Hello guys, i know this problem is kinda common but i had to post it anyway.
Before anything i inform you guys that i change the fuse of my arduino pro 3v3@8MHz to allow 1,8V brownout and also programmed CKDIV8 AND CLKOUT. In others words the configuration is this: E:FE, H:DA, L:3F.
The hardware wire i used is this (ArduinoISP to Arduino pro 3v3@8MHz)
I also used a cap 0,1uF between reset and gnd
After a good time using the Arduino pro without problem some random problems begin to appear when i try to uploading the program with the programmer(Arduino as ISP). So i tried to burn the bootloader again and the follow message appears ""avrdude: Yikes! Invalid device signature."
The same occurs when i try to communicate with avrdude using this command "avrdude -c arduino -p m328p -P COM3 -b 19200 -v"
Some tests i did:
1 - Continuity test directly at uC pins between those signais:
ArduinoasISP | Arduino pro
SCK | SCK,
MISO | MISO,
MOSI | MOSI
/SS | /RESET
No problem good connection
2 - Verified the clock in XTAL1 and XTAL2
XTAL1
XTAL2
3 - Verified the clock in CKOUT (arduino pro pin 2) and measured 1MHz
I also made another's measures using the command "avrdude -c arduino -p m328p -P COM3 -b 19200 -v" in the pins 13(SCK), 12(MISO), 11(MOSI) and /RESET
Pin 13 (SCK)
Pin 12 (MISO)
Strange, is it right ?
Pin 11 (MOSI)
Pin RST (conectado ao pino do ArduinoISP)
4 - Later i tried to use the program "Atmega_board_programmer" from Nick Gammon which before saved my board without clock signal. This time no luck but, for curious i take some measures again using his program in these pin 13(SCK), 12(MISO), 11(MOSI) e /RESET
Pin 13 (SCK)
Pin 12 (MISO)
This signal again ![]()
Pin 11 (MOSI)
Pin RST (connected to arduinoISP pin 10)
4 - I also tried to delay the avrdude using -B5, B10 and another values. With a quick search on google some people are saying that those delays dont work with the arduino as isp
5 - i used some sketchs for slow clocks which i dont remember and no luck
6 - External power and no luck again
Which detail i'm losing ?
Thanks