Flashy Mike wrote:

I hope you connected positive and negative correctly.

 
Connection is correct 

Flashy Mike wrote:

Check the voltage at the Attiny

 
It is 4v, shouldn't it be same as terminals?  

Flashy Mike wrote:

then - perhaps the schottky diode is defect.

 
What should I check? 

Flashy Mike wrote:

You might also have left a solder bridge somewhere. Check all pins against their neighbors for shorts.

No shorts, pin 3 and 4, are shortly beeps and also 7 and 8 but it is the same with my other (new) driver

Flashy Mike wrote:

YuvalS wrote:

Flashy Mike wrote:

I hope you connected positive and negative correctly.

 
Connection is correct 

Flashy Mike wrote:

Check the voltage at the Attiny

 
It is 4v, shouldn't it be same as terminals?  

Flashy Mike wrote:

then - perhaps the schottky diode is defect.

 
What should I check? 

Flashy Mike wrote:

You might also have left a solder bridge somewhere. Check all pins against their neighbors for shorts.

No shorts, pin 3 and 4, are shortly beeps and also 7 and 8 but it is the same with my other (new) driver

The voltage at the Attiny should be about 0.3 Volts less than at the cell due to the diode. You might have disconnected a pin of the Attiny when you unsoldered the wires. Or it might be fried but they are pretty tough. Difficult to say what more could be damaged, perhaps if you post a picture.

 

Thanks Mike, 
I think it might be the diode.

I didn't desolderd the wires from the MCU, I keep them soldered in order to continue practicing flashing code. I only disconnect the wires from the Arduino board when connecting to battery.

I didn't notice the diode is in series to MCU, so when connecting to Arduino 5v I connected id directly to pin 8 

mrheosuper wrote:

Do you flash right fuse?

 

Actually I don't know, the code sayes:

FUSES
 *      I use these fuse settings
 *      Low:  0x75  (4.8MHz CPU without 8x divider, 9.4kHz phase-correct PWM or 18.75kHz fast-PWM)
 *      High: 0xfd  (to enable brownout detection)

But I can't find where it is burned to the MCU 

http://bazaar.launchpad.net/~toykeeper/flashlight-firmware/trunk/view/he...

 

mrheosuper wrote:

Do you flash right fuse?

After some reading in the Attiny Datasheet and other sources about the fuse, mrheosuper was correct and the problem was in the fuse settings.

In case, someone will have the same problem in the future:

The tutorials on the web for flashing MCU using Arduino include burning bootloader. During the burning of bootloader the fuse is also burned.
In order to use the same fuse settings as toykeeper set the BOD to 1.8v and clock to 4.8 MHz internal (under tools menu at the Arduino IDE).

Thanks mrheosuper for the Tip.