Dejan Petrović

I just saw I didn't connect PF0 and PF1 to the UPDI connector as an RX and TX

This is what I get: ``` avrdude: Short read, read only 0 out of 64 bytes avrdude: jtag3_edbg_recv(): Unexpected response 0x90 avrdude: retrying with external reset applied avrdude: jtag3_edbg_send(): Unexpected...

I cut the wrong RX/TX traces and rewire them. Error as above. I have no idea what this means, except I have to check my connections. Connections are good. Now....

OK. As far as I can see, it uses the UPDI line only. Another thing, I have to disable the reset. The easiest way is to use a Pro Mini,...

Tried 18pF and 8.2pF. Didn't work. I don't have the values you suggested. I think I will get them next week. For programming the bootloader, I use Arduino as ISP....

Ok, I tried 10pF and 15pF. With Arduino as ISP I ended the same as above. While using USBTiny I get this: ``` avrdude: Version 6.3-20201216 Copyright (c) 2000-2005 Brian...

This is from USBAsp: ``` avrdude: Version 6.3-20201216 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2014 Joerg Wunsch System wide configuration file is "C:\Users\dekip\AppData\Local\Arduino15\packages\MiniCore\hardware\avr\2.1.3/avrdude.conf" Using Port : usb Using...

That looks interesting...

Can you put some light on this 74hc04 IC? From what I can see it is Schmitt Trigger. According to the datasheet https://www.diodes.com/assets/Datasheets/74HC04.pdf, it seems to have 3 channels. In...

https://assets.nexperia.com/documents/data-sheet/74HC_HCT1G04.pdf This one? That makes things clear.