mini, 3,3V/8MHz, with Atmega168

But when i try to read fuses with uisp, the same command which works with the 5V board, it cannot read, and gives back all signatures 0x0ff. I think it cannot communicate.
And i use DAPA programmer, it doesn't use any serial communication, it is on parallel port.
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