I have create a custom arduino board with an ATMega328pb and a FT232RL, I have flash optiboot bootloader with a programmer and now i want to programm it via USB but when i click on upload, nothing happend (avrdude: stk500_recv(): programmer is not responding)
I don't know why....
Did you use the Arduino's "burn bootloader", or some other procedure?
Are you using MCUDude's "miniCore"?
I don't see bypass caps on the atmega328b, nor the 2nd ground connection to pin 5...
Yes I use the arduino burn bootloader with Minicore !
I don't understand what you talk about... Bypass caps ? and pin 5 of atmega or ft232rl ?
I could be missing something but I don't see how VUSB gets to +5v.
Thats why I call them Search A Word circuts.
Well I tried to redo everything again:
- load the bootloader,
- send programm with programmer
- send program via usb
Everything works well !
On the other hand, as soon as I unplug the programmer from the arduino board, I can no longer send via usb
OK. Thanks. But that does not explain where +5v is derived. I would have expected something like
VUSB --> Schottky Diode --> +5v (or even a mosfet)
Yes no problem about that I have a Relay for selecting VUSB or +5V don't worry about that
OH MY GOD !
I'me veeeeerrrrryyyyy sorry... I check all my prototype, I have remove the 0.1uF from DTR on FT232RL so arduino IDE can't reset properly before uploading... My bad....
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