diy atmega8 arduino not uploading. please help!

[system]

When i found the http://arduino.cc/en/Tutorial/ArduinoISP tutorial i wanted to make my own stand alone arduino.
I bought a couple of atmega8s and put the bootloader on them with my arduino mega2560.
That worked fine and i can see the bootloader working on my diy arduino.(three flashes of the led).
But i cant get it to upload a sketch to it.
When i try to upload it's saying: avrdude: stk500_getsync(): not in sync: resp=0x00
Does anyone know how to get it working propperly?

The complete diy arduino is based on : http://arduino.cc/en/Main/Standalone

thanks for looking into it!

[system]

Need a little more information... Which USB2UART are you using? Which board did you use?

Here is the Old Version (boards.txt)

atmega8.name=Arduino NG or older w/ ATmega8

atmega8.upload.protocol=arduino
atmega8.upload.maximum_size=7168
atmega8.upload.speed=19200

atmega8.bootloader.low_fuses=0xdf
atmega8.bootloader.high_fuses=0xca
atmega8.bootloader.path=atmega8
atmega8.bootloader.file=ATmegaBOOT.hex
atmega8.bootloader.unlock_bits=0x3F
atmega8.bootloader.lock_bits=0x0F

atmega8.build.mcu=atmega8
atmega8.build.f_cpu=16000000L
atmega8.build.core=arduino
atmega8.build.variant=standard

But, if you used Optiboot you are going to need to create an Atmega8-UNO entry.

Pictures of you project can be helpful

[system]

thanks for your reply!

I used my arduino mega2560 to bootload the atmega8.
I made some pictures but i don't know how to upload them here.
for uploading my sketches I use: CP2102 USB to TTL Converter Module which i bought from here: Jtron 2272-M4 Non-lock 4-Way Wireless Remote Control Module w / Receiving Panel - Free shipping - DealExtreme

is it possible I somehow burned out my atmega?

[system]

I used my arduino mega2560 to bootload the atmega8.

Okay... so you used the Arduino as ISP? Which board did you select (i.e. which bootloader did you put on the ATmega8?)?

I made some pictures but i don't know how to upload them here.

The little arrow with the orange text "Additonal Options..."

CP2102 USB to TTL Converter Module which i bought from here:

Cool, at least this CP2102 has the DTR/RST broke out. Did you install the driver?

Silicon Labs

Did you put a 0.1uF capacitor between RST on the USB2UART and pin 1 on the Atmega8? This allows the auto-reset, other than that, you will have to use the reset button just before the upload (when the sketch size appears).

is it possible I somehow burned out my atmega?

It is always possible But I do not think we can make that determination, unless you have already release the "blue smoke" from the chip.

[system]

I uploaded the isp sketch on my Mega2560 and then selected the atmega8 as board. for programmer is choose arduino as isp.
after that i burned my bootloader.

I did use the RST pin but from now i will! thanks for the suggestion!
I installed the exact driver you were reffering to.

luckily I haven't seen blue smoke yet so it should be able to work

I added two pictures of my PCB and the used hardware.

thanks for the support!

[system]

No problem.

Also, you might want to put a 0.1uF from VCC-GND, AVCC-GND and AREF-GND close to the ATmega8. It will help with high frequency noise devices can generate.

[system]

i made the changes u suggested. i now use the RST pin and added 0.1uf capacitors.
i am still no able to upload anything to the atmega8.

any idea what could be the cause of that?

[system]

I can not tell how the USB2UART is hooked up, but if the breakout board is silked correctly, it should be as follows:

3.3V - (Not connected)
RST - Atmega pin 1 thru 0.1uF cap
TX0 - Atmega pin 2 (RX0)
RX0 - Atmega pin 3 (TX0)
GND- Ground
5V - Vcc

I see this USB2UART has a PWR and TX LED, is there any activity on the TX when you upload?

[system]

i tried it a couple of times like that but it's not working.
the USB2UART i'm using is slitchly different than the one in the link.
it is the one i ordered but apperently it has changed.
mine doesn't have a TX led.

[system]

Well that is unfortunate. Lets try a manual reset. When you press the upload button and the IDE compiles the sketch, press and hold the reset button down until the Binary Sketch Size: 1,234 bytes appears in the IDE window and then release the reset button. There is a fussy timing of this, so a few tests may be needed (delaying release 100-500ms after the Binary Sketch Size). Some people prefer just pressing it when the Binary Sketch Size appears.

It is a little easier with both RX and TX leds.

[system]

after trying all you have said i found out that my USB2UART was wrong.
The TX and RX outputs where wrong. By changing the cables it's working now!
thanks for all the help!

René

[system]

Yeah, some of those boards are silked wrong. This would number three that I heard of.

Enjoy.