[Tutorial] How to burn 1Mhz & 8Mhz bootloader using Arduino IDE 1.6.5-r5

[electrik]

@emre299 Did you changed the upload speed in boards.txt?
See in the first message of this topic
https://forum.mysensors.org/uploads/files/1454449114161-9.png

[evb]

@electrik said in [Tutorial] How to burn 1Mhz & 8Mhz bootloader using Arduino IDE 1.6.5-r5:

@emre299 Did you changed the upload speed in boards.txt?
See in the first message of this topic
https://forum.mysensors.org/uploads/files/1454449114161-9.png

@emre299 did use the Minicore project, so that is different. See my comment just above his.

@emre299 can you describe the steps you did? step by step
Which version of Arduino IDE did you use?
Without more information, it will be difficult to respond to your question.

[emre299]

Hi @evb and @electrik ,

First of all, for checking purposes, i installed the blink code to pro mini 3,3V with the ISP method(arduino nano). My goal is not to use the stupid booster circuit and using arduino up to 1.8v
I added arduino ide(1.8.13) minicore.

Then i chosed;
Board: minicore->ATmega328
Clock: internal 1MHZ
BOD: 1.8V
Arduino as ISP and Ctrl + shift + U
Then Blink works at 3.3v (but a little slow) but didn't work with 2.3v to the arduino.

Then;
Board: minicore->ATmega328
Clock: internal 1MHZ
BOD: 1.8V
Arduino as ISP and burn bootloader.

blink works well at 3.3v and 2,3v but now it gives an error when uploading new code to the arduino.I haven't made any other settings.

what is missing Is the minicore method wrong?

Thank you for your help.

[evb]

Ok, you programmed the blink sketch the first time via the ISP way of uploading

• the pro mini at 3.3V : works
• the pro mini at 2.3V : didn't do anything ==> this is already strange, it should also work

Then you did the same using the default way by uploading the sketch via the bootloader

• the pro mini at 3.3V : works
• the pro mini at 2.3V : works

And now you can't upload anymore new sketches to the pro mini.
Of course you upload your sketch with the pro mini again at 3.3V?

Further I should:

• double check your wirings
• is your programmer connected with fixed pinheaders or by folding the programmer a little in the holes of the pro mini? Verify if you have strong connections.
• Reprogram the bootloader. If this works, you should be able to upload a sketch.

Post some photo's that we can see something.

[emre299]

@evb
hello, yes, it gives an error while loading code right now (Pro mini 3.3v 1 mhz minicore bootloader).

i checked my cables 2 times. I already have a board for ISP code.!

Is there any detail picture you want? do you think the boot loader might be broken while writing

[evb]

@emre299 when you click on Burn Bootloader, you get these errors

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x03

So you verified the connections. Did you verify also with a multimeter? A wire can be broken internally

Do you have another pro mini to verify the connections?
I would try different settings like the normal settings 3.3V and 8Mzh externally, etc

If this does not work, I have no ideas anymore...